US5036138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Elastomeric compositions, process for the preparation thereof and tires containing them
Assignee: Kraton Polymers US LLC
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Filing: 1988-10-11
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Granted: 1991-07-30
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Expires: 2008-10-11
Abstract
Abstract The present invention relates to an elastomeric composition suitable for tire treads comprising (1) 10-90% wt of a copolymer of a mono-aromatic vinyl compound and having a vinyl content of <50% wt and a Tg<-35 degree C., and (2) 90-10% wt of a hompolymer of a conjugated diene or a copolymer of a mono-aromatic vinyl compound and a conjugated diene, containing <25% wt of mono-aromatic vinyl compound and having a vinyl content <25% wt and a Tg<-55 degree C., both polymer having a differential content of mono-aromatic vinyl compound which is <5 percentage points.
Inventors
- 👤 Jan E. Stamhuis
- 👤 Antonius A. Broekhuis
- 👤 Pieter Luijk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:09
CPC Classifications
C; C08; C08L; C08L9/00; B; B60; B60C; B60C1/00; B60C1/0016; C08L9/06; C08L2205/00; C08L2205/02; Y; Y10; Y10S; Y10S152/00; Y10S152/905; Y10S525/00; Y10S525/941
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
206 words
An elastomeric composition suitable for use in the tread portion of pneumatic tire, said composition comprising: (1) from 10 to 90% by weight of a copolymer A of a mono-aromatic vinyl compound and a conjugated diene and having a content of mono-aromatic vinyl compound in the range of from 10 to 40% by weight, a vinyl content in the conjugated diene units of at least 50% by weight, calculated on total conjugated diene units, and a glass transition temperature above minus 35° C., and (2) from 90 to 10% by weight of a polymer B which is a homopolymer of a conjugated diene or a copolymer of a mono-aromatic vinyl compound and a conjugated diene, said polymer B containing less than 25% by weight of mono-aromatic vinyl compound and having a vinyl content in the conjugated diene units of less than 25% and a glass transition temperature below minus 55° C., said percentages by weight of copolymer A and polymer B being calculated on the total of A and B, and copolymer A and polymer B, if present as a copolymer, having a differential content of the aromatic vinyl compound over the polymer chain which varies less than five percentage points; as determined by monomer conversion.
Claim 2
Dependent Claim
206 words
An elastomeric composition suitable for use in the tread portion of pneumatic tire, said composition comprising: (1) from 10 to 90% by weight of a copolymer A of a mono-aromatic vinyl compound and a conjugated diene and having a content of mono-aromatic vinyl compound in the range of from 10 to 40% by weight, a vinyl content in the conjugated diene units of at least 50% by weight, calculated on total conjugated diene units, and a glass transition temperature above minus 35° C., and (2) from 90 to 10% by weight of a polymer B which is a homopolymer of a conjugated diene or a copolymer of a mono-aromatic vinyl compound and a conjugated diene, said polymer B containing less than 25% by weight of mono-aromatic vinyl compound and having a vinyl content in the conjugated diene units of less than 25% and a glass transition temperature below minus 55° C., said percentages by weight of copolymer A and polymer B being calculated on the total of A and B, and copolymer A and polymer B, if present as a copolymer, having a differential content of the aromatic vinyl compound over the polymer chain which varies less than five percentage points; as determined by monomer conversion.
Claim 3
Dependent Claim
28 words
The elastomeric composition as claimed in claim 1 in which the differential content of the mono-aromatic vinyl compound over the polymer chain is less than two percentage points.
Claim 4
Dependent Claim
34 words
An elastomeric composition as claimed in claim 1 or 2 which contains in the range of from 20 to 50% by weight of copolymer A and 80 to 50% by weight of polymer B.
Claim 5
Dependent Claim
22 words
An elastomeric composition as claimed in claim 1 in which the mono-aromatic vinyl compound is styrene and the conjugated diene is 1,3-butadiene.
Claim 6
Dependent Claim
37 words
An elastomeric composition as claimed in claim 1 in which at least a portion of copolymer A and of polymer B, if present as a copolymer, is a coupled copolymer, coupled by means of a coupling agent.
Claim 7
Dependent Claim
39 words
An elastomeric composition as claimed in claim 1 in which the glass transition temperature of copolymer A is in the range of from minus 25° C. to plus 25° C. and that of polymer B below minus 65° C.
Claim 8
Dependent Claim
20 words
An unvulcanized elastomeric composition comprising a blend of an elastomeric composition as claimed in claim 1 with vulcanization compounding ingredients.
Claim 9
Dependent Claim
17 words
A tire whose tread has been formed by vulcanizing an elastomeric composition as claimed in claim 7.
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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) | 1994-07-29 | 1995-01-28 | 1995-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-07-29 | 1999-01-28 | 1999-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-07-29 | 2003-01-28 | 2003-07-30 | $7700.00 | Window Closed / Lapsed |