CN1906354A - Silicone composition and process useful for improving the coefficient of friction of an airbag, for protecting an occupant of a vehicle - Google Patents

Abstract

The invention relates to the general field of airbags. The invention more specifically relates to a method and composition enabling the friction of coated fabrics which are used in airbags to be increased by using a silicon composition comprising an additive made up of particles of a resin (III) comprising at least one (co)polyamide. After the composition has been coated on the fabric media and cross-linking has occurred, the coated media have optimum friction coefficient properties.

Description

Silicone composition and useful method for improving the coefficient of friction of an airbag for protecting a vehicle occupant

The general field of the invention is that of silicone coating compositions, especially those of the two-component or multi-component type, which allow the production of elastomers as thin layers cured by polyaddition or hydrosilylation reactions. These cured compositions are suitable, inter alia, as coatings, for example for the protection or mechanical reinforcement of various textile substrates, such as fibers, knits, knitting machines or nonwoven substrates.

Such silicone coatings are generally obtained by coating the substrate followed by curing due to polyaddition of unsaturated groups (alkenyl groups, e.g. Si-Vi) of the polyorganosiloxane to the same or Hydrogen on another polyorganosiloxane.

Currently, many motor vehicles are equipped with acceleration sensors that measure the deceleration of the vehicle. When the baseline deceleration value is exceeded, the explosive pellet triggers the combustion of the additional charge, which then triggers the combustion of the flammable solid; this solid converts to a gas (eg nitrogen) and expands the cushion. For further details of these personal protection airbags or "airbags" reference is made especially to French patent FR-A-2 668 106.

Historically, these airbags have been formed by a web of synthetic fibers, such as polyamide, coated on at least one face thereof with a layer of elastomer, such as neoprene rubber. The bladder (or inflatable cushion) is an inflatable bladder composed of pleated and tightly stitched polyamide fabric. Silicone compositions have readily replaced chloroprene rubber in this application since it was found that chloroprene rubber does not meet all of the above targeted specifications.

These silicone compositions have therefore found important use in the coating of flexible - woven, knitted or nonwoven - materials for the manufacture of personal protection airbags for vehicle occupants (known as "airbags").

Accordingly, the present invention relates to the use of silicones for the manufacture of such protective airbags.

Frontal airbags can be adaptive and deploy proportionally to the force of the impact. They can come with side airbags and curtains. The presence of such a protective coating or layer is dictated by the fact that the gas released by the gas generator in the event of an impact is extremely hot and contains hot particles that easily damage the Nylon(R) airbag.

The elastomeric inner protective layer must therefore be particularly resistant to high temperatures and mechanical stress. Equally important, this elastomeric coating is a thin, uniform film that is fully bonded to the synthetic fabric substrate forming the wall of the air bag. However, when the silicone deposition increased, an increase in the coefficient of friction, ie a decrease in the sliding properties of the airbag, was observed. Furthermore, when the silicone layer is on the outer surface of the airbag, it ensures the tightness of the airbag after deployment and inflation.

That is, these inflatable airbags must be made of fabrics with good sliding properties and a good coefficient of friction, so as not to delay the deployment of the airbags, while not compromising other intended properties, or even enhancing them, especially fire resistance, heat resistance , crease and abrasion resistance ("scrub test"), tear strength and carding strength. These good sliding properties are also desired for improved manual positioning of the airbag under the seating markers during the manufacture of the airbag, especially during the stitching and reinforcement operations in the area around the generator. Better sliding properties also make it possible to reduce the risk of injuring the occupant's face.

PRIOR ART EP-A-0 533 840 and US-5 296 298 describe silicone compositions for use in airbag applications. According to EP-A-0 553 840, these known silicone compositions include:

- (A) polydiorganosiloxanes containing at least two alkenyl groups per molecule,

- (B) polyorganohydrogensiloxanes containing in each molecule at least two hydrogen atoms attached to silicon,

- (C) metal catalysts of the platinum group,

- (D) adhesion promoters consisting of epoxy-functional organosilicon compounds,

- (E) mineral fillers, the amount by weight of which is defined relative to the amount of polyorganosiloxane (A),

- (F) resin polyorganosiloxane, and optionally

- (G) Compounds useful as curing inhibitors.

However, this reference only gives a solution to obtain a uniform and adhesive film for airbag coating and says nothing about solving the above-mentioned problems.

According to US-5 296 298, these silicone compositions include:

- (A) polydiorganosiloxanes containing at least two alkenyl groups per molecule,

- (B) polyorganohydrogensiloxanes containing in each molecule at least two hydrogen atoms attached to the silicone,

- (C) silanes containing methacrylic functional groups,

-(D) Epoxyalkoxysilane,

-(E) aluminum chelate, and

- (F) metal catalysts of the platinum group.

This reference provides a solution only to obtain a silicone film showing good adhesion on the airbag carrier. These compositions are not adapted to the new expectations of airbag manufacturers for controlling the sliding properties of the airbag.

Document EP-A-0 681 014 describes silicone compositions which can be used in particular as airbag linings and which have good properties for this purpose, especially for fire and heat resistance, mechanical properties, aging properties, adhesion and Adhesion to textile substrates is more particularly required in terms of surface uniformity. The solution suggested by said invention consists in using:

- Silicone coating compositions consisting of a mixture formed from the following components:

(1) at least one polyorganosiloxane containing per molecule at least two C ₂ -C ₆ alkenyl groups bonded to silicon,

(2) at least one polyorganosiloxane containing per molecule at least two hydrogen atoms attached to silicon,

(3) a catalytically effective amount of at least one catalyst consisting of a metal belonging to the platinum group,

(4) Adhesion promoters,

(5) Optionally, mineral fillers,

(6) optionally, at least one curing inhibitor, and

(7) Optionally, at least one polyorganosiloxane resin,

In this composition, the adhesion promoter consists only of at least a ternary combination of the following ingredients:

- (4-1) at least one alkoxylated organosiloxane containing at least one C ₂ -C ₆ alkenyl group per molecule,

- (4-2) at least one organosilicon compound comprising at least one epoxy group, and

-(4-3) at least one metal chelate M and/or a metal alkoxide of general formula M(OJ) _n , wherein n=valence state of M and J=linear or branched C ₁ -C ₈ alkyl ,

M is selected from: Ti, Zr, Ge, Li, Mn, Fe, Al and Mg.

The disadvantage of these formulations is that the elastomers obtained have a more or less tacky feel to the touch, which, in addition to being uncomfortable to handle, impairs the mechanical behavior and properties of the coated carrier. In the field of inflatable airbags for protecting vehicle occupants, an improvement would be particularly welcome in view of the fact that the deployability of the airbag depends inter alia on the value of the coefficient of friction.

These compositions are therefore not adapted to the new expectations of airbag manufacturers for controlling the sliding properties of the airbag.

French patent 2765884 describes silicone compositions comprising, as a mixture:

(1) at least one polyorganosiloxane containing per molecule at least two _C2 - _C6 alkenyl groups bonded to silicon,

(2) at least one polyorganosiloxane containing per molecule at least two hydrogen atoms attached to silicon,

(3) a catalytically effective amount of at least one catalyst consisting of at least one metal belonging to the platinum group,

(4) Adhesion promoters,

(5) Optionally, a reinforcing system, which may be at least one polyorganosiloxane resin and/or at least one reinforcing filler,

(6) optionally, at least one curing inhibitor, and

(7) Organic or inorganic hollow microspheres.

