Resin particle comprising microparticle made of a crystalline resin, and method for producing the same

摘要

A resin particle having a sufficiently narrow particle size distribution obtainable by using a supercritical fluid, and a production method for obtaining a resin particle having a sufficiently narrow particle size distribution by using a supercritical fluid are provided. The present invention provides a resin particle (C) having a microparticle (A) fixed to or formed as a film on a surface of a resin particle (B) containing a resin (b), wherein the degree of swelling of the microparticle (A) by liquid or supercritical carbon dioxide (X) at a temperature lower than the glass transition temperature or the melting point of the microparticle (A) is 16% or less, and the microparticle (A) is at least one kind selected from the group consisting of a crystalline resin (a1), a noncrystalline resin (a2), and an inorganic compound (a3).

主权项

1. A resin particle (C) comprising a microparticle (A) fixed to or formed as a film on a surface of a resin particle (B) containing a resin (b),
wherein the degree of swelling of the microparticle (A) by liquid or supercritical carbon dioxide (X) at a temperature lower than the glass transition temperature or the melting point of the microparticle (A) is 16% or less, and the microparticle (A) is made of a crystalline resin (a1), wherein the crystalline resin (a1) is at least one kind selected from the group consisting of the following (a11) to (a14): (a11) a crystalline polyester containing a straight-chain aliphatic diol having an alkylene chain with 2 to 50 carbon atoms and a straight-chain aliphatic dicarboxylic acid having an alkylene chain with 2 to 50 carbon atoms as essential constitutional units, wherein the total number of the number of carbon atoms in the alkylene chain of the diol and the number of carbon atoms in the alkylene chain of the dicarboxylic acid is 12 to 52, and further containing an aromatic dicarboxylic acid with 6 to 30 carbon atoms as a constitutional unit as necessary, (a12) a crystalline polyurethane and/or polyurea containing a straight-chain aliphatic diol having an alkylene chain with 2 to 50 carbon atoms and/or a straight-chain aliphatic diamine having an alkylene chain with 2 to 50 carbon atoms, and a straight-chain aliphatic diisocyanate having an alkylene chain with 2 to 50 carbon atoms as essential constitutional units, and has the total number of the average number of carbon atoms in the alkylene chain of the diol and/or the diamine, and the number of carbon atoms in the alkylene chain of the diisocyanate of 10 to 52, (a13) a crystalline vinyl resin containing an alkyl (meth)acrylate having 12 to 50 carbon atoms in the alkyl group as an essential constitutional unit, and (a14) a crystalline vinyl resin containing (meth)acrylonitrile and a crystalline vinyl monomer as essential constitutional units.