Hitachi, Ltd.

Hitachi Chemical Company, Ltd.

Shun-ichi Numata

Hitoshi Yokono

Noriyuki Kinjo

Koji Fujisaki

Junji Mukai

Junichi Imaizumi

Yoshikatsu Mikami

Akio Nishikawa

A resin material comprising a polyamide having as chemical structural unit at least one aromatic ring which can rotate around its molecular axis but has no flexibility at another direction, said polyimide being oriented at least at a uniaxial direction, has a low thermal expansion coefficient and can be shaped together with an inorganic material into one body to give a composite shaped article.

Low thermal expansion resin material and composite shaped article

A resin material comprising a polyimide having as chemical structural unit at least one aromatic ring which can rotate around its molecular axis but has no flexibility at another direction, said polyimide being oriented at least at a uniaxial direction, has a low thermal expansion coefficient and can be shaped together with an inorganic material into one body to give a composite shaped article.

A novel thermosetting resin composition consisting essentially of (a) one equivalent of a polyfunctional epoxy compound containing 10 to 80% by weight of a polyglycidyl ester of a fatty acid, (b) 1.5 to 5 equivalents of a polyfunctional isocyanate compound and (c) 0.01 to 10% by weight of a curing catalyst based on the total weight of the polyfunctional epoxy compound and the polyfunctional isocyanate compound. A cured product having excellent thermal resistance and excellent thermal shock resistance which is suitable for the molding of a large apparatus can be obtained by heating said thermosetting resin composition.

Thermosetting resin composition

A novel thermosetting resin composition consisting essentially of (a) an isocyanate group-terminated condensate obtained by reacting a polycarboxylic acid compound having at least one acid anhydride ring with a stoichiometrical excess of a polyfunctional isocyanate compound or said condensate containing the unreacted isocyanate compound, (b) a polyfunctional epoxy compound and (c) a catalyst which forms mainly isocyanurate rings and oxazolidone rings. A cured product having excellent thermal resistance and excellent high temperature strength can be obtained by heating said composition.

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Hitachi, Japan

Shun-ichi Numata