Process of making carbon-filled polyamide

Claim 1

A PROCESS WHICH COMPRISES HEATING TO A TEMPERATURE 11 ATO 30*C. ABOUT THE BOILING POINT OF WATER UNDER AN AUTOGENOUS PRESSURE OF 180 TO 325 P.S.I.G. A MIXTURE CONSISTING ESSENTIALLY OF WATER AND A PARTIALLY POLYMERIZED POLYCARBONAMIDE OF THE CLASS OBTAINABLE BY HEATING DIBASIC ACID-DIAMINE MIXTURES AND MIXTURES THEREOF WITH MONOAMINOMONOCARBOXYLIC ACIDS, AND IN WHICH THE CARBONAMIDE GROUPS ARE SEPARATED BY A CHAIN OF 2 TO 10 CARBON ATOMS; ADDING TO THE RESULTANT FLUID MASS A DISPERSION CONTAINING 0.5 TO 5 WEIGHT PERCENT CARBON BASED ON SAID POLYCARBONAMIDE AND CONSISTING ESSENTIALLY OF 5 TO 20 WEIGHT PERCENT DECRETE CARBON PARTICLES SMALLER THAN 200 MILLIMICRONS AND OF 8 TO 35 MILLIMICRONS AVERAGE ULTIMATE PARTICLE SIZE, AND WATER CONTAINING AT LEAST 5 WEIGHT PERCENT, BASED ON SAID CARBONN, OF A DISPERSING AGENT SELECTED FROM THE ALKALI METAL SALTS OF ARYL SULFONIC ACID/FORMALDEHYDE CONDENSATION PRODUCTS AND THE ALKALI METAL SALTS OF LINGIN SULFONIC ACID; EVAPORATING, AND REMOVING FROM THE RESULTING MIXTURE UNDER AN AUTOGENES PRESSURE OF 180 TO 325 P.S.I.G., ANAMOUNAT OF WATER EQUAL TO THAT ADDED WITH SAID DISPERSION, AT A RATE WHICH OVER THE PERIOD FROM COMMENCING SAID ADDITION TO COMPLETING SAID REMOVAL AVERAGES 0.0038 TO 0.01 POUNDS PER MINUTE PER POUND OF SAID POLYCARBONAMIDE; THE AFORESAID ADDITION BEING COMPLETED IN SUBSTANTIALLY LESS TIME THAN THAT REQUIRED TO EVAPORATE THE ADDED WATER; AND FURTHER HEATING SAID MASS WITH REMOVAL OF WATER UNTIL SAID POLYCARBONAMIDE ATTAINS AN INHERENT VISCOSITY OF 0.4 TO 1.2.