Method of coating a flake of nylon with a pigment

Claim 1

IN THE PROCESS OF DISPERSING A POWDERY PIGMENT ON THE SURFACES OF A FLAKE OF NYLON HAVING AN INTRINSIC VISCOSITY OF ABOUT 0.7 TO 1.3 WHEREIN THE FLAKE OF NYLON IS TUMBLED WITH A POWDERY PIGMENT, THE IMPROVEMENT COMPRISING FLOWING A LIQUID NYLON POLYMER HAVING THE SAME RECURRING MOLECULAR UNITS OF WHICH THE SAID FLAKE IS COMPOSED BUT HAVING AN INTRINSIC VISCOSITY OF ABOUT 0.05 TO 0.2 INTO AN AQUEOUS MEDIUM WHEREIN THE NYLON POLYMER OF LOW INSTRINSIC VISCOSITY IS SOLIDIFIED IN THE FORM OF FINELY DIVIDED PARTICLES, INTIMATELY BLENDING THE THUSFORMED FINELY DIVIDED NYLON POLYMER WITH AN INSOLUBLE PIGMENT IN THE SAID AQUEOUS MEDIUM, AND IN THE PRESENCE OF A SURFACE-ACTIVE AGENT, SAID PIGMENT BEING PRESENT IN AN AMOUNT OF 10 TO 25 PERCENT BY WEIGHT BASED ON THE WEIGHT OF THE AQUEOUS MEDIUM AND IN AN AMOUNT OF 25 TO 75 PERCENT BY WEIGHT BASED ON THE WEIGHT OFG THE PIGMENT AND SAID NYLONE POLYMER OF LOW INTRINSIC VISCOSITY, SEPARATING AND DRYING THE RESULTING PIGMENT-NYLON BLEND, COMMINUTING THE RESULTING PIGMENT-NYLON BLEND TO A POWDER THAT PASSES A 20 MESH SCREEN AND THEREAFTER TUMBLING THE SAID POWDER WITH THE SAID NYLON FLAKE, WHEREBY THE SAID POWDER BECOMES UNIFORMLY DISPERSED ON THE SURFACES OF THE SAID NYLON FLAKE, SAID POWDER BEING EMPLOYED IN A PREDETERMINED QUANTITY SUCH THAT 0.01 TO 10.0 PERCENT BY WEIGHT OF PIGMENT BASED ON THE WEIGHT OF THE SAID NYLON FLAKE ADHERES THERETO.