Method of producing a butadieneacrylonitrile copolymer latex of high solids content

Claim 1

AN IMPROVED PROCESS FOR PRODUCING LATEX OF HIGH SOLIDS CONTENT DIRECTLY BY EMULSION POLYMERIZATION OF A CONJUGATED DIOLEFIN AND ACRYLONITRILE WHICH COMPRISES ADMIXING 65 TO 85 PARTS OF THE DIOLEFIN WITH 35 TO 15 PARTS OF ACRYLONITRILE AND 60 TO 75 PARTS OF WATER, EMULSIFYING THESE INGREDIENTS WITH 0.3 TO 1.0 PART OF AN EMULSIFIER CAPABLE OF INDUCING POLYMERIZATION AND SELECTED FROM THE GROUP CONSISTING OF POTASSIUM SOAPS OF FATTY ACIDS HAVING 10 TO 18 CARBON ATOMS PER MOLECULE AND ALKALI ALKYL SULFATES HAVING 10 TO 16 CARBON ATOMS PER ALKYL GROUP, EFFECTING THE POLYMERIZATION AT A TEMPERATURE BELOW 50* C. WHILE AGITATING THE RESULTING EMULSION AT A PERIPHERAL AGITATION SPEED BETWEEN 600 AND 900 FEET PER MINUTE IN THE CONJOINT PRESENCE OF 0.2 TO 0.3 PART OF AN ALKALI PERSULFATE CATALYST, OF 0.2 TO 0.75 PART OF AN ELECTROLYTE SELECTED FROM THE GROUP CONSISTING OF SODIUM AND AMMONIUM SALTS OF HYDROCHLORIC, PHOSPHORIC, SULFURIC, SULFUROUS, ACETIC, AND PYROPHOSPHORIC ACIDS TO CAUSE PARTICLE SIZE GROWTH AND 1.0 TO 2.0 PARTS OF A DISPERSER SELECTED FROM THE GROUP CONSISTING OF THE FIXED ALKALI SALTS OF A FORMALDEHYDE CONDENSED BETA NAPHTHYLENE SULFONIC ACID AND A FIXED ALKALI SALT OF A FATTY ACID HAVING NOT LESS THAN 8 AND NOT MORE THAN 9 CARBON ATOMS TO PREVENT COAGULATION, STOPPING POLYMERIZATION AFTER AT LEAST 70% CONVERSION AND STRIPPING OFF THE UNCONVERTED MONOMERS.