DE1248290B - Molding and coating compounds made of polyethylene and polyisobutylene - Google Patents

Description

FEDERAL REPUBLIC OF GERMANY

GERMAN

PATENT OFFICE

EDITORIAL

Int. Cl .:

C08f

CU8L 23 /

German class: 39 b-22/06 C Ö 8 L 2 j /

Number: 1 248 290

File number: J 22051IV c / 39 b

Filing date: July 4, 1962

Opened on: August 24, 1967

The invention relates to molding and coating compositions which have particularly good properties distinguish.

There are already foils made of specially prepared mixtures of polyisobutylene and polyethylene for the food packaging has been manufactured. These products have a high shrinkage capacity and are therefore unsuitable for many applications. Also let them up Do not use as coatings on various substrates because of their poor adhesion.

The molding and coating compositions according to the invention made from a low molecular weight polyethylene and polyisobutylene now also contain a Friedel-Crafts catalyst obtained polymer of cyclopentadiene dimers and optionally a solvent and / or a dye or pigment which is inert towards the polymers.

The combination of components according to the invention leads to outstanding properties of the products. The compositions according to the invention are therefore suitable for many purposes. For example, they can be used in powder form to make molded products. But they are also suitable for use in casting processes. However, the compositions according to the invention are very particularly suitable as coating compositions for any substrates, in particular for metals. The products and coatings obtained from the compositions according to the invention are distinguished in particular by the following physical and chemical properties. They are chemically stable and inert. Thus, they are, for example, against strong acid and alkaline media at temperatures ranging from - 70 to +100 ⁰ C resistant. The coatings also have excellent adhesiveness to the substrates. The coatings can also be dried in a room atmosphere (drying time 3 to 8 hours depending on temperature and humidity). The parts therefore do not need to be placed in an oven and are thus protected from changes in their dimensions. None of the individual components contained in the compositions according to the invention alone has all of these advantageous properties. Mixtures of only polyethylene and polyisobutylene do not have these properties either. The inclusion of the diene resin, in conjunction with the polyisobutylene, when the composition is used as a coating, ensures that the polyethylene has good adhesion to the surface to be coated. Furthermore, by including the diene resin, the molding and coating compositions are made of polyethylene and polyisobutylene

Applicant:

International Business Machines Corporation,
Armonk, NY (V. St. A.)

Representative:

Dr. L. Wessely, patent attorney,

Munich 19, Montenstr. 9

Named as inventor:
Jean Durand, St. Mande, Seine (France)

Claimed priority:

France of July 4, 1961 (866 861)

Formation of cracks on drying, to the polyethylene when applied in a solvent medium is, tends, avoided. In addition, the diene resin sets the tendency of polyisobutylene to form threads when used in a solvent medium.

A special purpose in the field of coatings for which the compositions according to the invention are particularly suitable are protective covers for use in electrolytic treatments. Here have the Compositions according to the invention have the advantage over the products known for this purpose that they can easily be applied by screen printing and do not contaminate the treatment baths. in the In contrast to the known products, the products according to the invention do not contain any products on the basis of bitumen.

As the cyclopentadiene resin, a thermoplastic hard hydrocarbon resin is preferred which softens in the range from 95 to 105 ° C and polymers of dimers and codimers of cyclopentadiene and alkylcyclopentadiene, e.g. B. Methylcyclöpentadiene contains. Such a resin is obtained by one obtained from a petroleum-steam cracking fraction, these dimers and codimers containing fraction in the usual way with Friedel-Crafts catalysts, for example boron trifluoride or aluminum chloride, at temperatures between 0 and 35 ° C with a contact time of about 5 minutes is polymerized to 10 hours, the

709 638/592

3 4

Time and temperature to achieve the desired coating in electrolysis processes, the examination of whether

Melting point of the product depending on the ratio the product is correctly applied to make it easier.

of dimers, codimers and monomers in the

Charging can be controlled and where 1 to 5% of the masses according to the invention are, for example:

Friedel-Crafts catalyst is used, which in the 5th

preferred case is boron trifluoride, which is in a solvent, for example aro-

Concentration of 1% in the low tem- perature solvent with

temperature range is used, with a hard high- a flash point of

Melting polymer with a softening temperature of at least 65 ° C or heavier

point above 95 ° C after removal of non-polymeric aliphatic hydrocarbons

sated materials and low-melting frac-containing solvents

tions obtained by extraction with solvent (boiling range 135 to 200 ° C)

will. The manufacture of such resins is in the USA - about 1000 ecm

U.S. Patent 2,963,456. Polyisobutylene 20 to 500 g

Of these resins, which in their physical 15; _{E nacn} the form of semi-solid polymers to hard, high-polymer melting polymers with a degree of softening vary above about 100 ° C, the high-polyethylene 50 to 100 g melting polymers of this type are preferred. ''. ,, £ "

