Patent ID: 9187580
Filing Date: 2015-11-17
Classification: A61K,A61Q,B32B,C08F,G02B

Abstract:
1. A light diffusing agent comprising a resin particle having many recesses on the surface thereof, comprising a seed particle, wherein a component part of said seed particle has a crosslinked structure; said seed particle is a resin formed of at least one monomer having a silyl group selected from the group consisting of 3-(meth)acryloxypropyl methyl dimethoxysilane, 3-(meth)acryloxypropyl trimethoxysilane, 3-(meth)acryloxypropyl methyl diethoxysilane, and 3-(meth)acryloxypropyl triethoxysilane, and other monomers, wherein an amount of the other monomers used in the resin particle having many recesses on the surface thereof is 100 to 900 parts by mass with respect to 100 parts by mass of the monomer having a silyl group; and said resin particle is obtained by seed-polymerizing a monomer for seed polymerization in a solvent which is at least one selected from the group consisting of acetone, acetonitrile, N,N-dimethylformamide, dimethyl sulfoxide, 1-butanol, 2-propanol, 1-propanol, ethanol, methanol, and a mixed solvent of water with one or more of the preceding solvents in the presence of said seed particle, and crosslinking at least a part of said seed particle in the presence of said seed particle, and crosslinking at least a part of said seed particle.