US4387185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cracked blend of propylene copolymer and E/VA
Assignee: Union Carbide Chemicals and Plastics Technology LLC
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Filing: 1982-06-24
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Granted: 1983-06-07
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Expires: 2002-06-24
Abstract
Abstract A new composition for the heat-sealable layer in a retort-sterilizable pouch is disclosed. The new composition is the cracked product of the blend of a poly(propylene-ethylene) copolymer and an ethylene-vinyl acetate copolymer. This composition has improved flow properties and may be extrusion-coated onto a metal film substrate at high speeds.
Inventors
- 👤 Carl W. Schroeder
- 👤 Joseph R. Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 03:40
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/10; C08L23/14; C08L23/142; B; B32; B32B; B32B15/00; B32B15/04; B32B15/08; C09; C09J; C09J123/00; C09J123/02; C09J123/10; C09J123/14; C09J123/142; C08L23/04; C08L23/08; C08L23/0846; C08L23/0853; C08L23/18; C08L23/20; C08L2312/00; C08L2666/00; C08L2666/02; C08L2666/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
119 words
A composition having improved flow properties comprising the cracked product of a blend of a polypropylene copolymer and an ethylene-vinyl acetate copolymer wherein: (a) the melt flow of said cracked product is between about 15 and about 65 grams per 10 minutes, condition L; (b) said polypropylene copolymer is a propylene-ethylene copolymer comprising between about 1 and about 10 percent by weight ethylene and has a melt of between about 0.5 and about 15 grams per 10 minutes, condition L; and (c) said ethylene-vinyl acetate copolymer has a vinyl acetate content of between about 15 and about 30 percent by weight, and has a melt flow of between about 1 and about 30 grams per 10 minutes, condition E.
Claim 2
Dependent Claim
119 words
A composition having improved flow properties comprising the cracked product of a blend of a polypropylene copolymer and an ethylene-vinyl acetate copolymer wherein: (a) the melt flow of said cracked product is between about 15 and about 65 grams per 10 minutes, condition L; (b) said polypropylene copolymer is a propylene-ethylene copolymer comprising between about 1 and about 10 percent by weight ethylene and has a melt of between about 0.5 and about 15 grams per 10 minutes, condition L; and (c) said ethylene-vinyl acetate copolymer has a vinyl acetate content of between about 15 and about 30 percent by weight, and has a melt flow of between about 1 and about 30 grams per 10 minutes, condition E.
Claim 3
Dependent Claim
25 words
The composition according to claim 1 wherein the melt flow of said cracked product is between about 15 and about 50 grams per 10 minutes.
Claim 4
Dependent Claim
25 words
The composition according to claim 2 wherein said polypropylene copolymer is a random copolymer comprising between about 1 and about 10 percent by weight ethylene.
Claim 5
Dependent Claim
15 words
The composition according to claim 1 wherein said cracked product is prepared by peroxide cracking.
Claim 6
Dependent Claim
13 words
The composition according to claim 4 wherein said peroxide is an aliphatic peroxide.
Claim 7
Dependent Claim
34 words
The composition according to claim 1 wherein said blend comprises between about 5 and about 25 percent by weight ethylene-vinyl acetate copolymer and between about 95 and about 75 percent by weight polypropylene copolymer.
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) | 1986-06-06 | 1986-12-06 | 1987-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-06-06 | 1990-12-06 | 1991-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-06-06 | 1994-12-06 | 1995-06-07 | $7700.00 | Window Closed / Lapsed |