Process of pigmenting polyamides

Claim 1

THE PROCESS OF PREPARING PIGMENTED SYNTHETIC LINEAR POLYAMIDES WHICH COMPRISES, HEATING A MIXTURE CONTAINING AN AQUEOUS DISSPERSION OF FINELY DIVIDED PIGMENT, A SYNTHETIC LINEAR POLYAMIDE, WATER AND AN ORGANIC LIQUID WHICH CONDITIONS SAID POLYAMIDE SO THAT IT BECOMES MOLTEN AT AN APPRECIABLE LOWER TEMPRATURE THAN WOUDL BE THE CASE IN THE ABSENCE OF SAID ORGANIC LIQUID AND IS CHEMICALLY INERT, TO SAID PLYAMIDE, SAID ORGANIC LIQUID BEING FROM THE GROUP CONSISTING OF MONOHYDRIC ALIPHATIC ALCOHOLS CONTAINING FROM 1 TO 6 CARBON ATOMS, ALICYCLIC ALCOHOLS, POLYHYDIRC ALCOHOLS, KETONES, AND MIXTURES THEREOF, TO A TEMPERATURE AT WHICH SAID POLYAMIDE IS MOLTEN BUT BELOW THE TEMPERATURE AT WHICH THE POLYAMIDE UNDERGOES SUBSTANTIAL DECOMPOSITION AND THUS EFFECTING THE SUBSTANTIALLY COMPLETE TRANSFER OF THE PIGMENT FROM THE AQUEOUS PHASE INTO THE MOLTEN POLYAMIDE PHASE, AGITATING AND COOLING THE MIXTURE TO EFFECT FROMATION OF SOLID PIGMENTED POLYAMIDE PARTICLES, AND SEPARATING THE SOLID PIGMENTED POLYAMIDE PARTICLES FROM THE LIQUID.