Patent ID: 6312639
Filing Date: 2001-11-06
Classification: B29C,C08J

Abstract:
In the method for compounding a functional additive for a thermoplastic resin into the said resin by blending the additive with the resin at a temperature above the melting point of the resin; the improvement enabling better dispersion of the additive in the resin, and/or better processing rheology; comprising:incorporating as a processing aid in combination with the additive and resin, from 0.05 to 2.0% by weight of said combination of processing aid, additive and resin of an amorphous particulate silicate which contains from about 2% to about 50% water and which intumesces and expands to at least twice its original volume upon being heated to a temperature range the lower threshold of which is between 250.degree. and 275.degree. F.; forming a melt mixture by blending and heating the mixture of resin, additive and processing aid to a temperature which is both above the intumescing temperature for said particulate silicate and above the melting point of the resin to form a melt mixture; and forming the melt mixture into a molded or extruded pellet or product.