Multilayer plastic film, useful for packaging a cook-in foodstuff
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B32B-027/28
B32B-027/32
출원번호
US-0675976
(1996-07-05)
발명자
/ 주소
Idlas Scott Allan
출원인 / 주소
Viskase Corporation
대리인 / 주소
Richeson
인용정보
피인용 횟수 :
66인용 특허 :
23
초록▼
A multilayer, preferably biaxially oriented, film suitable for processing and/or packaging cook-in foods such as ham, roast beef and poultry having an excellent combination of oxygen barrier, heat seal and optical properties comprising at least five essential sequential layers with a first layer of
A multilayer, preferably biaxially oriented, film suitable for processing and/or packaging cook-in foods such as ham, roast beef and poultry having an excellent combination of oxygen barrier, heat seal and optical properties comprising at least five essential sequential layers with a first layer of a copolymer of propene and at least one C.sub.2 -C.sub.8 .alpha.-olefin having a propene content of at least 60 wt. % and preferably having a melting point <140 .degree. C.; a second layer of (1) a first copolymer of ethylene and at least one C.sub.4 -C.sub.8 .alpha.-olefin having a density of from 0.900 to 0.915 g/cm.sup.3 and a melt index of less than 1.0 dg/min., (2) a second copolymer of ethylene with from 4 to 18%, preferably 4 to 12%, of a vinyl ester or alkyl acrylate, (3) an anhydride-modified third copolymer of ethylene with at least one .alpha.-olefin, a vinyl ester or an alkyl acrylate, and (4) optionally a fourth copolymer of ethylene and at least one C.sub.3 -C.sub.8 .alpha.-olefin having a density less than 0.900 g/cm.sup.3 and a melting point less of less than 85.degree. C.; a third EVOH layer; a fourth layer like the second layer; and a fifth layer of a first copolymer of ethylene with at least one C.sub.4 -C.sub.8 .alpha.-olefin having a density of from 0.900 to 0.915 g/cm.sup.3 and a melt index of less than 1.0 dg/min., and a second copolymer of ethylene with from 4 to 18%, preferably 4 to 12%, of a vinyl ester or alkyl acrylate, and optionally a third copolymer of ethylene and at least one C.sub.3 -C.sub.8 .alpha.-olefin having a density less than 0.900 g/cm.sup.3 and a melting point less of less than 85.degree. C.
대표청구항▼
[ What is claimed is:] [1.] A multilayer packaging film having at least five layers arranged in sequence and in contact with one another comprising:a first layer comprising at least 50% by weight of a copolymer of propene and at least one .alpha.-olefin selected from the group consisting of ethylene
[ What is claimed is:] [1.] A multilayer packaging film having at least five layers arranged in sequence and in contact with one another comprising:a first layer comprising at least 50% by weight of a copolymer of propene and at least one .alpha.-olefin selected from the group consisting of ethylene, butene-1, methylpentene-1, hexene-1, octene-1 and mixtures thereof having a propene content of at least 60 wt. %;second and fourth layers each comprising at least 10 wt. % of a first copolymer of ethylene and at least one C.sub.4 -C.sub.8 .alpha.-olefin, said copolymer having a density of from 0.900 to 0.915 g/Cm.sup.3 and a melt index of less than 1.0 dg/min., and at least 10 wt. % of a second copolymer of ethylene with from 4 to 18 wt. % of a vinyl ester or alkyl acrylate, and, and at least 10 wt. % of an anhydride-modified third copolymer of ethylene with at least one .alpha.-olefin, a vinyl ester or an alkyl acrylate, and from 0 to 30 wt. % of a fourth copolymer of ethylene and at least one C.sub.3 C.sub.8 .alpha.-olefin having a density less than 0.900 g/Cm.sup.3 and a melting point less of less than 85.degree. C.;a third layer comprising at least 80% by weight EVOH copolymer having an ethylene content of at least 38 mole %; anda fifth layer comprising at least 30 wt. % of a first copolymer of ethylene with at least one C.sub.4 -C.sub.8 .alpha.-olefin, said first copolymer having a density of from 0.900 to 0.915 g/cm.sup.3 and a melt index of less than 1.0 dg/min., and at least 10% of a second copolymer of ethylene with from 4 to 18% of a vinyl ester or alkyl acrylate, and from 0 to 30% of a third copolymer of ethylene and at least one C.sub.3 -C.sub.8 .alpha.-olefin having a density less than 0.900 g/cm.sup.3 and a melting point less of less than 85.degree. C.
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이 특허에 인용된 특허 (23)
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Oberle Timothy T. (Lyman SC) Schirmer Henry G. (Spartanburg SC) Bornstein Norman D. (Spartanburg SC) Walters Johnnie J. (Greer SC), Pasteurizable, cook-in shrink film.
Lustig Stanley (Park Forest IL) Mack Nancy M. (Chicago IL) Schuetz Jeffrey M. (Woodridge IL) Vicik Stephen J. (Darien IL), Puncture resistant, heat-shrinkable films containing very low density polyethylene.
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Douglas, Michael J.; Buelow, Duane H.; Mueller, Chad D.; Blemberg, Robert J.; Castellani, Roberto P., Multilayer barrier structures, methods of making the same and packages made therefrom.
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