Patent US4096133A successfully refreshed from Google Patents.
US4096133A
Expired / Lapsed
US
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Method for quaternizing polymers of water-soluble aminovinyl monomers
Assignee: Dow Chemical Co
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Filing: 1977-02-28
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Granted: 1978-06-20
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Expires: 1997-02-28
Abstract
Abstract In the preparation of polyquaternary ammonium salts by alkylation of polymers of water-soluble ethylenically unsaturated amines such as a dialkylamino methylacrylamide with a quaternizing agent such as an alkyl halide in an aqueous solution of the polymer, more rapid and complete alkylation is obtained when the reaction is carried out in an acidic medium containing a lower alkanol such as methanol.
Inventors
- 👤 Maurice L. Zweigle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:52
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
77 words
In a method for the preparation of an inherently water-dispersible polyquaternary-ammonium derivative of an amine polymer wherein a quaternizing agent is reacted with a inherently water-dispersible polymer having a polyethylenic backbone and a plurality of pendant tertiary amino groups in an aqueous medium, the improvement which comprises adjusting the aqueous medium to a pH of about 7 or less and incorporating therein a catalytic amount of a water-soluble alcohol and contacting said medium with the quaternizing agent.
Claim 2
Dependent Claim
77 words
In a method for the preparation of an inherently water-dispersible polyquaternary-ammonium derivative of an amine polymer wherein a quaternizing agent is reacted with a inherently water-dispersible polymer having a polyethylenic backbone and a plurality of pendant tertiary amino groups in an aqueous medium, the improvement which comprises adjusting the aqueous medium to a pH of about 7 or less and incorporating therein a catalytic amount of a water-soluble alcohol and contacting said medium with the quaternizing agent.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the amine polymer is a polymer of an N-dialkyl aminomethyl substituted ethylenically unsaturated amide.
Claim 4
Dependent Claim
36 words
The method of claim 2 wherein the amine polymer is a N-dialkylaminomethyl derivative of an acrylamide polymer which is a polyacrylamide on which from 20 to 100 percent of the carboxamide groups carry a dimethylaminomethyl substituent.
Claim 5
Dependent Claim
42 words
The method of claim 2 wherein alcohol is an alkanol having 1 to 4 carbons and is employed in the amount of from about 5 to about 15 percent by weight based on the amount of amine polymer in the reaction mixture.
Claim 6
Dependent Claim
26 words
The method of claim 4 wherein the reaction is carried out at a temperature of from about 40° C to the boiling temperature of the medium.
Claim 7
Dependent Claim
20 words
The method of claim 1 wherein the quaternizing agent is a primary alkyl chloride containing 1 to 4 carbon atoms.
Claim 8
Dependent Claim
21 words
The method of claim 1 wherein the quaternizing agent is a dialkyl sulfate wherein alkyl has from 1 to 2 carbons.
Claim 9
Dependent Claim
19 words
The method of claim 1 wherein the quaternizing agent is an epihalohydrin which contains 3 to 8 carbon atoms.
Claim 10
Dependent Claim
24 words
The method of claim 1 wherein the quaternizing agent is methyl chloride or ethyl chloride and the reaction is carried out at superatmospheric pressure.
Claim 11
Dependent Claim
12 words
The method of claim 4 wherein the quaternizing agent is methyl chloride.
Claim 12
Dependent Claim
34 words
The method of claim 10 wherein the alkanol is employed in the amount of from about 5 to about 15 percent by weight based on the weight of N-dimethylaminomethyl-acrylamide polymer in the reaction mixture.
Claim 13
Dependent Claim
10 words
The method of claim 4 wherein the alkanol is methanol.
Claim 14
Dependent Claim
30 words
The method of claim 12 wherein the methanol is supplied from residual formalin remaining from the preparation of the N-dialkylaminomethyl derivative of polyacrylamide by reacting polyacrylamide with formalin and dialkylamine.
Claim 15
Dependent Claim
23 words
The method of claim 1 wherein the aqueous solution of amine polymer is dispersed in an oil phase to form a water-in-oil emulsion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |