US5306558A
Expired / Lapsed
US
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Double-layered rubber laminate
Assignee: Shin-Etsu Chemical Co Ltd
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Filing: 1993-03-17
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Granted: 1994-04-26
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Expires: 2013-03-17
Abstract
Abstract An improved double-layered rubber laminate is proposed, which is an integral body consisting of a first layer of an organopolysiloxane-based rubber composition and a second layer of an acrylic rubber-based composition. When the acrylic rubber in the latter composition is not a conventional acrylic rubber but a copolymeric rubber of a (meth)acrylate ester monomer and an organosilicon monomer having, in a molecule, at least one silicon-bonded vinyl group and an ethylenically unsaturated group other than silicon-bonded vinyl groups, such as 3-methacryloxypropyl, very firm bonding can be obtained between the layers by the co-vulcanization of the laminated layers to exhibit very high resistance against delamination.
Inventors
- 👤 Masaharu Takahashi
- 👤 Tsutomu Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:45
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/04; B32B25/042; B32B25/20; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/259; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T428/31667
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
248 words
A double-layered rubber laminate which is an integral body consisting of (A) a first layer of a rubber which is a cured organopolysiloxane composition comprising (a) 100 parts by weight of an organopolysiloxane represented by the average unit formula R a SiO.sub.(4-a)/2, in which R is an unsubstituted or substituted monovalent hydrocarbon group and the subscript a is a positive number in the range from 1.95 to 2.05; (b) from 5 to 500 parts by weight of a finely divided silica powder having a specific surface area of at least 1 m 2 /g; and (c) from 0.1 to 5 parts by weight of a first organic peroxide; and (B) a second layer of a rubber which is a cured acrylic rubber-based composition comprising (d) 100 parts by weight of an acrylic rubber comprising a copolymer of from 99.99% to 90% by weight of the (meth)acrylate ester monomer and from 0.01% to 10% by weight of a vinyl silyl-containing monomer which has another ethylenically unsaturated group indirectly bonded to the silicon atom; (e) from 10 to 200 parts by weight of a reinforcing filler having a specific surface area of at least 30 m 2 /g; and (f) from 0.1 to 10 parts by weight of a second organic peroxide, the first and second rubber layers being integrally bonded to each other by curing a laminate consisting of a first layer of the organopolysiloxane composition before curing and a second layer of the acrylic rubber-based composition before curing.
Claim 2
Dependent Claim
248 words
A double-layered rubber laminate which is an integral body consisting of (A) a first layer of a rubber which is a cured organopolysiloxane composition comprising (a) 100 parts by weight of an organopolysiloxane represented by the average unit formula R a SiO.sub.(4-a)/2, in which R is an unsubstituted or substituted monovalent hydrocarbon group and the subscript a is a positive number in the range from 1.95 to 2.05; (b) from 5 to 500 parts by weight of a finely divided silica powder having a specific surface area of at least 1 m 2 /g; and (c) from 0.1 to 5 parts by weight of a first organic peroxide; and (B) a second layer of a rubber which is a cured acrylic rubber-based composition comprising (d) 100 parts by weight of an acrylic rubber comprising a copolymer of from 99.99% to 90% by weight of the (meth)acrylate ester monomer and from 0.01% to 10% by weight of a vinyl silyl-containing monomer which has another ethylenically unsaturated group indirectly bonded to the silicon atom; (e) from 10 to 200 parts by weight of a reinforcing filler having a specific surface area of at least 30 m 2 /g; and (f) from 0.1 to 10 parts by weight of a second organic peroxide, the first and second rubber layers being integrally bonded to each other by curing a laminate consisting of a first layer of the organopolysiloxane composition before curing and a second layer of the acrylic rubber-based composition before curing.
Claim 3
Dependent Claim
60 words
The double-layered rubber laminate as claimed in claim 1 in which the acrylic rubber as the component (d) is a copolymer of a (meth)acrylate ester monomer represented by the general formula CH 2 ═CR 1 --CO--O--R 2 , in which R 1 is a hydrogen atom or a methyl group and R 2 is an alkyl or alkoxy-substituted alkyl group.
Claim 4
Dependent Claim
37 words
The double-layered rubber laminate as claimed in claim 2 in which the ethylenically unsaturated group indirectly bonded to the silicon atom is selected from the group consisting of acryloxymethyl group, 3-methacryloxypropyl group, vinylphenyl group and 3-acrylamidopropyl group.
References Cited (Backward Citations)
US4147685A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-04-25 | 1997-10-25 | 1998-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-04-25 | 2001-10-25 | 2002-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-04-25 | 2005-10-25 | 2006-04-26 | $7700.00 | Window Closed / Lapsed |