Patent ID: 6465083
Filing Date: 2002-10-15
Classification: C08K,C08L,H05K,Y10S,Y10T

Abstract:
A method of manufacturing varnish of a modified cyanate ester group curable resin composition which comprises the steps of:dissolving (C) a polyphenylene ether resin into (F) an aromatic hydrocarbon solvent with heating to provide a solution; and reacting (A) a cyanate ester group compound having two cyanate groups in a molecule with (B) a monovalent phenolic compound in said solution in the presence of (E) a metallic reaction catalyst to generate a mutually dissolving solution of a modified cyanate ester resin and a polyphenylene resin, an added quantity of (B) the monovalent phenolic compound in said solution being 4 to 30 parts by weight to 100 parts by weight of (A) the cyanate ester group compound having two cyanate groups in the molecule, a quantity of (C) the polyphenylene ether resin in said solution being 5 to 300 parts by weight to 100 parts by weight of (A) the cyanate ester group compound having two cyanate groups in the molecule, wherein said (A) cyanate ester group compound is expressed by chemical formula (1), where, R1 is â€ƒand R2 and R3 is any one of hydrogen or methyl group, and the both can be the same or different from each other, and wherein said (B) monovalent phenolic group compound is expressed by chemical formula (2), or formula (3), â€ƒwherein R4 and R5 is any one of hydrogen atom or low alkyl group having 1 to 4 carbon atoms, and the both can be the same or different from each other, n is a positive integer of 1 or 2, â€ƒwhere, R6 is any one of â€”CH, â€”CH2CH3,