Method for preparing thermoplastic resin

专利名称：Method for preparing thermoplastic resin发明人：Hyung-Sub Lee,Yun-Chang Jang申请号：US10204219申请日：20020819公开号：US06593424B2公开日：20030715

摘要：A method for continuously preparing a heat resistant &agr;-methylstyrene-acrylonitrile copolymer by bulk polymerization, comprising the steps of: a) Continuouslycharging a mixture of monomers including following materials into a continuous

polymerization system with two or more stirred-vessel reactors connected in series: i) 60to 75% (by weight of Yá-methylstyrene; ii) 25 to 40% by weight of acrylonitrile; iii) 5 to15% by weight of a solvent; and iv) 0.05 to 0.3% by weight of a mixed initiator of anorganic peroxide with a multifunctional group and an organic peroxide with a

monofunctional group; b) Continuously polymerizing the monomer mixture charged atstep a) starting from the first reactor to convert 50 to 70% by weight of total chargedmonomers into a polymer; and c) transferring reacted liquid containing the polymer fromstep b) to an evaporator, and then separating the polymer by evaporating unreactedmonomers and solvents. Heat resistant &agr;-methylstyrene-acrylonitrile copolymerresins prepared by the method of the present invention are superior in terms of

conversion rate, heat resistance and heat stability. Heat resistant ABS resins which containthis copolymer resins exhibit excellent impact strength and processability and low heatdiscoloration.

申请人：LG CHEM, LTD.

代理机构：Birch, Stewart, Kolasch & Birch, LLP

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