US4298714A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modified polyvinylchloride
Assignee: Yeda Research and Development Co Ltd
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Filing: 1980-12-16
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Granted: 1981-11-03
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Expires: 2000-12-16
Abstract
Abstract The present invention relates to modified polyvinylchloride, wherein part of the chlorine atoms are replaced by groups of the formula -S-CH2-CH2-R-(CH2-CH2-R)n-Alk, wherein R is selected from oxygen, sulfur and -NH-, where R may also designate a bond, where Alk designates an alkyl group of up to 14 carbon atoms, and where n is zero or an integer of from 1 to 100, and to a process for the production of such modified polyvinylchloride polymers which comprises reacting an aqueous emulsion or suspension of polyvinylchloride in the presence of a solvent adapted to cause swelling of the PVC particles with a compound of the formula Alk-(CH2-CH2-R)n-R-CH2-CH2-SH, wherein Alk, R and n are as defined above.
Inventors
- 👤 Gideon Levin
- 👤 David Vofsi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 00:24
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/34
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
61 words
A modified polyvinyl chloride wherein part of the chlorine atoms are substituted by groups of the formula --S--CH.sub.2 --CH.sub.2 --R--(CH.sub.2 --CH.sub.2 --R).sub.n --Alk wherein R, which may be identical or different, designates oxygen, sulfur, --NH-- or a bond, wherein Alk designates alkyl of up to 14 carbon atoms, and wherein n is an integer of from 1 to 100 or zero.
Claim 2
Dependent Claim
61 words
A modified polyvinyl chloride wherein part of the chlorine atoms are substituted by groups of the formula --S--CH.sub.2 --CH.sub.2 --R--(CH.sub.2 --CH.sub.2 --R).sub.n --Alk wherein R, which may be identical or different, designates oxygen, sulfur, --NH-- or a bond, wherein Alk designates alkyl of up to 14 carbon atoms, and wherein n is an integer of from 1 to 100 or zero.
Claim 3
Dependent Claim
11 words
A modified polymer according to claim 1, wherein R is oxygen.
Claim 4
Dependent Claim
20 words
A modified polymer according to claim 1, wherein the substituent groups are of the formula CH.sub.3 --(CH.sub.2).sub.3 --O--(CH.sub.2).sub.2 --O--(CH.sub.2).sub.2 --S--
Claim 5
Dependent Claim
66 words
A process for the production of modified polyvinyl chlorides defined in claim 1, which comprises reacting an aqueous suspension or emulsion of polyvinyl chloride, in the presence of a small quantity of a solvent adapted to cause swelling of the P.V.C. particles, with a compound of the formula Alk--R--(CH.sub.2).sub.2 --(CH.sub.2 --CH.sub.2 --R).sub.n --R--CH.sub.2 --CH.sub.2 --SH wherein Alk, R and n are as defined in claim 1.
Claim 6
Dependent Claim
16 words
A process according to claim 4, wherein the solvent is selected from cyclohexanone, THF, methyl-ethyl ketone.
Claim 7
Dependent Claim
19 words
A process according to claim 4, wherein the reaction is effected at a temperature between 0° and 100° C.
Claim 8
Dependent Claim
17 words
A process according to claim 4, wherein the reactant used for the modification is a polyether thiolate.
Claim 9
Dependent Claim
21 words
A process according to claim 4, wherein the reactant used for the modification is selected from 2-(2'-butoxyethoxy)-ethyl thiolate and an alkyl-mercaptan.
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) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |