US4565738A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple-layer polyolefin films
Assignee: Imperial Chemical Industries Ltd
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Filing: 1984-05-22
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Granted: 1986-01-21
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Expires: 2004-05-22
Abstract
Abstract A composite multiple-layer film, suitable as a packaging film, having a base layer of a propylene polymer and at least one surface layer formed from a blend of a propylene-ethylene block copolymer and an ethylene-higher olefin random copolymer. The composite film is preferably coextruded and is suitable as a substrate for additional polymeric layer(s), such as heat-sealable coatings, which may be adhered to the substrate by a polymeric primer resin.
Inventors
- 👤 John R. Purdy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:18
CPC Classifications
B; B32; B32B; B32B27/00; B32B27/32; B32B27/06; B32B27/08; B32B2270/00; B32B2323/00; B32B2323/10; Y; Y10; Y10T; Y10T428/00; Y10T428/28; Y10T428/2813; Y10T428/2817; Y10T428/2826; Y10T428/31504; Y10T428/31855; Y10T428/31909; Y10T428/31913; Y10T428/31928; Y10T428/31935
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
117 words
A multiple-layer film comprising a polyolefin base layer and, on at least one surface thereof, a receptive layer wherein the polyolefin of the base layer comprises a propylene polymer and the at least one receptive layer comprises a blend of (a) a propylene-ethylene end block copolymer containing from 1 to 20% of ethylene by weight of the end block copolymer, and (b) an ethylene-monoalphaolefin random copolymer containing from 1 to 15% by weight of the random copolymer of a monoalphaolefin the molecule of which contains from 3 to 10 carbon atoms, the weight ratio of the propylene-ethylene end block copolymer to the ethylene-monoalphaolefin random copolymer in the blend being within a range of from 0.5:1 to 99:1.
Claim 2
Dependent Claim
117 words
A multiple-layer film comprising a polyolefin base layer and, on at least one surface thereof, a receptive layer wherein the polyolefin of the base layer comprises a propylene polymer and the at least one receptive layer comprises a blend of (a) a propylene-ethylene end block copolymer containing from 1 to 20% of ethylene by weight of the end block copolymer, and (b) an ethylene-monoalphaolefin random copolymer containing from 1 to 15% by weight of the random copolymer of a monoalphaolefin the molecule of which contains from 3 to 10 carbon atoms, the weight ratio of the propylene-ethylene end block copolymer to the ethylene-monoalphaolefin random copolymer in the blend being within a range of from 0.5:1 to 99:1.
Claim 3
Dependent Claim
18 words
A multiple-layer film according to claim 1 wherein the polyolefin of the base layer comprises a propylene homopolymer.
Claim 4
Dependent Claim
12 words
A multiple-layer film according to claim 1 wherein the monoalphaolefin is butene-1.
Claim 5
Dependent Claim
34 words
A multiple-layer film according to claim 1 wherein the weight ratio of the propylene-ethylene end block copolymer to the ethylene-monoalphaolefin random copolymer in the blend is within a range of from 0.1:1 to 4:1.
Claim 6
Dependent Claim
18 words
A multiple-layer film according to claim 1 comprising a base layer and at least one coextruded receptive layer.
Claim 7
Dependent Claim
21 words
A multiple-layer film according to claim 1 wherein the at least one receptive layer has been subjected to a surface-modifying treatment.
Claim 8
Dependent Claim
21 words
A multiple-layer film according to claim 1 comprising a polymeric additional coating layer associated with the at least one receptive layer.
Claim 9
Dependent Claim
17 words
A multiple-layer film according to claim 7 wherein the additional coating layer comprises a vinylidene chloride-acrylonitrile copolymer.
Claim 10
Dependent Claim
27 words
A multiple-layer film according to claim 7 wherein the additional coating layer is bonded to the at least one receptive layer by an adhesion-promoting anchor coating resin.
Claim 11
Dependent Claim
29 words
A multiple-layer film according to claim 9 wherein the anchor coating resin comprises an interpolymerised condensation resin derived from a monoaldehyde, (meth) acrylamide and at least one unsaturated monomer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-01-20 | 1989-07-22 | 1990-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-01-20 | 1993-07-22 | 1994-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-01-20 | 1997-07-22 | 1998-01-21 | $7700.00 | Window Closed / Lapsed |