Process for preparing poly(p-methylstyrene)

Abstract From the Canadian patent

Poly(methylstyrene) suitable for injection molding has a molecular weight distribution of at least 4.0 a melt index of at, least 5 and comprises the polymerization product of methylstyrene isomers in the following proportions:, p-methylstyrene at least 90 weight percent; m-methylstyrene 0 to 10 weight percent; o-methylstyrene less than 0.1 weight percent. The product is prepared by mixing substantially all of the methylstyrene isomer mixture to be polymerized with polymerization initiators including a high temperature initiator and a low temperature initiator and reacting the mixture at a temperature sufficient to effect the required polymerization.