Process for the production of high molecular weight copolymers of diallylammonium monomers and acrylamide monomers in solution
First Claim
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1. A process for the preparation of a water-soluble, linear copolymer of diallyl ammonium monomer and acrylamide monomer having a uniform diallyl ammonium monomer to acrylamide monomer ratio comprising the steps of:
- a) initiating the copolymerization of a stirred mixture of diallyl ammonium monomer with a portion of the total amount of acrylamide monomer required in a solvent solution at a temperature at which copolymerization proceeds;
b) adding to said stirred monomer solution the remaining acrylamide monomer by continuous addition to form a homogeneous gel solution, while maintaining the reaction temperature;
c) after completion of the addition of acrylamide, maintaining the reaction mixture at the polymerization temperature for a period of about 30 minutes to about 1 hour to complete polymerization;
d) after the polymerization is completed homogeneously mixing a chain transfer agent in said gel solution to form a gel mixture;
e) heating said gel mixture to a temperature at which residual monomer undergoes copolymerization; and
f) drying said gel mixture.
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Abstract
Water-soluble, high molecular weight, linear copolymers of a diallyl ammonium monomer and an acrylamide monomer of various cationicities are prepared by copolymerization of a major portion of the acrylamide monomer via stage-addition in a solvent solution and adding a chain transfer agent at the conclusion of said copolymerization to prevent branching and cross-linking from occurring.
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Citations
12 Claims
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1. A process for the preparation of a water-soluble, linear copolymer of diallyl ammonium monomer and acrylamide monomer having a uniform diallyl ammonium monomer to acrylamide monomer ratio comprising the steps of:
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a) initiating the copolymerization of a stirred mixture of diallyl ammonium monomer with a portion of the total amount of acrylamide monomer required in a solvent solution at a temperature at which copolymerization proceeds; b) adding to said stirred monomer solution the remaining acrylamide monomer by continuous addition to form a homogeneous gel solution, while maintaining the reaction temperature; c) after completion of the addition of acrylamide, maintaining the reaction mixture at the polymerization temperature for a period of about 30 minutes to about 1 hour to complete polymerization; d) after the polymerization is completed homogeneously mixing a chain transfer agent in said gel solution to form a gel mixture; e) heating said gel mixture to a temperature at which residual monomer undergoes copolymerization; and f) drying said gel mixture. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification