# US 11,999,094 B2 · Biaxially oriented polyamide film and polyamide film mill roll

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- Number: US 11,999,094 B2
- Document ID: US11999094B2
- Status: Granted
- Kind: B2
- Application number: 17/424,728
- Filed: 2019-12-26
- Published: 2022-01-13
- Granted: 2024-06-04
- Earliest claimed: 2019-01-28
- Assignees: Toyobo Co., Ltd.
- Applicants: Toyobo Co., Ltd.
- Inventors: Takuro Endo; Kosuke Hama
- Web page: https://patentgrep.com/patent/US11999094B2

## CPC

- B29C 55/143: {firstly parallel to the direction of feed and then transversely thereto}
- B29C 55/023: {using multilayered plates or sheets}
- B29C 55/14: successively
- B29C 55/18: by squeezing between surfaces, e.g. rollers
- B32B 27/08: of synthetic resin
- B32B 27/16: specially treated, e.g. irradiated
- B32B 27/18: characterised by the use of special additives
- B32B 27/34: comprising polyamides
- C08L 77/02: Polyamides derived from omega-amino carboxylic acids or from lactams thereof (C08L77/10 takes precedence)
- C08L 77/10: Polyamides derived from aromatically bound amino and carboxyl groups of amino-carboxylic acids or of polyamines and polycarboxylic acids
- B29K 2077/00: Use of {PA, i.e.} polyamides, e.g. polyesteramides {or derivatives thereof}, as moulding material
- B29K 2995/0053: bi-axially
- B29K 2995/0089: Impact strength or toughness
- B32B 2250/03: 3 layers
- B32B 2250/24: All layers being polymeric
- B32B 2250/40: Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
- B32B 2264/1021: Silica
- B32B 2270/00: Resin or rubber layer containing a blend of at least two different polymers
- B32B 2307/518: bi-axially
- B32B 2307/54: Yield strength; Tensile strength
- B32B 2307/558: Impact strength, toughness
- B32B 2307/72: Density
- B32B 2307/7244: Oxygen barrier
- B32B 2307/736: Shrinkable
- B32B 2307/748: Releasability
- B32B 2439/06: Bags, sacks, sachets
- B32B 2439/70: Food packaging
- C08L 2203/16: used for films
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- 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)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

To provide a gas barrier biaxially oriented polyamide film and a polyamide film mill roll, even as a product that is close to an end of a mill roll, having favorable mechanical characteristics, thermal characteristics, and few S-shape curling due to moisture absorption after being made into a bag. A biaxially oriented polyamide film having at least one layer formed of a polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide), wherein a molecular orientation angle of the film is not smaller than 20°, a strain at moisture absorption of the film is not higher than 1.3%, an impact strength of the film is not lower than 0.7 J/15 μm, and a heat shrinkage rate, after heating for ten minutes at 160° C., of the film is 0.6 to 3.0% in both an MD direction and a TD direction.

## Claims

### Claim 1

A biaxially oriented polyamide film having at least one layer formed of a polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide), wherein
a molecular orientation angle of the film is not smaller than 20°,
a strain at moisture absorption of the film is not higher than 1.3%,
an impact strength of the film is not lower than 0.7 J/15 μm, and
a heat shrinkage rate, after heating for ten minutes at 160° C., of the film is 0.6 to 3.0% in both an MD direction and a TD direction.

### Claim 2 (depends on 1)

The biaxially oriented polyamide film according to claim 1, wherein an oxygen permeability of the biaxially oriented polyamide film is 60 to 140 ml/m2·day·MPa.

### Claim 3 (depends on 2)

The biaxially oriented polyamide film according to claim 2, wherein a strain at thermal shrinkage, after heating for ten minutes at 160° C., of the film is not higher than 2.0%.

### Claim 4 (depends on 3)

The biaxially oriented polyamide film according to claim 3, wherein a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on at least one surface of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 5 (depends on 4)

The biaxially oriented polyamide film according to claim 4, wherein a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on each of both surfaces of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 6 (depends on 1)

The biaxially oriented polyamide film according to claim 1, wherein a strain at thermal shrinkage, after heating for ten minutes at 160° C., of the film is not higher than 2.0%.

### Claim 7 (depends on 1)

The biaxially oriented polyamide film according to claim 1, wherein a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on at least one surface of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 8 (depends on 1)

The biaxially oriented polyamide film according to claim 1, wherein a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on each of both surfaces of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 9

A polyamide film mill roll of a biaxially oriented polyamide film having at least one layer formed of a polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide), wherein
a molecular orientation angle of the film at each of positions that are inward by 300 mm from a right end and a left end in a transverse direction of the film mill roll is not smaller than 20°,
an impact strength of the film at each position is not lower than 0.7 J/15 μm,
a strain at moisture absorption of the film at each position is not higher than 1.3%, and
a heat shrinkage rate, after heating for ten minutes at 160° C., of the film at each position is 0.6 to 3.0% in both an MD direction and a TD direction.

### Claim 10 (depends on 9)

The polyamide film mill roll according to claim 9, wherein an oxygen permeability of the biaxially oriented polyamide film is 60 to 140 ml/m2·day·MPa.

### Claim 11 (depends on 10)

The polyamide film mill roll according to claim 10, wherein a strain at thermal shrinkage, after heating for ten minutes at 160° C., of the film at each of the positions that are inward by 300 mm from the right end and the left end in the transverse direction of the polyamide film mill roll is not higher than 2.0%.

### Claim 12 (depends on 11)

The polyamide film mill roll according to claim 11, wherein, in the biaxially oriented polyamide film, a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on at least one surface of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 13 (depends on 12)

The polyamide film mill roll according to claim 12, wherein, in the biaxially oriented polyamide film, a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on each of both surfaces of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 14 (depends on 9)

The polyamide film mill roll according to claim 9, wherein a strain at thermal shrinkage, after heating for ten minutes at 160° C., of the film at each of the positions that are inward by 300 mm from the right end and the left end in the transverse direction of the polyamide film mill roll is not higher than 2.0%.

### Claim 15 (depends on 9)

The polyamide film mill roll according to claim 9, wherein, in the biaxially oriented polyamide film, a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on at least one surface of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).

### Claim 16 (depends on 9)

The polyamide film mill roll according to claim 9, wherein, in the biaxially oriented polyamide film, a layer formed of a polyamide resin containing not lower than 60% by mass of polyamide 6 is laminated on each of both surfaces of the layer formed of the polyamide resin containing not lower than 60% by mass of poly(m-xylylene adipamide).