Abstract: The invention relates to linear, thermotropic crosslinkable polymers, which comprises (A) polycondensing a complex dicarboxylic dichloride having the formula ##STR1## wherein Ar.sub.1 is ##STR2## Ar.sub.2 is ##STR3## Y is H, F, Cl, CN, phenyl, C.sub.n H.sub.2n+1, or OC.sub.n H.sub.2n+1, q is a cardinal number between 1 and 2, andn is a cardinal number between 1 and 4;provided that when X.sub.1 =OCO, then X.sub.2 =COO, when X.sub.1 =COO, then X.sub.2 =OCO, when X.sub.1 =NHCO then X.sub.2 =COHN, and when X.sub.1 =CONH then X.sub.2 =NHCO;(B) with an unsaturated dihydroxy oligomeric compound of the formula (III) ##STR4## present as an oligomer, where R.sup.1 is a linear, aliphatic, saturated, C.sub.2-12 moiety, or a C.sub.4-10 oxyaliphatic moiety;R.sup.2 is H or CH.sub.3 moiety; andm is a cardinal number between 1 and 4; at a mole ratio of from about 1:5 to about 5:1, at a temperature of from about 140.degree. C. to about 240.degree. C., for a time period from about 0.