Abstract An improved process for rapidly preparing amino methylated derivatives of dilute aqueous solutions of acrylamide polymers which comprises the steps: A. Preparing a 2.8-6% aqueous solution of an acrylamide polymer which has a molecular weight of at least 500,000; B. Adding to the solution formed in A approximately 1 mole of formaldehyde and approximately 1 mole of a dialkyl amine which contains from 2-4 carbon atoms based on the amide content of the acrylamide polymer under conditions of good agitation; C. Reacting the acrylamide polymer with the formaldehyde and the dialkyl amine at a temperature between 80-100° C. for a period of time ranging between 2-15 minutes to form an amino methylated acrylamide polymer. C 1 -C 4 alkyl quaternary ammonium salt derivatives of these amino methylated acrylamide polymers may be prepared by adjusting the pH to 8.4-8.7 and reacting them with a lower alkyl quaternizing agent at a temperature ranging between 50°-80° C. for a period of time ranging between 2-5 minutes.
Inventors
👤 Kenneth G. Phillips
👤 Edward G. Ballweber
👤 John R. Hurlock
Bibliographic Details
Application Number—
JurisdictionUS
Data Sourcegoogle_patents
Last Synchronized2026-11-08 11:44
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/44
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
114 words
An improved process for rapidly preparing amino methylated derivatives of dilute aqueous solutions of acrylamide polymers which comprises the steps: A. Preparing a 2.8-6% aqueous solution of an acrylamide polymer which has a molecular weight of at least 500,000; B. Adding to the solution formed in A approximately 1 mole of formaldehyde and approximately 1 mole of a dialkyl amine which contains from 2-4 carbon atoms based on the amide content of the acrylamide polymer under conditions of good agitation; C. Reacting the acrylamide polymer with the formaldehyde and the dialkyl amine at a temperature between 80°-100° C. for a period of time ranging between 2-15 minutes to form an amino methylated acrylamide polymer.
Claim 2
Dependent Claim
114 words
An improved process for rapidly preparing amino methylated derivatives of dilute aqueous solutions of acrylamide polymers which comprises the steps: A. Preparing a 2.8-6% aqueous solution of an acrylamide polymer which has a molecular weight of at least 500,000; B. Adding to the solution formed in A approximately 1 mole of formaldehyde and approximately 1 mole of a dialkyl amine which contains from 2-4 carbon atoms based on the amide content of the acrylamide polymer under conditions of good agitation; C. Reacting the acrylamide polymer with the formaldehyde and the dialkyl amine at a temperature between 80°-100° C. for a period of time ranging between 2-15 minutes to form an amino methylated acrylamide polymer.
Claim 3
Dependent Claim
47 words
The method of claim 1 where the acrylamide polymer is in the form of a 3-5% aqueous solution and its molecular weight is at least 1,000,000; the lower dialkyl amine is dimethylamine and the temperature and time of the reaction is 80° C. for about 15 minutes.
Claim 4
Dependent Claim
22 words
The method of claim 2 where the temperature and time of the reaction is conducted at 100° C. for about 2 minutes.
Claim 5
Dependent Claim
82 words
A method of preparing a C 1 -C 4 alkyl quaternary ammonium salt derivative of the amino methylated acrylamide polymer prepared in accordance with claim 1 which comprises the steps of adjusting the pH and the lower dialkyl amino methylated acrylamide polymer to between 8.4-8.7 and then reacting the amino methylated acrylamide polymer with about 1 mole of a C 1 -C 4 alkyl quaternizing agent at a temperature ranging between 50°-80° C. for a period of time ranging between 2-5 minutes.
Claim 6
Dependent Claim
22 words
The method of claim 4 where the alkyl quaternizing agent is selected from the group consisting of dimethyl sulfate and methyl bromide.