Phthalic anhydride derivatives
AssigneeThe Upjohn Company
InventorChung-Yuan Lin
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Abstract
Compounds are described which are characterized by the formula ##STR1## C.sub.n H.sub.2n =alkylene with 2 to 6 C atoms in the chain. R=inert substituent and m=0-3. The compounds contain an anhydride group and a hetero ring capable of opening to yield an isocyanate group on heating. Accordingly, they can undergo self-condensation on heating to yield polyamide-imides. The compounds can also be polymerized by heating in the presence of difunctional monomers such as diols, diamines, alkanolamines and the like.
Claims9
A compound having the formula ##STR13## wherein C.sub.n H.sub.2n represents alkylene containing from 2 to 6 carbon atoms in the chain separating the valencies, R is an inert substituent selected from the class consisting of lower-alkyl, lower-alkoxy, lower-alkenyl, lower-alkenyloxy, lower-alkylmercapto, cyano and trifluoromethyl, and m is an integer from 0 to 3.
Dependencies are inferred from the claim text.