Patent US3897404A successfully refreshed from Google Patents.
US3897404A
Expired / Lapsed
US
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Process for the production of copolymers containing acrylic acid amides
Assignee: Bayer AG
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Filing: 1973-04-11
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Granted: 1975-07-29
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Expires: 1993-04-11
Abstract
Abstract The invention provides a process for the production of ternary and quaternary copolymers containing N,N-disubstituted acrylic acid amides which comprises reacting polyacrylic acid-C1-C4-alkyl ester with secondary alkyl or cycloalkyl monoamines in aprotic solvents at temperatures of from 100* to 250*C and under pressure of from 0 to 100 atms. The reaction products according to the invention are particularly suitable for use as thickeners for printing pastes and as gloss stabilisers for modacrylic filaments and films.
Inventors
- 👤 Siegfried Korte
- 👤 Carlhans Suling
- 👤 Gunter Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:10
CPC Classifications
C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
22 words
A PROCESS FOR THE PRODUCTION OF WATER-SOLUBLE COPOLYMERS CONSISTING ESSENTIALLY OF RECURRING STRUCTURAL UNITS CORRESPONDING TO THE FORMULAE (A), (B), AND (C)
Claim 2
Dependent Claim
22 words
A PROCESS FOR THE PRODUCTION OF WATER-SOLUBLE COPOLYMERS CONSISTING ESSENTIALLY OF RECURRING STRUCTURAL UNITS CORRESPONDING TO THE FORMULAE (A), (B), AND (C)
Claim 3
Dependent Claim
24 words
A process as claimed in claim 1, wherein the reaction is carried out in dimethyl formamide, dimethylacetamide or N-methyl pyrrolidone as the aprotic solvent.
Claim 4
Dependent Claim
32 words
Water-soluble terpolymers obtained by the polymer-analogue reaction of polyacrylic acid methyl ester with secondary amines in aprotic solvents, consisting essentially of recurring structural units corresponding to the formulae (a), (b) and (c)
Claim 5
Dependent Claim
32 words
Water-soluble terpolymers obtained by the polymer-analogue reaction of polyacrylic acid methyl ester with secondary amines in aprotic solvents, consisting essentially of recurring structural units corresponding to the formulae (a), (b) and (c)
Claim 6
Dependent Claim
70 words
Water-soluble terpolymers as claimed in claim 3, wherein their average chemical composition is limited by the concentration ranges 50 to 97 mol % of acrylic acid amide (a) 2.5 to 35 mol % of acrylic acid (b) 0.5 to 15 mol % of acrylic acid methyl ester (c) with the further condition that the molar ratio of acrylic acid to acrylic acid methyl ester amounts to between 1:6 and 70:1.
References Cited (Backward Citations)
US2476527A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-07-28 | 1979-01-27 | 1979-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-28 | 1983-01-27 | 1983-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-28 | 1987-01-27 | 1987-07-29 | $7700.00 | Window Closed / Lapsed |