Fiber-forming condensation polyesters having enhanced resistance to photodegradation

Claim 1

IN THE CONDENSATION POLYMERIZATION OF BIFUNCTIONAL ESTER-FORMING MONOMERS WHICH ARE FREE FROM ETHYLENIC UNSATURATION TO PREPARE A SYNTHETIC LINEAR FIBER-FORMING POLYESTER, THE METHOD OF PROVIDING ENHANCED RESISTANCE TO PHOTODEGRATION WHICH COMPRISES REACTING AND POLYCONDENSING SAID MONOMERS WITH 0.1 TO 10 MOL PERCENT, BASED ON THE NUMBER OF ESTER LINKAGES PRESENT IN THE FIBERFORMING POLYESTER, OF AN ESTER-FORMING COMPOUND WHICH EXHIBITS A STRONG ABSORPTION OF ELECTROMAGNETIC RADIATION HAVING A WAVE-LENGTH IN THE RANGE OF 290 TO 390 MILLIMICRONS AND NO SIGNIFICANT ABSORPTION OF RADIATIONS IN THE RANGE OF 400 TO 800 MILLIMICRONS, SAID ESTER-FORMING COMPOUND BEING FREE FROM ETHYLENIC UNSATURATION AND SELECTED FROM THE CLASS CONSISTING OF 2,2'',4- AND 2,4,4''TRIHYDROXYBENZOPHENONES HAVING SAID THREE HYDROXY GROUPS AS THE ONLY ESTER-FORMING GROUPS, 2-(DICARBOXYBENZAMIDOPHENYL)-2,1,3-BENZOTRIAZOLES, 2 - (DIHYDROXYBENZAMIDOPHENYL)-2,1,3-BENZOTRIAZOLES, 2 - (DICARBOXYBENZSULFONAMIDOPHENYL)-2,1,3-BENZOTRIAZOLES, - 2 (DIHYDROXYBENZSULFONAMIDOPHENYL)-2,1,3-BENZOTRIAZOLES, 2(2HYDROXYPHENYL)-NAPHTO(I83-D)TRIAZOLE-5,8 - DICARBOXYLIC ACID, 2(2-MERCAPTOPHENYL)-NAPHTHO(2,3-D)-TRIAZOLE-5,8-DICARBOXYLIC ACID, AND 2(2-AMINOPHENYL)-NAPHTOH(2,3-D) TRIAZOLE-5,8-DICARBOXYLIC ACID.