Method for graft polymerization of diene polymer

Claim 1

Method for producing impact resistant rubber modified thermoplastic resin containing from about 5 to 35% by weight of rubber component comprising a. in a first process step, emulsion graft polymerizing 5 to 40 parts by weight of at least one unsaturated monomer which is selected from the group consisting of unsaturated monomers represented by the general formula ##SPC2## wherein R 1 is --H or --CH 3 , R 2 is selected from the group consisting of --H, alkyl group in the range of C 1 -- C 3 , and --Cl, ##EQU7## wherein R 3 is --H, or --CH 3 , and ##EQU8## wherein R 4 is --H, or --CH 3 , R 5 is --H, or an alkyl group in the range of C 1 - C 5 , with 95 to 60 parts by weight of a latex polymer obtained by homopolymerization or copolymerization of conjugated diene monomer, of which the glass transition temperature is below 0°C; b. in a second process step, mixing the grafted rubber polymer latex obtained from the first process step with about 50 to 400 parts by weight based on 100 parts by weight of grafted polymer, of at least one unsaturated monomer, which is selected from the above described group, and extracting the rubber polymer particles from said latex into said monomer to obtain two phases, one such phase being a monomer phase in which said grafted rubber polymer particles are dispersed without changing substantially the particle size in latex, and the other being a water phase, then removing said water phase; and c. in a third process step, bulk polymerizing the grafted rubber polymer particle dispersed monomer solution.