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    • 4. 发明专利
    • STAR TYPE COPOLYMER AND PRODUCTION THEREOF
    • JPH03190911A
    • 1991-08-20
    • JP33159889
    • 1989-12-20
    • NIPPON PAINT CO LTD
    • OHATA MASATOSHIFUJIMOTO TERUOKAZAMA TAKEOHASHIMOTO TAKEJIHASEGAWA HIROICHI
    • C08F297/02
    • PURPOSE:To obtain the title copolymer having different arms by subjecting an anion-polymerizable monomer to anion polymerization, then adding a protecting hydroxyl group-containing monomer to the living growth end, subjecting another monomer to block copolymerization and polymerizing a third monomer with a deprotecting hydroxyl group salt. CONSTITUTION:(A) An anion-polymerizable monomer is subjected to anion polymerization using an organic alkali metal as an initiator, a protecting hydroxyl group-containing diphenylethylene derivative shown by formula I (R1 is H or 1-3C alkyl; R2 is direct bond and 1-3C alkyl; R3 to R5 are 1-3C alkyl; Z is Si or C) is added to the living growth end of the formed polymer of the component A and the formed addition product is used as an initiator. (B) An anion- polymerizable monomer is subjected to anion-polymerization, a hydroxyl- protecting group of the compound shown by formula I at the chain center of the formed block copolymer is removed to give an alkali metal salt, which is used as an initiator. (C) An anion-polymerizable monomer is polymerized to give a star type copolymer shown by formula II (A', B' and C' are polymerized repeating units of the components A, B and C; x, y and z are degree of polymerization).