Patent ID: 7163992
Filing Date: 2007-01-16
Classification: C08F

Abstract:
1. A method for producing a copolymer, comprising the steps of: preparing a monomer mixture comprising raw material monomers, wherein said raw material monomers contain at least a first vinyl monomer having an alkyl group in the α-position at 40–70 wt. % and styrene at 0–30 wt. % with respect to the total amount of said raw material monomer mixture; heating a reactor in a temperature range between 160 and 350° C. and supplying said monomer mixture into said reactor whereby a reaction liquid is formed within said reactor in a first reaction step, wherein said reaction liquid contains said raw material monomers and polymers formed by reacting said raw material monomers, wherein the concentration of said raw material monomers and said polymers is in a range between 70 and 100 wt. %, and wherein said polymers contain at least one macromonomer at a concentration in a range between 60 and 100 wt. %; and reacting said polymers with a second vinyl monomer in a second reaction step to obtain said copolymer.