Patent ID: 6036869
Filing Date: 2000-03-14
Classification: B01D,C01F,C02F

Abstract:
A method for manufacturing high molecular weight emulsion copolymers by free radical polymerization of monomers comprising the steps of:a) adding from about 1.5 to about 4.0 weight percent based on copolymer of at least one surfactant solution to a reactor;b) adding an amount from about 0.1 to about 1.0 weight percent based on copolymer of an antifoam to said solution;c) cooling the solution formed in step b to 10.degree. C.;d) adding one third of the total amount of said monomers in a single portion to the cooled solution of step c);e) continuously adding from about 1 ppm to about 5 ppm of redox initiators to the solution of step d) such that the solution is maintained at a temperature of about 5 to about 15.degree. C. until polymerization of the monomers is essentially complete; andf) repeating said steps d and e twice more.