An aspect of the present invention is a resin composition containing an acrylic resin obtained by polymerizing a monomer component including: a first monomer represented by formula (1); and a second monomer copolymerizable with the first monomer and having a reactive group.

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[In the formula, R.sup.1 represents a hydrogen atom or a methyl group, and R.sup.2 represents a group having a polyoxyalkylene chain.]

The present invention relates to a pigment water dispersion containing a pigment, a crosslinked polymer and water, in which the crosslinked polymer is prepared by crosslinking a carboxy group-containing polymer with a crosslinking agent, and has an acid value of not less than 70 mgKOH/g and not more than 300 mgKOH/g; and the pigment water dispersion further contains a formaldehyde-releasing compound. The pigment water dispersion of the present invention is excellent in storage stability even when being stored under high-temperature conditions for a long period of time.

The present invention relates to a pigment water dispersion containing a pigment, a crosslinked polymer and water, in which the crosslinked polymer is prepared by crosslinking a carboxy group-containing polymer with a crosslinking agent, and has an acid value of not less than 70 mgKOH/g and not more than 300 mgKOH/g; and the pigment water dispersion further contains a formaldehyde-releasing compound. The pigment water dispersion of the present invention is excellent in storage stability even when being stored under high-temperature conditions for a long period of time.

Provided are a planographic printing plate precursor including a support, and an image recording layer in this order, in which the image recording layer contains polymer particles containing an addition polymerization type resin, and the addition polymerization type resin contains a polymerizable group and a hydrophilic structure; a method of producing a planographic printing plate using the planographic printing plate precursor; a planographic printing method using the planographic printing plate precursor; and a curable composition containing the polymer particles.

Provided are a planographic printing plate precursor including a support, and an image recording layer in this order, in which the image recording layer contains polymer particles containing an addition polymerization type resin, and the addition polymerization type resin contains a polymerizable group and a hydrophilic structure; a method of producing a planographic printing plate using the planographic printing plate precursor; a planographic printing method using the planographic printing plate precursor; and a curable composition containing the polymer particles.

The present disclosure provides, as a film structure useful for a probe of a biosensor, a film structure comprising a detection layer including an analyte-responsive enzyme; and a protection film formed on the detection layer, in which the protection film includes alone poly(styrene-ran-4-vinylpyridine-ran-propyleneglycol methacrylate); or the protection film includes a copolymer mixture including poly(styrene-ran-4-vinylpyridine-ran-propyleneglycol methacrylate); and poly(4-vinylpyridine)-block-poly(C.sub.1-15 alkyl methacrylate), or poly(4-vinylpyridine-ran-2-hydroxyethyl methacrylate).

The present disclosure provides, as a film structure useful for a probe of a biosensor, a film structure comprising a detection layer including an analyte-responsive enzyme; and a protection film formed on the detection layer, in which the protection film includes alone poly(styrene-ran-4-vinylpyridine-ran-propyleneglycol methacrylate); or the protection film includes a copolymer mixture including poly(styrene-ran-4-vinylpyridine-ran-propyleneglycol methacrylate); and poly(4-vinylpyridine)-block-poly(C.sub.1-15 alkyl methacrylate), or poly(4-vinylpyridine-ran-2-hydroxyethyl methacrylate).

The invention provides a novel oil thickener that can impart a thickening effect for oils used in cosmetics, and a novel oil-soluble copolymer that can be used as the thickener.

The cosmetic oil thickener of the invention is an oil-soluble copolymer having a monomer unit composed of a hydrophilic monomer, a monomer unit composed of an easily-crystallizing hydrophobic monomer, and a monomer unit composed of a poorly-crystallizing hydrophobic monomer.

Copolymers derived from hydrophobic monomers of formula (1), and hydrophilic monomers of formulas (2) and (3), are provided ##STR00001##
The copolymers are useful as gelling agents for oils used in cosmetics and cosmetic emulsions.

Copolymers derived from hydrophobic monomers of formula (1), and hydrophilic monomers of formulas (2) and (3), are provided ##STR00001##
The copolymers are useful as gelling agents for oils used in cosmetics and cosmetic emulsions.