These expandable organic microspheres include polymeric walls containing liquids or gases. Expansion of these microspheres is induced by heating the polymer above the softening point and to a temperature sufficient to vaporize a liquid or appropriately expand a gas (which may be, for example, a paraffin such as isobutane or isopentane). The polymers used in its walls are from vinyl chloride, vinylidene chloride, acrylonitrile, methyl methacrylate or styrene monomers or from acrylonitrile/methacrylonitrile or acrylonitrile/vinylidene chloride prepared from copolymers.

However, the products obtained from compositions of this type after curing are foams, the mechanical properties of which, such as carding strength, are insufficient. It is therefore desirable to find alternatives to this type of composition.

The present invention seeks to overcome the deficiencies of the prior art.

In this respect, one of the main objectives of the present invention is to provide a method for improving the coefficient of friction of woven, knitted or nonwoven fibrous carriers. These carriers treated by the method according to the invention are especially useful for applications in the field of inflatable airbags or airbags for vehicles.

A second object of the present invention is to provide a silicone coating composition curable by polyaddition or free radical reaction, which is especially useful for applications in the field of inflatable airbags or airbags for vehicles, and which can be used in After curing and coating on fabric has the best properties in terms of slip properties, ie good coefficient of friction.

A third object of the present invention is to provide a curable silicone coating composition for airbags that is easy to use and apply and is also economical.

The final aim is to provide woven, knitted or nonwoven fiber carriers coated on one or both sides with the silicone elastomer according to the invention, the latter being particularly useful in the field of airbags.

More specifically, the present invention, with regard to the first subject, relates to a method for improving the coefficient of friction of a woven, knitted or nonwoven fibrous carrier, comprising the following steps:

A) the preparation of curable silicone coating composition (A), this composition comprises:

(1) Component (a-1) or (a-2):

- (a-1) corresponds to at least one polyorganosiloxane curable by the action of a catalyst based on at least one organic peroxide, and

-(a-2) corresponds to polyorganosiloxane blends curable by polyaddition, comprising:

- at least one polyorganosiloxane (I) containing at least two C ₂ -C ₆ alkenyl groups attached to silicon per molecule, and

- at least one polyorganosiloxane (II) containing at least two hydrogen atoms attached to silicon per molecule,

(2) An effective amount of a curing catalyst: when (a-1) is used, the catalyst consists of at least one organic peroxide, and when (a-2) is used, the catalyst consists of at least one metal of the platinum group (or compound) composition,

(3) particles of at least one resin (III) comprising at least one (co)polyamide,

(4) Optionally, at least one reinforcing filler,

(5) at least one adhesion promoter (IV),

(6) Optionally, the additive system (B), the components of which are added sequentially or simultaneously, consists of a mixture of the following components:

- at least one polyorganosiloxane resin (V) present in an amount of up to 60% by weight relative to the total weight of the mixture and optionally mixed with at least one polyorganosiloxane used as diluent, and

- calcium carbonate (CaCO ₃ ) present in an amount of up to 30% by weight relative to the total weight of the mixture;

(7) Optionally, at least one curing inhibitor (VI),

b) applying the silicone coating composition (A) prepared in step a) to one or both sides of a woven, knitted or nonwoven fibrous support in an amount of at least 10 g/m ² , and

c) curing the deposit formed in step b) by heating to a temperature which may be as high as 210° C. by electromagnetic radiation, especially by infrared radiation, to form an elastomer.

The presence of particles of resin (III) comprising at least one (co)polyamide has the effect of increasing the roughness of the coating, leading to a decrease in the coefficient of friction without impairing the mechanical properties of the fabric.

Preferably, the particles of resin (III) comprise at least one (co)polyamide selected from: polyamide-6, polyamide-6.6, polyamide-4, polyamide-11, polyamide-12, polyamide 4-6, 6-10, 6-12, 6-36 and 12-12, and their copolymers and blends.

According to a preferred embodiment, the particles of resin (III) comprise polyamide-12.

In another preferred mode, the particles of resin (III) have a spherical shape.

The (co)polyamide particles preferably have an average diameter between 5 and 100 μm and especially between 10 and 50 μm.

These particles are preferably present in a proportion of at most 40% by weight relative to the total weight of the mixture, preferably in a proportion between 1% and 30% by weight and even more preferably in a proportion between 5% and 20% by weight.

The polyorganosiloxanes (a1) curable by means of catalysts based on at least one organic peroxide are ideally products containing siloxy units of the formula:

in:

- the symbols R ¹ , which may be the same or different, denote a hydrocarbon radical containing 1 to 12 carbon atoms and preferably 1 to 8 carbon atoms, which is optionally substituted, and

-a is 1, 2 or 3.

Preferably, the symbol R is selected ^from :

- methyl, ethyl, propyl, butyl, hexyl and dodecyl,

- a cycloalkyl group, such as cyclohexyl,

- alkenyl groups such as vinyl, allyl, butenyl and hexenyl groups,

- aryl groups such as phenyl, tolyl and aralkyl groups such as β-phenylpropyl, and

- a group as above wherein one or more hydrogen atoms are replaced by one or more halogen atoms, cyano or cyano equivalents, eg chloromethyl, trifluoropropyl or cyanoethyl.

Even more preferably, the polyorganosiloxane (a-1) is terminated at the chain end by a trimethylsilyl group, a dimethylvinyl group, a dimethylhydroxysilyl group or a trivinylsilyl group.

In a particularly advantageous embodiment, the polyorganosiloxane (a-1) contains at least two alkenyl groups per molecule.

Among the organic peroxides usable in the present invention, mention may be made of benzoyl peroxide, bis(p-chlorobenzoyl)peroxide, bis(2,4-dichlorobenzoyl)peroxide, Dicumyl peroxide, di-tert-butyl peroxide, 2,5-dimethyl-2,5-bis(tert-butylperoxy)hexane, tert-butyl perbenzoate, tert-butyl cumyl peroxide Oxides, halogenated derivatives of the above peroxides, such as bis(2,4-dichlorobenzoyl)peroxide, 1,6-bis(p-toluoyl-peroxycarbonyloxy)hexyl alkane, 1,6-bis(benzoylperoxycarbonyloxy)hexane, 1,6-bis(p-toluoyl-peroxycarbonyloxy)butane and 1,6-bis(2 , 4-Dimethylbenzoylperoxycarbonyloxy)hexane.

The polyorganosiloxane (I) used in the silicone coating composition (A) in the curing mode using polyaddition reaction includes:

(i) Siloxy units of the general formula:

in:

- the symbol ^R represents alkenyl, preferably vinyl or allyl,

- The symbol Z, which may be the same or different, each represents a monovalent hydrocarbon group selected from alkyl groups containing 1 to 8 carbon atoms (inclusive) and from aryl groups that has no adverse effect on the activity of the catalyst group, the alkyl group is optionally substituted by at least one halogen atom,

- a is 1 or 2, b is 0, 1 or 2 and the sum of a+b is equal to 1, 2 or 3, and optionally (ii) other siloxy units of the general formula:

In the formula:

-Z has the same meaning as above and c is 0, 1, 2 or 3.

The polydiorganosiloxane (I) may have a viscosity at least equal to 200 mPa.s and preferably lower than 200,000 mPa.s.

All viscosities referred to in this description correspond to dynamic viscosity amplitudes measured in a manner known per se at 25°C.

