US3862913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerisation process
Assignee: BP Chemicals Ltd
•
Filing: 1973-08-20
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Granted: 1975-01-28
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Expires: 1993-08-20
Abstract
Abstract Rubber reinforced polymers prepared by destabilizing an aqueous rubber latex in presence of a cellulose based protective colloid and monomer, and polymerising the monomer under suspension conditions.
Inventors
- 👤 Alan Charles Sturt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:26
CPC Classifications
C; C08; C08F; C08F291/00; C08F291/02
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
16 words
As a process as claimed in claim 1 wherein the protective colloid is a hydroxyethyl cellulose.
Claim 2
Dependent Claim
38 words
The process as claimed in claim 1, wherein the rubber latex is stabilised by means of a carboxylic acid salt emulsifying agent which is subsequently destroyed by the addition of a relatively strong acid to the aqueous phase.
Claim 3
Dependent Claim
30 words
The process as claimed in claim 3, wherein the emulsifying agent is an alkali metal or ammonium salt of a saturated fatty acid containing from 8 to 20 carbon atoms.
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) | 1978-01-27 | 1978-07-29 | 1979-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-01-27 | 1982-07-29 | 1983-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-01-27 | 1986-07-29 | 1987-01-28 | $7700.00 | Window Closed / Lapsed |