To provide a modified vinylaromatic copolymer which can be used in production of copolymer rubber and which has reactivity and solubility, and a copolymer rubber material obtained therefrom, which simultaneously has processability, strength, and homogeneity. The modified vinylaromatic copolymer is a copolymer containing a structural unit (a) derived from a divinylaromatic compound and a structural unit (b) derived from a monovinylaromatic compound, wherein the structural unit (a) at least partially includes the following crosslinked structural unit (a1), and a terminal is modified by a modification group having at least one functional group selected from the group consisting of an amino group, a hydroxyl group, and an alkoxysilyl group.

To provide a modified vinylaromatic copolymer which can be used in production of copolymer rubber and which has reactivity and solubility, and a copolymer rubber material obtained therefrom, which simultaneously has processability, strength, and homogeneity. The modified vinylaromatic copolymer is a copolymer containing a structural unit (a) derived from a divinylaromatic compound and a structural unit (b) derived from a monovinylaromatic compound, wherein the structural unit (a) at least partially includes the following crosslinked structural unit (a1), and a terminal is modified by a modification group having at least one functional group selected from the group consisting of an amino group, a hydroxyl group, and an alkoxysilyl group.

The invention relates to a method of producing amidomethylated vinylaromatic bead polymers.

The invention relates to a method of producing amidomethylated vinylaromatic bead polymers.

Provided is a thermoplastic resin composition which includes: a first graft copolymer including a C.sub.4 to C.sub.10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a second graft copolymer including a C.sub.4 to C.sub.10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a first styrene-based copolymer being a copolymer of a monomer mixture including a C.sub.1 to C.sub.3 alkyl-substituted styrene-based monomer, a vinyl cyan-based monomer, and a C.sub.1 to C.sub.3 alkyl (meth)acrylate-based monomer, wherein the first graft copolymer and the second graft copolymer have cores having mutually different average particle diameters. The thermoplastic resin composition is excellent in colorability, weather resistance, tensile strength, flexural strength, and impact strength.

Provided is a thermoplastic resin composition which includes: a first graft copolymer including a C.sub.4 to C.sub.10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; a second graft copolymer including a C.sub.4 to C.sub.10 alkyl (meth)acrylate-based monomer unit, an aromatic vinyl-based monomer unit, and a vinyl cyan-based monomer unit; and a first styrene-based copolymer being a copolymer of a monomer mixture including a C.sub.1 to C.sub.3 alkyl-substituted styrene-based monomer, a vinyl cyan-based monomer, and a C.sub.1 to C.sub.3 alkyl (meth)acrylate-based monomer, wherein the first graft copolymer and the second graft copolymer have cores having mutually different average particle diameters. The thermoplastic resin composition is excellent in colorability, weather resistance, tensile strength, flexural strength, and impact strength.

The multilayer coating film formation method for forming a multilayer coating film on a substrate comprises the steps of: applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film; applying a topcoat paint composition (Y) containing a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film; and simultaneously heating the uncured first coating film and the uncured second coating film to cure the films.

The multilayer coating film formation method for forming a multilayer coating film on a substrate comprises the steps of: applying an undercoat paint composition (X) comprising an antioxidant (a1) to a substrate to form at least one layer of an uncured first coating film; applying a topcoat paint composition (Y) containing a carboxy-containing polymer (b1) and an epoxy-containing acrylic resin (b2) to the first coating film to form an uncured second coating film; and simultaneously heating the uncured first coating film and the uncured second coating film to cure the films.

A photochromic curable composition comprising a radically polymerizable monomer having at least one oxetanyl group in one molecule, a photochromic compound and radically polymerizable monomers other than the above polymerizable monomer, and a photochromic cured body obtained by polymerizing the photochromic curable composition.

A photochromic curable composition comprising a radically polymerizable monomer having at least one oxetanyl group in one molecule, a photochromic compound and radically polymerizable monomers other than the above polymerizable monomer, and a photochromic cured body obtained by polymerizing the photochromic curable composition.