Patent ID: 11939413
Assignee: MITSUBISHI CHEMICAL CORPORATION
Field: Macromolecular chemistry, polymers (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. An acrylic resin powder, comprising:
a multi-stage polymer (M) comprising:
a polymer (B) obtained by polymerizing a monomer mixture (b) in the presence of a polymer dispersion of a polymer (A) obtained by polymerizing a monomer mixture (a) containing 50% to 60% by mass of methyl methacrylate and an alkyl (meth)acrylate ester (ma);
wherein
the monomer mixture (b) comprises:
50% to 90% by mass of methyl methacrylate,
10% to 50% by mass of an alkyl (meth)acrylate ester (mb), and
0% to 10% by mass of a copolymerizable monomer different from methyl methacrylate and the alkyl (meth)acrylate ester (mb),
the alkyl group of the alkyl (meth)acrylate ester (ma) has 4 to 8 carbon atoms,
the alkyl group of the alkyl (meth)acrylate ester (mb) bas 4 to 8 carbon atoms,
a glass transition temperature of the polymer (A) is 20° C. or lower,
a glass transition temperature of the polymer (B) is 55° C. or higher,
the acrylic resin powder is soluble in acetone, and
a mass average molecular weight of the multi-stage polymer (M) is 10,000 or more and 300,000 or less.