Fine resin particle, coating film-softening agent, matting agent for paints, stress reliever for curable resins, light diffuser, light diffusing resin composition, and resin composition
AssigneeSekisui Kasei Co., Ltd.
InventorKohei Mitani
Life of this patent
Estimating the term…
Abstract
The present invention provides a fine resin particle that has superior softness and improved brittleness and may be used in paint compositions, cosmetics, and the like. The fine resin particle of the present invention includes a copolymer that includes an alkyl (meth)acrylate-based monomer (A) unit having a C10-30 alkyl group, an alkyl acrylate-based monomer (B) unit having a C1-5 alkyl group, a vinyl monomer (C) unit having a homopolymer glass transition temperature Tg of 70° C. or higher and one polymerizable unsaturated bond, and a multifunctional (meth)acrylate-based monomer (D) unit.
Claims16
A fine resin particle comprising a copolymer that includes an alkyl (meth)acrylate-based monomer (A) unit having a C10-30 alkyl group, an alkyl acrylate-based monomer (B) unit having a C1-5 alkyl group, a vinyl monomer (C) unit having a homopolymer glass transition temperature Tg of 70° C. or higher and one polymerizable unsaturated bond, and a multifunctional (meth)acrylate-based monomer (D) unit,
- wherein a content of the alkyl (meth)acrylate-based monomer (A) unit is 20 to 85 parts by mass in relation to 100 parts by mass of the total of the alkyl (meth)acrylate-based monomer (A) unit, the alkyl acrylate-based monomer (B) unit, the vinyl monomer (C) unit, and the multifunctional (meth)acrylate monomer-based (D) unit,
- wherein a content of the alkyl acrylate-based monomer (B) unit is 5 to 40 parts by mass in relation to 100 parts by mass of the total of the alkyl (meth)acrylate-based monomer (A) unit, the alkyl acrylate-based monomer (B) unit, the vinyl monomer (C) unit, and the multifunctional (meth)acrylate monomer-based (D) unit,
- wherein the alkyl acrylate-based monomer (B) does not have a hydrophilic structure,
- wherein a content of the vinyl monomer (C) unit is 5 to 30 parts by mass in relation to 100 parts by mass of the total of the alkyl (meth)acrylate-based monomer (A) unit, the alkyl acrylate-based monomer (B) unit, the vinyl monomer (C) unit, and the multifunctional (meth)acrylate monomer-based (D) unit,
- wherein the vinyl monomer (C) does not have a hydrophilic structure,
- wherein the multifunctional (meth)acrylate-based monomer (D) unit has a content of 5 to 50 parts by mass in relation to 100 parts by mass of the total of the alkyl (meth)acrylate-based monomer (A) unit, the alkyl acrylate-based monomer (B) unit, the vinyl monomer (C) unit, and the multifunctional (meth)acrylate-based monomer (D) unit,
- wherein a mass ratio of the content of the vinyl monomer (C) unit to the content of the multifunctional (meth)acrylate-based monomer (D) unit [vinyl monomer (C) unit content/multifunctional (meth)acrylate-based monomer (D) unit content] is 0.3 to 2, and
- wherein the fine resin particle shows no inflection point in a compressive displacement-compressive load curve in a compression test when the fine resin particle is compressed to a load of 9.81 mN and a primary particle of the fine resin particle has a compressive strength at 10% compressive strength upon initial compression at 25° C. of 1 to 10 MPa.
Dependencies are inferred from the claim text.