(Meth)acrylic polymer particle, process for production of the particle, plastisol, and article

A method for producing a (meth)acrylic polymer particle for a plastisol wherein a surface layer is produced by polymerizing a monomer mixture (Y), comprising:

• polymerizing a monomer (X) having a (meth)acryloyl group to produce a polymer particle, and
• polymerizing a monomer mixture (Y) in the presence of the polymer particle,
• wherein the monomer (X) is 90 to 99.9% by mass and the monomer mixture (Y) is 0.1 to 10% by mass in terms of the ratio among monomer raw materials to be supplied for polymerization;
• and the monomer mixture (Y) comprises 1 to 80% by mol of a monomer (a) having a blocked isocyanate as a functional group which is capable of deblocking at 50 to 120° C., 5 to 80% by mol of a (meth)acrylate monomer (b) of at least one alcohol selected from the group consisting of an aliphatic alcohol having 2 or more carbon atoms, an aromatic alcohol, and a cyclic alkyl alcohol, and 0 to 94% by mol of a monomer (c) other than the monomer (a) and the monomer (b), and
• wherein 0.01 to 1% by mol of a chain transfer agent to the total amount of the monomer mixture (Y) is added when the monomer mixture (Y) is polymerized.