US2012028065A1PendingUtilityA1

Collation shrinkage film having excellent clarity and superior toughness

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Assignee: BAFNA AYUSH APriority: Mar 31, 2009Filed: Mar 26, 2010Published: Feb 2, 2012
Est. expiryMar 31, 2029(~2.7 yrs left)· nominal 20-yr term from priority
Inventors:Ayush A. BafnaMehmet DemirorsXiao Bing YunChang WuDanielle LeeJoy Guo-Hui Wang
C08L 23/06C08L 23/0815C08J 5/18C08F 4/632C08F 210/16Y10T428/31938B32B 27/32Y10T428/31913C08F 2410/04C08F 4/6224C08F 2500/12C08F 2810/20C08L 23/08C08F 2500/02C08F 2500/26C08F 2500/08C08L 23/04
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Claims

Abstract

A multilayer film structure comprising at least three layers, wherein at least one layer comprises ethylene and at least one alpha-olefin is claimed, wherein the ethylene interpolymer is characterized as having an average M v and a valley temperature between the interpolymer and high crystalline fraction, T hc , such that the average M v for a fraction above T hc from ATREF divided by average M v of the whole polymer from ATREF (M hc /M hp ) is less then about 1.95 and wherein the interpolymer has a CDBI of less than 60%. The interpolymer of ethylene and at least one alpha-olefin can also be characterized as having a high density (HD) fraction and an overall density such that % HD fraction<0.0168x 2 −29.636x+13036 where x is the density in grams/cubic centimeter.

Claims

exact text as granted — not AI-modified
1 . A multilayer film structure comprising at least three layers, wherein at least one layer comprises an interpolymer of ethylene and at least one alpha-olefin, characterized wherein the interpolymer has an average M v  and a valley temperature between the interpolymer and high crystalline fraction, T hc , such that the average M v  for a fraction above T hc  from ATREF divided by average M v  of the whole polymer from ATREF (M hc /M hp ) is less than about 1.95 and wherein the interpolymer has a CDBI of less than 60%. 
     
     
         2 . The film structure of  claim 1  comprising a core layer and two skin layers, wherein the skin layers comprise the interpolymer, and wherein the core layer comprises LDPE. 
     
     
         3 . The film structure of  claim 2  wherein the LDPE has a melt index of less than 1 g/10 minutes. 
     
     
         4 . The film structure of  claim 2  wherein each skin layer further comprises another thermoplastic polymer. 
     
     
         5 . The film structure of  claim 1  wherein said interpolymer has a CDBI of less than 55%. 
     
     
         6 . The film structure of  claim 1  wherein said interpolymer has a M hc /M hp  of less than about 1.7. 
     
     
         7 . A multilayer film structure comprising at least three layers, wherein at least one layer comprises ethylene and at least one alpha-olefin wherein the interpolymer is characterized as having a high density (HD) fraction and an overall density such that % HD fraction<0.0168x 2 −29.636x+13036 where x is the overall density in grams/cubic centimeter. 
     
     
         8 . The film structure of  claim 7  comprising a core layer and two skin layers, wherein the skin layers comprise the interpolymer, and wherein the core layer comprises the LDPE. 
     
     
         9 . The film structure of  claim 7  wherein the LDPE has a melt index of less than 1 g/10 minutes. 
     
     
         10 . The film structure of  claim 8  wherein each skin layer further comprises another thermoplastic polymer. 
     
     
         11 . The film structure of  claim 7  wherein said interpolymer has a CDBI of less than 55%. 
     
     
         12 . The film structure of  claim 7  wherein said interpolymer has a Mhc/Mhp of less than about 1.7.

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