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WO2007136911A2 - Pellicule plastique capable de disperser de la vapeur, présentant des propriétés d'adhérence à la peinture et d'auto-adhérence - Google Patents

Pellicule plastique capable de disperser de la vapeur, présentant des propriétés d'adhérence à la peinture et d'auto-adhérence Download PDF

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Publication number
WO2007136911A2
WO2007136911A2 PCT/US2007/063695 US2007063695W WO2007136911A2 WO 2007136911 A2 WO2007136911 A2 WO 2007136911A2 US 2007063695 W US2007063695 W US 2007063695W WO 2007136911 A2 WO2007136911 A2 WO 2007136911A2
Authority
WO
WIPO (PCT)
Prior art keywords
plastic film
film according
inner layer
film
filler
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/US2007/063695
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English (en)
Other versions
WO2007136911A3 (fr
Inventor
Graham Chapman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
PETOSKEY PLASTICS Inc
Original Assignee
PETOSKEY PLASTICS Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/US2006/019248 external-priority patent/WO2006125087A2/fr
Application filed by PETOSKEY PLASTICS Inc filed Critical PETOSKEY PLASTICS Inc
Priority to US12/301,413 priority Critical patent/US20100003463A1/en
Publication of WO2007136911A2 publication Critical patent/WO2007136911A2/fr
Publication of WO2007136911A3 publication Critical patent/WO2007136911A3/fr
Anticipated expiration legal-status Critical
Priority to US13/039,939 priority patent/US20110174439A1/en
Priority to US13/737,499 priority patent/US20130130005A1/en
Ceased legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/16—Layered products comprising a layer of synthetic resin specially treated, e.g. irradiated
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
    • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/025—Electric or magnetic properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00—Layers arrangement
    • B32B2250/03—3 layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/104—Oxysalt, e.g. carbonate, sulfate, phosphate or nitrate particles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2266/00—Composition of foam
    • B32B2266/02—Organic
    • B32B2266/0214—Materials belonging to B32B27/00
    • B32B2266/025—Polyolefin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2270/00—Resin or rubber layer containing a blend of at least two different polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption

Definitions

  • the present invention relates to a plastic film for masking and protecting a vehicle that minimizes bloom when used on a wet vehicle, while providing desirable cling to the vehicle and desirable paint adherence.
  • the art of modifying and controlling the vapor permeability of thin polymer films is well established in the plastics industry. This control is mostly concerned with modifying the transmission through the film of small molecules, such as those of water, carbon dioxide and oxygen and is generally confined to a temperature range from 4 0 C to around body temperature of 37 0 C. However, for certain applications, such as those involving the curing of paints, it is important to control the vapor transmission of plastic film at temperatures around 60 0 C. The vapor molecules involved, apart from moisture, tend to be low molecular weight organic compounds used as solvents.
  • Prior attempts to remedy the problem of bloom have included films that permit vapor to pass through the films, which have had limited success.
  • One prior film that has had some success in reducing bloom is a three layer film with identical inner and outer layers, each layer being formed of a combination of low density polyethylene (LDPE) and linear low density polyethylene (LLDPE), wherein a particulate material is incorporated in the inner and outer layers of the film.
  • LDPE low density polyethylene
  • LLDPE linear low density polyethylene
  • This film is identical on both sides so that either side of the film can be used as a body contact surface.
  • this film has substantially less satisfactory cling characteristics compared with a desirable film that does not transmit vapors.
  • An object of the present invention is to provide a vapor dispersible film that retains good cling, paint adherence, and other physical characteristics.
  • a relatively new method to measure the performance of different films with respect to "bloom” has been developed and is used herein. This consists of painting metal sheet with a typical automotive paint - two layers of etching undercoat, three layers of colored basecoat and two layers of clearcoat. This is then sprayed with moisture from an atomizing bottle and strips of the plastic films to be tested are then be fixed to the surface. The metal sheet is placed in an oven at 60 0 C for 30 minutes. After cooling the film is stripped off and the amount of "bloom” is estimated. A scale from 0 to 100% is used to describe the amount of bloom under each of the strips. 100% refers to a surface where the paint is still visible as 100% and there is no ghosting.
  • the present invention is an improved paint masking material that disperses vapors while still retaining good cling and paint adherence characteristics.
  • the invention comprises a co- extruded plastic film having a relatively thin inner layer comprising a polyethylene or polypropylene (or other polyolefin) that has good static or physical cling properties, in which a substantial quantity of a relatively large particle size filler material is incorporated, in combination with an outer layer that is treated or incorporates a polar material so as to improve paint adherence.
  • At least one layer, preferably at least the outer layer comprises a high density polyethylene (or other high density polyolefin).
  • the high density material has the beneficial effect of producing or retaining an enhanced static cling in the inner layer.
  • This enhanced cling in the inner layer offsets to a substantial amount a decrease in cling that would otherwise be produced by the bumpy surface contour produced by the incorporation of a substantial quantity of large particle size filler material in the inner layer.
  • the film can have a middle or core layer that improves the physical characteristics of the film.
  • the filler is added to the inner layer in contact with the vehicle to provide a rough surface to the film, thereby preventing closure of the film surface over the vehicle and entrapping the volatiles under the film.
  • a desiccant can be included in this layer to help absorb the moisture.
  • a desiccant also can be used as the filler material.
  • the fillers in the film help raise the lateral vapor transmission rate of the film. This helps prevent the entrapment of volatiles under the film during curing of the paint.
  • Fillers having a median particle size of at least about 5 microns and preferably at least about 8 - 10 microns (a "coarse" particle size) are preferred, although a median particle size of at least 4 microns works.
  • Known materials with good static or physical cling properties that can be used in the inner layer include high density polyethylene (HDPE) and linear low density polyethylene (which includes ultra linear low density polyethylene, ULLDPE). Polypropylene and other polyolefins that have comparable cling properties also can be used.
  • LLDPE is desirable because it also is inexpensive and has desirable strength, tear and other physical characteristics. Embossing the inner layer also can be employed to provide a rough surface to enhance lateral vapor transmission.
  • the filler can be treated with a conditioning agent such as stearic acid or the like to improve compatibility between the filler and the inner layer, which improves the physical characteristics of the filled film.
  • the middle or core layer in the preferred invention is selected for its contribution to the physical characteristics of the film.
  • Polyethylene or polypropylene or other comparable polyolefins having good tear and strength and penetration properties can be used.
  • the core layer can be foamed to increase film porosity (the ability of vapor to pass through the film), but this should not be necessary with the preferred films having desirable lateral transmissivity characteristics. If increased film thickness or increased porosity is desired, these can be achieved by foaming the film.
