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ABA type block copolymers

  • US 5,314,962 A
  • Filed: 06/29/1993
  • Issued: 05/24/1994
  • Est. Priority Date: 04/07/1987
  • Status: Expired due to Fees
First Claim
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1. An ABA block copolymer represented by the following formula I:

  • ##STR15## wherein;

    two R1 s, which may be different or identical, stand for a hydrocarbyl group having 1 to 3 carbon atoms,two R2 s, which may be different or identical, stand for a hydrogen atom or a hydrocarbyl group having 1 to 3 carbon atoms,M1 stands for an acrylic ester residue represented by the following formula (a);

    ##STR16## wherein;

    R3 is a hydrocarbyl group having 1 to 18 carbon atoms, which may or may not be replaced with an alkoxy or hydroxy group, wherein M1 contains less than 5% by weight with respect to said acrylic ester residue of at least one monomer selected from the group consisting of acrylic acid, methacrylic acid, aromatic vinyl derivatives and vinyl acetate,M2 stands for at least one residue selected from a methacrylic acid or ester residue represented by the following formula (b);

    ##STR17## wherein R4 is a hydrocarbyl group having 1 to 4 carbon atoms or a hydrogen atom;

    an aromatic vinyl residue represented by the following formula (c);

    ##STR18## wherein R5 is a hydrogen atom or a methyl group, andR6 is a phenyl or alkylphenyl group;

    or a maleimido residue represented by the following formula (d);

    ##STR19## wherein R7 is a hydrocarbyl group having 1 to 12 carbon atoms, or a phenyl or alkylphenyl group, and n and m each stand for a natural number of 20 to 5000, the copolymer having two glass transition temperatures such that a first glass transition temperature is equivalent to a homopolymer of the monomer M1 and a second glass transition temperature is equivalent to a homopolymer of the monomer M2, the first glass transition temperature being substantially lower than the second glass transition temperature.

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