Fusible but insoluble high-melting, fiber-forming polyesters

Claim 1

A PROCESS FOR PREPARING A HIGHLY POLYMERIC, CROSSLINKED, FIBER-FORMING POLYESTER COMPRISING (A) INCORPORATING AN ORGANIC PEROXY COMPOUND IN AN AMOUNT OF FROM ABOUT 1% TO ABOUT 15% BY WEIGHT OF THE POLYESTER INTO A SUBSTANTIALLY LINEAR POLYESTER OF REACTION CONSISTING OF (1) A DICARBOXYLIC ACID COMPOSED OF 30 TO 100 MOLE PERCENT OF A HEXACARBOXYLIC DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF TEREPHTHALIC ACID, 4,4''-SULFONYLDIBENZOIC ACID, 1,4-CYCLOHEXANEDICARBOXYLIC ACID, 1,2-DI(P-CARBOXYPHENOXY)ETHANE, 1,2-DI(P-CARBOXYPHENYL)ETHANE, AND P,P''-DIPHENIC ACID AND FROM 0 TO 70 MOLE PERCENT OF A DICARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF ISOPHTHALIC ACID, P-CARBOXYCARBANILIC ACID AND A SATURATED ALIPHATIC DICARBOXYLIC ACID CONTAINING FROM 2 TO 20 CARBON ATOMS AND (II) A DIHYDROXY COMPOUND COMPOSED OF FROM 10 TO 100 MOLE PERCENT OF AN ALIPHATIC NONCONJUGATED UNSATURATED GLYCOL CONTAINING AN ETHYLENICALLY UNSATURATED BOND IN THE GROUP OF INTERCONNECTED CABON ATOMS ATTACHED TO A GLYCOLIC OXY ATOM AND FROM 0 TO 90 MOLE PERCENT OF A SATURATED ALIPHATIC GLYCOL CONTAINING FROM 2 TO 12 CARBON ATOMS, AND (B) HEATING AT FROM ABOUT 50*C. UP TO THE MELTING POINT OF THE SUBSTANTIALLY LINEAR POLYESTER WHEREBY THERE IS PRODUCED A CROSS-LINKED POLYESTER WHICH IS SUBSTANTIALLY INSOLUBLE IN ORGANIC SOLVENTS, POSSESSES IMPROVED RESISTANCE TO HEAT DISTORTION AND IS FUSIBLE AT TEMPERATURES WITHIN THE RANGE BETWEEN ABOUT 150*C. AND 300*C.