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US3920623A
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Treatment of chloroprene-sulfur copolymers with benzothiazole sulfenamides
Assignee: EIDP Inc
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Filing: 1973-05-25
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Granted: 1975-11-18
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Expires: 1993-05-25
Abstract
Abstract Polymerizing chloroprene in an alkaline-aqueous emulsion in the presence of elemental sulfur to form a chloroprene polymer latex and incorporating into the system at a time no later than when the polymer is in the latex state, e.g., during polymerization, at least about 0.5 part by weight per hundred parts organic monomer of a sulfenamide compound having the structure WHERE R and R'' are alkyl, cycloalkyl, aralkyl radicals or one of R or R'' can be hydrogen, or R and R'' together can form a saturated ring with the nitrogen, e.g., 2(morpholinothio)benzothiazole and after polymerization and subsequent to the addition of the sulfenamide, or at the same time the sulfenamide is added, separately adding certain peptizing agents.
Inventors
- 👤 Ausat Ali Khan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:50
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04; C08F36/14; C08F36/16
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
75 words
IN A PROCESS FOR MAKING CHLOROPRENE-SULFUR COPOLYMER WHICH COMPRISES POLYMERIZING CHLOROPRENE IN AN ALKALINE AQUEOUS EMULSION IN THE PRESENCE OF ELEMENTAL SULFUR AND A FREE RADICAL POLYMERIZATION CATALYST TO FORM A CHLOROPRENE POLYMER LATEX, THE IMPROVEMENT WHICH COMPRISES INCORPORATING INTO THE SYSTEM AT A TIME NO LATER THAN WHEN THE POLYMER IS IN THE LATEX STATE AT LEAST ABOUT 0.5 PART BY WEIGHT PER HUNDRED PARTS ORGANIC MONOMER OF A SULFENAMIDE COMPOUND HAVING THE STRUCTURE
Claim 2
Dependent Claim
75 words
IN A PROCESS FOR MAKING CHLOROPRENE-SULFUR COPOLYMER WHICH COMPRISES POLYMERIZING CHLOROPRENE IN AN ALKALINE AQUEOUS EMULSION IN THE PRESENCE OF ELEMENTAL SULFUR AND A FREE RADICAL POLYMERIZATION CATALYST TO FORM A CHLOROPRENE POLYMER LATEX, THE IMPROVEMENT WHICH COMPRISES INCORPORATING INTO THE SYSTEM AT A TIME NO LATER THAN WHEN THE POLYMER IS IN THE LATEX STATE AT LEAST ABOUT 0.5 PART BY WEIGHT PER HUNDRED PARTS ORGANIC MONOMER OF A SULFENAMIDE COMPOUND HAVING THE STRUCTURE
Claim 3
Dependent Claim
27 words
A process of claim 1 wherein R and R'' are alkyl radicals having 1 to 12 carbon atoms and one of R or R'' can be hydrogen.
Claim 4
Dependent Claim
25 words
The process of claim 1 wherein R and R'' are cycloalkyl radicals having 5-7 carbon atoms and one of R or R'' can be hydrogen.
Claim 5
Dependent Claim
10 words
A process of claim 1 wherein the sulfenamide is 2-(morpholinothio)benzothiazole.
Claim 6
Dependent Claim
10 words
A process of claim 1 wherein the sulfenamide is 2-(cyclohexylaminothio)benzothiazole.
Claim 7
Dependent Claim
10 words
A process of claim 1 wherein the sulfenamide is 2-(tert-butylaminothio)benzothiazole.
Claim 8
Dependent Claim
10 words
A process of claim 1 wherein the sulfenamide is 2-(2,6-dimethylmorpholinothio)benzothiazole.
Claim 9
Dependent Claim
20 words
A process of claim 1 wherein sulfenamide is added after polymerization while the polymer is still in the latex state.
Claim 10
Dependent Claim
14 words
A process of claim 1 wherein the peptizing agent is added to the latex.
Claim 11
Dependent Claim
23 words
A process of claim 1 wherein the amount of sulfenamide added is about from 0.5-10 parts by weight per hundred parts of monomer.
Claim 12
Dependent Claim
19 words
A process of claim 1 wherein the amount of elemental sulfur is about from 0.025-2.5% of organic monomer used.
Claim 13
Dependent Claim
16 words
A process of claim 1 wherein the peptizing agent is a water-soluble salt of dialkyldithiocarbamic acid.
Claim 14
Dependent Claim
15 words
A process of claim 12 wherein each alkyl group contains 1 to 4 carbon atoms.
Claim 15
Dependent Claim
16 words
A process of claim 12 wherein the peptizing agent is a Water-soluble salt of dibutyldithiocarbamic acid.
Claim 16
Dependent Claim
10 words
A process of claim 12 wherein the sulfenamide is 2-(morpholinothio)benzothiazole.
Claim 17
Dependent Claim
18 words
A process of claim 15 wherein a free radical scavenger is added to the latex to terminate polymerization.
References Cited (Backward Citations)
US2476688A
Cited
US3378538A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |