US3676386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket-forming solvent-based compositions containing styrene-butadiene block copolymers
Assignee: WR Grace and Co
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Filing: 1970-01-05
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Granted: 1972-07-11
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Expires: 1990-01-05
Abstract
Abstract Gasket-forming compositions based on styrene-butadiene block copolymers blended with a minor portion of random styrenebutadiene copolymer and polyisobutylene are prepared by conventional rubber compounding techniques in the presence of low molecular weight polyethyethylene. Fillers and solvents are used to complete the formula.
Inventors
- 👤 Mannie Brenner
- 👤 Fred L Chase
- 👤 Arthur J Leydon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:44
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J3/091; C08L; C08L53/00; C08L53/02; C08J2353/00; C08J2353/02
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
52 words
The composition of claim 1 wherein the average molecular weight of the block copolymer is within the range of about 60,000 to 160,000 and the styrene content within the range of about 25 to 30 percent by weight, said styrene being distributed about equally in the two Z segments of the molecules.
Claim 2
Dependent Claim
20 words
The composition of claim 1 wherein the polyisobutylene has a molecular weight within the range of about 60,000 to 85,000.
Claim 3
Dependent Claim
23 words
The composition of claim 1 wherein about one part of a solid water-soluble polyethylene glycol is added per 10 parts of the polyethylene.
Claim 4
Dependent Claim
34 words
The composition of claim 1 wherein a calcined clay having a specific gravity of about 1.8 to 2.3 is employed at the rate of about 35 to 55 parts per hundred parts of rubber.
Claim 5
Dependent Claim
26 words
The composition of claim 1 wherein from about 30 to 200 parts of a solid rosin ester is used for each 100 parts of rubber mixture.
Claim 6
Dependent Claim
16 words
The composition of claim 1 containing about 40 to 60 percent organic liquid solvent by weight.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |