Patent US3900455A successfully refreshed from Google Patents.
US3900455A
Expired / Lapsed
US
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Process to emulsion polymerize vinyl chloride
Assignee: Stauffer Chemical Co
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Filing: 1974-08-16
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Granted: 1975-08-19
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Expires: 1994-08-16
Abstract
Abstract The emulsion polymerization of polyvinyl chloride can be conducted without any appreciable polymer buildup or plate-out on the internal surfaces of the polymerization reactor by utilizing a sodium alkyl sulfosuccinate as the emulsifier in the presence of small amounts, e.g., about 0.01% to 3%, by weight, of an ammonium or alkali metal borate.
Inventors
- 👤 Paul Kraft
- 👤 Jung Il Jin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:11
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
38 words
IN AN EMULSION POLYMERIZATION OF VINYL CHLORIDE MONOMER IN THE PESENCE OF AN EMULSIFIER WHEREIN THE IMPROVEMENT COMPRISES CONDUCTING SAID POLYMERIZATION IN A POLYMERIZATION MEDIUM COMPRISING A SODIUM ALKYL SULFOSUCCINATE EMULSIFIER AND IN AMMONIUM OR ALKALI METAL BORATE.
Claim 2
Dependent Claim
38 words
IN AN EMULSION POLYMERIZATION OF VINYL CHLORIDE MONOMER IN THE PESENCE OF AN EMULSIFIER WHEREIN THE IMPROVEMENT COMPRISES CONDUCTING SAID POLYMERIZATION IN A POLYMERIZATION MEDIUM COMPRISING A SODIUM ALKYL SULFOSUCCINATE EMULSIFIER AND IN AMMONIUM OR ALKALI METAL BORATE.
Claim 3
Dependent Claim
29 words
A process as claimed in claim 1 wherein the amount of sodium alkyl sulfosuccinate emulsifier ranges from about 0.5% by weight to 3% by weight of the polymerization medium.
Claim 4
Dependent Claim
27 words
A process as claimed in claim 1 wherein the amount of borate ranges between about 0.01% by weight and about 3% by weight of the polymerization medium.
Claim 5
Dependent Claim
26 words
A process as claimed in claim 1 wherein the amount of borate ranges between about 0.01% by weight and about 1% weight of the polymerization medium.
Claim 6
Dependent Claim
24 words
A process as claimed in claim 1 wherein the borate is seleCted from the group consisting of the borates of ammonium, sodium and potassium.
Claim 7
Dependent Claim
15 words
A process as claimed in claim 5 wherein the borate is a borate of sodium.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 1 wherein the borate is added to the polymerization medium.
Claim 9
Dependent Claim
44 words
A process as claimed in claim 1 wherein the borate is generated in the polymerization medium by the addition to said medium of boric acid and a compound selected from the group consisting of the hydroxides and bicarbonates of ammonium or the alkali metals.
Claim 10
Dependent Claim
17 words
A process as claimed in claim 8 wherein the compound is a hydroxide or bicarbonate of sodium.
Claim 11
Dependent Claim
18 words
A process as claimed in claim 1 wherein the sulfosuccinate emulsifier is a sodium sulfosuccinate isodecanol half ester.
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) | 1978-08-18 | 1979-02-17 | 1979-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-18 | 1983-02-17 | 1983-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-18 | 1987-02-17 | 1987-08-19 | $7700.00 | Window Closed / Lapsed |