  • Foaming of thermoplastic polymers in film blowing has been described previously, e.g. by Boyd et al US Pat. No. 4,657,811, but in the present invention foaming, if desired, is achieved by incorporating a chemical blowing agent, preferably an endothermic blowing agent, with the extrusion melt.
  • the outer surface desirably comprises a high density polyethylene, preferably medium molecular weight high density polyethylene (MMW HDPE).
  • MMW HDPE medium molecular weight high density polyethylene
  • HMW HDPE high molecular weight high density polyethylene
  • Other high density polyolefins also can be used.
  • the outer surface of the film also can be treated by corona treating or other process to increase the polarity of the film to a level greater than 35 dynes/cm and preferably to 45 or 50 dynes/cm or more.
  • a relatively polar polymer such as ethylene vinyl acetate (EVA) or similar polar polymer can be incorporated into the outer layer in order to increase the polarity of the outer layer.
  • EVA ethylene vinyl acetate
  • Incorporating EVA or other polar polymer into the outer layer can be used as an alternative to corona treating as a means for increasing the polarity of the outer surface of the film, although they can be used together.
  • FIG. 1 is a cross sectional view of a three layer plastic film in accordance with the present invention.
  • the films 10 described are made by thermoplastic co-extrusion of polyolefins using the established blown film process or film casting.
  • the weight thickness of the film is between 0.3 mils and 2.5 mils, although, either because of the foaming process, the use of particulate fillers or embossing, the caliper thickness of the film can be as high as 4.5 mil. It is generally desirable to make a film as thin as possible, in order to minimize film cost, which is largely controlled by material costs. Minimum film thickness is primarily limited by manufacturing capabilities. At the present time, the minimum film thickness possible for a three layer film with existing equipment is about 0.3 mils to about 0.5 mils. A thinner film would be expected to work if it could be made.
  • maximum film thickness is controlled primarily by the cost of the additional material, although increased film stiffness also can become a factor with thick films. A film thickness in excess of about 0.8 mils should not be necessary and would be more expensive. However, a maximum film thickness for a three layer film of up to about 2.5 mils would be satisfactory.
  • a three-layer film is described herein, but a film having a greater number or a smaller number of layers can be employed. In a three layer film, the thickness range of the inner and outer layers can vary between about 0.05 and 0.5 mils, and the core layer thickness can vary between about 0.2 and 1.5 mils.
  • the main thermoplastic polymers used in the film layers are selected for physical properties of the finished film and cost.
  • polyolefins are used from the groups comprising low density polyethylene, medium density polyethylene, high density polyethylene, linear low density polyethylene, metallocene low density polyethylene, homopolymer polypropylene, copolymer polypropylene and thermoplastic olefins.
  • the outer layer 12 may incorporate a relatively polar polymer with surface energy significantly higher than a pure polyolefin, such as ethylene vinyl acetate (with a vinyl acetate content from 3 to 28%), ethylene vinyl alcohol (with an ethylene content between 27 and 48%), poly- (ethylene acrylic acid), poly- (ethylene methyl acrylic acid), neutralized poly-(ethylene acrylic acid), poly-(ethylene methylacrylate), poly- (ethylene ethyl acrylate).
  • a corona treated high density polyethylene provides sufficient surface energy for paint adherence.
  • Medium molecular weight HDPE is preferred, but high molecular weight HDPE is satisfactory.
  • the outer layer can be treated to produce a relatively higher surface energy, typically by corona treatment (ionization of the air caused by the stress of high voltage impressed across an insulator), but other methods can be used, e.g. flame treatment.
  • the level of treatment is to a level greater than 35 dynes/cm, and can be as high as 50 dynes/cm, or higher. A level of greater than 45 dynes/cm is especially desirable.
  • Corona treatment is generally used when EVA or other polar polymer is not included in the outer layer.
  • the outer layer is typically about 20% - 30% of the weight thickness of the film but could be about 10-40% of the thickness. A minimum of about 10% is employed in order to ensure that the film completely covers the outer layer. Maximum thickness is restricted principally to reduce cost.
  • the core layer 14 is usually the main structural layer, typically being as high as 50% of the structure's weight. In addition to the polyolefin selected, some recycled resin, as high as 50%, can be incorporated in this layer.
  • the core can be formed of polyethylene or polypropylene or other comparable polyolefin. HDPE can be used.
  • the core also can desirably be formed from LLDPE. This provides good strength and tear characteristics and is cost effective.
  • the core can be formed from other polymers and can be foamed to increase the vapor permeability of the overall structure. Foaming during extrusion can be achieved by several means, either chemical or physical. In chemical foaming the foaming agent decomposes or reacts at a particular temperature in the extrusion process. This can either be exothermic, such as the release of nitrogen from the decomposition of azodicarbonamide, or endothermic, such as the release of carbon dioxide from the reaction of sodium bicarbonate and an acid.
  • the foaming agent is directly injected into the polymer melt.
  • the compounds injected can be either liquids, such as pentane or butane, or gases, such as carbon dioxide or nitrogen.
  • the disadvantage of the injection method is that it requires machinery modification, so the method used in the present invention is the incorporation of a chemical blowing agent, particularly an endothermic blend.
