METHOD OF MAKING VARNISH OF MODIFIED CYANATE ESTER GROUP CURABLE RESIN COMPOSITION, AND PREPREG, METAL CLAD LAMINATED BOARD, FILM, PRINTED CIRCUIT BOARD, AND MULTILAYERED CIRCUIT BOARD USING THE COMPOSITION
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United States of America Patent
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Oct 15, 2002
Issued Date -
N/A
app pub date -
Sep 20, 2000
filing date -
Jul 4, 1997
priority date (Note) -
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Abstract
A modified cyanate ester group curable resin composition, and varnishes, prepregs, laminated boards adhered with metal foil, films, printed circuit boards, and multilayered circuit boards using the same, comprising: (A) a cyanate ester group compound expressed by chemical formula (1), ##STR1## (where, R.sub.1 is ##STR2## and respective of and R.sub.2 and R.sub.3 is any one of hydrogen or methyl group, and the both can be the same or different from each other, (B) a monovalent phenolic group compound expressed by chemical formula (2), or formula (3), ##STR3## where R.sub.4 and R.sub.5 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. ##STR4## (where, R.sub.6 is ##STR5## or ##STR6## (C) a polyphenylene ether resin, (D) a flame retardant not reactive with the cyanate ester group compound, and (E) a metal group reaction catalyst.
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