The polyorganosiloxane (I) may be formed solely from units of the general formula (I-1) or may additionally contain units of the general formula (I-2). Similarly, it can have a linear, branched, cyclic or network structure. Z is generally selected from methyl, ethyl and phenyl, with at least 60 mole percent (or by number) of the groups Z being methyl. Examples of siloxy units of the general formula (I-1) are vinyldimethylsiloxy, vinylphenylmethylsiloxy, vinylmethylsiloxy and vinylsiloxy units.

Examples of siloxy units of the general formula (I-2) are the units SiO _4/2 , dimethylsiloxy, methylphenylsiloxy, diphenylsiloxy, methylsiloxy and phenyl base siloxyl. Examples of polyorganosiloxanes (I) are linear and cyclic compounds, for example: dimethylpolysiloxane with dimethylvinylsilyl end groups, trimethylsilyl end group ( Methylvinyl)(dimethyl)polysiloxane copolymers, (methylvinyl)(dimethyl)polysiloxane copolymers containing dimethylvinylsilyl end groups and cyclic methyl vinyl polysiloxane.

Ideally, the polyorganosiloxane (II) comprises siloxy units of the general formula:

In the formula:

- groups L, which may be the same or different, each representing a monovalent hydrocarbon group which does not adversely affect the activity of the catalyst, preferably selected from alkyl groups (optionally selected from 1 to 8 carbon atoms inclusive) containing substituted by at least one halogen atom), advantageously selected from methyl, ethyl, propyl and 3,3,3-trifluoropropyl groups, and aryl, advantageously dimethylphenyl, tolyl or benzene base,

-d is 1 or 2, e is 0, 1 or 2, the sum of d+e equals 1, 2 or 3, and

- optionally, at least some of the other units are units of the average general formula:

wherein the group L has the same meaning as above and g is equal to 0, 1, 2 or 3.

The polyorganosiloxane (II) has a dynamic viscosity at least equal to 10 mPa.s and preferably between 20 and 1000 mPa.s. The polyorganosiloxane (II) may be formed solely from units of the general formula (II-1) or may additionally contain units of the general formula (II-2). The polyorganosiloxane (II) may have a linear, branched, cyclic or network structure. The group L has the same meanings as the group Z above. Examples of units of the general formula (II-1) are H(CH ₃ ) ₂ SiO _1/2 , HCH ₃ SiO _2/2 and H(C ₆ H ₅ )SiO _2/2 .

Examples of the unit of general formula (II-2) are the same as those given above for the unit of general formula (I-2).

Examples of polyorganosiloxanes (II) are linear and cyclic compounds such as:

- dimethicones containing hydrodimethylsilyl end groups,

- copolymers containing (dimethyl)(hydrogenmethyl)polysiloxane units containing trimethylsilyl end groups,

- copolymers containing (dimethyl)(hydrogenmethyl)polysiloxane units containing hydrodimethylsilyl end groups,

- hydromethylpolysiloxanes containing trimethylsilyl end groups,

- Cyclic hydromethyl polysiloxanes.

Compound (II) may optionally be a mixture of a dimethylpolysiloxane containing hydrodimethylsilyl end groups and a polyorganosiloxane containing at least three hydrosiloxy groups.

The ratio of the number of hydrogen atoms attached to silicon in polyorgano-siloxane (II) to the total number of groups containing alkenyl unsaturated bonds in polyorganosiloxane (I) is between 0.4 and between 10 and preferably between 0.6 and 5.

The base of silicone polyaddition compositions may comprise only linear polyorganosiloxanes (I) and (II), such as those described in the following patents: US-A-3 220 972, US-A- 3697 473 and US-A-4 340 709 or may simultaneously include branched or network polyorganosiloxanes (I) and (II), such as those described in the following patents: US-A-3 284 406 and US-A-3 284 406 and US-A- A-3 434366.

According to a particular embodiment, the following components are used:

- at least one linear polyorganosiloxane (I) comprising a chain formed from units of general formula (I-2) (wherein c=2), each of which is terminated by a unit of general formula (I-1) closed, where a=1 and b=2, and

- at least one linear polyorganosiloxane (II) comprising in its structure at least 3 hydrogen atoms attached to silicon, in chains and/or at chain ends;

and even more specifically:

- at least one linear polyorganosiloxane (I) comprising a chain formed from units of general formula (I-2) (wherein c=2), each of which is terminated by a unit of general formula (I-1) closed, where a=1 and b=2, and

- comprising at least one of chains formed from units of general formula (II-1) (where d=1 and e=1) and optionally units of general formula (II-2) (where g=2) Linear polyorganosiloxanes (I) blocked at each of their ends by units of the general formula (II-1) (where d=1 and e=2).

When (a-2) is used, the curing catalyst consists of at least one metal (or compound) of the platinum group, which are also well known. The metals of the platinum group are those known under the name platinoids, a term that, in addition to platinum, also takes into account ruthenium, rhodium, palladium, osmium and iridium. Preference is given to using platinum and rhodium compounds. Specifically can use described in patent US-A-3 159 601, US-A-3 159 602, US-A-3 220 972 and European patent EP-A-0057 459, EP-A-0 188 978 and EP - Complexes of platinum and organic products in A-0 190 530, and described in patents US-A-3 419 593, US-A-3 715 334, US-A-3 377432 and US-A-3 814 730 Platinum and vinyl organosiloxane complexes. A generally preferred catalyst is platinum. In this case, the catalyst (III) is generally used in an amount by weight of between 2 and 400 ppm, preferably between 5 and 200 ppm, based on the weight of the platinum group metal, based on the polyorganosiloxanes (I) and (II ) of the total weight.

The presence of the additive system (B) in the silicone coating composition (A) of the invention makes it possible to control the carding and tearing strength of the woven, knitted or nonwoven fibrous support. In order to be used in system (B), calcium carbonate does not need to undergo compatibilization treatment (by heating or surface treatment) and therefore cannot be compared to a simple semi-reinforcing filler.

Resin (V) preferably includes at least one alkenyl residue in its structure. According to a preferred mode, the polyorganosiloxane resin (V) comprises siloxy units Q of the general formula SiO _4/2 .

According to another particular mode, the polyorganosiloxane resin (V) comprises 0.1% to 20% by weight of alkenyl groups in its structure, preferably more than 4% by weight, the structure containing siloxy units of type T, which may be the same or different, and siloxy units of type T, which may be the same or different, and/or siloxy units of type Q and optionally D.

In a particularly preferred manner, the polyorganosiloxane resin (V) comprises at least 2% by weight and preferably at least 5% by weight of siloxy units of type Q.

These resins (V) are well known and commercially available branched organopolysiloxane oligomers or polymers. They are in the form of solutions, preferably silicone solutions. They have in their structure at least two different ones selected from those of the general formula R ₃ SiO _0.5 (unit M), R ₂ SiO (unit D), RSiO _1.5 (unit T) and SiO ₂ (unit Q). units, at least one of which is a T or Q unit.

The radicals R are identical or different and are selected from linear or branched C ₁ -C ₆ alkyl, C ₂ -C ₄ alkenyl groups, phenyl, 3,3,3-trifluoropropyl and hydroxyl . For example there may be mentioned: as alkyl R, methyl, ethyl, isopropyl, tert-butyl and n-hexyl, and as alkenyl R, vinyl.

It will be appreciated that in resins (V) of the type described above some of the groups R are alkenyl groups.