  • Endothermic blowing agents are available from various suppliers, such as Ampacet's 703061-H, which contains 50% foaming agent and generates gas in the temperature range of 192-215 0 C. This range is typically encountered during polyolefin extrusion.
  • the amount of the concentrate added can be between 0.1 and 2.0%, but even at the lower level an increase in vapor permeability is observed.
  • the inner layer 16 of the plastic film structure is the one that is in contact with the vehicle 18 or other substrate and therefore has most effect on the generation of "bloom” or "ghosting" when a damp vehicle has the film applied and is sent for curing.
  • a simple polyethylene inner layer after using the film to cover a damp vehicle and curing of new paintwork at 60 0 C, there are light patches visible where the moisture had been. This is the problematic "ghosting" or "blooming". In the present invention this simple inner layer is modified by one or a combination of ingredients.
  • the inner layer is formed of a polyethylene or polypropylene or other polyolefin that exhibits good physical cling or static cling properties.
  • HDPE has good static cling properties.
  • ULLDPE ULLDPE
  • ULLDPE ULLDPE
  • One of the features of the present invention is that when one of the layers of the film employs a high density polyolefin, such as high density polyethylene, the cling in the inside layer of the film is enhanced and remains relatively high even in the presence of a substantial amount of particulate material in the inner layer. Even when the inner layer is formed of a material having a lower density than HDPE, the presence of HDPE in an outer layer induces increased static cling in the inner layer.
  • the inner layer comprises about 10-40% of the total thickness of the film and preferably about 30% of the total thickness.
  • a filler 20 such as calcium carbonate, talc, diatomaceous earth and other silicates and silicas is incorporated in the inner layer.
  • the filler needs to be of relatively large particle size in order to impart sufficient surface "roughness" to the film so as to permit lateral escape of vapor.
  • An average particle size of about 4-20 microns will work.
  • a median particle size of at least 5 microns and desirably at least 8 microns is preferred.
  • An especially preferred particle size has an median particle size of around 8-10 microns, with a cut off of 17 to 80 microns. The amount added is a compromise between improving the "roughness" and the negative effect on the physical characteristics of the film.
  • the range of addition is 5 to 50% of the concentrate (which contains 50 to 75% filler additive in a polymer carrier).
  • the filler concentrate comprises about 40% of the inner layer, with the concentrate comprising about 65 % particulate material, which means that the inner layer is about 26% particulate filler material. It is desirable to include about 20-30% of this particulate material in a film wherein the inner layer is 0.5-0.8 mils and preferably 0.6 mils thick. When the median particle size of the filler is greater than the thickness of the inner layer, this ensures that the inner layer will have a bumpy, modified surface with a minimum of filler.
  • vapors from the painted vehicle surface which vapors include not only water vapor but also vapors from volatile solvents from the paint, typically low molecular weight organics. It may be desirable to increase the total amount of filler in the inner layer if a smaller median particle size filler is used or if a thicker inner layer is used in the film. Because of the improved cling provided by the use of a higher density material in one or more layers, particularly in an outer layer, the size and quantity of filler in the inner layer can be high enough to provide sufficient vapor transmissivity to virtually eliminate bloom without reducing cling to an unsatisfactory level.
  • the middle layer and outer layer can retain their strength without filler, while maximizing the effect of filler in the inner layer.
  • a filler can be added to the middle layer, but this has been found to be unnecessary to produce adequate vapor transmissivity in the film.
  • a dessicant 22 can be added to absorb some of the moisture vapor.
  • This is typically in the form of a calcium oxide concentrate, such as Ampacet's 101499 containing a nominal 50% calcium oxide.
  • a calcium oxide concentrate such as Ampacet's 101499 containing a nominal 50% calcium oxide.
  • the dessicant also can serve as a filler and will impart a surface roughness that enhances lateral escape of vapor.
  • the inner layer also can be embossed in order to increase the roughness and vapor transmissivity of the inner layer.
  • a very low density polyethylene or an ultra linear low density polyethylene can be added to any or all of the layers, up to a level of 50%, in order to increase the porosity of the layer, if this is desired or necessary.
  • the increased porosity and vapor permeability of the layer and the film facilitates the transport of molecules through the film.
  • the blow up ratio is more than 3.5:1 and even more than 4.5:1. When this is done with a film containing the filler particulates the vapor transmission rate is increased.
  • Tests also were performed on a film having an outside layer composed of corona treated 100% MMW HDPE, a core layer of 100% LLDPE, and an inner layer composed of 60% LLDPE and 40% coarse particle size filler concentrate (which comprises about 65% particulate having a median particle size of 8-10 microns, thus contributing about 26% particulate material to the composition).
  • the total film thickness was about 0.6 mils thick, with the outer, core, and inner layers comprising about 20%, 50%, and 30%, respectively, of the film thickness.
  • the results with this film indicated superior film cling and paint adherence and a 100 bloom rating.
  • the cost and physical characteristics of this film (including cling) also were superior.

