Patent ID: 9040065
Filing Date: 2015-05-26
Classification: A61K,A61Q,C08F

Abstract:
1. A process for the preparation of polymers, the polymers comprising in a polymerized-in form, a. M1a+M2a=30 to 70% by weight of an ester of (meth)acrylic acid with a C1-C4-alcohol; b. M1b+M2b=30 to 70% by weight of (meth)acrylic acid; c. M1c+M2c=0.1 to 20% by weight of monomer substituted with at least one C8-C30-radical; and M1d+M2d=0 to 20% by weight of monomers different from a) to c), the process comprising emulsion polymerization with a first polymerization stage followed by a second polymerization stage, wherein the first polymerization stage includes i) providing an initial charge comprising the monomer part amounts M1a, M1b, M1c, and M1d, water, and optionally a surface-active agent, to form a first monomer mixture; ii) heating the first monomer mixture (i) to a temperature in the range of about 30 to 120° C.; and iii) adding a polymerization initiator to form a first reaction mixture, and wherein the second polymerization stage includes iv) adding the monomer part amounts M2a, M2b, M2c, and M2d to the first reaction mixture (iii) to form a second reaction mixture; and v) after-treatment of the second reaction mixture (iv), wherein