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US 2006/0235196 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
Claims9
A process comprising the steps of:
- providing an oligomer comprising the formula:
- HO—Ar2O—Ar1—O—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 is a divalent aromatic radical selected from the group consisting of a substituted or unsubstituted aromatic ring, substituted or unsubstituted fused aromatic rings, a substituted or unsubstituted aromatic ring assembly with or without interveninig groups, and combinations thereof, with the proviso that when Ar2 is substituted or unsubstituted phenyl, then Ar1 is substituted or unsubstituted m-phenyl, Ar2 is substituted or unsubstituted m-phenyl, or both;
- and
- wherein n is a positive integer;
- and
- reacting the oligomer with a cyanide compound in the presence of a base to form —OCN end groups on the oligomer.
5 more elements
A thermoset comprising the formula:
- 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 is a divalent aromatic radical selected from the group consisting of a substituted or unsubstituted aromatic ring, substituted or unsubstituted fused aromatic rings, a substituted or unsubstituted aromatic ring assembly with or without intervening groups, and combinations thereof, with the proviso that when Ar2 is substituted or unsubstituted phenyl, then Ar1 is substituted or unsubstituted m-phenyl, Ar2 is substituted or unsubstituted m-phenyl, or both;
- and
- wherein n is a positive integer.
1 more element
A process comprising the steps of:
- providing a cyanate ester comprising the formula:
- NCO—Ar2O—Ar1—O—Ar2nOCN
- 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 is a divalent aromatic radical selected from the group consisting of a substituted or unsubstituted aromatic ring, substituted or unsubstituted fused aromatic rings, a substituted or unsubstituted aromatic ring assembly with or without intervening groups, and combinations thereof, with the proviso that when Ar2 is substituted or unsubstituted phenyl, then Ar1 is substituted or unsubstituted m-phenyl, Ar2 is substituted or unsubstituted m-phenyl, or both;
- and
- wherein n is a positive integer;
- and
- curing the cyanate ester to a thermoset.
5 more elements
Dependencies are inferred from the claim text.