Patent ID: 7812073

Claim:
A method for preparation of small particle sized polybutadiene latex for ABS, comprising the steps of: providing the following weight percent of ingredients: butadiene 34.00~45.00%, a second monomer 0~6.0%, desalinized water 52.11~63.13%, tert-dodecylthiol (TDM) 0.12~0.22%, emulsifying agent 0.80~2.60%, electrolyte 0.12~0.32%, K 2 S 2 O 8 0.06~0.20%, adding the ingredients, including an amount in the range of about 80% to 90% of the 0.80 -2.60% by weight percent of the emulsifying agent, into a polymerization reactor; stirring and heating for polymerization; controlling the temperature for polybutadiene polymerization within a range of from about 60° C. to 75° C.; allowing for a reaction time in a range of about 9 to 12 hours; and adding the remainder of the emulsifying agent when the conversion reaches a range of about 60% to 80%; wherein the emulsifying agent is prepared by mixing about 1 part potassium oleate to about 0.2 to 0.8 parts potassium abietate; and wherein the second monomer is selected from the group consisting of styrene, acrylonitrile, and methyl methacrylate.