Molding compounds and method of making same

Details Molding compounds and method of making same Molding compounds and method of making same

C - Chemistry, Metallurgy

08

L

400/5756

C08L 67/06 (2006.01)

Patent

CA 1045740

ABSTRACT OF THE DISCLOSURE An improved method of producing a molding compo- sition comprising a polyester resin prepolymer, a generally immiscible thermoplastic resin and a mutual monomeric solvent for both resins which will crosslink the polyester. The improvement is had by mixing thermoplastic polymer while still dispersed in the monomer from which it was polymerized with the thermosetting prepolymer. During crosslinking of the thermosetting prepolymer the immiscible thermoplastic resin separates out in major separated phase bodies having but a small amount of a secondary separated phase therein. A sizable percentage of major separated phase bodies have voids therein believed to be produced by vaporized pockets of unreacted monomer, and the major separated phase bodies have a more diffused interface with the matrix than the prior art materials. The diffused interface is believed produced at least in part by reason of the improved affinity which the thermoplastic molecules have for the polyester. The thermoplastic molecules are of a narrow band of intermediate molecular weight so that they all leave the polyester at about the same time and carry a sizable amount of monomer with them into the separated phase

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