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Abstract

A process for preparing free flowing pellets of thermosetting resin. The process includes the steps of polymerizing in the presence of a polymerization solvent the A forming component of a peroxide curable, tacky, cold flowing block copolymer AB, to form an active block; end capping the active block with a polyisocyanate compound; forming a solution of a non-cold flowing rubber; charging the solution simultaneously with the addition of the B forming component of the block copolymer AB with heat to form a thermosetting resin; removing the polymerization solvent; forming pellets of the resin, free from cold flow; subjecting the pellets to a surface treatment whereby a coating is provided to remove tack; and thereafter separating the pellets to yield a free flowing thermosetting resin comprising from about 55 to 95 parts by weight of the tacky, cold flowing block copolymer and from about 5 to 45 parts by weight of the non-cold flowing rubber and which upon cure has a flexural modulus of from about 1.7 GPa to about 4.4 GPa. A similar process includes the step of adding a filler material prior to pelletization and produces free flowing thermosetting resin which upon cure has a flexural modulus of from about 3 GPa to about 10 GPa. Processes are also provided for preparing free flowing pellets of thermosetting resin based upon low molecular weight, high vinyl content conjugated diene homopolymers as the tacky, cold flowing polymer.

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