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US 9,309,192 B1Granted
Preparation and thermal curing of single-ring Bis(cyanate) ester monomers
AssigneeThe United States of America as represented by the Secretary of the Navy
InventorMichael E Wright
Life of this patent
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Abstract
A class of modified single-ring cyanate esters which have shown the ability to tailor and control the glass-transition (Tg) of the cured resins as well as the water uptake.
Claims6
A method for preparing 3,5-bis(cyanato)benzoate esters, comprising:
- preparing a mixture 3,5-dihydroxybenzoic acid and at least one amine;
- heating said mixture in the presence of an acid catalyst;
- purifying said 3,5-dihydroxybenzamide (III) from said mixture:
- treating (III) with cyanogen halide in the presence of at least one base and one solvent;
- isolating said 3,5-bis(cyanato)benzamide (IV) from said treated (III):
- Rt and R2 are each 1-30 carbons;
- and
- purifying said 3,5-bis(cyanato)benzamide (IV) to attain a cyanate ester monomer capable of forming thermally cured resins.
5 more elements
Dependencies are inferred from the claim text.