US4553578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Star-shaped polymers for improved tire treads
Assignee: Aerojet Rocketdyne Holdings Inc
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Filing: 1985-01-30
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Granted: 1985-11-19
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Expires: 2005-01-30
Abstract
Abstract A tire having a tread exhibiting substantial low rolling resistance, traction and wear comprises a cured compounded carbon black reinforced blend of (A) a star-shaped substantially random vinyl containing rubbery solution polymerized polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same and (B) at least one other rubbery diene polymer.
Inventors
- 👤 Francis J. Vitus
- 👤 Ivan G. Hargis
- 👤 Russell A. Livigni
- 👤 Sundar L. Aggarwal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:56
CPC Classifications
C; C08; C08F; C08F236/00; C08F236/02; C08F236/04; C08F236/10; C08F297/00; C08F297/02; C08F297/04; C08F297/042; C08L; C08L21/00; C08L67/00; C08L67/06; Y; Y02; Y02T; Y02T10/00; Y02T10/80; Y02T10/86; Y10; Y10S; Y10S152/00; Y10S152/905; Y10S525/00; Y10S525/901; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31826; Y10T428/31855; Y10T428/31931
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
251 words
A tire having a tread of a compounded carbon black reinforced and vulcanized composition of a blend of (A) from about 40 to 60% by weight of a solution polymerized rubbery substantially random star-shaped polymer and (B) from 60 to 40% by weight of at least one rubbery polymer selected from the group consisting of natural rubber, synthetic cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber, high trans-1,4-polybutadiene rubber and high trans-1,4-butadiene-styrene rubbery copolymer, (A) being at least one polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same, said styrene containing copolymers containing up to about 30 weight % of styrene, preferably from about 10 to 25 weight % of styrene, having a vinyl content for the diene segments of from about 12 to 60 weight %, having an average of from about 4 to 9 arms, having a Mn of from about 100,000 to 500,000, and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having an average of from about 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms, the mold ratio of RLi to said aromatic compound being about 1:0.83.
Claim 2
Dependent Claim
251 words
A tire having a tread of a compounded carbon black reinforced and vulcanized composition of a blend of (A) from about 40 to 60% by weight of a solution polymerized rubbery substantially random star-shaped polymer and (B) from 60 to 40% by weight of at least one rubbery polymer selected from the group consisting of natural rubber, synthetic cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber, high trans-1,4-polybutadiene rubber and high trans-1,4-butadiene-styrene rubbery copolymer, (A) being at least one polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same, said styrene containing copolymers containing up to about 30 weight % of styrene, preferably from about 10 to 25 weight % of styrene, having a vinyl content for the diene segments of from about 12 to 60 weight %, having an average of from about 4 to 9 arms, having a Mn of from about 100,000 to 500,000, and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having an average of from about 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms, the mold ratio of RLi to said aromatic compound being about 1:0.83.
Claim 3
Dependent Claim
17 words
A tire according to claim 1 where (A) is a butadiene-styrene copolymer and (B) is natural rubber.
Claim 4
Dependent Claim
240 words
A vulcanizable composition comprising a blend of (A) from about 40 to 60% by weight of a solution polymerized rubbery substantially random star-shaped polymer and (B) from 60 to 40% by weight of at least one rubbery polymer selected from the group consisting of natural rubber, synthetic cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber, high trans-1,4-polybutadiene rubber and high trans-1,4-butadiene-styrene rubbery copolymer, (A) being at least one polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same, said styrene containing copolymers containing up to about 30 weight % of styrene, preferably from about 10 to 25 weight % of styrene, having a vinyl content for the diene segments of from about 12 to 60 weight %, having an average of from about 4 to 9 arms, having a Mn of from about 100,000 to 500,000, and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having an average of from about 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms, the mold ratio of RLi to said aromatic compound being about 1:0.83.
Claim 5
Dependent Claim
240 words
A vulcanizable composition comprising a blend of (A) from about 40 to 60% by weight of a solution polymerized rubbery substantially random star-shaped polymer and (B) from 60 to 40% by weight of at least one rubbery polymer selected from the group consisting of natural rubber, synthetic cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber, high trans-1,4-polybutadiene rubber and high trans-1,4-butadiene-styrene rubbery copolymer, (A) being at least one polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same, said styrene containing copolymers containing up to about 30 weight % of styrene, preferably from about 10 to 25 weight % of styrene, having a vinyl content for the diene segments of from about 12 to 60 weight %, having an average of from about 4 to 9 arms, having a Mn of from about 100,000 to 500,000, and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having an average of from about 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms, the mold ratio of RLi to said aromatic compound being about 1:0.83.
Claim 6
Dependent Claim
17 words
A composition according to claim 3 where (A) is a butadiene-styrene copolymer and (B) is natural rubber.
Claim 7
Dependent Claim
241 words
A vulcanized compounded carbon black reinforced blend of (A) from about 40 to 60% by weight of a solution polymerized rubbery substantially random star-shaped polymer and (B) from 60 to 40% by weight of at least one rubbery polymer selected from the group consisting of natural rubber, synthetic cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber, high trans-1,4-polybutadiene rubber and high trans-1,4-butadiene-styrene rubbery copolymer, (A) being at least one polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same, said styrene containing copolymers containing up to about 30 weight % of styrene, preferably from about 10 to 25 weight % of styrene, having a vinyl content for the diene segments of from about 12 to 60 weight %, having an average of from about 4 to 9 arms, having a Mn of from about 100,000 to 500,000, and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having an average of from about 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms, the mold ratio of RLi to said aromatic compound being about 1:0.83.
Claim 8
Dependent Claim
241 words
A vulcanized compounded carbon black reinforced blend of (A) from about 40 to 60% by weight of a solution polymerized rubbery substantially random star-shaped polymer and (B) from 60 to 40% by weight of at least one rubbery polymer selected from the group consisting of natural rubber, synthetic cis-1,4-polyisoprene rubber, cis-1,4-polybutadiene rubber, high trans-1,4-polybutadiene rubber and high trans-1,4-butadiene-styrene rubbery copolymer, (A) being at least one polymer selected from the group consisting of polybutadienes, polyisoprenes, butadiene-styrene copolymers, butadiene-isoprene copolymers, isoprene-styrene copolymers, butadiene-isoprene-styrene copolymers and mixtures of the same, said styrene containing copolymers containing up to about 30 weight % of styrene, preferably from about 10 to 25 weight % of styrene, having a vinyl content for the diene segments of from about 12 to 60 weight %, having an average of from about 4 to 9 arms, having a Mn of from about 100,000 to 500,000, and having a nucleus from an initiator (1) having a VPO Mn of from about 750 to 4,000, (2) having an average of from about 4 to 9 C-Li sites and (3) being the adduct of an aromatic compound selected from the group consisting of divinyl benzene and diisopropenyl benzene and mixtures thereof and RLi where R is selected from the group consisting of normal, secondary and tertiary alkyl and cycloalkyl radicals of from 2 to 20, or from 2 to 10, carbon atoms, the mold ratio of RLi to said aromatic compound being about 1:0.83.
Claim 9
Dependent Claim
17 words
A blend according to claim 5 where (A) is a butadiene-styrene copolymer and (B) is natural rubber.
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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) | 1988-11-18 | 1989-05-20 | 1989-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-11-18 | 1993-05-20 | 1993-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-11-18 | 1997-05-20 | 1997-11-19 | $7700.00 | Window Closed / Lapsed |