As examples of branched organopolysiloxane oligomers or polymers, mention may be made of resins MQ, resins MDQ, resins TD and resins MDT, the alkenyl functionality possibly carried by units M, D and/or T . As examples of particularly suitable resins, mention may be made of vinyl MDQ resins having a vinyl weight content between 0.2% and 10% by weight.

When the curable silicone coating composition (A) according to the invention comprises a reinforcing filler, it may be silica having a BET specific surface area of at least 50 m ² /g. The filler is desirably processed by treatment with various organosilicon compounds commonly used for this purpose. Thus, these organosilicon compounds may be organochlorosilanes, diorganocyclopolysiloxanes, hexaorganodisiloxanes, hexaorganodisilazanes or diorganocyclopolysilazanes (French patent FR -A-1126 884, FR-A-1 136 885 and FR-A-1 236 505, and British Patent GB-A-1 024234).

The curable silicone coating composition (A) according to the invention may also comprise standard semi-reinforcing or filling fillers, such as diatomaceous earth or quartz powder.

May include other non-siliceous minerals, as semi-reinforcing or filling mineral fillers: carbon black, titanium dioxide, alumina, hydrated alumina, expanded vermiculite, non-expanded vermiculite, compatibilized calcium carbonate, zinc oxide, mica , talc, iron oxide, barium sulfate, slaked lime, etc.

These fillers are present in proportions of 5% to 30% and preferably 15% to 25% for reinforcing fillers and 5% to 40% and preferably 10% to 30% for semi-reinforcing or filling fillers, relative to the total composition.

Without limitation, the adhesion promoter (IV) may only include:

- (IV.1) at least one alkoxyorganosilane containing at least one C ₂ -C ₆ alkenyl group per molecule,

- (IV.2) at least one organosilicon compound comprising at least one epoxy group, and

- (IV.3) at least one metal chelate M and/or a metal alkoxide of the general formula M(OJ) _n , where n=valence of M and J=linear or branched C ₁ -C ₈ alkyl ,

M is selected from: Ti, Zr, Ge, Li, Mn, Fe, Al and Mg.

According to a preferred arrangement of the invention, the alkoxyorganosilane (IV.1) of the accelerator (IV) is selected from products having the formula:

In this general formula:

- R ¹ , R ² and R ³ are identical or different hydrogenated or hydrocarbon-type groups and represent hydrogen, linear or branched C ₁ -C ₄ alkyl or optionally replaced by at least one C ₁ -C ₃ alkyl Substituted phenyl,

-U is linear or branched C ₁ -C ₄ alkylene,

-W is the valence key,

^-R4 and ^R5 are the same or different groups and represent linear or branched _C1 - _C4alkyl ,

- x' = 0 or 1, and

-x=0 to 2.

Without limitation, it is believed that the vinyltrimethoxysilane is a particularly suitable compound (IV.1).

With regard to the organosilicon compound (IV.2), it is envisaged according to the invention that it is selected from:

a) corresponding to the product (IV.2a) of the following general formula:

In this general formula:

-R ⁶ is linear or branched C ₁ -C ₄ alkyl,

-R ⁷ is linear or branched alkyl,

-y is equal to 0, 1, 2 or 3, and

-X is defined by the following general formula:

in:

-E and D, are the same or different groups selected from linear or branched C ₁ -C ₄ alkyl groups,

-z, which is equal to 0 or 1,

- R ⁸ , R ⁹ and R ¹⁰ , are the same or different groups representing hydrogen or linear or branched C ₁ -C ₄ alkyl, and

- or R ⁸ and R ⁹ or R ¹⁰ may together form a 5- to 7-membered alkyl ring together with the two carbons carrying the epoxy group,

b) or products (IV.2b) selected from the group consisting of epoxy-functional polydiorganosiloxanes including:

(i) at least one siloxy unit of the formula:

In this general formula:

-X is the group defined above for general formula (IV.2a)

-G has no adverse effect on the activity of the catalyst and is selected from monovalent hydrocarbon groups containing 1 to 8 carbon atoms (inclusive) and aryl groups, which are optionally replaced by at least one Halogen atom substitution,

-p=1 or 2,

-q=0, 1 or 2,

-p+q=1, 2 or 3, and

(2i) Optional at least one siloxy unit of the formula:

In this general formula G has the same meaning as above and r is equal to 0, 1, 2 or 3.

For the last compound (IV.3) of the adhesion promoter (IV) of the silicone composition (EVF) according to the invention, preferred compounds are the metal M of the chelate and/or alkoxide (IV.3) therein Products selected from the following list: Ti, Zr, Ge, Li or Mn. It should be pointed out that titanium is more particularly preferred. For example, it may be combined with an alkoxy group such as butoxy.

The adhesion promoter (IV) may be formed from:

-(IV.1) Alone

-(IV.2) Alone

-(IV.1)+(IV.2)

According to two preferred embodiments:

-(IV.1)×(IV.3)

-(IV.2)×(IV.3)

And finally, according to the most preferred embodiment: (IV.1)+(IV.2)+(IV.3).

According to the invention, the ideal combination to form an adhesion promoter is as follows:

- vinyltrimethoxysilane (VTMO) represented by general formula (IV.1),

- 3-glycidoxypropyltrimethoxysilane (GLYMO) represented by general formula (IV.2), and

-Butyl titanate represented by the general formula (IV.3).

In terms of quantity, it can be noted that, expressed in weight percentages relative to the total amount of the three components, the weight ratio between (IV.1), (IV.2) and (IV.3) is as follows:

- (IV.1) > 10, preferably between 15 and 70 and even more preferably between 25 and 65,

- (IV.2) ≤ 90, preferably between 70 and 15 and even more preferably between 65 and 25, knowing

- (IV.3) > 1, preferably between 5 and 25 and even more preferably between 8 and 18,

It should be understood that the sum of the proportions of (IV.1), (IV.2) and (IV.3) equals 100%.

For better adhesive properties, the weight ratio (IV.2):(IV.1) is preferably between 2:1 and 0.5:1, a ratio of 1:1 being very particularly preferred.

Advantageously, the adhesion promoter (IV) is present in an amount of 0.1% to 10%, preferably 0.5% to 5% and even more preferably 1% to 3% ( weight) ratio exists.

According to a preferred embodiment, the curable silicone coating composition (A) used in the method according to the invention comprises a mixture formed from the following components:

(1) at least one polyorganosiloxane (I) containing per molecule at least two C ₂ -C ₆ alkenyl groups bonded to silicon,

(2) at least one polyorganosiloxane (II) containing at least two hydrogen atoms attached to silicon per molecule,

(3) a catalytically effective amount of at least one catalyst consisting of at least one metal belonging to the platinum group,

(4) at least one adhesion promoter (IV),

(5) particles of at least one resin (III) comprising at least one (co)polyamide,

(6) Additive system (B), the components of which are added to the mixture sequentially or simultaneously, consisting of a mixture of the following components:

- at least one polyorganosiloxane resin (V) present in an amount of up to 60% by weight relative to the total weight of the mixture and optionally mixed with at least one polyorganosiloxane used as diluent, and

- calcium carbonate (CaCO ₃ ) present in an amount of up to 30% by weight relative to the total weight of the mixture;

(7) Optionally, at least one reinforcing filler,

(8) Optionally, at least one curing inhibitor (VI),

(9) optionally, at least one coloring additive (VII), and

(10) Optionally, at least one additive (VIII) for improving fire resistance.

