US5260123A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Block copolymers of polysiloxanes and copolymers of conjugated dienes and aromatic vinyl compounds, and multilayer structures containing same
Assignee: Bridgestone Corp
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Filing: 1991-06-28
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Granted: 1993-11-09
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Expires: 2011-06-28
Abstract
Abstract Block copolymers are described which comprise alternating blocks of (A) a polysiloxane; and (B) a copolymer of a 1,3-conjugated diene and a monovinyl aromatic compound. The block copolymers can be prepared by reacting a polysiloxane with a dilithiated copolymer of a conjugated diene and a monovinyl aromatic compound and thereafter neutralizing the reaction product with a protonic acid or a polyfunctional alkyl silane or silicon tetrachloride. Cured elastomer compositions exhibiting surface release characteristics are obtained by curing a mixture comprising the above-described block copolymer in the presence of a curing system comprising a peroxide and sulfur. Multilayer elastomer structures useful in manufacturing articles from elastomeric materials also are described wherein at least a portion of an outer layer of the multilayer elastomer structure has release characteristics and comprises the cured block copolymers of the present invention.
Inventors
- 👤 William L. Hergenrother
- 👤 Daniel F. Graves
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 20:02
CPC Classifications
B; B32; B32B; B32B25/00; B32B25/10; B32B5/00; B32B5/02; B32B5/022; B32B5/024; C; C08; C08G; C08G77/00; C08G77/42; C08G77/442; C08L; C08L83/00; C08L83/10; B32B2305/00; B32B2305/72; B32B2307/00; B32B2307/70; B32B2307/718; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31652; Y10T428/31663; Y10T442/00; Y10T442/30; Y10T442/3008; Y10T442/3016; Y10T442/3854; Y10T442/3911; Y10T442/60; Y10T442/601; Y10T442/602; Y10T442/674; Y10T442/679
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
78 words
A multilayer elastomer structure useful in manufacturing articles from elastomeric materials comprising a first outer layer, a second outer layer of rubber, and an intermediate layer of reinforcing material between said outer layers, wherein at least a portion of the first outer layer of the elastomer structure has release characteristics to uncured rubber and comprises a block copolymer comprising alternating blocks of (A) a polysiloxane; and (B) a copolymer of a conjugated diene and a monovinyl aromatic compound.
Claim 2
Dependent Claim
78 words
A multilayer elastomer structure useful in manufacturing articles from elastomeric materials comprising a first outer layer, a second outer layer of rubber, and an intermediate layer of reinforcing material between said outer layers, wherein at least a portion of the first outer layer of the elastomer structure has release characteristics to uncured rubber and comprises a block copolymer comprising alternating blocks of (A) a polysiloxane; and (B) a copolymer of a conjugated diene and a monovinyl aromatic compound.
Claim 3
Dependent Claim
23 words
The multilayer elastomer structure of claim 1 wherein the block copolymer comprises from about 10 to about 75% by weight of the polysiloxane.
Claim 4
Dependent Claim
12 words
The multilayer elastomer structure of claim 1 wherein the polysiloxane is polydimethylsiloxane.
Claim 5
Dependent Claim
15 words
A bladder, sleeve, bag, belt or ribbon comprising the multilayer elastomer structure of claim 3.
Claim 6
Dependent Claim
77 words
The multilayer elastomer structure of claim 1 wherein said portion of the first outer layer having release characteristics is a laminated structure comprising (1) an inner layer (32) of at least one cured rubber; (2) an intermediate layer (30) of at least one reinforcing material; and (3) an outer layer (28) of a cured block copolymer elastomer comprising alternating blocks of (A) a polysiloxane; and (B) a copolymer of a conjugated diene and a monovinyl aromatic compound.
Claim 7
Dependent Claim
24 words
The multilayer elastomer structure of claim 5 wherein the intermediate layer (30) of the laminate is a layer of at least one reinforcing fabric.
Claim 8
Dependent Claim
44 words
The multilayer elastomer structure of claim 5 wherein the inner layer (32) of cured rubber is obtained by curing a composition comprising at least one rubber, at least one filler, a metal acrylate, a peroxide crosslinking agent and sulfur-containing curing compound having available sulfur.
Claim 9
Dependent Claim
21 words
A bladder useful as a turn-up bladder for a tire assembly machine which comprises the multilayer elastomeric structure of claim 5.
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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) | 1996-11-08 | 1997-05-10 | 1997-11-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-11-08 | 2001-05-10 | 2001-11-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-11-08 | 2005-05-10 | 2005-11-09 | $7700.00 | Window Closed / Lapsed |