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US 2006/0235195 A1Published application
Synthesis of oligomeric cyanate esters
AssigneeThe Government of the US, as represented by the Secretary of the Navy
InventorsTeddy Keller, Matthew Laskoski
Life of this patent
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Abstract
A cyanate ester system is disclosed. An aryl ether oligomer may be made from a dihydroxyaromatic compound and a dihaloaromatic compound in the presence of a base. The oligomer is then reacted with a cyanide compound in the presence of a base to form the cyanate ester shown below. The cyanate ester may then be cross-linked to a thermoset having triazine ring cross-links. HO—Ar2O—Ar1—O—Ar2nOH
Claims20
An oligomer comprising the formula:
- HO—Ar3—R—Ar2O—Ar1—O—Ar3R—Ar2nOH;
- wherein Ar1 is a divalent aromatic radical selected from the group consisting of substituted or unsubstituted phenyl, substituted or unsubstituted o-phenyl, substituted or unsubstituted m-phenyl, and substituted or unsubstituted p-phenyl;
- wherein Ar2 and Ar3 are independently selected divalent aromatic radicals selected from the group consisting of a substituted or unsubstituted aromatic ring, substituted or unsubstituted fused aromatic rings, and a substituted or unsubstituted aromatic ring assembly without intervening groups;
- wherein R is a substituted or unsubstituted divalent organic or sulfone group;
- and
- wherein n is a positive integer.
3 more elements
A process comprising the steps of:
- providing a dihydroxyaromatic compound;
- providing a dihaloaromatic compound;
- and
- reacting the dihydroxyaromatic compound with the dihaloaromatic compound in the presence of a copper compound and a base other than cesium carbonate.
1 more element
Dependencies are inferred from the claim text.