US4433094A
Expired / Lapsed
US
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Pneumatic tires comprising an improved thread
Assignee: Bridgestone Corp
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Filing: 1982-08-17
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Granted: 1984-02-21
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Expires: 2002-08-17
Abstract
Abstract A pneumatic tire comprising an improved tread is disclosed. The tread is composed of a rubber composition comprising 10-120 parts by weight of carbon black having an iodine adsorption number of not less than 36 mg/g and a dibutyl phthalate adsorption number of not less than 60 ml/100 g and 0.4-5 parts by weight of a vulcanizing agent based on 100 parts by weight of rubber content consisting of 40-100 parts by weight of styrene-butadiene copolymer rubber (hereinafter referred to as SBR-A) and 0-60 parts by weight of at least one diene rubber other than SBR-A; said SBR-A having a content of bound styrene (S) of 10-30 wt % and a content of 1,2-bond in butadiene portion (V) of 40-70 wt %, which are within a range of 65≦1.7S+V≦100, and satisfying that an amount of styrene sequence consisting of not less than 11 styrene monomer units is not more than 10 wt % of the content of bound styrene and an amount of styrene sequence consisting of not more than 5 styrene monomer units is not less than 80 wt % of the content of bound styrene.
Inventors
- 👤 Masaki Ogawa
- 👤 Mikihiko Ikegami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:59
CPC Classifications
B; B60; B60C; B60C1/00; B60C1/0016; C; C08; C08L; C08L9/00; C08L9/06; C08K; C08K3/00; C08K3/02; C08K3/04; C08K5/00; C08K5/01; C08L7/00; Y; Y10; Y10S; Y10S152/00; Y10S152/905; Y10T; Y10T152/00; Y10T152/10; Y10T152/10495
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
200 words
In a pneumatic tire comprising a tread, the improvement wherein said tread is composed of a rubber composition comprising 10 to 120 parts by weight of carbon black having an iodine adsorption number of not less than 36 mg/g and a dibutyl phthalate adsorption number of not less than 60 ml/100 g and 0.4 to 5 parts by weight of a vulcanizing agent based on 100 parts by weight of rubber content consisting of 40 to 100 parts by weight of styrene-butadiene copolymer rubber (hereinafter referred to as SBR-A) and 0 to 60 parts by weight of at least one diene rubber other than SBR-A; said SBR-A having a content of bound styrene (S) of 10 to 30% by weight and a content of 1,2-bond in butadiene portion (V) of 40 to 70% by weight, which are within a range of 65≦1.7S+V≦100, and satisfying that an amount of styrene sequence consisting of not less than 11 styrene monomer units is not more than 10% by weight of the content of bound styrene and an amount of styrene sequence consisting of not more than 5 styrene monomer units is not less than 80% by weight of the content of bound styrene.
Claim 2
Dependent Claim
200 words
In a pneumatic tire comprising a tread, the improvement wherein said tread is composed of a rubber composition comprising 10 to 120 parts by weight of carbon black having an iodine adsorption number of not less than 36 mg/g and a dibutyl phthalate adsorption number of not less than 60 ml/100 g and 0.4 to 5 parts by weight of a vulcanizing agent based on 100 parts by weight of rubber content consisting of 40 to 100 parts by weight of styrene-butadiene copolymer rubber (hereinafter referred to as SBR-A) and 0 to 60 parts by weight of at least one diene rubber other than SBR-A; said SBR-A having a content of bound styrene (S) of 10 to 30% by weight and a content of 1,2-bond in butadiene portion (V) of 40 to 70% by weight, which are within a range of 65≦1.7S+V≦100, and satisfying that an amount of styrene sequence consisting of not less than 11 styrene monomer units is not more than 10% by weight of the content of bound styrene and an amount of styrene sequence consisting of not more than 5 styrene monomer units is not less than 80% by weight of the content of bound styrene.
Claim 3
Dependent Claim
43 words
A pneumatic tire according to claim 1, wherein said diene rubber is selected from natural rubber, polybutadiene rubber, synthetic polyisoprene rubber, butadieneacrylonitrile copolymer rubber, butyl rubber, halogenated butyl rubber, ethylene-propylene-diene terpolymer rubber, nitrile-butadiene copolymer rubber and styrene-butadiene copolymer rubber other than said SBR-A.
Claim 4
Dependent Claim
78 words
A pneumatic tire according to claim 1, wherein said rubber content consists of 40 to 90 parts by weight of SBR-A, 10 to 40 parts by weight of styrene-butadiene copolymer rubber having a content of bound styrene of 10 to 30% by weight and a content of 1,2-bond in butadiene portion of less than 35% by weight (hereinafter referred to as SBR-B) and 0 to 50 parts by weight of diene rubber other than said styrene-butadiene copolymer rubber.
Claim 5
Dependent Claim
42 words
A pneumatic tire according to claim 1, wherein said rubber content consists of 40 to 90 parts by weight of SBR-A, 10 to 50 parts by weight of polyisoprene rubber and/or natural rubber and 0 to 40 parts by weight of polybutadiene.
Claim 6
Dependent Claim
44 words
A pneumatic tire according to claim 1, wherein in said SBR-A an amount of styrene sequence consisting of single styrene monomer unit (structure of connecting butadienes to both sides of styrene) is not less than 30% by weight of the content of bound styrene.
Claim 7
Dependent Claim
25 words
A pneumatic tire according to claim 1, wherein said SBR-A a content of trans-1,4 bond in butadiene portion is not less than 20% by weight.
Claim 8
Dependent Claim
40 words
A pneumatic tire according to claim 1, wherein in said SBR-A a value obtained by subtracting said content of cis-1,4 bond in butadiene portion from said content of trans-1,4 bond in butadiene portion is not less than 5% by weight.
Claim 9
Dependent Claim
26 words
A pneumatic tire according to claim 1, wherein said SBR-A has a ratio of weight-average molecular weight to number-average molecular weight of not more than 2.5.
Claim 10
Dependent Claim
16 words
A pneumatic tire according to claim 1, wherein said SBR-A is coupled with a stannic ion.
Claim 11
Dependent Claim
28 words
A pneumatic tire according to claim 1, wherein said vulcanizing agent is at least one substance selected from sulfur, p-quinonedioxime, p,p'-dibenzoylquinonedioxime, 4,4'-dithiodimorpholine, poly-p-dinitrosobenzene, ammonium benzoate and alkylphenol disulfide.
Claim 12
Dependent Claim
22 words
A pneumatic tire according to claim 3, wherein said SBR-B has a weight-average molecular weight of not less than 4.0×10 5 .
Claim 13
Dependent Claim
36 words
A pneumatic tire according to claim 4, wherein said polyisoprene rubber has a content of cis-1,4 bond of not less then 90% by weight and a weight-average molecular weight of not less than 1.0×10 6 .
Claim 14
Dependent Claim
16 words
A pneumatic tire according to claim 9, wherein stannic chloride is used as said stannic ion.
Claim 15
Dependent Claim
24 words
A pneumatic tire according to claim 9, wherein said SBR-A after the coupling has a Mooney viscosity (at 100° C.) of 45 to 90.
Claim 16
Dependent Claim
24 words
A pneumatic tire according to claim 9, wherein a ratio of stannic ion coupled portion in said SBR-A is 30 to 75% by weight.
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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) | 1987-02-20 | 1987-08-22 | 1988-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-20 | 1991-08-22 | 1992-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-20 | 1995-08-22 | 1996-02-21 | $7700.00 | Window Closed / Lapsed |