EP0365463A2
Expired / Lapsed
EP
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Coextruded matte film
Assignee: Georgia Pacific Consumer Products LP
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Filing: 1989-08-17
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Granted: —
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Expires: 2009-08-17
Abstract
Abstract A coextruded film having a matte surface layer is prepared by forming the layer from a blend of polyisobutylene and high density polyethylene. The film preferably has a heatseal layer on the other surface. In addition to having low gloss for consumer appeal, the matte surface layer has a medium coefficient of friction for good machinablility and excellent heat resistance to facilitate heatsealing. The film is especially useful as an overwrap for packaging consumer products.
Inventors
- 👤 Jimmy S. Dew
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:25
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/31; B32B2307/40; B32B2307/408; B32B2307/50; B32B2307/554; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A coextruded film having a nonembossed matte surface layer having a gloss of less than ten percent, characterized in that the matte surface layer consists essentially of a blend of from about ten to forty percent polyisobutylene, fifty to ninety percent high density polyethylene, and zero to forty percent propylene homopolymer, the polyisobutylene having a molecular weight of at least 50,000.
Claim 2
Dependent Claim
61 words
A coextruded film having a nonembossed matte surface layer having a gloss of less than ten percent, characterized in that the matte surface layer consists essentially of a blend of from about ten to forty percent polyisobutylene, fifty to ninety percent high density polyethylene, and zero to forty percent propylene homopolymer, the polyisobutylene having a molecular weight of at least 50,000.
Claim 3
Dependent Claim
23 words
The film of claim 1 characterized in having a coefficient of friction between the matte surface layers of between about 0.2 and 0.7.
Claim 4
Dependent Claim
18 words
The film of claim 2 characterized in that the coefficient of friction is between about 0.3 and 0.5.
Claim 5
Dependent Claim
15 words
The film of claim 3 characterized in having a heatseal layer on the opposite surface.
Claim 6
Dependent Claim
43 words
The film of claim 4 characterized in that the matte surface layer has excellent heat resistance, whereby the heatseal layer may be heatsealed to itself using heatseal jaws having a temperature of 260°C without having the jaws stick to the matte surface layer.
Claim 7
Dependent Claim
17 words
The film of claims 1-5 characterized in having a thickness of from about 1.0 and 3.0 mils.
Claim 8
Dependent Claim
22 words
The film of claim 6, characterized in that the thickness of the matte surface layer is between about 0.1 and 0.3 mil.
Claim 9
Dependent Claim
19 words
The film of claim 7 characterized in having three layers wherein the third layer is a polyolefin core layer.
References Cited (Backward Citations)
No citation records indexed.
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