The curing inhibitor (VI) may be selected from the following compounds:

- polyorganosiloxanes substituted by at least one alkenyl group (which may optionally be in cyclic form), tetramethylvinyltetrasiloxane being particularly preferred,

-pyridine,

- organic phosphines and phosphites,

- unsaturated amides,

- Alkyl maleate, and

-Alkynol.

These acetylenic alcohols (see FR-B-1 528 464 and FR-A-2 372 874), which belong to the preferred hydrosilylation-reaction thermal blockers, have the following general formula:

(R')(R")C(OH)-C≡CH

In this general formula:

-R' is linear or branched alkyl, or phenyl;

- R" is H or a linear or branched alkyl group, or phenyl; the group R' and R" and the carbon atom alpha to the triple bond may form a ring;

The total number of carbon atoms contained in R' and R" is at least 5 and preferably 9-20.

For this alcohol, examples that may be mentioned include:

-1-ethynyl-1-cyclohexanol;

-3-methyl-1-dodeyn-3-ol;

-3,7,11-trimethyl-1-dodeyn-3-ol;

-1,1-diphenyl-2-propyn-1-ol;

-3-Ethyl-6-ethyl-1-nonyn-3-ol;

-2-methyl-3-butyn-2-ol;

-3-methyl-1-pentadeyn-3-ol;

- diallyl maleate or diallyl maleate derivatives.

These α-alkynols are commercially available products.

Such retarders (VI) are present in proportions of up to 3000 ppm and preferably in proportions of from 100 to 1000 ppm, relative to the total weight of organopolysiloxanes (I) and (II).

As the fire resistance-improving additive (VIII), examples that may be mentioned include compounds containing a phenyl group substituted by an amino (secondary or tertiary) group. Examples of such additives can be found in reference US 5 516 938. Such additives are generally used in an amount of 0.01-1 part by weight relative to the total amount of the composition.

In a manner known per se, the curable silicone coating compositions (A) according to the invention can be supplemented with various customary additives, such as dyes.

The present invention also relates to a curable silicone coating composition (A) as described above for use in the method according to the invention.

According to another aspect of the present invention, the present invention relates to a two-component or multi-component precursor system (C) for a curable silicone coating composition (A) as described above. Such precursor systems comprise at least two separate parts A and B which need to be mixed together to form the composition, one of these A or B parts comprising the catalyst and only one polyorganosiloxane species (I) or (II).

Another feature of this precursor system when using accelerator systems (IV-1), (IV-2) and (IV-3) is that its part A or Part A or B of compound (IV-3) without promoter (IV) and its compound (IV-1 ) including promoter (IV) does not include catalyst (III).

The viscosity of parts A and B and their intermixtures can be adjusted by varying the amounts of ingredients and by selecting polyorganosiloxanes of different viscosities.

Once mixed together, the parts A and B form a ready-to-use silicone composition which can be applied to the support by any suitable means of application, such as by a doctor blade or roller. A general target for the final deposited thickness after curing is between 25 and 300 μm and especially between 50 and 200 μm. It is not necessary to have a uniform thickness since, if the surface of the support is not regular, irregular deposition may result.

The compositions according to the invention cure thermally and/or by electromagnetic radiation (radiation of accelerated electrons or "electron beams").

The composition according to the invention can be used for covering or coating flexible supports, especially woven, knitted or non-woven fiber textiles, and preferably woven, knitted or non-woven fabrics made of synthetic fibers, ideally made of polyester or polyamide or non-woven fabric carrier.

The invention also relates to a woven, knitted or nonwoven fibrous carrier coated with an elastomer on one or both sides, obtainable by:

a) - Apply at least 10 g/m ² of the silicone coating composition (A) as described above or a silicone coating composition (A) as described above or one of the two Component or the resulting composition of parts A and B of the multi-component system (B), and

- forming an elastomer by curing the deposit formed in the preceding step by heating to a temperature which may be as high as 210°C by electromagnetic radiation or infrared radiation, or

b) Using the method according to the invention as described above.

Another aspect of the invention relates to an inflatable airbag for protecting a vehicle occupant formed from a carrier coated according to the procedure of the invention as described above.

The present invention also relates to the use of the two-component or multi-component systems (B) according to the invention, the curable silicone coating compositions (A) according to the invention for coating woven, knitted or nonwoven fibrous supports. Preferably, these carriers are intended to form inflatable airbags for protecting vehicle occupants. In a preferred embodiment, the support is a fabric with an open context, a porosity according to ISO standard 9237 >10 l/dm ² /min.

A covering or coating of at least one side of a flexible carrier material, in particular a textile such as a polyamide fabric, can be used for the production of technical fabrics, such as, inter alia, inflatable airbags for the personal protection of vehicle occupants when subjected to impacts, Tent webs, parachute webs and more.

Here, the composition or the method according to the invention was found to be interesting not only for the coating of supports normally used for the manufacture of inflatable balloons, but also for the coating of supports with unobstructed tissues. The term "support with unobstructed texture" means, according to ISO standard 9237, a support with a porosity >10 l/dm ² /min. For fabrics, open weave may especially be defined as corresponding to the number of warp and weft threads per centimeter, the sum of which is less than or equal to 36.

As fabrics which are particularly recommended in the context of the present invention, mention may generally be made of fabrics having a weight without coating of less than 200 g/m ² and in particular less than or equal to 160 g/m ² . Mention may thus be made of such fabrics having 16×16 to 18×18 threads/cm, especially polyamide fabrics, for example fabrics of 470 dtex (decitex) having these properties.

It should be pointed out that it is also possible to use substrates, in particular fabrics, formed of technical textile fibers, i.e. textile fibers whose properties have been improved compared to standard fibers (for example increased fastness), in order to impart Special properties enhanced by the application.

A subject of the invention is therefore also a flexible carrier, in particular a textile carrier coated according to the invention and thus having the properties and properties described above.

By virtue of the properties and characteristics described above, inflatable airbags for the personal protection of vehicle occupants can be manufactured from fabrics as described above, especially polyamide or polyester fabrics, which once applied have good coefficient of friction, good carding and tear strength and additionally best properties, especially in terms of impermeability, heat protection, porosity, flexibility and fire resistance. This makes it possible to produce inflatable airbags which have a better quality of properties and which are cheaper than airbags manufactured from prior art coated fabrics. Thus for a comparable weight it is possible to increase the thickness of the coating without compromising the coefficient of friction. In general, the coating referred to here can correspond to the deposition of a single layer on at least one side of the flexible carrier material (first coating). However, it can also involve the deposition of a second or optional third layer on at least one face of an already applied carrier material (secondary coat) so as to have the overall desired thickness, which ensures impermeability Possibly optimized property qualities in terms of sexual and comfortable sensory properties.

The following examples concerning the preparation of compositions according to the process of the invention and their use as coatings for polyamide fabrics will allow the invention to be understood more clearly and make it possible to emphasize its advantages and embodiment variants. The characteristic qualities of the products obtained by the process according to the invention will be illustrated using comparative experiments.

Example

In these examples, viscosity was measured using a Brookfield viscometer according to the instructions of AFNOR Standard NFT-76-106, May 1982.

