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Patent US3984609A successfully refreshed from Google Patents.
US3984609A
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US
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Process for the instantaneous peptization of polychloroprene latex
Assignee: Distugil SA
•
Filing: 1974-04-29
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Granted: 1976-10-05
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Expires: 1994-04-29
Abstract
Abstract A process for instantaneous peptization of polychloroprene latexes made by polymerizing in the presence of sulfur and a modifying agent such as iodoform or a dialkylxanthogen disulfide, by adding a suitable thiol at a pH at least equal to 9.
Inventors
- 👤 Paul Branlard
- 👤 Jacques Modiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 04:22
CPC Classifications
C; C08; C08F; C08F136/00; C08F136/02; C08F136/04; C08F136/14; C08F136/16; C08F136/18; C08C; C08C19/00; C08C19/085; C08F36/00; C08F36/02; C08F36/04; C08F36/14; C08F36/16
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
134 words
A process for the instantaneous peptisation of polychloroprene latexes, comprising polymerizing the chloroprene monomer in the presence of sulfur and a modifying agent selected from the group consisting of iodoform and the dialkylxanthogen disulphides, and peptizing the latexes at a pH at least equal to 9, by adding a thiol of the general formula R--SH or its ionized sulfenyl form RS -ME + , Me being an alkali cation or ammonium, in which R is: an alkyl group containing from 2 to 16 carbon atoms, the chain of which is straight or branched, or a mixture of different alkyl groups; an aryl or alkylaryl group; an arylcarbonyl group; an alkylcarboxy group; an alkylnaphthyl or naphthyl group; an arylthiazole or thiazole group or its sodium salt; an arylimidazole or imidazole group; or an alkylxanthate group.
Claim 2
Dependent Claim
134 words
A process for the instantaneous peptisation of polychloroprene latexes, comprising polymerizing the chloroprene monomer in the presence of sulfur and a modifying agent selected from the group consisting of iodoform and the dialkylxanthogen disulphides, and peptizing the latexes at a pH at least equal to 9, by adding a thiol of the general formula R--SH or its ionized sulfenyl form RS -ME + , Me being an alkali cation or ammonium, in which R is: an alkyl group containing from 2 to 16 carbon atoms, the chain of which is straight or branched, or a mixture of different alkyl groups; an aryl or alkylaryl group; an arylcarbonyl group; an alkylcarboxy group; an alkylnaphthyl or naphthyl group; an arylthiazole or thiazole group or its sodium salt; an arylimidazole or imidazole group; or an alkylxanthate group.
Claim 3
Dependent Claim
18 words
A process according to claim 1 wherein the thiol addition is conducted at the end of the polymerization.
Claim 4
Dependent Claim
14 words
A process according to claim 1 wherein the pH is from 11 to 13.
Claim 5
Dependent Claim
23 words
A process according to claim 1 wherein the ratio of thiol added is from 0.05 to 10 millimoles per mole of chloroprene monomer.
Claim 6
Dependent Claim
24 words
A process according to claim 1 wherein the ratio of sulfur added is from 0.01% to 2% by weight based on the chloroprene monomer.
Claim 7
Dependent Claim
27 words
A process according to claim 1 wherein dialkylxanthogen disulfide is the modifying agent added in a ratio of 0.5 to 4 millimoles per mole of chloroprene monomer.
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein the thiol is thiobenzoic or p-mercaptobenzoic acid.
Claim 9
Dependent Claim
15 words
A process according to claim 1 wherein the thiol is mercaptobenzothiazole or its sodium salt.
Claim 10
Dependent Claim
13 words
A process in accordance with claim 1 wherein said modifying agent is iodoform.
Claim 11
Dependent Claim
9 words
The product produced by the process of claim 4.
Claim 12
Dependent Claim
27 words
A process according to claim 9 wherein iodoform is the modifying agent added in a ratio of from 0.1 to 4 millimoles per mole of chloroprene monomer.
Claim 13
Dependent Claim
14 words
A process in accordance with claim 1 wherein said modifying agent is diisopropylxanthogen disulfide.
References Cited (Backward Citations)
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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) | 1979-10-05 | 1980-04-05 | 1980-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-05 | 1984-04-05 | 1984-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-05 | 1988-04-05 | 1988-10-05 | $7700.00 | Window Closed / Lapsed |