Patent US2780281A successfully refreshed from Google Patents.
Patent US4421867A successfully refreshed from Google Patents.
US4421867A
Expired / Lapsed
US
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Composition for a crosslinked polyolefin foam
Assignee: Furukawa Electric Co Ltd
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Filing: 1982-03-16
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Granted: 1983-12-20
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Expires: 2002-03-16
Abstract
Abstract A composition for a crosslinked polyolefin foam is prepared from 20 to 75% by weight of a crystalline propylene copolymer containing 1 to 15% by weight of ethylene and having a crystallinity higher than 50% and 80 to 25% by weight of polyethylene.
Inventors
- 👤 Akio Nojiri
- 👤 Takashi Sawasaki
- 👤 Isamu Noguchi
- 👤 Shinji Onobori
- 👤 Junnosuke Sasazima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:13
CPC Classifications
C; C08; C08J; C08J9/00; C08J9/0061; C08J9/0014; C08J2323/00; C08J2323/02; C08J2423/00; Y; Y10; Y10S; Y10S521/00; Y10S521/915
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
80 words
A foamable composition for making a closed cell polyolefin foam which comprises 20 to 75% by weight of crystalline propylene copolymer having a melt index of 1 to 20 and containing 1 to 15% by weight of ethylene and having a crystallinity higher than 50%, 80 to 25% by weight of polyethylene having a density of from 0.920 to 0.945 g/cm 3 and a melt index of 1 to 10, a polyfunctional organic monomeric cross-linking agent and a blowing agent.
Claim 2
Dependent Claim
80 words
A foamable composition for making a closed cell polyolefin foam which comprises 20 to 75% by weight of crystalline propylene copolymer having a melt index of 1 to 20 and containing 1 to 15% by weight of ethylene and having a crystallinity higher than 50%, 80 to 25% by weight of polyethylene having a density of from 0.920 to 0.945 g/cm 3 and a melt index of 1 to 10, a polyfunctional organic monomeric cross-linking agent and a blowing agent.
Claim 3
Dependent Claim
24 words
The composition according to claim 1, wherein the propylene copolymer is a propylene-ethylene random copolymer which contains 2 to 9% by weight of ethylene.
Claim 4
Dependent Claim
19 words
The composition according to claim 1, wherein the polyethylene has a density of 0.923 to 0.937 g/cm 3 .
Claim 5
Dependent Claim
34 words
The composition according to claim 1, which comprises 30 to 70% by weight of the propylene-ethylene random copolymer containing 2 to 9% by weight of ethylene, and 70 to 30% by weight of polyethylene.
Claim 6
Dependent Claim
68 words
The composition of claim 1 to be irradiated for crosslinking and foamed which comprises 20 to 75% by weight of a propylene copolymer containing 1 to 15% by weight of ethylene, 80 to 25% by weight of polyethylene, 0.5 to 4 phr of triacrylate or trimethacrylate of aliphatic polyhydric alcohol, 0.5 to 30 phr of a blowing agent and 0.01 to 5 phr of a phenolic compound derivative.
Claim 7
Dependent Claim
23 words
The composition according to claim 5, wherein the propylene copolymer is a propylene-ethylene random copolymer containing 2 to 9% by weight of ethylene.
Claim 8
Dependent Claim
19 words
The composition according to claim 5, wherein the polyethylene has a density of 0.923 to 0.937 g/cm 3 .
Claim 9
Dependent Claim
63 words
The composition according to claim 5, which comprises 30 to 70% by weight of a propylene-ethylene random copolymer containing 2 to 9% by weight of ethylene, 70 to 30% by weight of polyethylene, 1.0 to 2.5 phr of triacrylate or trimethacrylate or aliphatic polyhydric alcohol, 0.5 to 30 phr of a blowing agent and 0.05 to 1.0 phr of a phenolic compound derivative.
Claim 10
Dependent Claim
82 words
A crosslinked polyolefin foam sheet having a closed cell structure which has been cross-linked using a polyfunctional organic monomeric cross-linking agent which comprises 20 to 75% by weight of a propylene copolymer having a melt index of 1 to 20 and containing 1 to 15% by weight of ethylene and having a crystallinity higher than 50% and 80 to 25% by weight of polyethylene having a melt index of 1 to 10 and a density of 0.920 to 0.945 g/cm 3 .
Claim 11
Dependent Claim
82 words
A crosslinked polyolefin foam sheet having a closed cell structure which has been cross-linked using a polyfunctional organic monomeric cross-linking agent which comprises 20 to 75% by weight of a propylene copolymer having a melt index of 1 to 20 and containing 1 to 15% by weight of ethylene and having a crystallinity higher than 50% and 80 to 25% by weight of polyethylene having a melt index of 1 to 10 and a density of 0.920 to 0.945 g/cm 3 .
Claim 12
Dependent Claim
31 words
The crosslinked polyolefin foam sheet having a closed cell structure according to claim 9, wherein the propylene copolymer is a propylene-ethylene random copolymer containing 2 to 9% by weight of ethylene.
Claim 13
Dependent Claim
27 words
The crosslinked polyolefin foam sheet having a closed cell structure according to claim 9, wherein the polyethylene has a density of 0.923 to 0.937 g/cm 3 .
Claim 14
Dependent Claim
49 words
The crosslinked polyolefin foam sheet having a closed cell structure according to claim 9, which comprises 30 to 70% by weight of a propylene-ethylene random copolymer containing 2 to 9% by weight of ethylene and having a crystallinity higher than 50%, and 70 and 30% by weight of polyethylene.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-12-19 | 1987-06-20 | 1987-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-12-19 | 1991-06-20 | 1991-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-12-19 | 1995-06-20 | 1995-12-20 | $7700.00 | Window Closed / Lapsed |