US3969334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing granular chloroprene polymer rubber
Assignee: Tosoh Corp
•
Filing: 1975-10-15
•
Granted: 1976-07-13
•
Expires: 1995-10-15
Abstract
Abstract This invention relates to a novel process of preparing chloroprene polymer rubber granules. The process comprises adding 4 to 10 wt. parts of sodium silicate to 100 wt. parts of a cationic latex of chloroprene polymer and then adding an alkaline earth metal salt or an acid to precipitate granules of the chloroprene polymer rubber.
Inventors
- 👤 Akihiko Shimizu
- 👤 Yasuhiro Sakanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:11
CPC Classifications
C; C08; C08C; C08C1/00; C08C1/14; Y; Y10; Y10S; Y10S528/00; Y10S528/931; Y10S528/934; Y10S528/936
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
50 words
A process for preparing granular chloroprene polymer rubber which comprises adding 4 - 10 wt. parts of sodium silicate to 100 wt. parts of a cationic latex of chloroprene polymer or copolymer, then adding an alkaline earth metal salt or an acid to precipitate granules of the chloroprene polymer rubber.
Claim 2
Dependent Claim
50 words
A process for preparing granular chloroprene polymer rubber which comprises adding 4 - 10 wt. parts of sodium silicate to 100 wt. parts of a cationic latex of chloroprene polymer or copolymer, then adding an alkaline earth metal salt or an acid to precipitate granules of the chloroprene polymer rubber.
Claim 3
Dependent Claim
21 words
The process of claim 1, wherein the alkaline earth metal salt is added at 0.5 - 1 equivalent to sodium silicate.
Claim 4
Dependent Claim
17 words
The process of claim 1, wherein the acid is added to provide pH of 2 - 7.
Claim 5
Dependent Claim
21 words
The process of claim 1, wherein the surface of the granular rubber is covered with a silicate or a polysilicic acid.
Claim 6
Dependent Claim
26 words
The process of claim 1, wherein sodium silicate is a compound having the formula of Na 2 O--nSiO 2 , wherein n = 2 - 4.
References Cited (Backward Citations)
US2702798A
Cited
US2948701A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |