Blend of dicyanate esters of dihydric phenols
AssigneeInterez, Inc.
InventorDavid Shimp
Life of this patent
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Abstract
Blends of ortho substituted dicyanate esters and unsubstituted dicyanate esters when partially reacted to form co-prepolymers are appreciably lower in viscosity at process temperatures than the homo-prepolymers of a particular dicyante. When cured, the blends exhibit excellent heat and moisture resistance properties. The cured compositions are useful in structural composites, filmed structural adhesives and printed wiring boards.
Claims18
A curable composition consisting essentially of a blend of dicyanate esters in the amounts of about 90 to about 10 parts by weight of an ortho substituted dicyanate ester and about 10 to about 90 parts of an unsubstituted dicyanate ester, the total being 100 parts, wherein the ortho substituted dicyanate ester has the structural formula:
- ##STR3## and the unsubstituted dicyanate ester has the structural formula:
- ##STR4## wherein X is methylene, isopropylidene, oxygen (--O--), or divalent sulfur (--S--).
A curable composition consisting essentially of a blend of dicyanate esters in the amounts of about 30 to about 50 parts by weight of bis(4-cyanato-3,5-dimethylphenyl)methane and about 70 to about 50 parts by weight of bis(4-cyanatophenyl)-2,2-propane, the total being 100 parts.
Dependencies are inferred from the claim text.