Nhk Spring Co., Ltd.

Sumitomo Chemical Company, Limited

Nobuaki Koyama

Shitomi Katayama

Hideto Komurasaki

Kazuhiko Konomi

Hajime Shimabukuro

Takeshi Kondo

Ryo Miyakoshi

Kouichi Kusakawa

Kiyoshi Jin

Tomoyuki Itou

A liquid composition containing a liquid crystalline polyester, a solvent, and a boron nitride having a volume average particle diameter of not less than 10 &#x3bc;m and not more than 80 &#x3bc;m, wherein the amount of the boron nitride is 30 to 90% by volume based on the total amount of the liquid crystalline polyester and the boron nitride.

Liquid composition and metal-based circuit board

Provided is an electrical insulating resin composition capable of forming an electrical insulating layer which has excellent flexibility and board adhesiveness, together with high thermal resistance and high humidity resistance, tolerates a high temperature treatment at soldering and can be stably used for a long time under a harsh environment with high temperature and vibration in an automobile. A resin composition containing as organic components at least a rubber like polymer compound (A) composed of a copolymer of an aromatic vinyl compound and a conjugated diene compound and a polymerizable monomer (B) having one or more terminal reactive double bonds is employed as the electrical insulating resin composition. The compound (A) may be partially hydrogenated. The composition may optionally contain an oligomer (C) having a ring structure and having a reactive unsaturated bond in the molecule thereof.

Electrical insulating resin composition, and laminate for circuit board

A urea compound having carboxylate radical is obtained by reaction of aminoaminocarboxylate represented by the formula: ##STR1## (where R.sub.1 l is a hydrocarbon-based radical, and R.sub.2 is ethylene radical or a substituted ethylene radical) with diisocyanate, optionally in the presence of diamine and/or water. The reaction may be achieved by interfacial polymerization, solution polymerization, or solvent-free polymerization.

Urea compound having carboxylate radical and method for producing the

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Yokohama, Japan

Nobuaki Koyama