The desired 20 contained in the compositions according to the invention

preferred polymers differs in its consistency

Structure and in its molecular weight, for example _,,. , ",

wise in chain length, from the cyclopentadiene polydiene resin 100 to 2000 g

homopolymer, that in Schildknecht, »poly- depending on the

mer Processes ", Vol. X, Interscience Publishers, 1956, 25 f5 ^ ^u " ^. * ^ei ?

P. 219. Starting from dimers or adhesiveness

Codimers, in the present case, a different pigment or dye is averaged

Branching in the linear chain, as shown above

than would be the case if Cyclopen- 3%

tadiene monomer with the same catalyst 30

would be treated, with low polymers in liquid- ■. example

ger shape rather than solid shape. _{To illustrate this, the following is a recipe for}

Major factor in achieving a high ER- _e ine given as a protective coating suitable mass "

the softening point is undoubtedly the cyclic structure

of the solvent in the first stage according to the special method 35:

for the preparation of the aromatic solvent used here with preference

Resin produced codimers. _{a flash point} of min-

The at least 65 ° C. 950 ecm in the compositions according to the invention

The solvent used depends on the intended dye '

th drying times. However, we recommend 40 permanent red TG 20 g

worth and preferred to use a solvent of the ", · ■

use predominantly aromatic type. As polyisobutylene:

Solvents are both heavier aliphatic weakly polymerisates isobutylene 100 g

see solvents containing hydrocarbons polydiene resin.

as well as naphthalene solvents, which can contain, for example, thermoplastic hydrocarbons, limonene or dipentene, material resin (obtained by Polymeriwendet. The known solvent sation of a petroleum vapor from mainly mononuclear aromatics, which contain side cracking fraction through heat chains or alkyl groups, are also suitable This treatment obtained, dimer solvents can also contain small proportions of dinuclear 50 ™ d codimers of cyclopentadiene ger aromatic compounds, such as, for example, and alkylcyclopentadienes containing indene and naphthalene, whereby they then tend fraction) with the following noticeably better solution properties have characteristics: Softening point than those consisting solely of mononuclear aromatics. (Ball and ring): 100 ° C; Density These products can also contain small amounts of paraf- 55 at 25 ° C: 0.97; Gardner Color: 10; contain fin and naphthene hydrocarbons. The flash point (oT): 280 ⁰ C; by example, consider an aromatic solvent with an average molecular weight: 1100

Mentioned flash point of at least 65 ° C, up to 1400; Acid number: <1 400 to 420 g

the aromatic hydrocarbons, mainly polyethylene:

those of the C ₁₀ - and C _tl series, such as 60 polyethylene with a molecular

Dimethylethyl and tetramethylbenzenes and alkyl weight below 3000 200 g

benzenes. In the final fraction of this solvent there is also a fairly high proportion of The mass has the consistency of liquid Methyl indene and naphthalene. Honey.

The compositions according to the invention can also 65 This product was used in particular as a cover

contain a dye or pigment. Effect in the course of gold and nickel plating

such or such can be checked, for example, in the case of a contradiction. However, it can be used for any other

application of the mass as a coating, e.g. B. as protective applications as protective mass in electrolysis

applied as well as used for other coating purposes will. It is particularly suitable for screen printing.

Claims (3)

Patent claims: 1. Molding and coating compositions made of a polyethylene with low molecular weight and Polyisobutylene, characterized in that that they also have a polymer obtained with the aid of a Friedel-Crafts catalyst of cyclopentadiene dimers and optionally a solvent and / or one opposite the polymers contain inert dye or pigment. 2. molding and coating compositions according to claim 1, characterized in that they are used as Solvents contain a mixture of predominantly aromatic solvents. 3. Molding and coating compounds according to one of the preceding claims, characterized in that that as a polymer of cyclopentadiene dimers it is a polymer of dimers and Codimers of cyclopentadiene and alkylcyclopentadienes, with a softening point of 95 to 105 ° C included. Considered publications:
U.S. Patent No. 2,854,435. 709 638/592 8.67 © Bundesdruckerei Berlin