Example 1:

1) Definition of ingredients:

- Polyorganosiloxane (I): polydimethylsiloxane oil blocked by (CH ₃ ) ₂ ViSiO _0.5 units at each end of the chain, which has a viscosity of 100 000 mPa.s and contains 0.003 Si-Vi functional groups /100g of oil [this component is hereinafter referred to as oil (I)];

- polyorganosiloxane, hereinafter called diluent (A): polydimethylsiloxane oil blocked at each end of the chain by (CH ₃ ) ₂ ViSiO _0.5 units, having a viscosity of 60 000 mPa.s;

- polyorganosiloxane (II): poly(dimethyl)(hydrogenmethyl)siloxane oil blocked at each end of the chain by (CH ₃ ) ₂ HSiO _0.5 units, having a viscosity of 25 mPa.s and an oil containing a total of 0.7 Si-H functional groups per 100 g (including 0.6 Si-H functional groups located in the chain) [this component is hereinafter referred to as oil (II)];

- Catalyst: Pt metal, which is introduced as an organometallic complex containing 10% by weight of Pt metal, known under the name Karstedt catalyst [this component is hereinafter referred to as catalyst];

- Ethynylcyclohexanol 1 (ECH inhibitor);

- Adhesion promoter (IV), a mixture consisting of:

- (IV-1) vinyltrimethoxysilane (VTMO),

- (IV-2) glycidoxypropyltrimethoxysilane (GLYMO), and

- (IV-3) tetrabutyl titanate Ti(OBu) ₄ (TBT);

- Resin (V): polyorganosiloxane of general formula MM ^V1 DD ^V1 Q, containing 0.8% by weight of vinyl groups (Vi) and composed of 27% by weight of (CH ₃ ) ₃ SiO _0.5 units , 0.15 wt% (CH ₃ ) ₂ ViSiO _0.5 units, 60 wt% (CH ₃ ) ₂ SiO units, 2.4 wt% (CH ₃ )ViSiO units and 9.6 wt% SiO ₂ units and The remaining OH group composition;

- calcium carbonate, CaCO ₃ (Albacar(R) 5970), which has not undergone compatibilization treatment (heating or surface functionalization);

- Orgasol(R) 2002 ES3 NAT3 (company: Atofina), polyamide - 12 grains, average particle size: 30 μm.

2) Process and results:

a) Compositions prepared from two-component precursors:

- A control composition (C-1 ) is obtained by mixing together 100 parts by weight of part A and 10 parts by weight of part B of a two-component system at room temperature (see composition in Table 1).

- The composition (I-1) according to the invention is obtained by mixing together the following components at room temperature:

125 parts by weight of part A-1 obtained by mixing 100 parts by weight of part A of composition C-1 with 25 parts by weight of Orgasol(R) 2002 ES3 NAT3 granules, and

- 10 parts by weight of composition B-1 having the same composition as part B of composition C-1

b) Each of the mixtures (C-1 and I-1) was applied on a desized type 6.6 polyhexamethylene adipamide fabric with a yarn count of 235 decitex (dtex) using a doctor blade or an applicator roller apply (variable application rate, expressed in g/ ^m2 ) to form deposits, and

c) The resulting layer is cured in a Mathis oven at 180° C. for 80 seconds to obtain an elastomer. The results of the comparative tests are given in Tables II to IV.

The measurement of the coefficient of friction (Ks) is carried out according to standard NFQ 03-082. Table II shows the results of measurements of the coefficient of friction obtained by rubbing on glass plates. Table III shows the coefficient of friction measurements obtained by rubbing a sample of the coated fabric on itself, with the coated surface facing the coated surface.

Table I combination C-1

Part A parts by weight Composition containing 40 wt% resin (V) and 60 wt% diluent (A) 48 Ethynyl cyclohexanol 1 0.025 High viscosity oil (I) 28 CaCO ₃ 16 Oil (II) 6 VTMO 1 GLYMO 1

Part B Composition containing 40 wt% resin (V) and 60 wt% diluent (A) 45 High viscosity oil (I) 51 TBT 4 catalyst 0.02

Table II C-1 I-1 Deposit amount (g/m ² ) Friction coefficient (Ks) Deposit amount (g/m ² ) Friction coefficient (Ks) twenty three 0.27 27 0.29 26 0.27 33 0.3 35 0.82 37 0.33 37 1.00 43 0.33 43 1.75

Table III C-1 I-1 Deposit amount (g/m ² ) Friction coefficient (Ks) Deposit amount (g/m ² ) Friction coefficient (Ks) 27 0.31 36 0.37 33 0.41 40 1.00 37 0.38 41 0.91 43 0.59

It has been found that the composition I-1 according to the invention leads to lower coefficients of friction than those obtained with the control composition C-1 when the deposits are comparable in terms of the amount of coated fabric per unit area ( COF).

Next, samples of the coated fabric were tested according to standard methods in the prior art of airbag manufacture. The results are listed in Table IV below.

The test for wrinkle resistance and abrasion resistance (the "scrub" test) (ISO standard 5981 A) reflects the adhesive and aging behavior of the composition. The test consists in firstly subjecting the fabric to a shearing movement and secondly to abrasion by contact with a moving carrier by using two grippers clamping two opposite edges of the sample and driven in reciprocating motion relative to each other.

Table IV Test method unit of measurement C-1 I-1 viscosity Brookfield mPa.s 47 000 105 000 Combing Strength DIN 54301 Newton (N) 33g/ ^m2 526 27g/ ^m2 730 36g/ ^m2 742 33g/ ^m2 770 41g/ ^m2 845 33g/ ^m2 784 37g/ ^m2 795 43g/ ^m2 844 tear strength ISO 13937 Newton (N) 33g/ ^m2 142 27g/ ^m2 119 36g/ ^m2 140 33g/ ^m2 132 41g/ ^m2 149 33g/ ^m2 127 37g/ ^m2 142 43g/ ^m2 123 "Scrubbing" test ISO 5981 A Number of frictions 33g/ ^m2 >1000 27g/m ² l 1000 36g/ ^m2 >1000 33g/ ^m2 1000 41g/ ^m2 >1000 33g/m ² l 1200 37g/ ^m2 1000 43g/ ^m2 1200 fire resistance ISO 3795mm/min 23g/ ^m2 59 27g/ ^m2 self extinguishing 35g/ ^m2 self extinguishing 33g/ ^m2 self extinguishing 43g/ ^m2 self extinguishing 43g/ ^m2 self extinguishing

It was thus found that, for an equivalent amount of coating deposition, the general formula I-1 makes it possible to maintain the performance properties of the fabric obtained with the general formula C-1 while enhancing the coefficient of friction.

Claims (27)

1. improve the method for the coefficient of friction of braiding, knitting or non-woven fabric fiber carrier, comprise the following steps:

A) preparation of curable silicone coating composition (A), said composition comprises:

(I) component (a-1) or (a-2):

-at least a the polysiloxane that (a-1) is cured corresponding to the effect that can utilize based on the catalyst of at least a organic peroxide and

-(a-2) corresponding to comprising by the polysiloxane blend of sudden reaction curing:

-per molecule contains at least two C that are connected on the silicon ₂-C ₆At least a polysiloxane (I) of alkenyl group and

-per molecule contains at least a polysiloxane (II) of at least two hydrogen atoms that are connected on the silicon,

(2) curing catalysts of effective dose: when using (a-1), this catalyst is made up of at least a organic peroxide, and when using (a-2), this catalyst is made up of at least a metal (or compound) of platinum family,

(3) comprise the particle of at least a resin (III) of at least a (being total to) polyamide,

(4) randomly, at least a reinforcer,

(5) at least a adhesion promotor (IV),

(6) randomly, additive system (B), its each composition add in order or simultaneously, are made up of the mixture of following component:

-at least a polysiloxane resin (V), it exist with amount with respect to the 60wt% at the most of mixture total weight amount and randomly mix with at least a polysiloxane as diluent and

-calcium carbonate (the CaCO that exists with amount with respect to the 30wt% at the most of the gross weight of mixture ₃);

(7) randomly, at least a curing inhibitors (VI),

B) with the silicone paint composition (A) for preparing in the step a) with 10g/m at least ²Amount be applied on one or two face of braiding, knitting or non-woven fabric fiber carrier and

C) arrive and up to 210 ℃ temperature the deposit that forms in the step b) to be solidify to form elastomer by electromagnetic radiation or by infrared radiation heating.

