Visibly distinctive melt spun pigmented yarn

Claim 1

REINFORCED RUBBER COMPRISING BLACK RUBBER STOCK, HAVING IMBEDDED THEREIN CONTINU0US MULTIFILAMENT YARN WHICH YARN IS CHARACTERIZED BY HAVING CHROMITICITY WITHIN AREA A OF THE I.C.I. SYSTEM DIAGRAM OF FIGURE 1, A LUMINOUS DIRECTIONAL REFLECTANCE BETWEEN 0.10 AND 0.45, SAID YARN BEING COMPOSED OF AT LEAST ONE SYNTHETIC FIBER-FORMING POLYMER OF THE GROUP CONSISTING OF POLYAMIDES AND POLYESTERS, SAID POLYMER HAVING UNIFORMLY INCORPORATED THROUGHOUT IN AMOUNT BETWEEN ABOUT 0.05% AND ABOUT 0.5% BY WEIGHT, 2,9-DIMETHYLQUINACRIDONE WITH AVERAGE PARTICLE DIAMETER NOT ABOVE 0.5 MICRON, SAID YARN BEING FURTHER CHARACTERIZED BY ITS HIGH TENSILE STRENGTH OF AT LEAST 5.5 GRAMS PER DENIER, TENSILE MODULUS OF AT LEAST 27 GRAMS PER DENIER, HIGH FLEXURAL FATIGUE LIFE OF AT LEAST 43 HOURS MEASURED BY THE ASTM-GOODYEAR TUBE TEST, AND UNIFORMITY OF THESE PHYSICAL PROPERTIES WITHIN $20% THROUGHOUT THE YARN LENGTH.