Patent US4426498A successfully refreshed from Google Patents.
US4426498A
Expired / Lapsed
US
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Polyethylene composition comprising lldpe and rubber
Assignee: Tonen General Sekiyu KK
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Filing: 1982-03-18
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Granted: 1984-01-17
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Expires: 2002-03-18
Abstract
Abstract An improved polyethylene composition is disclosed. The composition comprises linear low density polyethylene (an ethylene/alpha-olefin copolymer) and a synthetic rubber. In one embodiment the composition includes a synthetic rubber reacted with a carboxylic acid.
Inventors
- 👤 Hiroshi Inoue
- 👤 Masaaki Isoi
- 👤 Kazuo Sei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:11
CPC Classifications
C; C08; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/08; C08L23/0807; C08L23/0815; C08L2203/00; C08L2203/20; C08L2203/202; C08L2205/00; C08L2205/02
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
60 words
A polyethylene composition which comprises: (a) from 70 to 98 parts by weight of linear low density polyethylene comprising a copolymer of ethylene and an alpha-olefin having a density of 0.915 to 0.935 and Mw/Mn ratio of 3 to 12; and (b) from 2 to 30 parts by weight of an ethylene-butene-1 copolymer rubber having a density lower than 0.9.
Claim 2
Dependent Claim
60 words
A polyethylene composition which comprises: (a) from 70 to 98 parts by weight of linear low density polyethylene comprising a copolymer of ethylene and an alpha-olefin having a density of 0.915 to 0.935 and Mw/Mn ratio of 3 to 12; and (b) from 2 to 30 parts by weight of an ethylene-butene-1 copolymer rubber having a density lower than 0.9.
Claim 3
Dependent Claim
96 words
A thermoplastic coating composition for wire, cable or pipe which exhibits improved environmental stress cracking resistance, said coating comprising: (a) from 70 to 98 parts by weight linear low density polyethylene comprising a copolymer of ethylene and an alpha-olefin and having a density of 0.915 to 0.935 and Mw/Mn ratio of 3 to 12; said alpha-olefin constituting from 3 to 14 weight percent of the copolymer and being selected from butene-1, pentene-1, hexene-1, heptene-1, octene-1, and 4-methylpentene; (b) from 2 to 30 parts by weight of an ethylene-butene-1 copolymer rubber having a density lower than 0.9.
Claim 4
Dependent Claim
96 words
A thermoplastic coating composition for wire, cable or pipe which exhibits improved environmental stress cracking resistance, said coating comprising: (a) from 70 to 98 parts by weight linear low density polyethylene comprising a copolymer of ethylene and an alpha-olefin and having a density of 0.915 to 0.935 and Mw/Mn ratio of 3 to 12; said alpha-olefin constituting from 3 to 14 weight percent of the copolymer and being selected from butene-1, pentene-1, hexene-1, heptene-1, octene-1, and 4-methylpentene; (b) from 2 to 30 parts by weight of an ethylene-butene-1 copolymer rubber having a density lower than 0.9.
Claim 5
Dependent Claim
30 words
A composition as set forth in claim 1, in which the alpha-olefin is an olefin selected from the group consisting of butene-1 pentene 1, hexene-1 heptene 1, 4-methylpentene-1, and octene-1.
Claim 6
Dependent Claim
33 words
A composition as defined in claim 1, wherein the synthetic rubber is reacted with from 0.01 to 3.0 weight percent of carboxylic acid or derivative thereof in the presence of an organic peroxide.
Claim 7
Dependent Claim
20 words
A composition as defined in claim 2, wherein the copolymer comprises from 3 to 14 weight percent of the alpha-olefin.
Claim 8
Dependent Claim
18 words
The composition of claim 3 wherein the linear low density polyethylene is produced by a low pressure process.
Claim 9
Dependent Claim
17 words
The composition of claim 6 wherein the linear low density polyethylene produced by a gas phase process.
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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) | 1987-01-16 | 1987-07-18 | 1988-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-16 | 1991-07-18 | 1992-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-16 | 1995-07-18 | 1996-01-17 | $7700.00 | Window Closed / Lapsed |