Patent US3950318A successfully refreshed from Google Patents.
US3950318A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polymers
Assignee: BP Chemicals Ltd
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Filing: 1975-03-21
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Granted: 1976-04-13
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Expires: 1995-03-21
Abstract
Abstract A vinyl halide paste polymer of low viscosity may be produced by adding an alkaryl sulphonate emulsifier to the polymer latex after polymerisation but before isolation. This gives a polymer which can be made into a paste in known fashion.This is a continuation, of application Ser. No. 384,716, filed Aug. 1,1973.
Inventors
- 👤 Anthony John Park
- 👤 Alan Charles Sturt
- 👤 Richard Harvey Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:48
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; C08J3/122; C08K; C08K5/00; C08K5/36; C08K5/41; C08K5/42; C08J2327/00; C08J2327/02; C08J2327/04; C08J2327/06; Y; Y10; Y10S; Y10S526/00; Y10S526/911
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
69 words
A process for the production of a vinyl halide paste forming polymer which comprises preparing a vinyl halide polymer latex by microsuspension of a vinyl halide monomer using an alkali-metal salt of an alkyl sulfuric acid as the major emulsifier, adding an aralkyl sulphonate emulsifier to said latex after polymerisation to form said latex is substantially complete, and isolating said polymer in the presence of said aralkyl sulphonate emulsifier.
Claim 2
Dependent Claim
69 words
A process for the production of a vinyl halide paste forming polymer which comprises preparing a vinyl halide polymer latex by microsuspension of a vinyl halide monomer using an alkali-metal salt of an alkyl sulfuric acid as the major emulsifier, adding an aralkyl sulphonate emulsifier to said latex after polymerisation to form said latex is substantially complete, and isolating said polymer in the presence of said aralkyl sulphonate emulsifier.
Claim 3
Dependent Claim
26 words
A process according to claim 1 where the emulsifier is an alkyl benzene sulphonate emulsifier containing from 6 to 20 carbon atoms in the alkyl group.
Claim 4
Dependent Claim
21 words
A process according to claim 1 where the amount of emulsifier used lies in the range 0.4 to 1.0% by weight.
Claim 5
Dependent Claim
32 words
A process according to claim 1 where the latex is of a homopolymer of vinyl chloride or a copolymer of vinyl chloride with less than 20% by weight of other copolymerisable materials.
Claim 6
Dependent Claim
15 words
A process according to claim 1 where the latex has been prepared by micro-suspension polymerisation.
Claim 7
Dependent Claim
14 words
A process according to claim 1 where the latex is isolated by spray drying.
Claim 8
Dependent Claim
14 words
A process according to claim 8 where the polymer is ground after spray drying.
Claim 9
Dependent Claim
19 words
A process according to claim 1, wherein the aralkyl sulphonate is an octyl, nonyl, decyl or dodecyl benzene sulphonate.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein the aralkyl sulphonate emulsifier is sodium dodecyl benzene sulphonate.
Claim 11
Dependent Claim
15 words
A process according to claim 1, wherein said major emulsifier is sodium lauryl sulphate. --
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) | 1979-04-13 | 1979-10-13 | 1980-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-13 | 1983-10-13 | 1984-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-13 | 1987-10-13 | 1988-04-13 | $7700.00 | Window Closed / Lapsed |