US4792581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rubber composition
Assignee: Denka Co Ltd
•
Filing: 1986-12-29
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Granted: 1988-12-20
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Expires: 2006-12-29
Abstract
Abstract A rubber composition comprising a crosslinked blend containing a mixture of from 50 to 95% by weight of an acrylic elastomer and from 5 to 50% by weight of polyethylene is disclosed. The composition has improved resistance to fuel oil, particularly alcohol-added gasoline, as well as cold temperature resistance and heat resistance, and is, therefore, useful as a fuel oil resistant material.
Inventors
- 👤 Takeo Kondo
- 👤 Yuichiro Kushida
- 👤 Yasushi Abe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:14
CPC Classifications
C; C08; C08L; C08L33/00; C08L33/04; C08L33/06; C08L33/08; C08L33/14; C08L23/00; C08L23/02; C08L23/04; C08L23/06
Claims Analysis
Total Claims: 30
Claim 1
Independent Claim
58 words
A rubber composition comprising a cross-linked blend containing a mixture of from 50 to 95% by weight of an acrylic elastomer, from 5 to 50% by weight of polyethylene and carbon black in an amount of from about 40 to 300 parts by weight per 100 parts by weight of the total amount of acrylic elastomer and polyethylene.
Claim 2
Dependent Claim
58 words
A rubber composition comprising a cross-linked blend containing a mixture of from 50 to 95% by weight of an acrylic elastomer, from 5 to 50% by weight of polyethylene and carbon black in an amount of from about 40 to 300 parts by weight per 100 parts by weight of the total amount of acrylic elastomer and polyethylene.
Claim 3
Dependent Claim
21 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains at least 60% by weight of an acrylic ester.
Claim 4
Dependent Claim
15 words
A rubber composition as in claim 2, wherein said acrylic ester is an alkoxyalkyl acrylate.
Claim 5
Dependent Claim
14 words
A rubber composition as in claim 3, wherein said alkoxyalkyl acrylate is 2-methoxyethyl acrylate.
Claim 6
Dependent Claim
49 words
A further composition as in claim 2, wherein said acrylic elastomer is a polymer of an acrylic ester, or a copolymer of an acrylic ester, and at least one comonomer selected from the group consisting of an α-olefin, acrylonitrile, a carboxylic acid vinyl ester, and an aromatic vinyl compound.
Claim 7
Dependent Claim
51 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains from 60 to 90% by weight of an alkoxyalkyl acrylate, not more than 15% by weight of ethylene, not more than 40% by weight of a carboxylic acid vinyl ester, and not more than 40% by weight of acrylonitrile.
Claim 8
Dependent Claim
43 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains from 60 to 90% by weight of an alkoxyalkyl acrylate, not more than 15% by weight of ethylene, and not more than 40% by weight of a carboxylic acid vinyl ester.
Claim 9
Dependent Claim
31 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains not less than 60% by weight of an alkoxyalkyl acrylate, and not more than 40% by weight of acrylonitrile.
Claim 10
Dependent Claim
19 words
A rubber composition as in claim 3, wherein said acrylic elastomer contains 100% by weight of an alkoxyalkyl acrylate.
Claim 11
Dependent Claim
43 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains from 75 to 89% by weight of an alkoxyalkyl acrylate, from 1 to 5% by weight of ethylene, and not more than 20% by weight of a carboxylic acid vinyl ester.
Claim 12
Dependent Claim
31 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains from 90 to 97% by weight of an alkoxyalkyl acrylate, and from 3 to 10% by weight of acrylonitrile.
Claim 13
Dependent Claim
35 words
A rubber composition as in claim 1, wherein said acrylic elastomer contains from 90 to 95% by weight of an alkoxyalkyl acrylate, and from 5 to 10% by weight of a carboxylic acid vinyl ester.
Claim 14
Dependent Claim
16 words
A rubber composition as in claim 6, wherein said carboxylic acid vinyl ester is vinyl acetate.
Claim 15
Dependent Claim
16 words
A rubber composition as in claim 7, wherein said carboxylic acid vinyl ester is vinyl acetate.
Claim 16
Dependent Claim
16 words
A rubber composition as in claim 10, wherein said carboxylic acid vinyl ester is vinyl acetate.
Claim 17
Dependent Claim
16 words
A rubber composition as in claim 12, wherein said carboxylic acid vinyl ester is vinyl acetate.
Claim 18
Dependent Claim
27 words
A rubber composition as n claim 1, wherein said polyethylene has crystallinity to an extent that it is not to be soluble in toluene at 40° C.
Claim 19
Dependent Claim
18 words
A rubber composition as in claim 1, wherein said polyethylene has a specific gravity of 0.89 or more.
Claim 20
Dependent Claim
21 words
A rubber composition as in claim 18, wherein said polyethylene is selected from medium-density polyethylene, low-density polyethylene, and linear low-density polyethylene.
Claim 21
Dependent Claim
59 words
A rubber composition as in claim 1, wherein said crosslinked blend further contains from 1 to 10 parts by weight of a peroxide, from 0.1 to 3 parts by weight of a radical scavenger, and from 0.1 to 5 parts by weight of a thiourea derivative per 100 parts by weight of the mixture of acrylic elastomer and polyethylene.
Claim 22
Dependent Claim
13 words
A rubber composition as in claim 20, wherein said radical scavenger is phenothiazine.
Claim 23
Dependent Claim
13 words
A rubber composition as in claim 20, wherein said thiourea derivative is trimethylthiourea.
Claim 24
Dependent Claim
43 words
A rubber composition as in claim 1, wherein said crosslinked blend further contains a plasticizer in an amount less than twice the weight of the polyethylene, said plasticizer being selected from butyl rubber, and polybutene having a molecular weight of less than 100,000.
Claim 25
Dependent Claim
29 words
A rubber composition as in claim 2, wherein said acrylic elastomer further contains a crosslinkable component as a comonomer in an amount of not more than 5% by weight.
Claim 26
Dependent Claim
21 words
A rubber composition as in claim 24, wherein said crosslinkable component is glycidyl methacrylate, allyl glycidyl ether, or the mixture thereof.
Claim 27
Dependent Claim
39 words
A rubber composition as in claim 24, wherein said crosslinked blend further contains an amine compound in an amount not more than 5 parts by weight per 100 parts by weight of the mixture of acrylic elastomer and polyethylene.
Claim 28
Dependent Claim
10 words
A hose prepared from the crosslinked blend of claim 1.
Claim 29
Dependent Claim
10 words
A diaphragm prepared from the crosslinked blend of claim 1.
Claim 30
Dependent Claim
38 words
A rubber composition as in claim 1, wherein said carbon black is contained in an amount of from 40 to 65 parts by weight per 100 parts by weight of the total amount of acrylic elastomer and polyethylene.
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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) | 1991-12-20 | 1992-06-20 | 1992-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-20 | 1996-06-20 | 1996-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-20 | 2000-06-20 | 2000-12-20 | $7700.00 | Window Closed / Lapsed |