Nippon Paint Compnay, Ltd.

Katsumi Mizuguchi

Shinichi Ishikura

Keizou Ishii

Koichi Saito

Yoshitaka Okude

Hiroshi Miwa

Hidefumi Okuda

Yasuhiro Shibai

Tsuyoshi Imamura

Naoya Yabuuchi

Masanori Ohiwa

A photochromic brightening pigment comprises a brightening pigment and a photochromic material which is encapsulated so as to adhere it to the surface of the brightening pigment.

Photochromic brightening pigment

Polymer particles having a small particle diameter and a narrow particle diameter distribution are obtained by a continuous polymerization method which does not accompany an increase of cohering products attaching to an inner face of a reaction vessel and an air-bubble invasion and, in which stirring of a material solution for polymerization is easy. An emulsion polymerization reaction or a suspension polymerization reaction is carried out by supplying a material solution for polymerization continuously to a clearance between coaxial double cylinders, which have stretched toward a direction crossing a horizontal plane, from the end side of the cylinders, by rotating at least one of the double cylinders round the axis and thereby, causing Taylor vortices. The polymer particles thus-formed are obtained by through from the other end side of the double cylinders to the outside.

Continuous polymerization method and apparatus

Disclosed is a coating composition curable at a low temperature, comprising (A) a hydroxyl-containing compound, (B) a metal chelate compound or a metal alcoholate compound and (C) a compound having an acid anhydride group. The composition further comprises a chelate-forming compound (D) and/or a tertiary amine (E).

Coating composition curable at a low temperature

Polymer particles having a small particle diameter and a narrow particle diameter distribution are obtained by a continuous polymerization method which does not accompany an increase of cohering products attaching to an inner face of a reaction vessel and an air-bubble invasion and, in which stirring of a material solution for polymerization is easy. An emulsion polymerization reaction or a suspension polymerization reaction is carried out by supplying a material solution for polymerization continuously to a clearance between coaxial double cylinders, which have stretched toward a direction crossing a horizontal plane, from the end side of the cylinders, by rotating at least one of the double cylinders round the axis and thereby, causing Taylor vortices. The polymer particles thus-formed are obtained by through the other end side of the double cylinders to the outside.

Disclosed is composite hollow particles which are excellent in solvent resistance and mechanical stability and have strong walls and which can be easily synthesized. The composite hollow particles are prepared by uniformly dispersing the following ingredients in an aqueous medium;

Composite hollow particles

Disclosed are pigment composite particles which are superior in water resistance, weather resistance, thermal stability and hardness. The pigment composite particles are prepared by suspension-polymerizing an aqueous suspension comprising

Pigment composite particles prepared by suspension polymorization

The present invention provides a curable composition which is cured at a relatively low temperature and, when cured, exhibits excellent physical properties. The curable composition comprises;

Curable composition

A metal chelate compound in which a chelate forming metal is coordinated with a ligand represented by the formula ##STR1## wherein R.sup.1, R.sup.2 and R.sup.3, which are the same or different, represent a hydrogen atom or an alkyl group having 1 to 3 carbon atoms, X represents --NR.sup.4 -- (wherein R.sup.4 represents a hydrogen atom or an alkyl group having 1 to 3 carbon atoms), an oxygen atom or a sulfur atom, n is an integer of 1 to 3, and j is an integer of 1 to 3, and a coating composition containing the same.

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Ibaraki, Japan

Katsumi Mizuguchi