US3941724A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of amphoteric resins in a reaction medium comprising formic acid
Assignee: Commonwealth Scientific and Industrial Research Organisation
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Filing: 1974-07-26
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Granted: 1976-03-02
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Expires: 1994-07-26
Abstract
Abstract In the known process of manufacturing an amphoteric polymeric composition which process comprises firstly polymerising a mixture comprising a monomer containing a basic group and a monomer containing an acidic group, the improvement of carrying out the process in the presence of a solvent system comprising formic acid.
Inventors
- 👤 Brian Alfred Bolto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 21:15
CPC Classifications
C; C08; C08F; C08F2/00; C08F2/04; C08F2/06
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
In the process of manufacturing a polymeric composition which process comprises firstly polymerizing a mixture comprising a monomer containing a basic group, said monomer being an ethylenically unsaturated substituted amine, and a monomer containing an acidic group, said latter monomer being an unsaturated carboxylic acid; the improvement of carrying out the process in the presence of a solvent system comprising formic acid.
Claim 2
Dependent Claim
62 words
In the process of manufacturing a polymeric composition which process comprises firstly polymerizing a mixture comprising a monomer containing a basic group, said monomer being an ethylenically unsaturated substituted amine, and a monomer containing an acidic group, said latter monomer being an unsaturated carboxylic acid; the improvement of carrying out the process in the presence of a solvent system comprising formic acid.
Claim 3
Dependent Claim
17 words
A process according to claim 1 wherein formic acid comprises a major proportion of the solvent system.
Claim 4
Dependent Claim
28 words
A process according to claim 1 wherein the weight ratio of formic acid to acidic monomer is in the range from 1 : 5 to 5 : 1.
Claim 5
Dependent Claim
29 words
A process according to claim 1 wherein the ethylenically unsaturated substituted amine is chosen from the group consisting of triallylamine, methyl-diallylamine, ethyl-diallylamine, 1,4-bis(N,N-diallylaminomethyl) benzene, 2,4,6-tris(N,N-diallylaminomethyl)toluene, 1,2,4-tris(N,N-diallylaminomethyl)benzene, 1,6-bis(N,N-diallylamino)hexane, n-propylidiallylamine, benzyldiallylamine.
Claim 6
Dependent Claim
31 words
A process according to claim 1 wherein the unsaturated carboxylic acid is chosen from the group consisting of maleic acid, vinylacetic acid, allylacetic acid, maleamic acid, N-alkylmaleamic acids and N-arylmaleamic acids.
Claim 7
Dependent Claim
17 words
A process according to claim 1 wherein the unsaturated carboxylic acid is acrylic acid or methacrylic acid.
Claim 8
Dependent Claim
17 words
A process according to claim 1 wherein the polymerization is initiated by a chemical free radical generator.
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) | 1979-03-02 | 1979-09-01 | 1980-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-02 | 1983-09-01 | 1984-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-02 | 1987-09-01 | 1988-03-02 | $7700.00 | Window Closed / Lapsed |