2. according to the method for the coefficient of friction of the improvement of claim 1 braiding, knitting or non-woven fabric fiber carrier, wherein curable silicone coating composition (A) comprises the mixture that is formed by following ingredients:

(1) per molecule contains at least two C that are connected on the silicon ₂-C ₆At least a polysiloxane (I) of alkenyl group,

(2) per molecule contains at least a polysiloxane (II) of at least two hydrogen atoms that are connected on the silicon,

(3) at least a catalyst formed of at least a metal by belonging to platinum family of catalytically effective amount,

(4) at least a adhesion promotor (IV),

(5) comprise the particle of at least a resin (III) of at least a (being total to) polyamide,

(6) additive system (B), its each composition add in order or simultaneously, are made up of the mixture of following ingredients:

-at least a polysiloxane resin (V), it exist with amount with respect to the 60wt% at the most of mixture total weight amount and randomly mix with at least a polysiloxane as diluent and

-calcium carbonate (the CaCO that exists with amount with respect to the 30wt% at the most of the gross weight of mixture ₃);

(7) randomly, at least a reinforcer,

(8) randomly, at least a curing inhibitors (VI),

(9) randomly, at least a color additive (VII) and

(10) randomly, be used to improve at least a additive (VIII) of fire resistance.

3. according to the method for the coefficient of friction of any one improvement braiding, knitting or non-woven fabric fiber carrier in the claim of front, wherein the particle of resin (III) has sphere.

4. according to the method for the coefficient of friction of the improvement of claim 3 braiding, knitting or non-woven fabric fiber carrier, wherein the average diameter of the particle of resin (III) is between 5 and 100 μ m.

5. according to one the method for coefficient of friction of improvement braiding, knitting or non-woven fabric fiber carrier in the aforementioned claim, wherein the particle of resin (III) comprises at least a (being total to) polyamide, is selected from: polyamide-6, polyamide-6.6, polyamide-4, polyamide-11, polyamide-12, polyamide 4-6,6-10,6-12,6-36 and 12-12, and their copolymer and blend.

6. according to the method for the coefficient of friction of the improvement of claim 5 braiding, knitting or non-woven fabric fiber carrier, wherein the particle of resin (III) comprises polyamide-12.

7. according to one the method for coefficient of friction of improvement braiding, knitting or non-woven fabric fiber carrier in the aforementioned claim, wherein the particle of resin (III) is with 40wt% at the most, preferably with the ratio of 1%-30% (weight) and even more preferably exist with the ratio of 5%-20% (weight), with respect to the gross weight of mixture.

8. according to one the method for coefficient of friction of improvement braiding, knitting or non-woven fabric fiber carrier in the aforementioned claim, wherein the adhesion promotor (IV) of curable silicone coating composition (A) only comprises:

-(IV.1) per molecule contains at least one C ₂-C ₆At least a alkoxyorganosilane of alkenyl group,

-(IV.2) comprise at least one epoxy radicals at least a organo-silicon compound and

-(IV.3) at least a metallo-chelate M and/or formula M (OJ) _nMetal alkoxide, the linear or branching C of the valence state of n=M and J=wherein ₁-C ₈Alkyl,

M is selected from: Ti, Zr, Ge, Li, Mn, Fe, Al and Mg.

9. the method for the coefficient of friction of improvement braiding according to Claim 8, knitting or non-woven fabric fiber carrier, wherein the alkoxyl organosiloxane (IV.1) of promoter (IV) is corresponding to following general formula:

In this general formula:

-R ¹, R ²And R ³Be the group of identical or different hydrogenation or hydrocarbon type and represent hydrogen, linear or branching C ₁-C ₄Alkyl or optional by at least one C ₁-C ₃The phenyl that alkyl replaces,

-U is linear or branching C ₁-C ₄Alkylidene,

-W is a valence link,

-R ⁴And R ⁵Be identical or different groups and represent linear or branching C ₁-C ₄Alkyl,

-x '=0 or 1 and

-x＝0-2。

10. the method for the coefficient of friction of improvement braiding according to Claim 8, knitting or non-woven fabric fiber carrier, wherein the organo-silicon compound (IV.2) of promoter (IV) are selected from:

A) corresponding to the product (IV.2a) of following general formula:

In this general formula:

-R ⁶Be linear or branching C ₁-C ₄Alkyl,

-R ⁷Be linearity or branched-alkyl,

-y equals 0,1,2 or 3 and

-X is by following general formula definition:

Wherein:

-E and D are to be selected from linear or branching C ₁-C ₄Identical or different group in the alkyl,

-z equals 0 or 1,

-R ⁸, R ⁹And R ¹⁰, be expression hydrogen or linear or branching C ₁-C ₄The identical or different group of alkyl and

-R ⁸And R ⁹Or R ¹⁰Additionally may constitute 5-to 7-unit alkyl ring together and with two carbon that carry epoxy radicals,

B) or, by the product (IV.2b) that epoxy functional polydiorganosiloxanepolyurea class is formed, this epoxy functional polydiorganosiloxanepolyurea comprises:

(i) at least a siloxy unit of following formula:

$X_p{G}_q\mathrm{SiO}\frac{4-(P+q)}{2}---(\mathrm{IV}.2b1)$

In this general formula:

-X is for the defined group of general formula (IV.2a) as above

-G be activity of such catalysts is not had a detrimental effect and be selected from the alkyl that contains 1-8 carbon atom (comprising end value) and be selected from monovalence hydrocarbyl group in the aryl, this alkyl is optional to be replaced by at least one halogen atom,

-p=1 or 2,

-q=0,1 or 2,

-p+q=1,2 or 3 and

(2i) at least a siloxy unit of optional following formula:

$G_r\mathrm{SiO}\frac{4-r}{2}---(\mathrm{IV}.2b2)$

G has with above identical meaning and r and equals 0,1,2 or 3 in this general formula.

11. the method for the coefficient of friction of improvement according to Claim 8 braiding, knitting or non-woven fabric fiber carrier, wherein the metal M of chelate and/or alkoxide (IV.3) is selected from following tabulation: Ti, Zr, Ge, Li or Mn.

12. according to the method for the coefficient of friction of claim 9,10 and 11 improvement braiding, knitting or non-woven fabric fiber carrier, wherein adhesion promotor (IV) comprises following mixture of ingredients:

-by the vinyltrimethoxy silane (VTMO) of general formula (IV.1) expression,

-by the 3-glycidoxypropyltrime,hoxysilane (GLYMO) of general formula (IV.2) expression and

-by the butyl titanate of general formula (IV.3) expression.

