In order to address the problems of conventional photochromic compounds, which are the insufficient coloring/discoloring speed and durability exhibited thereby and the large number of production steps, the present invention provides a photochromic compound that exhibits a high speed coloring/discoloring reaction and high durability while it is able to be synthesized in low cost, and that has industrial applicability. The compound of the present invention is characterized by the insertion of a diarylimidazolyl radical into the ortho position of an aryl group. The compound exhibits photochromic properties, and achieves a photochromic compound having both a high speed color switching reaction and high durability. Furthermore low cost synthesis is possible, and the photochromic compound has industrial applicability.

In order to address the problems of conventional photochromic compounds, which are the insufficient coloring/discoloring speed and durability exhibited thereby and the large number of production steps, the present invention provides a photochromic compound that exhibits a high speed coloring/discoloring reaction and high durability while it is able to be synthesized in low cost, and that has industrial applicability. The compound of the present invention is characterized by the insertion of a diarylimidazolyl radical into the ortho position of an aryl group. The compound exhibits photochromic properties, and achieves a photochromic compound having both a high speed color switching reaction and high durability. Furthermore low cost synthesis is possible, and the photochromic compound has industrial applicability.

The present invention relates to the use of N-hydroxybenzotriazole derivatives, in particular N-hydroxybenzotriazole salts and/or N-hydroxyindazoles, in particular N-hydroxyindazole salts as flame retardant for plastic materials. The present invention relates in addition to a flame-retardant plastic material moulding compound which comprises N-hydroxybenzotriazole derivatives and/or N-hydroxyindazole derivatives as flame retardant.

A pigment dispersion containing a pigment, a non-water-soluble solvent, a compound in which an specific azo skeleton structure is bonded to a specific polymer having a monomer unit given, and a polymer compound having a monomer unit that contains a structure selected from the partial structures given by the specific formulas (3) and (4).

A pigment dispersion containing a pigment, a non-water-soluble solvent, a compound in which an specific azo skeleton structure is bonded to a specific polymer having a monomer unit given, and a polymer compound having a monomer unit that contains a structure selected from the partial structures given by the specific formulas (3) and (4).

An actinic ray-sensitive or radiation-sensitive resin composition includes a resin having a solubility in a developer, which changes by the action of an acid, a compound that generates an acid upon irradiation with actinic rays or radiation; and an acid diffusion control agent, in which a molecular weight of the acid diffusion control agent is 420 or more, and a distance Ra between a Hansen solubility parameter of the acid diffusion control agent and a Hansen solubility parameter of the air satisfies 15Ra45.

An actinic ray-sensitive or radiation-sensitive resin composition includes a resin having a solubility in a developer, which changes by the action of an acid, a compound that generates an acid upon irradiation with actinic rays or radiation; and an acid diffusion control agent, in which a molecular weight of the acid diffusion control agent is 420 or more, and a distance Ra between a Hansen solubility parameter of the acid diffusion control agent and a Hansen solubility parameter of the air satisfies 15Ra45.

The invention provides compositions of chloroprene rubbers having improved vibration-damping properties under low temperature conditions without deterioration of mechanical properties, permanent compression set and tension fatigue in the final product. The chloroprene rubbers of the invention contain a xanthogen-modified chloroprene rubber and/or a mercaptan-modified chloroprene rubber in an amount of 100 parts by mass, a carbon black having an average particle diameter of 70 mn to 600 mn and a DBP oil absorption (as determined by Absorption A method of JIS-K6221) of 15 ml/100 g in an amount of 15 to 150 parts by mass, and a plasticizer represented by the chemical formula R.sub.1COO(CH.sub.2).sub.8COOR.sub.2 wherein R.sub.1 and R.sub.2 each represent an alkyl group having 1 to 7 carbons.

The invention provides compositions of chloroprene rubbers having improved vibration-damping properties under low temperature conditions without deterioration of mechanical properties, permanent compression set and tension fatigue in the final product. The chloroprene rubbers of the invention contain a xanthogen-modified chloroprene rubber and/or a mercaptan-modified chloroprene rubber in an amount of 100 parts by mass, a carbon black having an average particle diameter of 70 mn to 600 mn and a DBP oil absorption (as determined by Absorption A method of JIS-K6221) of 15 ml/100 g in an amount of 15 to 150 parts by mass, and a plasticizer represented by the chemical formula R.sub.1COO(CH.sub.2).sub.8COOR.sub.2 wherein R.sub.1 and R.sub.2 each represent an alkyl group having 1 to 7 carbons.

The invention provides compositions of chloroprene rubbers having improved vibration-damping properties under low temperature conditions without deterioration of mechanical properties, permanent compression set and tension fatigue in the final product. The chloroprene rubbers of the invention contain a xanthogen-modified chloroprene rubber and/or a mercaptan-modified chloroprene rubber in an amount of 100 parts by mass, a carbon black having an average particle diameter of 70 mn to 600 mn and a DBP oil absorption (as determined by Absorption A method of JIS-K6221) of 15 ml/100 g in an amount of 15 to 150 parts by mass, and a plasticizer represented by the chemical formula R.sub.1COO(CH.sub.2).sub.8COOR.sub.2 wherein R.sub.1 and R.sub.2 each represent an alkyl group having 1 to 7 carbons.