Preparation of synthetic polymeric materials

Claim 1

THE METHOD WHICH COMPRISES PREPARING AN AQUEOUS DISPERSION COMPRISING DISPERSING SOLID PARTICLES BELOW 0.4 MICRON IN AVERAGE DIAMETER OF A SATURATED RESINOUS POLYMER OF MONOMERIC MATERIAL CONTAINING A SINGLE CARBON-TO-CARBON UNSATURATED LINKAGE WHICH IS AN OLEFINIC DOUBLE BOND AND IS CONNECTED TO A METHYLENE GROUP, ADDING TO SAID DISPERSION A MONOMERIC MIXTURE POLYMERIZABLE TO FORM A RUBBERY COPOLYMER AND CON TAINING FROM 50 TO 90% BY WEIGHT OF BUTADIENE1.3 AND THE REMAINDER OF ACRYLONITRILE, AND POLYMERIZING THE SAID MONOMERIC MIXTURE IN THE PRESENCE OF THE SAID PARTICLES OF SATURATED RESINOUS POLYMER WHEREBY FORMATION OF RUBBERY COPOLYOUS DISPERSION IN WHICH THE SATURATED RESINOUS MER OCCURS ON SAID PARTICLES TO PRODUCE AN AQUEPOLYMER AND THE RUBBERY COPOLYMER FORMED BY THE POLYMERIZATION ARE INTIMATELY COMBINED IN THE SAME INDIVIDUAL PARTICLES, THE SAID MONOMERIC MIXTURE BEING ADDED AND POLYMERIZED IN A PROPORTION SUFFICIENT TO FORM, TOGETHER WITH THE SAID RESINOUS POLYMER, A MIXED POLYMERIC PRODUCT WHICH WHEN SEPARATED FROM THE POLYMERIC PRODUCT SOFT RUBBERY MATERIAL VULCANIZABLE WITH SULFUR TO A TENSILE STRENGTH ABOVE 1,000 LBS./SQ.IN.