Patent US4896943B1 successfully refreshed from Google Patents.
US4267080A
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Polyethylene composition for rotational molding
Assignee: Asahi Kasei Corp
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Filing: 1979-09-28
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Granted: 1981-05-12
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Expires: 1999-09-28
Abstract
Abstract Polymers of ethylene having incorporated therein (1) 5-50 weight parts of a rubber and/or an elastomer based on 100 weight parts of the ethylene polymers, (2) a crosslinking agent selected from bis(tert. alkylperoxy)-alkane or bis(tert. alkylperoxy)benzene, and (3) 0.5-5 times by weight the amount of the crosslinking agent, of at least one cross-linking aid selected from 1,2-polybutadiene, triallyl cyanurate and triallyl isocyanurate, are rotationally molded to produce molded articles possessing good release characteristics as well as high impact strength and enhanced surface luster.
Inventors
- 👤 Takayuki Yokoyama
- 👤 Yoshiaki Nakayama
- 👤 Yasuo Yasuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:13
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/04; C08K5/14; C08F; C08F255/00; C08F255/02; C08L; C08L23/00; C08L23/02; C08L23/04; C08L23/06; C08L23/16; C08L2205/00; C08L2205/03; C08L23/08; C08L23/0807; C08L23/0815; C08L2312/00; C08L53/00; C08L53/02; C08L9/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
93 words
An ethylene polymer composition for rotational molding consisting essentially of (a) an ethylene polymer containing at least 85% by weight of ethylene, (b) 5 to 50% of an elastomer based on the weight of (a), (c) a crosslinking agent of the formula: ##STR3## wherein n is 1 or 2, R is a tertiary alkyl group, and R' and R" each independently is an alkyl group, and (d) 50 to 500% based on the weight of (c) of at least one crosslinking aid selected from group consisting of 1,2-polybutadiene, triallyl cyanurate and triallyl isocyanurate.
Claim 2
Dependent Claim
93 words
An ethylene polymer composition for rotational molding consisting essentially of (a) an ethylene polymer containing at least 85% by weight of ethylene, (b) 5 to 50% of an elastomer based on the weight of (a), (c) a crosslinking agent of the formula: ##STR3## wherein n is 1 or 2, R is a tertiary alkyl group, and R' and R" each independently is an alkyl group, and (d) 50 to 500% based on the weight of (c) of at least one crosslinking aid selected from group consisting of 1,2-polybutadiene, triallyl cyanurate and triallyl isocyanurate.
Claim 3
Dependent Claim
31 words
An ethylene polymer composition according to claim 1 wherein the amount of the elastomer is in the range of from 5 to 30% based on the weight of the ethylene polymer.
Claim 4
Dependent Claim
55 words
An ethylene polymer composition according to claim 1 wherein the elastomer is at least one member selected from the group consisting of natural rubber (NR), styrene-butadiene rubber (SBR), butadiene rubber (BR), acrylonitrile-butadiene rubber (NBR), chloroprene rubber (CR), isoprene rubber (IR), isobutylene isoprene rubber (IIR), chlorinated polyethylene, styrene-butadiene block-copolymer, styrene-isoprene block-copolymer and an ethylene-olefin copolymer elastomer.
Claim 5
Dependent Claim
37 words
An ethylene polymer composition according to claim 1 wherein R is a tertiary alkyl group having 4 to 8 carbon atoms and each of R' and R" is an alkyl group having 1 to 8 carbon atoms.
Claim 6
Dependent Claim
26 words
An ethylene polymer composition according to claim 1 wherein the crosslinking agent is at least one compound selected from the group consisting of 2,5-bis(tert.-butylperoxy)-2,5-dimethylhexane and α,α'-bis(tert.-butylperoxyisopropyl)benzene.
Claim 7
Dependent Claim
16 words
An ethylene polymer composition according to claim 1 or 2 wherein the crosslinking aid is 1,2-polybutadiene.
Claim 8
Dependent Claim
32 words
An ethylene polymer composition according to any one of claims 1, 2 and 3 wherein the elastomer is a copolymer derived from ethylene and an α-olefin having at least three carbon atoms.
Claim 9
Dependent Claim
37 words
An ethylene polymer composition according to claim 1 wherein the amount of the crosslinking agent is in the range of from 0.1 to 5 parts by weight based on 100 parts by weight of the ethylene polymer.
Claim 10
Dependent Claim
22 words
In a process for making a rotationally molded article, the improvement comprising rotationally molding the ethylene polymer composition according to claim 1.
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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) | 1984-05-11 | 1984-11-10 | 1985-05-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-11 | 1988-11-10 | 1989-05-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-11 | 1992-11-10 | 1993-05-12 | $7700.00 | Window Closed / Lapsed |