US4408015A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of polyvinyl chloride and acrylate copolymer modifier useful for high-speed calendar manufacture of sheet stock
Assignee: Huels AG
•
Filing: 1982-02-18
•
Granted: 1983-10-04
•
Expires: 2002-02-18
Abstract
Abstract Modified polyvinyl chloride is produced by suspension polymerization in the presence of monomersoluble catalysts and conventional protective colloids. After polymerization, there is added to the polymerized mixture, 0.1 to 3% by weight, based on the amount of polyvinyl chloride of the latex of a copolymer of 75-95% by weight of methyl methacrylate, 0-20% by weight of styrene, and 5-25% by weight of an acrylic acid ester of 4-8 carbon atoms in the alcohol component. Precipitation of the latex is then effected under continued agitation. Precipitation can be accomplished, for example, thermally or using coagulants. The thus-modified suspension polymer is subsequently obtained by ordinary removal by filtration and drying.
Inventors
- 👤 Karsten Flatau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:30
CPC Classifications
C; C08; C08L; C08L27/00; C08L27/02; C08L27/04; C08L27/06; C08L33/00; C08L33/04; C08L33/06; C08L33/10; C08L33/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A process for producing polyvinyl chloride which is processable by high speed calendering comprising suspension polymerizing vinyl chloride in the presence of a monomer-soluble catalyst and a protective colloid as suspension stabilizer; after the polymerization, adding 0.1-3% by weight, based on the amount of polyvinyl chloride of a latex of a copolymer of 75-95% by weight of methyl methacrylate, 0-20% by weight of styrene, and 5-25% by weight of an acrylic acid ester of a C 4-8 -alkanol, the total weight percentage adding up to 100, while agitating the mixture; precipitating the latex onto the polyvinyl chloride while continuing the agitation; and, thereafter, separating the resultant modified suspension polyvinyl chloride by filtration and drying.
Claim 2
Dependent Claim
114 words
A process for producing polyvinyl chloride which is processable by high speed calendering comprising suspension polymerizing vinyl chloride in the presence of a monomer-soluble catalyst and a protective colloid as suspension stabilizer; after the polymerization, adding 0.1-3% by weight, based on the amount of polyvinyl chloride of a latex of a copolymer of 75-95% by weight of methyl methacrylate, 0-20% by weight of styrene, and 5-25% by weight of an acrylic acid ester of a C 4-8 -alkanol, the total weight percentage adding up to 100, while agitating the mixture; precipitating the latex onto the polyvinyl chloride while continuing the agitation; and, thereafter, separating the resultant modified suspension polyvinyl chloride by filtration and drying.
Claim 3
Dependent Claim
21 words
A process of claim 1, wherein the precipitation of the latex onto the polyvinyl chloride is effected by adding a coagulant.
Claim 4
Dependent Claim
40 words
A process of claim 1, wherein the precipitation of the latex onto the polyvinyl chloride is effected thermally by maintaining the polymer mixture, after addition of the latex, at a temperature of 50°-90° C. under continued agitation for 1-60 minutes.
Claim 5
Dependent Claim
39 words
A process of claim 1, 2 or 3 wherein the copolymer added is of 80-90% by weight of methyl methacrylate, 5-10% by weight of styrene, and 5-10% by weight of an acrylic acid ester of a C 4-8 alkanol.
Claim 6
Dependent Claim
27 words
A process of claim 1 or 3, wherein the acrylic acid ester of the copolymer is an acrylic acid butyl ester or an acrylic acid 2-ethylhexyl ester.
Claim 7
Dependent Claim
29 words
A process of claim 1, wherein 0.1-0.3% by weight, based on the amount of polyvinyl chloride, of a mold lubricant is added simultaneously with the latex of the copolymer.
References Cited (Backward Citations)
US3720761A
Cited
US3652727A
Cited
US3867481A
Cited
US3882198A
Cited
US3925510A
Cited
US3919137A
Cited
US3991135A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-10-03 | 1987-04-04 | 1987-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-10-03 | 1991-04-04 | 1991-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-10-03 | 1995-04-04 | 1995-10-04 | $7700.00 | Window Closed / Lapsed |