US3695477A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastisols and gaskets
Assignee: WR Grace and Co
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Filing: 1970-05-18
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Granted: 1972-10-03
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Expires: 1990-05-18
Abstract
Abstract Plastisols, preferably of polyvinyl chloride, having a high yield value and low high shear viscosities are obtained by thickening conventional plastisol preparations with about 1 to 40 parts of certain block copolymers of the A-B-A type in which B is an elastomeric polymer core and A stands for a thermoplastic polymerized alkenyl aromatic compound. Tough, resilient gaskets can be manufactured from these improved materials.
Inventors
- 👤 Robert P Edmonston
- 👤 John W Lefforge
- 👤 George C Keller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:09
CPC Classifications
C; C09; C09K; C09K3/00; C09K3/10; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L57/00; C08L53/00; C08L53/02; C09K2200/00; C09K2200/06; C09K2200/0615; C09K2200/0635; C09K2200/0642
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
53 words
The container closure of claim 1 wherein the plastisol contains about 5 to 25 parts by weight of a copolymer of styrene and butadiene having average over-all molecular weight of about 60,000 to 160,000 and a copolymerized styrene content within the range of 25 to 30 percent of the weight of the molecule.
Claim 2
Dependent Claim
22 words
The container closure of claim 1 wherein in the block copolymer the diene unit of the elastomeric segment is derived from isoprene.
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) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |