(Meth)acrylic copolymer, adhesive composition containing same, and adhesive sheet
AssigneeMitsubishi Chemical Corporation
InventorsEri Kawai, Junichi Nakamura, Hiroko Shinada
Life of this patent
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Abstract
A (meth)acrylic copolymer (A) having a mass average molecular weight of 50,000 to 1,000,000, in which the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer mixture including a macromonomer (a) that has a number average molecular weight of 500 or more and less than 6000 and a vinyl monomer (b), and preferably includes 7 to 40% by mass of a repeat unit derived from the macromonomer (a), has sufficient coating workability, adhesive holding power and adhesive property as an adhesive composition.
Claims17
An adhesive composition comprising a (meth)acrylic copolymer (A) having a mass average molecular weight of 50,000 to 1,000,000,
- wherein the (meth)acrylic copolymer (A) is obtained by polymerizing a monomer mixture comprising a macromonomer (a) having a number average molecular weight of 1,900 or more and 4,500 or less and a vinyl monomer (b),
- wherein the monomer (a) is represented by Formula (1):
- where in Formula (1),
- n is 4 to 5,999;
- each of R and R1 to Rn is independently a hydrogen atom, an alkyl group, a cycloalkyl group, an aryl group or a heterocyclic group, in which the alkyl group, the cycloalkyl group, the aryl group or the heterocyclic group optionally have a substituent;
- each of X1 to Xn is independently a hydrogen atom or a methyl group;
- and
- Z is a terminal group of the macromonomer (a),
- wherein the (meth)acrylic copolymer (A) comprises 7 to 30% by mass of a repeat unit derived from the macromonomer (a),
- wherein the adhesive composition is in a solution state in the presence of at least one of a solvent and a liquid vinyl monomer, or is a hot melt-based adhesive composition without solvent.
Dependencies are inferred from the claim text.