[특허]Packaging films comprising nylon blend compositions

Packaging films comprising nylon blend compositions 원문보기

IPC분류정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	B32B-027/08 B65B-053/02
출원번호	US-0791901 (2005-12-09)
등록번호	US-8741433 (2014-06-03)
국제출원번호	PCT/US2005/044715 (2005-12-09)
§371/§102 date	20070530 (20070530)
국제공개번호	WO2006/063283 (2006-06-15)
발명자 / 주소	Schell, Thomas Andrew Peterka, Matt C.
출원인 / 주소	Curwood, Inc.
대리인 / 주소	Parsons, Christine E.
인용정보	피인용 횟수 : 0 인용 특허 : 104

초록

Compositions and packaging films are provided having a blend of an amorphous nylon copolymer, a low temperature polyamide, and a high temperature polyamide. The compositions can be used in making heat shrinkable films and food packages having desirable levels of free shrink.

대표청구항 ▼

1. A multilayer heat-shrinkable packaging film having an interior surface and an exterior surface, the film comprising: a first outer layer forming at least a portion of the exterior surface, wherein the first outer layer comprises a blend of between about 5% and about 50% by weight of the blend of an amorphous nylon copolymer; between about 5% and about 50% by weight of the blend of a low temperature polyamide having a melting point of less than 155° C.; and between about 5% and about 80% by weight of the blend of a high temperature polyamide having a melting point of at least 155° C.;a second layer that is a sealant layer forming at least a portion of the interior surface, wherein the second layer comprises an ethylene-alpha-olefin;an oxygen barrier layer positioned between the first outer layer and the second layer;a first adhesive layer positioned between and in direct contact with each of the first outer layer and the oxygen barrier layer; anda second adhesive layer positioned between and in direct contact with each of the oxygen barrier layer and the second layer;wherein the film has a total free shrink value at 90° C. of at least 80%. 2. The film of claim 1, wherein the film has a total free shrink value at 90° C. of at least 95%. 3. The film of claim 1, wherein the film has a free shrink value at 90° C. of at least 40% in both the machine direction and the transverse direction. 4. The film of claim 1, wherein the amorphous nylon copolymer comprises nylon 6I/6T, nylon 66/6I/69 or nylon 66/6I/6T copolymer. 5. The film of claim 1, wherein the low temperature polyamide is nylon 6/69 copolymer. 6. The film of claim 1, wherein the high temperature polyamide is nylon 6, nylon 6/66 or nylon 6/12 copolymer. 7. A multilayer heat-shrinkable packaging film having an interior surface defining a pouch for containing food and an exterior surface, the film comprising: a heat resistant layer forming at least a portion of the exterior surface, the heat resistant layer comprising a blend consisting essentially of between about 5 and about 50% weight percent of the blend of an amorphous nylon copolymer, between about 5 and about 50% weight percent of the blend of a low temperature polyamide having a melting point of less than about 155° C., and between about 5% and about 80% of weight percent of the blend of a high temperature polyamide having a melting point of at least about 155° C.;a sealant layer forming at least a portion of the interior surface, the sealant layer comprising an ethylene-alpha-olefin;a core oxygen barrier layer positioned between the heat resistant layer and the sealant layer;a first adhesive layer positioned between and in direct contact with each of the heat resistant layer and the oxygen barrier layer; anda second adhesive layer positioned between and in direct contact with each of the oxygen barrier layer and the sealant layer;wherein the film has a total free shrink value at 90° C. of at least 80%. 8. The film of claim 7, wherein the high temperature polyimide is nylon 6. 9. The film of claim 7, wherein the film has 5 coextruded layers. 10. The film of claim 7, wherein the oxygen barrier layer comprises EVOH. 11. The film of claim 7, wherein the oxygen barrier layer comprises PVDC. 12. The film of claim 7 wherein the film has 5 to 7 coextruded layers. 13. A food package having an interior surface and an exterior surface, the food package comprising a heat-shrinkable packaging film, the packaging film comprising: a heat resistant layer forming at least a portion of the exterior surface, wherein the heat resistant layer comprises a blend of between about 10 and about 30 weight percent of the blend of an amorphous nylon copolymer, between about 10 and about 50 weight percent of the blend of a low temperature polyamide having a melting point of less than about 155° C., and between about 30 and about 80 weight percent of the blend of a high temperature polyamide selected from nylon 6 or nylon 6/66;a sealant layer forming at least a portion of the interior surface, wherein the sealant layer comprises an ethylene-alpha-olefin;an oxygen barrier layer positioned between the heat resistant layer and the sealant layer;a first adhesive layer positioned between and in direct contact with each of the heat resistant layer and the oxygen barrier layer; anda second adhesive layer positioned between and in direct contact with each of the oxygen barrier layer and the sealant layer;wherein the heat resistant layer has a total free shrink value at 90° C. of at least 80%. 14. The food package of claim 13, wherein the package is a cook-in package. 15. The food package of claim 13, wherein the film has a total free shrink of between about 80% and about 120% measured at 90° C. 16. A method of manufacturing a multilayer heat-shrinkable packaging film having an interior surface and an exterior surface, the method comprising the step of co-extruding a first outer layer forming at least a portion of the exterior surface, wherein the first outer layer comprises a blend of between about 5% and about 50% by weight of the blend of an amorphous nylon copolymer; between about 5% and about 50% by weight of the blend of a low temperature polyamide having a melting point of less than 155° C.; and between about 5% and about 80% by weight of the blend of a high temperature polyamide having a melting point of at least 155° C.,a second layer that is a sealant layer forming at least a portion of the interior surface, wherein the second layer comprises an ethylene-alpha-olefin,an oxygen barrier layer positioned between the first outer layer and the second layer,a first adhesive layer positioned between and in direct contact with each of the first outer layer and the oxygen barrier layer; anda second adhesive layer positioned between and in direct contact with each of the oxygen barrier layer and the second layer;wherein the film has a total free shrink value at 90° C. of at least 80%.

이 특허에 인용된 특허 (104)

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IPC	Description
A	생활필수품
A62	인명구조; 소방(사다리 E06C)
A62B	인명구조용의 기구, 장치 또는 방법(특히 의료용에 사용되는 밸브 A61M 39/00; 특히 물에서 쓰이는 인명구조 장치 또는 방법 B63C 9/00; 잠수장비 B63C 11/00; 특히 항공기에 쓰는 것, 예. 낙하산, 투출좌석 B64D; 특히 광산에서 쓰이는 구조장치 E21F 11/00)
A62B-1/08	.. 윈치 또는 풀리에 제동기구가 있는 것

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Packaging films comprising nylon blend compositions 원문보기

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Packaging films comprising nylon blend compositions 원문보기

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