# US 10,479,059 B2 · Multiple layer film and composite material produced therefrom

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- Number: US 10,479,059 B2
- Document ID: US10479059B2
- Status: Granted
- Kind: B2
- Application number: 12/302,298
- Filed: 2008-01-15
- Published: 2009-11-19
- Granted: 2019-11-19
- Earliest claimed: 2007-01-17
- Assignees: Evonik Degussa GmbH
- Applicants: Kirsten Alting; Roland Wursche; Harald Haeger; Martin Wielpuetz
- Inventors: Kirsten Alting; Roland Wursche; Harald Haeger; Martin Wielpuetz
- Web page: https://patentgrep.com/patent/US10479059B2

## CPC

- B32B 27/34: comprising polyamides
- C08G 73/10: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- B32B 27/30: comprising vinyl {(co)polymers; comprising acrylic (co)polymers}
- B32B 2250/03: 3 layers
- B32B 2605/00: Vehicles
- C08L 33/062: {Copolymers with monomers not covered by C08L33/06}
- C08L 33/068: {containing glycidyl groups}
- Y10T 428/31728: Next to second layer of polyamide
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A film comprising the following layers: I. a layer based on a polyamide whose monomer units contain an average of at least 8 carbon atoms, II. an immediately adjacent layer composed of a moulding composition comprising a polyamide as in I. and a copolymer having functional groups is used for the production of a composite with a substrate which comprises PA6, PA66, PA6/66 or PPA, giving secure adhesion.

## Claims

### Claim 1

A film, comprising:
a polyamide layer comprising at least 40% by weight of at least one polyamide selected from the group consisting of PA6, PA66, PA6/66 and a copolyamide, wherein the copolyamide is obtained from PA6, PA66 and PA6/66 and comprises at most 50% of total monomer units replaced by aromatic monomer units;
a second layer formed directly on the polyamide layer, wherein the second layer is obtained from a molding composition consisting of a polyamide composition (a) in an amount of from 50 to 99 parts by weight, a copolymer (b) in an amount of from 1 to 50 parts by weight with respect to a total amount of the polyamide composition (a) and the copolymer (b), and optionally at least one additive selected from the group consisting of a flame retardant, a stabilizer, an antistatic agent, a filler, a dye, and a pigment; and
a first layer formed directly on the second layer, wherein the first layer comprises a molding composition which comprises at least 60% by weight of a polyetheresteramide, the monomer units of the polyamide of the polyetheresteramide comprise an average of at least 8 carbon atoms,
wherein:
the polyamide composition (a) consists of a polyamide (α) in an amount of from 40 to 100% by weight, and a polyamide (β) in an amount of 0 to 60% with respect to a total amount of the polyamide (α) and the polyamide (β);
the polyamide (α) is PA612;
the polyamide (β) is at least one selected from the group consisting of PA6, PA66, PA6/66, and a copolyamide, wherein the copolyamide is obtained from PA6, PA66 and PA6/66 and comprises at most 50% of total monomer units replaced by aromatic monomer units;
the copolymer (b) comprises a first monomer unit in an amount of from 70 to 99.9% by weight and a second monomer unit in an amount of 0.1 to 30% by weight;
the first monomer unit is a monomer unit of at least one vinyl compound selected from the group consisting of an acrylic acid derivative, a methacrylic acid derivative, an α-olefin and a vinylaromatic compound; and
the second monomer unit comprises a functional group selected from the group consisting of a carboxylic anhydride group, an epoxy group, and an oxazoline group.

### Claim 2 (depends on 1)

The film according to claim 1, wherein the molding composition of the first layer comprises at least one of a pigment, a dye, and a metal flake.

### Claim 3 (depends on 1)

The film according to claim 1, further comprising an outer layer.

### Claim 4 (depends on 1)

The film according to claim 1, wherein the copolymer (b) is a polyolefin having an unsaturated anhydride grafted thereon.

### Claim 5 (depends on 4)

The film according to claim 4, wherein the polyolefin is an ethylene-propylene rubber or an ethylene-propylene-diene rubber.

### Claim 6 (depends on 1)

The film according to claim 1, wherein the copolymer (b) comprises the first monomer unit in an amount of from 85 to 99% by weight and the second monomer units in an amount of 1 to 15% by weight.

### Claim 7 (depends on 1)

The film according to claim 1, wherein the first monomer unit of the copolymer (b) is represented by formula (III):
wherein R1 is H or CH3.

### Claim 8 (depends on 1)

The film according to claim 1, wherein the second monomer unit of the copolymer (b) is represented by formula (VII):
wherein R1 is H or CH3.

### Claim 9 (depends on 1)

The film according to claim 1, wherein the second monomer unit of the copolymer (b) is represented by formula (VIII):
wherein R1 is H or CH3.

### Claim 10 (depends on 1)

The film according to claim 1, further comprising an outer layer on the first layer, wherein the outer layer comprises at least one of a polyamide, an acrylate polymer, a fluoropolymer or a clear polyurethane-based lacquer.

### Claim 11 (depends on 10)

The film according to claim 10, wherein the polymer constitution of the outer layer is the same as the polymer constitution of the first layer.

### Claim 12 (depends on 1)

The film according to claim 1, wherein the molding composition consists of the polyamide composition (a) in an amount of from 50 to 99 parts by weight, the copolymer (b) in an amount of from 1 to 50 parts by weight with respect to a total amount of the polyamide composition (a) and the copolymer (b), and optionally at least one additive selected from the group consisting of a stabilizer, a dye and a pigment.

### Claim 13 (depends on 1)

A method of preparing the film according to claim 1, the method comprising forming the second layer directly on the polyamide layer and forming the first layer directly on the second layer.

### Claim 14 (depends on 1)

A composite part, comprising the film of claim 1 applied to a polyamide substrate.

### Claim 15 (depends on 14)

The composite part according to claim 14, wherein the film is applied on the polyamide substrate by adhesive bonding, pressing, lamination or extrusion, or by an injection-molding method, foaming method, or compression-molding method for reverse coating.

### Claim 16 (depends on 14)

The composite part according to claim 14, wherein the composite part is an engine cover, a battery cover, a battery casing or a cover or a casing for electronics components.

### Claim 17 (depends on 14)

The composite part according to claim 14, wherein:
the polymer constitution of the polyamide (β) is the same as the polymer constitution of the polyamide layer.

### Claim 18 (depends on 14)

The composite part according to claim 14, wherein the film is applied directly to the polyamide substrate.

### Claim 19 (depends on 14)

A method of preparing the composite part according to claim 14, the method comprising applying the film on the polyamide substrate.