US4085264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing copolymers of acrylic acid or methacrylic acid and acrylic and methacrylic acid esters
Assignee: BASF SE
•
Filing: 1977-04-04
•
Granted: 1978-04-18
•
Expires: 1997-04-04
Abstract
Abstract A process for the manufacture of copolymers by copolymerizing acrylic acid or methacrylic acid with esters of acrylic acid and methacrylic acid in the presence of polymerization initiators, in which methyl methacrylate, acrylic acid and/or methacrylic acid and a higher alkyl acrylate are copolymerized.
Inventors
- 👤 Karl Seib
- 👤 Wolfgang Schwarz
- 👤 Hermann Gausepohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:02
CPC Classifications
A; A61; A61Q; A61Q5/00; A61Q5/06; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8141; A61K8/8152; C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12; C08F220/14; Y; Y10; Y10S; Y10S526/00; Y10S526/936
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
120 words
In a process for the manufacture of copolymers by copolymerizing acrylic acid or methacrylic acid with esters of acrylic acid and of methacrylic acid in the presence of initiators which form free radicals, the improvement which comprises copolymerizing -- based on total weight of the monomers -- (a) from 45 to 80% of methyl methacrylate, (b) from 10 to 30% of one or more alkyl acrylates where alkyl is of 3 to 12 carbon atoms and (c) from 10 to 25% of acrylic acid and/or methacrylic acid at temperatures of from 140° to 300° C, pressures of from 2 to 50 bars and with a monomer residence time sufficient to provide copolymers having molecular weights of from 500 to 4000.
Claim 2
Dependent Claim
120 words
In a process for the manufacture of copolymers by copolymerizing acrylic acid or methacrylic acid with esters of acrylic acid and of methacrylic acid in the presence of initiators which form free radicals, the improvement which comprises copolymerizing -- based on total weight of the monomers -- (a) from 45 to 80% of methyl methacrylate, (b) from 10 to 30% of one or more alkyl acrylates where alkyl is of 3 to 12 carbon atoms and (c) from 10 to 25% of acrylic acid and/or methacrylic acid at temperatures of from 140° to 300° C, pressures of from 2 to 50 bars and with a monomer residence time sufficient to provide copolymers having molecular weights of from 500 to 4000.
Claim 3
Dependent Claim
15 words
A process as set forth in claim 1, wherein the copolymerization is carried out continuously.
Claim 4
Dependent Claim
20 words
A process as set forth in claim 1, wherein the copolymerization is carried out in the presence of organic solvents.
Claim 5
Dependent Claim
19 words
A process as set forth in claim 1, wherein the polymerization is carried out in the absence of regulators.
Claim 6
Dependent Claim
16 words
A process as set forth in claim 1, wherein, after copolymerization, the copolymers obtained are neutralized.
Claim 7
Dependent Claim
18 words
A process as set forth in claim 5, wherein after copolymerization, the copolymers are 50 to 80% neutralized.
Claim 8
Dependent Claim
20 words
A process as set forth in claim 1 wherein said monomer residence time is from about 3 to 60 minutes.
References Cited (Backward Citations)
US2790736A
Cited
US3194777A
Cited
US2892788A
Cited
US3317493A
Cited
US3577517A
Cited
US3657175A
Cited
US3957740A
Cited
US3860699A
Cited
US3970633A
Cited
US3940351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-04-17 | 1981-10-17 | 1982-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-04-17 | 1985-10-17 | 1986-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-04-17 | 1989-10-17 | 1990-04-18 | $7700.00 | Window Closed / Lapsed |