Thermoplastic high acrylonitrile resins

A thermoplastic, moldable, high acrylonitrile resin characterized by having a notched Izod impact resistance strength of about 1 to about 3.4 ft./lbs/inch and a heat distortion temperature of about 85.degree. C. to about 105.degree. C. prepared by the method which consists essentially of (I) preparing a suspension polymerization system by charging to a reactor as components, (A) about 90 to 100 parts by weight acrylonitrile, (B) about 0 to about 10 parts by weight styrene, (C) about 150 to about 300 parts by weight water, (D) about 2 to about 20 parts finely divided resin polymer particles having a particle size in the range of about 30 to about 300 U.S. Standard mesh to act as both (1) a polymeric suspending aid and nuclei for formation of high acrylonitrile resin during the subsequent polymerization in which a chemical interaction takes place which binds said suspending aid into the matrix of the high acrylonitrile polymer product and (2) a processing aid as a dispersion with the high acrylonitrile polymer product, (E) free radical initiator and, optionally, (F) minor amount of suspending agent, (II) free radical polymerizing said acrylonitrile, and styrene if used, onto said finely divided resin polymer particle suspending aid, where said resin polymer suspending aid is an acrylonitrile/butadiene/styrene resin and (III) recovering and drying the resultant resin product.