US4522997A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crosslinking agents for water-swellable polymers
Assignee: Sanofi Aventis Deutschland GmbH
•
Filing: 1983-06-06
•
Granted: 1985-06-11
•
Expires: 2003-06-06
Abstract
Abstract Crosslinked, water-swellable copolymers are produced with a crosslinking agent comprising an N-(2'alkenyl)-3-methylenepyrrolidin-2-one of the formula ##STR1## wherein R 1 , R 2 and R 3 are the same or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
Inventors
- 👤 Hermann Schmitz
- 👤 Klaus Kuhlein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:24
CPC Classifications
C; C08; C08F; C08F226/00; C08F226/06; C08K; C08K5/00; C08K5/16; C08K5/34; C08K5/3412; C08K5/3415
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
93 words
In the process for preparation of crosslinked, water-swellable polymers wherein an olefinic monomer or olefinic monomers are polymerized in the presence of a crosslinking agent at temperatures from 0° to 130° C., and the polymerization is initiated by high-energy radiation or chemical catalysts, the improvement comprises said crosslinking agent being 0.001 to 2% by weight, based on monomer to be polymerized, of a compound of the formula ##STR14## wherein R 1 , R 2 and R 3 are identical or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
Claim 2
Dependent Claim
93 words
In the process for preparation of crosslinked, water-swellable polymers wherein an olefinic monomer or olefinic monomers are polymerized in the presence of a crosslinking agent at temperatures from 0° to 130° C., and the polymerization is initiated by high-energy radiation or chemical catalysts, the improvement comprises said crosslinking agent being 0.001 to 2% by weight, based on monomer to be polymerized, of a compound of the formula ##STR14## wherein R 1 , R 2 and R 3 are identical or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
Claim 3
Dependent Claim
28 words
The process according to claim 1 wherein the cross-linking agent R 1 , R 2 and R 3 are identical or different and each is hydrogen or methyl.
Claim 4
Dependent Claim
9 words
Copolymers produced by the process according to claim 1.
Claim 5
Dependent Claim
59 words
Water-swellable polymers of acrylic acid or acrylic acid ester crosslinked by 0.001 to 2% by weight of a compound of the formula ##STR15## present during polymerization of the acrylic acid or acrylic acid ester wherein R 1 , R 2 and R 3 are identical or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
Claim 6
Dependent Claim
59 words
Water-swellable polymers of acrylic acid or acrylic acid ester crosslinked by 0.001 to 2% by weight of a compound of the formula ##STR15## present during polymerization of the acrylic acid or acrylic acid ester wherein R 1 , R 2 and R 3 are identical or different and each is hydrogen or alkyl having 1 to 6 carbon atoms.
Claim 7
Dependent Claim
26 words
Crosslinked, water-swellable polymers according to claim 4 wherein R 1 , R 2 and R 3 are identical or different and each is hydrogen or methyl.
Claim 8
Dependent Claim
25 words
Crosslinked, water-swellable polymers according to claim 4 comprising a copolymer of acrylic acid and acrylamide in a weight ratio of (20 to 80):(80 to 20).
Claim 9
Dependent Claim
26 words
Crosslinked, water-swellable polymers according to claim 6 wherein R 1 , R 2 and R 3 are identical or different and each is hydrogen or methyl.
References Cited (Backward Citations)
US4361689A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-10 | 1988-12-10 | 1989-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-10 | 1992-12-10 | 1993-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-10 | 1996-12-10 | 1997-06-11 | $7700.00 | Window Closed / Lapsed |