Resin particle having many recesses on the surface thereof

Patent metadata

Field	Value
Publication number	US-9187580-B2
Application number	US-99101009-A
Country	US
Kind code	B2
Filing date	May 11, 2009
Priority date	May 21, 2008
Publication date	Nov 17, 2015
Grant date	Nov 17, 2015

Abstract

The present invention provides a resin particle having many recesses on the surface thereof, which has solvent resistance and heat resistance. More specifically, the present invention provides a resin particle having many recesses on the surface thereof which is obtained by using a seed particle, wherein a seed particle component in the resin particle has a crosslinked structure. Since the resin particle having many recesses on the surface thereof of the present invention is excellent in solvent resistance and heat resistance in addition to light diffusing properties, the resin particle is appropriate for use, for example, in not only cosmetics containing silicone oil and the like in a preparation, a light diffusing film and a light diffusing sheet prepared by dispersing resin particles as a light diffusing agent in an organic solvent such as 2-butanone and the like in a production process, and a light diffusing plate prepared by kneading at a high shear force the resin particles as a light diffusing agent with polystyrene or polymethyl methacrylate and the like which melts at a high temperature of approximately 300° C. in a production process.

First claim

The invention claimed is:

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.

2. The light diffusing agent according to claim 1 , wherein the method for seed polymerization is a seed dispersion polymerization method.

3. A light diffusing film obtained by applying the light diffusing agent of claim 1 to a film resin with a binder.

4. A light diffusing sheet obtained by applying the light diffusing agent of claim 1 to a sheet resin with a binder.

5. A light diffusing plate obtained by mixing to disperse the light diffusing agent of claim 1 in a transparent matrix resin, and forming it.

6. The light diffusing agent according to claim 1 , wherein the solvent is at least one selected from the group consisting of 1-butanol, 2-propanol, 1-propanol, ethanol, methanol, and a mixed solvent of water with one or more of the preceding solvents.

Assignees

• Hamamoto Shigeki
• Kawata Hirotsugu
• Yamaguchi Kiyoshi
• Okubo Masayoshi
• Sumitomo Seika Chemicals

Inventors

• Hamamoto Shigeki
• Kawata Hirotsugu
• Yamaguchi Kiyoshi
• Okubo Masayoshi

Classifications

• C08F212/08

  Styrene · CPC title

• C08F8/00

  Chemical modification by after-treatment (graft polymers, block polymers, crosslinking with unsaturated monomers or with polymers C08F251/00 - C08F299/00; of conjugated diene rubbers C08C) · CPC title

• C08F220/28

  containing no aromatic rings in the alcohol moiety · CPC title

• B32B27/308

  comprising acrylic (co)polymers · CPC title

• C08F230/08

  containing silicon · CPC title