Sumitomo Chemical Company, Limited

Hisashi Watabu

Satoshi Okamoto

Shuichi Kanagawa

Mitsuhiro Shibata

Shinichiro Kitayama

Yasuhiro Endo

Toshiaki Hayashi

Yoichi Ueda

Method for producing high purity cyanate

Provided is a method for purifying a cyanate at high yield from a cyanate crude product solution comprising a cyanate represented by the general formula (1), unsubstituted phenol and non-alcoholic solvent by contacting with a poor solvent containing an alcohol and water, to crystallize the cyanate:

Purification method of cyanate

A cyanate resin composition comprising as essential components a cyanate compound represented by formula (1) or its prepolymer and a curing agent: ##STR1## wherein each of R.sub.1 and R.sub.2 represents a hydrogen atom or an alkyl group having 1 to 5 carbon atoms; A represents an alkyl group having 1 to 3 carbon atoms; i represents an integer of 0 to 3 alone or together with a brominated epoxy compound or a maleimide compound or its prepolymer, said cyanate resin composition giving a cured product having a low-dielectric constant, and a copper-clad laminate composed of a prepreg of said cyanate resin composition and a copper foil.

Cyanite composition and copper-clad laminate using the composition

A cyanate resin composition suitable for a copper-clad laminate comprises components (A) and (B).

Cyanate resin composition and copper-clad laminate

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Hyogo, Japan

Hisashi Watabu