Patent ID: 6545090
Filing Date: 2003-04-08
Classification: C08F,C08L

Abstract:
A rubber modified monovinylidene aromatic polymer comprising:a) a monovinylidene aromatic polymer matrix, b) rubber particles dispersed therein, characterized in that the rubber particles are produced from a diene rubber having I) a high molecular weight component and II) a low molecular weight component; the high molecular weight component having a weight average molecular weight at least two and one half times greater than the weight average molecular weight of the low molecular weight component and the low molecular weight component constitutes from about 20 to about 80 weight percent of the total rubber content, wherein both components I and II have a 1,4 cis content of greater than 70 percent and III) the rubber is grafted using a graft promoting chemical initiator, with monovinylidene aromatic polymer to the extent that the amount of grafted rubber is at least 30 percent of the total rubber at phase inversion.