| 摘要 |
A novel styrene type resin having excellent strength which comprises (A) a unit represented by the formula <IMAGE> wherein l and n are each an integer of 1 to 20; m is an integer 0 to 5; and R1, R2, R3 and R4 are each a hydrogen atom, an alkyl group having 1 to 5 carbon atoms, a cyclohexyl group or a phenyl group and (B) a unit represented by the formula <IMAGE> wherein R1 is a hydrogen atom or a methyl group and R2 is a hydrogen atom or an alkyl group having 1 to 5 carbon atoms and wherein the ratio of SA (namely, an amount of structural unit (A)) to SB (namely, an amount of structural unit (B)), SA/SB, is in the range of 0.00001 to 0.006; the resin having weight average molecular weight in the range of 200,000 to 600,000; and a total amount of styrene type monomers, styrene type dimers, styrene type trimers and a solvent of not more than 0.8% by weight.
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