13. according to one the method for coefficient of friction of improvement braiding, knitting or non-woven fabric fiber carrier in the aforementioned claim, wherein this polysiloxane (I) contains:

(i) the siloxy unit of following formula:

$R_a^1{Z}_b\mathrm{SiO}\frac{4-(a+b)}{2}---(I-1)$

In this general formula:

-symbol R ¹The expression alkenyl, preferred vinyl or allyl,

-this symbols Z, they can be identical or different, that represent separately activity of such catalysts is not had a detrimental effect and be selected from the alkyl that contains 1-8 carbon atom (comprising end value) and be selected from monovalence hydrocarbyl group in the aryl, this alkyl is optional to be replaced by at least one halogen atom

-a is 1 or 2, b be 0,1 or 2 and the summation of a+b equal 1,2 or 3 and randomly

(ii) other siloxy unit of following general formula:

Zc SiO Erreur！(I-2)

In this general formula:

-Z has the meaning identical with the above and c is 0,1, and 2 or 3.

14. according to one the method for coefficient of friction of improvement braiding, knitting or non-woven fabric fiber carrier in the aforementioned claim, wherein this polysiloxane (II) comprising:

The siloxy unit of-following formula:

$H_d{L}_e\mathrm{SiO}\frac{4-(d+e)}{2}---(\mathrm{II}-1)$

Wherein:

-group L, can be identical or different, expression does not have the monovalence alkyl of detrimental effect to activity of such catalysts separately, this alkyl preferably is selected from and contains the optional by the alkyl that at least one halogen atom replaced of 1 to 8 carbon atom (comprising end value), advantageously methyl, ethyl, propyl group and 3,3, the 3-trifluoropropyl group, with be selected from aryl, advantageously 3,5-dimethylphenyl, tolyl or phenyl

-d is 1 or 2, and e is 0,1 or 2, the summation of d+e equal 1,2 or 3 and

-randomly, other unit of at least some is the unit of following average general formula:

$L_g\mathrm{SiO}\frac{4-g}{2}---(\mathrm{II}-2)$

Wherein group L has with above identical meaning and g and equals 0,1,2 or 3.

15. according to one the method for coefficient of friction of improvement braiding, knitting or non-woven fabric fiber carrier in the aforementioned claim, wherein polysiloxane (I) and ratio (II) should make that the hydrogen atom and the molar ratio that is connected in the alkenyl on the silicon in (I) that are connected on the silicon in (II) are between 0.4 and 10 and preferably between 0.6 and 5.

16. curable silicone coating composition (A) comprises:

(1) component (a-1) or (a-2):

-at least a the polysiloxane that (a-1) is cured corresponding to the effect that can utilize based on the catalyst of at least a organic peroxide and

-(a-2) corresponding to comprising by the polysiloxane blend of sudden reaction curing:

-per molecule contains at least two C that are connected on the silicon ₂-C ₆At least a polysiloxane (I) of alkenyl group and

-per molecule contains at least a polysiloxane (II) of at least two hydrogen atoms that are connected on the silicon,

(2) curing catalysts of effective dose: when using (a-1), this catalyst is made up of at least a organic peroxide and when using (a-2), this catalyst is made up of at least a metal (or compound) of platinum family,

(3) comprise the particle of at least a resin (III) of at least a (being total to) polyamide,

(4) randomly, at least a reinforcer,

(5) randomly, at least a curing inhibitors (VI),

(6) randomly, at least a color additive (VII) and

(7) randomly, be used to improve at least a additive (VIII) of fire resistance,

(8) at least a adhesion promotor (IV),

(9) randomly, be used to improve the additive system (B) of combing intensity and tearing strength, its each composition adds in order or simultaneously, is made up of the mixture of following component:

-at least a polysiloxane resin (V), it exist with amount with respect to the 60wt% at the most of mixture total weight amount and randomly mix with at least a polysiloxane as diluent and

-calcium carbonate (the CaCO that exists with amount with respect to the 30wt% at the most of the gross weight of mixture ₃).

17. the curable silicone coating composition (A) according to claim 16 comprising:

(1) per molecule contains at least two C that are connected on the silicon ₂-C ₆At least a polysiloxane (I) of alkenyl group,

(2) per molecule contains at least a polysiloxane (II) of at least two hydrogen atoms that are connected on the silicon,

(3) at least a catalyst (III) formed of at least a metal by belonging to platinum family of catalytically effective amount,

(4) comprise the particle of at least a resin (III) of at least a (being total to) polyamide,

(5) at least a adhesion promotor (IV),

(6) additive system (B), its each composition adds in the mixture in order or simultaneously, is made up of the mixture of following ingredients:

-at least a polysiloxane resin (V), it exist with amount with respect to the 60wt% at the most of mixture total weight amount and randomly mix with at least a polysiloxane as diluent and

-calcium carbonate (the CaCO that exists with amount with respect to the 30wt% at the most of the gross weight of mixture ₃);

(7) randomly, at least a curing inhibitors (VI),

(8) randomly, at least a reinforcer,

(9) randomly, at least a color additive (VII) and

(10) randomly, be used to improve at least a additive (VIII) of fire resistance.

18. according to each curable silicone coating composition (A) in claim 16 and 17, wherein the particle of resin (III) has sphere.

19. according to the curable silicone coating composition (A) of claim 18, wherein the average diameter of the particle of resin (III) is between 5 and 100 μ m.

20. according to any one curable silicone coating composition (A) among the claim 16-19, wherein the particle of resin (III) comprises at least a (being total to) polyamide, is selected from: polyamide-6, polyamide-6.6, polyamide-4, polyamide-11, polyamide-12, polyamide 4-6,6-10,6-12,6-36 and 12-12, and their copolymer and blend.

21. according to the curable silicone coating composition (A) of claim 20, wherein the particle of resin (III) comprises polyamide-12.

22. according to each composition in the claim 16 to 21, wherein this adhesion promotor (IV) comprises following mixture of ingredients:

-by the vinyltrimethoxy silane (VTMO) of general formula (IV.1) expression,

-by the 3-glycidoxypropyltrime,hoxysilane (GLYMO) of general formula (IV.2) expression and

-by the butyl titanate of general formula (IV.3) expression.

23. according to each composition among the claim 16-22, wherein the particle of resin (III) is with 40wt% at the most, preferably with the ratio of 1%-30% (weight) and even more preferably exist with the ratio of 5%-20% (weight), with respect to the gross weight of mixture.

24. be used for each the bi-component or the multicomponent precursor systems (C) of curable silicone coating composition (A), comprise according to claim 16-23:

-two independent part A and B, they will be mixed together the formation composition and

Among-part A or the B one comprises catalyst and only a kind of polysiloxane material (I) or (II).

25. scribble elastomeric braiding, knitting or non-woven fabric fiber carrier on one or two face, it can obtain by the following method:

A)-on one or two face of braiding, knitting or non-woven fabric fiber carrier, apply 10g/m at least ²According among the claim 16-23 each silicone paint composition (A) or by mix according to the part A of the bicomponent system (B) of claim 24 and B resultant composition and

-form elastomer by electromagnetic radiation or by infrared radiation heating to being solidificated in the deposit that forms in the preceding step up to 210 ℃ temperature, or

B) by according to each method in the claim 1 to 15.

26. according to each curable silicone composition (A) among the claim 16-23, according to the bi-component of claim 24 or multicomponent system (C) or according to claim 25 in the braiding that is coated with application layer on one or two face, the knitting or purposes of non-woven fabric fiber carrier in the field of the inflatable air bag of vehicle.

27. air bag comprises the braiding that is coated with application layer on one or two face according to claim 25, knitting or non-woven fabric fiber carrier.