US3945977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard rubber compositions with high extender oil levels
Assignee: Phillips Petroleum Co
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Filing: 1974-03-20
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Granted: 1976-03-23
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Expires: 1994-03-20
Abstract
Abstract A vulcanizable composition is provided which comprises a butadiene-styrene A-B block copolymer having from 30 to 50 weight percent block polystyrene, 40 to 100 php of an extender oil and 20 to 100 php of carbon black.
Inventors
- 👤 Kenneth E. Snavely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 10:21
CPC Classifications
C; C08; C08K; C08K3/00; C08K3/02; C08K3/04; C08L; C08L53/00; C08L53/02; C08L91/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
A vulcanizable composition characterized by a high extender oil level comprising: a. a butadiene-styrene block copolymer having the configuration A-B wherein A is an essentially homopolymer block of styrene and B is selected from the group consisting of an essentially homopolymer block of butadiene and a random copolymer block of butadiene and styrene, wherein said block copolymer contains from 30 to 75 weight percent styrene, said block A comprises 30 to 50 weight percent of said block copolymer and the molecular weight of said block copolymer is in the approximate range of 50,000 to 700,000; b. from 40 to 100 parts by weight of an extender oil selected from the group consisting of aromatic oils, aliphatic oils, naphthenic oils and mixtures thereof, per 100 parts by weight of said block copolymer; and c. from 20 to 100 parts by weight of carbon black per 100 parts by weight of said block copolymer.
Claim 2
Dependent Claim
152 words
A vulcanizable composition characterized by a high extender oil level comprising: a. a butadiene-styrene block copolymer having the configuration A-B wherein A is an essentially homopolymer block of styrene and B is selected from the group consisting of an essentially homopolymer block of butadiene and a random copolymer block of butadiene and styrene, wherein said block copolymer contains from 30 to 75 weight percent styrene, said block A comprises 30 to 50 weight percent of said block copolymer and the molecular weight of said block copolymer is in the approximate range of 50,000 to 700,000; b. from 40 to 100 parts by weight of an extender oil selected from the group consisting of aromatic oils, aliphatic oils, naphthenic oils and mixtures thereof, per 100 parts by weight of said block copolymer; and c. from 20 to 100 parts by weight of carbon black per 100 parts by weight of said block copolymer.
Claim 3
Dependent Claim
35 words
The composition of claim 1 wherein said extender oil is present in an amount ranging from 50 to 90 php and said carbon black is present in an amount ranging from 40 to 75 php.
Claim 4
Dependent Claim
27 words
The composition of claim 2 wherein said block copolymer contains 52 weight percent 1,3-butadiene, 48 weight percent styrene and has a polystyrene block content of 34 percent.
Claim 5
Dependent Claim
27 words
The composition of claim 2 wherein said block copolymer contains 52 weight percent 1,3-butadiene, 48 weight percent styrene and has a polystyrene block content of 33 percent.
Claim 6
Dependent Claim
6 words
The vulcanized composition of claim 1.
Claim 7
Dependent Claim
34 words
The vulcanizate of claim 5 wherein the Shore A hardness is greater than 60 and the decrease in hardness is not greater than 0.3 Shore A hardness units for each additional part of oil.
Claim 8
Dependent Claim
27 words
The vulcanizate of claim 6 wherein said block copolymer contains 52 weight percent 1,3-butadiene, 48 weight percent styrene and has a polystyrene block content of 34 percent.
Claim 9
Dependent Claim
27 words
The vulcanizate of claim 6 wherein said block copolymer contains 52 weight percent 1,3-butadiene, 48 weight percent styrene and has a polystyrene block content of 33 percent.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-03-23 | 1979-09-22 | 1980-03-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-23 | 1983-09-22 | 1984-03-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-23 | 1987-09-22 | 1988-03-23 | $7700.00 | Window Closed / Lapsed |