US4303765A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of storable 2-chloro-1,3-butadiene/sulfur copolymers
Assignee: Bayer AG
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Filing: 1980-06-06
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Granted: 1981-12-01
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Expires: 2000-06-06
Abstract
Abstract A process for the production of storable 2-chloro-1,3-butadiene/sulphur copolymers by peptization using sulphur containing petizing agents, wherein a compound corresponding to the following general formula: R1-Sn-R1 wherein n represents an integer having a value of from 2 to 10, preferably from 3 to 8 and, more particularly, from 4 to 6; and R1 represents a C6-C14 aryl radical, a C6-C14 aryl-C1-C3 alkyl radical or a heterocycle containing from 1 to 3 hereto atoms, such as N, which may be the same or different and which may optionally be substituted; optionally in combination with a nucleophilic substance, is added to the latex and peptized at from 5 DEG to 100 DEG C. and at pH of from 14 to 3.
Inventors
- 👤 Rudiger Musch
- 👤 Rudiger Schubart
- 👤 Wilhelm Gobel
- 👤 Gottfried Pampus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:23
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/14; C08F36/16; C08F36/18; C08C; C08C19/00; C08C19/08
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
120 words
A process for producing storable 2-chloro-1,3-butadiene/sulfur copolymer latex by peptization of a highly viscous 2-chloro-1,3-butadiene/sulfur copolymer latex using a sulfur containing peptizing agent wherein as the peptizing agent a compound of the formula R 1 --S n --R 1 is added to the highly viscous latex of said copolymer after polymerization and the copolymer is peptized at from 5° to 100° C. at a pH of from 14 to 3, n being an integer of from 4 to 6 and R 1 being selected from the group consisting of aryl having 6 to 14 carbon atoms and aralkyl wherein the aryl moiety has from 6 to 14 carbon atoms and the alkyl moiety has from 1 to 3 carbon atoms.
Claim 2
Dependent Claim
120 words
A process for producing storable 2-chloro-1,3-butadiene/sulfur copolymer latex by peptization of a highly viscous 2-chloro-1,3-butadiene/sulfur copolymer latex using a sulfur containing peptizing agent wherein as the peptizing agent a compound of the formula R 1 --S n --R 1 is added to the highly viscous latex of said copolymer after polymerization and the copolymer is peptized at from 5° to 100° C. at a pH of from 14 to 3, n being an integer of from 4 to 6 and R 1 being selected from the group consisting of aryl having 6 to 14 carbon atoms and aralkyl wherein the aryl moiety has from 6 to 14 carbon atoms and the alkyl moiety has from 1 to 3 carbon atoms.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1 wherein the compound of said formula is added in an amount of from 0.1 to 10 millimoles per 100 g of copolymer.
Claim 4
Dependent Claim
29 words
A process as claimed in claim 1 wherein the compound of said formula is added in an amount of from 0.2 to 5 millimoles per 100 g of copolymer.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1 wherein a nucleophilic substance is added to said copolymer latex.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-30 | 1985-06-01 | 1985-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-30 | 1989-06-01 | 1989-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-30 | 1993-06-01 | 1993-12-01 | $7700.00 | Window Closed / Lapsed |