Process for preparing high impact material by polymerizing styrene in the presence of diene rubber and polystyrene

Claim 1

A PROCESS OF PREPARING A HIGH IMPACT RESINOUS COMPOSITION OF POLYMERIZED VINYL AROMATIC COMPOUNDS IN WHICH THE MONOMERS UTILIZED IN THE RESINOUS COMPOSITION CONSIST ESSENTIALLY OF FROM ABOUT 2 TO ABOUT 20 PARTS BY WEIGHT OF A CONJUGATED DIENE AND FROM 80 TO 98 PARTS BY WEIGHT OF MONOVINYL AROMATIC COMPOUND, COMPRISING THE STEPS OF MIXING FROM ABOUT 2 TO 20 PARTS OF A RUBBER HAVING A CIS, 1,4 CONTENT ABOVE ABOUT 90% AND WHICH IS A POLYMER OF CONJUGATED DIENE WITH A CROSSLINKING AGENT AND ALSO WITH FROM ABOUT 1 TO ABOUT 30 PARTS BY WEIGHT OF THE MONOVINYL AROMATIC COMPOUND IN POLYMERIZED FORM, MILLING THE MIXTURE FOR A TIME AND TEMPERATURE SUFFICIENT TO DISPERSE AND CROSSLINK THE RUBBER, ADDING FROM ABOUT 50 TO ABOUT 97 PARTS BY WEIGHT OF MONOMERIC MONOVINYL AROMATIC COMPOUND TO THE MIXTURE, AGITATING THE MIXTURE TO FORM A SOLUTION OF POLYMER IN MONOMER, SAID SOLUTION CONTAINING DISPERSED RUBBER PARTICLES, AND SUBJECTING SAID SOLUTION TO POLYMERIZING CONDITIONS WHEREBY SUBSTANTIALLY ALL OF THE MONOMER IS POLYMERIZED.