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US 5,314,962 AGranted
ABA type block copolymers
AssigneeMitsubishi Petrochemical Co., Ltd.
InventorsTakayuki Otsu, Shunichi Himori, Takashi Kiriyama
Life of this patent
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Abstract
An acrylate is polymerized by the photo-decomposition of ##STR1## to make a polymeric intermediate containing dithiocarbamate groups at both its ends, and a hard polymer-forming monomer is polymerized by the photo-decomposition of this dithiocarbamate group-containing polymeric intermediate to form blocks of a polymer of said hard polymer-forming monomer on both sides of said polymeric intermediate, thereby forming an ABA type block copolymer.
Claims17
An ABA block copolymer represented by the following formula I:
- ##STR15## wherein:
- two R.sup.1 s, which may be different or identical, stand for a hydrocarbyl group having 1 to 3 carbon atoms,
- two R.sup.2 s, which may be different or identical, stand for a hydrogen atom or a hydrocarbyl group having 1 to 3 carbon atoms,
- M.sup.1 stands for an acrylic ester residue represented by the following formula (a):
- ##STR16## wherein:
- R.sup.3 is a hydrocarbyl group having 1 to 18 carbon atoms, which may or may not be replaced with an alkoxy or hydroxy group, wherein M.sup.1 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,
- M.sup.2 stands for at least one residue selected from a methacrylic acid or ester residue represented by the following formula (b):
- ##STR17## wherein R.sup.4 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 R.sup.5 is a hydrogen atom or a methyl group, and
- R.sup.6 is a phenyl or alkylphenyl group;
- or a maleimido residue represented by the following formula (d):
- ##STR19## wherein R.sup.7 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 M.sup.1 and a second glass transition temperature is equivalent to a homopolymer of the monomer M.sup.2, the first glass transition temperature being substantially lower than the second glass transition temperature.
10 more elements
An ABA block copolymer represented by the following formula (I):
- ##STR20## wherein:
- two R.sup.1 S, which may be different or identical, are a hydrocarbyl group having 1 to 3 carbon atoms,
- two R.sup.2 S, which may be different or identical, are a hydrogen atom or a hydrocarbyl group having 1 to 3 carbon atoms,
- M.sup.1 is an acrylic ester residue represented by the following formula (a):
- ##STR21## wherein R.sup.3 is a hydrocarbyl group having 1 to 18 carbon atoms, which may or may not be replaced with an alkoxy or hydroxy group, wherein M.sup.1 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,
- M.sup.2 comprises a maleimido residue having the following formula (d) ##STR22## wherein R.sup.7 is a hydrocarbyl group having 1 to 12 carbon atoms, or a phenyl or alkylphenyl group, and optionally, a residue selected from a methacrylic acid or ester residue having formula (b) ##STR23## wherein R.sup.4 is a hydrocarbyl group having 1 to 4 carbon atoms or a hydrogen atom;
- an aromatic vinyl residue represented by the formula (c):
- ##STR24## wherein R.sup.5 is a hydrogen atom or a methyl group, and R.sup.6 is a phenyl or alkylphenyl group, and n and m are each 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 M.sup.1 and a second glass transition temperature is equivalent to a homopolymer of the monomer M.sup.2, the first glass transition temperature being substantially lower than the second glass transition temperature.
5 more elements
An ABA type block copolymer represented by the structure (I) ##STR25## wherein two R.sup.1 s which may be different or identical, are a hydrocarbyl group having 1 to 3 carbon atoms,
- two R.sup.2 s which may be different or identical, are a hydrocarbyl group having 1 to 3 carbon atoms,
- (M.sup.1).sub.n is a polymer block derived from acrylic esters of the formula (a):
- ##STR26## wherein R.sup.3 is a hydrocarbyl group having 1 to 18 carbon atoms, which may or may not be replaced with an alkoxy or hydroxy group, and optionally including at least one monomer selected from methacrylic acid, acrylic acid, aromatic vinyl derivatives and vinyl acetate;
- (M.sup.2).sub.m is a polymerized block of methyl methacrylate, the number of monomeric units making up each of blocks (M.sup.2).sub.m and (M.sup.1).sub.n being 20 to 5000.
1 more element
Dependencies are inferred from the claim text.