Styrene → Prop-2-enenitrile--ethenylbenzene (1/1)

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The butylacrylate rubber grafted with styrene and acrylonitrile (BA-g-SAN) was prepared by polymerizing butyl acrylate to form a polybutylacrylate rubber using conventional emulsion polymerization. The rubber was crosslinked during polymerization such that the swelling index of the rubber in methyl ethyl ketone at 25° C. was about 10. The rubber was grafted by polymerizing a 70/30 weight ratio of styrene and acrylonitrile (120 parts total) in the presence of 100 parts of the rubber. The resulting grafted rubber had a weight average particle size diameter (Dw) of about 0.2 microns with a range of from about 0.08 to about 0.4 microns. The grafted rubber contained about 45% by weight of butyl acrylate and about 55S by weight of styrene acrylonitrile copolymer (SAN) present as grafted polymer and as free ungrafted matrix copolymer formed during the graft polymerization procedure.

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