Bifunctional aromatic cyanates, prepolymers and electrical lamin

Details Bifunctional aromatic cyanates, prepolymers and electrical lamin Bifunctional aromatic cyanates, prepolymers and electrical lamin

1994-04-15

1996-01-30

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Cyanate esters

C07C26102

Patent

active

054881447

ABSTRACT:
A novel dicyanate ester of the formula: ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 are the same or different and each is hydrogen, alkyl, perfluoroalkyl, aryl or halogen; A is a bridge selected from the group consisting of direct bond, methylene optionally mono- or di-substituted by alkyl, perfluoroalkyl and/or aryl, a five or six membered cycloalkylene, sulfonyl, thio, oxy, carbonyl, phenylene, and xylylene optionally substituted by alkyl at one or both methylene carbon atoms; with the proviso that when the cyanato group is at the para-position relative to the bridge A, both R.sub.1 and R.sub.2 are not hydrogen, and its prepolymer are useful in the manufacture of electrical laminates having excellent dielectric properties in GHz region.

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Chem Abtract 79:105605; Korshak et al; 1973.
Chemical Abstracts 114(20): 187155s, 1990.
Chemical Abstracts, vol. 79, No. 17, Oct. 29, 1973, 105605k.
H. Hoyer, Chemische Berichte, vol. 94, No. 4, 1961.

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