EP0662989B1
Expired / Lapsed
EP
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Improved shrink film and methods relating thereto
Assignee: EIDP Inc
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Filing: 1993-10-01
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Granted: 1997-01-29
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Expires: 2013-10-01
Abstract
Abstract The present invention relates generally to shrink film compositions having improved properties, particularly improved shrink range, optics, toughness, (low) shrink force, (low) extractables and the like. More specifically, the improved shrink films of the present invention are directed to alloys or combinations comprising precise combinations of 'narrow, substantially singular' melting point polyethylene with a higher melting point (by at least about 10 °C), polyethylene.
Inventors
- 👤 Oscar Trini Garza, Jr.
- 👤 Timothy Michael Kneale
- 👤 John Douglas Snyder
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-01 04:41
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; C; C08; C08J; C08J5/00; C08J5/18; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; B32B2270/00; B32B2307/00; B32B2307/50; B32B2307/514; B32B2307/518; B32B2307/70; B32B2307/718; B32B2307/732; B32B2307/734; B32B2307/736; B32B2309/00; B32B2309/02; B32B2309/025; B32B2309/08; B32B2309/10; B32B2309/105; B32B2323/00; B32B2323/04; B32B2323/046; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/08; C08L23/06; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/13; Y10T428/131; Y10T428/1317; Y10T428/1321; Y10T428/1328; Y10T428/31504; Y10T428/31855; Y10T428/31909
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
109 words
An improved shrink film composition comprising: a) a polyethylene homopolymer or copolymer derived from at least 70 weight percent ethylene first component having a narrow, substantially singular melting point, said melting point being less than 115°C and said first component having a molecular weight distribution (Mw/Mn) within the range of 1 to 4 and a density less than 0.92 grams per cubic centimeter; and b) a polyethylene second component having a melting point at least 10°C greater than the first component and an orientation temperature at least 2°C less than its melting point, whereby the weight ratio of first component to second component is in the range of 2-98:98-2.
Claim 2
Dependent Claim
20 words
The composition of Claim 1 wherein the first component is the product of a polymerization process utilizing a metallocene catalyst.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein the second component is a blend of LDPE, LLDPE and VLDPE in a weight ratio of 2-25:50-98:0-25.
Claim 4
Dependent Claim
85 words
The composition of claim 1 wherein the first and second component are intermixed and the second component has a density of 0.915 to 0.930 grams per cubic centimeter and a melt index (according to ASTM D-1238, Condition E) of 0.5 to 2.0, and the first component has a density of 0.86 to 0.915 and a melt index (according to ASTM D-1238, Condition E) of 1.0 to 3, whereby the weight ratio of the second component to the first component is in the range of 50-90:10-50.
Claim 5
Dependent Claim
87 words
The composition of claim 1 wherein the first and second component are intermixed and the first component has a density of 0.86 to 0.915 grams per cubic centimeter and a melt index (according to ASTM D-1238, Condition E) of 0.5 to 2.0, and the second component has a density of 0.915 to 0.930 g/cm 3 and a melt index (according to ASTM D-1238, Condition E) of 1.0 to 10, whereby the weight ratio of the first component to the second component is in the range of 50-98:2-50.
Claim 6
Dependent Claim
87 words
The composition of claim 1 wherein the first and second component are intermixed and the second component has a density of 0.925 to 0.945 g/cm 3 and a melt index (according to ASTM D-1238, Condition E) of 0.5 to 1.5 and the first component has a density of 0.86 to 0.92 grams per cubic centimeter and a melt index (according to ASTM D-1238, Condition E) of 1 to 5, whereby the weight ratio of the second component to the first component is in the range of 15-35:65-85.
Claim 7
Dependent Claim
17 words
A multilayer composite shrink film structure wherein one of the layers comprise the composition of claim 1.
Claim 8
Dependent Claim
31 words
The multilayer structure of claim 7 wherein the core layer comprises the composition of claim 1 and said core layer is 40% to 95% of the total thickness ofthe multilayer film.
References Cited (Backward Citations)
No citation records indexed.
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