Resin particle and production method therefor, and hydrophilicity imparting agent containing said resin particle

Patent metadata

Field	Value
Publication number	US-12545778-B2
Application number	US-202017598436-A
Country	US
Kind code	B2
Filing date	Feb 27, 2020
Priority date	Mar 29, 2019
Publication date	Feb 10, 2026
Grant date	Feb 10, 2026

Abstract

It is provided that a particulate hydrophilic resin that can be produced under mild conditions, and that has a small load on the environment. A resin particle comprising a crosslinked structure in which at least one of monomers represented by the following general formula (1) and a polyfunctional ethylenically unsaturated monomer are crosslinked,

wherein R 1 represents an alkyl group having 1 to 4 carbon atoms, a hydrogen atom, an alkali metal atom, or an ammonium.

First claim

The invention claimed is:

1 . A resin particle comprising a crosslinked structure in which at least one of monomers represented by the following general formula (1) and a polyfunctional ethylenically unsaturated monomer are crosslinked,

wherein R 1 represents an alkyl group having 1 to 4 carbon atoms, a hydrogen atom, an alkali metal atom, or an ammonium,
wherein the content of a monomer unit derived from the polyfunctional ethylenically unsaturated monomer is not lower than 0.5% by mass based on the resin particle, and
wherein the content of a monomer unit derived from a monomer other than the general formula (1) and the polyfunctional ethylenically unsaturated monomer is not higher than 75% by mass based on the resin particle.

2 . The resin particle according to claim 1 , wherein the polyfunctional ethylenically unsaturated monomer is a non-hydrolyzable monomer.

3 . The resin particle according to claim 1 , wherein the polyfunctional ethylenically unsaturated monomer is a hydrocarbon-based crosslinking agent optionally having an ether bond, and has two or more ethylenically unsaturated bonds.

4 . The resin particle according to claim 1 , wherein the polyfunctional ethylenically unsaturated monomer is at least one of divinylbenzene and 1,3-butadiene.

5 . The resin particle according to claim 1 , wherein a monomer unit derived from the general formula (1) is 30 to 99.99% by mass in total.

6 . The resin particle according to claim 1 , wherein the resin particle has a moisture absorption ratio of not lower than 2.5% by mass.

7 . An aqueous dispersion containing water and the resin particle according to claim 1 dispersed in the water.

8 . The aqueous dispersion according to claim 7 , wherein the resin particle has a volume average particle diameter of 10 nm to 10 μm.

9 . A hydrophilicity imparting agent containing the resin particle according to claim 1 .

10 . A method for producing a resin particle, comprising emulsion polymerization in which at least one of monomers represented by formula (2) and a polyfunctional ethylenically unsaturated monomer are dispersed in an aqueous solvent in the presence of an emulsifier and a polymerization reaction is carried out, thereby producing a crosslinked structure in which at least one of monomers represented by the following general formula (1) and the polyfunctional ethylenically unsaturated monomer are crosslinked,

wherein R 2 represents an alkyl group having 1 to 4 carbon atoms,

wherein R 1 represents an alkyl group having 1 to 4 carbon atoms, a hydrogen atom, an alkali metal atom, or an ammonium,
wherein the content of a monomer unit derived from the polyfunctional ethylenically unsaturated monomer is not lower than 0.5% by mass based on the resin particle, and
wherein the content of a monomer unit derived from a monomer other than the general formula (1) and the polyfunctional ethylenically unsaturated monomer is not higher than 75% by mass based on the resin particle.

11 . The resin particle according to claim 1 , wherein the resin particle has a volume average particle diameter of 100 nm to 10 μm.

12 . The resin particle according to claim 1 , wherein the content of a monomer unit derived from the general formula (1) is not lower than 20% by mass.

13 . The aqueous dispersion according to claim 7 , wherein the resin particle has a volume average particle diameter of 100 nm to 10 μm.

Assignees

• Nippon Catalytic Chem Ind

Inventors

• Matsumoto Kazuaki

Classifications

• C08L25/14

  with unsaturated esters · CPC title

• C08F212/36

  Divinylbenzene · CPC title

• C08F210/12

  with conjugated diolefins, e.g. butyl rubber · CPC title

• C08F20/06

  Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof · CPC title

• C08F2/22

  Emulsion polymerisation · CPC title