US4133947A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of polymers of vinyl chloride for paste preparation using spray-drying
Assignee: Vestolit GmbH
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Filing: 1976-07-07
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Granted: 1979-01-09
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Expires: 1996-07-07
Abstract
Abstract An improved process for the aqueous emulsion polymerization of vinyl chloride to be spray-dried and thus form paste-yielding polymers wherein the polymerization is conducted in an emulsion containing at least 45% by weight of monomers together with an emulsifying amount of alkali metal fatty acid salts of 8-18 carbon atoms at a pH of 9.5-11.5, and wherein the pH is reduced to a value between 6 and 7.5 prior to spray-drying or to a value between 4 and 7.5 during the spray-drying step.
Inventors
- 👤 Josef Kalka
- 👤 Hermann Winter
- 👤 Alfred Kania
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:23
CPC Classifications
C; C08; C08F; C08F14/00; C08F14/02; C08F14/04; C08F14/06
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
239 words
A process for the production of powdery polymers of vinyl chloride having improved plastisol properties and containing no more than 2% by weight of particles having a diameter greater than 40 microns, which comprises spray drying the polymer dispersion obtained by the aqueous emulsion polymerization of an emulsion containing at least 45% by weight of monomers, in the presence of a sodium or potassium salt of a fatty acid of 8-18 carbon atoms as the emulsifier and a water-soluble free radical generating catalyst to a conversion of at least 80%, the polymerization being conducted either (a) discontinuously in a reactor having a capacity of at least 6 m 3 and in the presence of no more than 1% by weight of emulsifier, based on the polyvinyl chloride, with at least the portion of the polymerization above a conversion of 30% being conducted in a pH range of 9.5-11.5; or (b) continuously in the presence of no more than 2% by weight of emulsifier, based on the polyvinyl chloride, in a pH range throughout the polymerization of 9.5-11.5; and which comprises the step of adjusting the pH of the resultant polymer dispersion to a pH of 6-7.5 before the spray-drying step or to a pH of 4-7.5 during the spray-drying step to produce said powdery polymers of vinyl chloride having improved plastisol properties and containing no more than 2% by weight of particles having a diameter greater than 40 microns.
Claim 2
Dependent Claim
239 words
A process for the production of powdery polymers of vinyl chloride having improved plastisol properties and containing no more than 2% by weight of particles having a diameter greater than 40 microns, which comprises spray drying the polymer dispersion obtained by the aqueous emulsion polymerization of an emulsion containing at least 45% by weight of monomers, in the presence of a sodium or potassium salt of a fatty acid of 8-18 carbon atoms as the emulsifier and a water-soluble free radical generating catalyst to a conversion of at least 80%, the polymerization being conducted either (a) discontinuously in a reactor having a capacity of at least 6 m 3 and in the presence of no more than 1% by weight of emulsifier, based on the polyvinyl chloride, with at least the portion of the polymerization above a conversion of 30% being conducted in a pH range of 9.5-11.5; or (b) continuously in the presence of no more than 2% by weight of emulsifier, based on the polyvinyl chloride, in a pH range throughout the polymerization of 9.5-11.5; and which comprises the step of adjusting the pH of the resultant polymer dispersion to a pH of 6-7.5 before the spray-drying step or to a pH of 4-7.5 during the spray-drying step to produce said powdery polymers of vinyl chloride having improved plastisol properties and containing no more than 2% by weight of particles having a diameter greater than 40 microns.
Claim 3
Dependent Claim
28 words
A process according to claim 1, wherein the discontinuous method (a) is employed and the entire polymerization is conducted in a pH range of 9.5-11.5 to 85-95% conversion.
Claim 4
Dependent Claim
52 words
A process according to claim 1, wherein the discontinuous method (a) is employed and the polymerization is conducted up to a conversion of 85-95%, the conversion up to 15% being conducted in a pH range of 6-6.5 and the conversion from 15 to 30% being conducted in a pH range of 6.5-7.5.
Claim 5
Dependent Claim
22 words
A process according to claim 1, wherein the pH adjustment step is effected on a latex having a temperature of 30°-60° C.
Claim 6
Dependent Claim
16 words
A process according to claim 1, wherein the emulsifier employed is sodium laurate or sodium myristate.
Claim 7
Dependent Claim
18 words
A process according to claim 1 wherein the continuous method (b) is employed to a conversion of 85-93%.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the pH adjustment step is conducted during the spray-drying step.
Claim 9
Dependent Claim
17 words
A process according to claim 1 wherein the pH adjustment step is conducted before the spray-drying step.
References Cited (Backward Citations)
GB724558A
Cited
US2829134A
Cited
US2721859A
Cited
GB784283A
Cited
GB834810A
Cited
US3840507A
Cited
US3883494A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-01-08 | 1982-07-10 | 1983-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-08 | 1986-07-10 | 1987-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-08 | 1990-07-10 | 1991-01-09 | $7700.00 | Window Closed / Lapsed |