# US 5,344,679 A · Amorphous nylon copolymer and copolyamide films and blends

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- Number: US 5,344,679 A
- Document ID: US5344679A
- Status: Granted
- Kind: A
- Application number: 07/685,950
- Filed: 1991-04-16
- Granted: 1994-09-06
- Earliest claimed: 1988-08-23
- Assignees: Viskase Corporation
- Inventors: Stephen J. Vicik
- Web page: https://patentgrep.com/patent/US5344679A

## CPC

- B32B 27/34: comprising polyamides
- B32B 27/08: of synthetic resin
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/306: {comprising vinyl acetate or vinyl alcohol (co)polymers}
- B32B 27/32: comprising polyolefins {(comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30)}
- C08L 77/00: Compositions of polyamides obtained by reactions forming a carboxylic amide link in the main chain (of polyhydrazides C08L79/06; of polyamideimides or polyamide acids C08L79/08); Compositions of derivatives of such polymers
- B32B 2307/31: Heat sealable
- B32B 2307/518: bi-axially
- B32B 2307/7244: Oxygen barrier
- B32B 2323/046: LDPE, i.e. low density polyethylene
- B32B 2331/04: Polymers of vinyl acetate, e.g. PVA
- B32B 2377/00: Polyamides
- B32B 2439/70: Food packaging
- B32B 2597/00: Tubular articles, e.g. hoses, pipes
- Y10S 428/91: Product with molecular orientation
- Y10T 428/1393: Multilayer [continuous layer]
- Y10T 428/31725: Of polyamide
- Y10T 428/31732: At least one layer is nylon type
- Y10T 428/31739: Nylon type
- Y10T 428/31743: Next to addition polymer from unsaturated monomer[s]
- Y10T 428/31746: Polymer of monoethylenically unsaturated hydrocarbon
- Y10T 428/3175: Next to addition polymer from unsaturated monomer[s]
- Y10T 428/31757: Polymer of monoethylenically unsaturated hydrocarbon
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

Orientable single and multilayer thermoplastic flexible films utilizing blends comprising an amorphous nylon copolymer such as nylon 6I/6T and a nylon copolyamide having a melting point of at least about 145.degree. C. having improved processability, shrinkage and optical properties.

## Claims

### Claim 1

A thermoplastic, heat shrinkable flexible film, comprising a blend of an amorphous nylon 6I,6T copolymer having no measurable melting point (less than 0.5 calories per gram) or no heat fusion as measured by differential scanning calorimetry, which is present in an amount of from about 10 to about 50 weight percent of said blend, and a copolyamide having a melting point of at least about 145.degree. C. which is selected from the group consisting of nylon 6/12 and nylon 6/66, wherein said film has a shrinkage value in at least one direction of at least 5% at 90.degree. C.

### Claim 2 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said shrinkage value is at least 20%.

### Claim 3 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said shrinkage value is at least 20% in both the machine direction and the transverse direction.

### Claim 4 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said copolyamide has a melting point between about 145.degree. C. and about 215.degree. C.

### Claim 5 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said copolyamide has a melting point between about 195.degree. C. and about 200.degree. C.

### Claim 6 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said copolyamide is present in an amount of from about 24 to 90 weight percent.

### Claim 7 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said copolyamide is present in an amount of from about 40 to 90 weight percent.

### Claim 8 (depends on 1)

A heat shrinkable film, as defined in claim 1, further comprising in said blend an additional nylon 6/12 copolyamide having a melting point less than 145.degree..

### Claim 9 (depends on 1)

A heat shrinkable film, as defined in claim 1, further comprising in said blend nylon 6, nylon 11, or nylon 12 in an amount of from 10 to 30 percent of said blend.

### Claim 10 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said film is uniaxially oriented.

### Claim 11 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said film is biaxially oriented.

### Claim 12 (depends on 1)

A heat shrinkable film, as defined in claim 1, wherein said film is irradiated at a dosage of about 1 to about 5 mrad.