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Abstract

L'invention concerne une pellicule plastique coextrudée comportant une couche extérieure composée d'un polymère ou d'un copolymère haute densité présentant une énergie de surface élevée, tel qu'un polyéthylène haute densité de poids moléculaire moyen ayant subi un traitement corona ou contenant un polymère relativement polaire; une couche centrale de préférence formée d'une polyoléfine, pouvant contenir du polyéthylène faible densité linéaire ou un polymère moussé de préférence produit au moyen d'un agent d'expansion endothermique; et une couche intérieure composée d'un polymère ou d'un copolymère présentant de bonnes propriétés statiques ou d'auto-adhérence physique, contenant une charge de granulométrie suffisamment élevée et dans une quantité suffisante pour que de la vapeur d'eau puisse s'échapper latéralement par dessous la pellicule. La couche intérieure peut également contenir un agent de dessication et peut être gaufrée. La pellicule permet aux vapeurs de se disperser, est capable d'absorber l'humidité et est perméable à la vapeur. Ladite pellicule a l'avantage qu'une surface présente une adhérence à la peinture élevée et que la surface opposée présente une auto-adhérence à un substrat, notamment à une surface métallique peinte ou simple.
PCT/US2007/063695 2005-05-18 2007-03-09 Pellicule plastique capable de disperser de la vapeur, présentant des propriétés d'adhérence à la peinture et d'auto-adhérence Ceased WO2007136911A2 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US12/301,413 US20100003463A1 (en) 2006-05-18 2007-03-09 Vapor dispersible plastic film with paint adherence & cling
US13/039,939 US20110174439A1 (en) 2005-05-18 2011-03-03 Vapor dispersible plastic film with paint adherence & cling
US13/737,499 US20130130005A1 (en) 2005-05-18 2013-01-09 Vapor dispersible plastic film with paint adherence & cling

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
PCT/US2006/019248 WO2006125087A2 (fr) 2005-05-18 2006-05-18 Film plastique dispersant la vapeur, adherant a la peinture et a auto-adherence
USPCT/US2006/019248 2006-05-18

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2006/019248 Continuation-In-Part WO2006125087A2 (fr) 2005-05-18 2006-05-18 Film plastique dispersant la vapeur, adherant a la peinture et a auto-adherence

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US13/039,939 Continuation US20110174439A1 (en) 2005-05-18 2011-03-03 Vapor dispersible plastic film with paint adherence & cling

Publications (2)

Publication Number Publication Date
WO2007136911A2 true WO2007136911A2 (fr) 2007-11-29
WO2007136911A3 WO2007136911A3 (fr) 2008-09-18

Family

ID=38723927

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