Method for producing dry ground calcium carbonate for use in thermoset polyester resin systems

摘要

A dry ground calcium carbonate filler or additive made by dry grinding calcium carbonate in the presence of an organo-amine and then surface treating the ground calcium carbonate with a dispersant and the method of making the same is disclosed. Dry ground calcium carbonate filler or additive made by dry grinding calcium carbonate in the presence of an organo-amine such as triethanolamine and then surface treating the ground calcium carbonate with a dispersant such as sodium polyacrylate when added to a polyester polymer composition yields a lower viscosity of the polymer system than without the addition of triethanolamine followed by surface treating the ground calcium carbonate with a dispersant.

主权项

1. A polymeric composition comprising:
a thermosetting polyester component, and a dry ground calcium carbonate made by dry grinding calcium carbonate in the presence of an organo-amine and then surface treating the ground calcium carbonate with a dispersant polymer, wherein the dispersant is a polymer having a molecular weight range of between one thousand to twenty thousand atomic mass units, wherein the dispersant polymer is selected from the group consisting of acrylic based homopolymers, acrylic based polymers, polyacrylamides, polyphosphates, and polyphosphonates, in the form of a hompolymer, copolymer, an acid, ester, or salt thereof, and combinations thereof, and is present in an amount of 0.01 to 0.5 weight percent of the ground calcium carbonate; and wherein the organo-amine is a primary, secondary or tertiary methanolamine, ethanolamine, propanolamine or butanolamine, or any combination thereof, and is present in an amount of 0.01 to 2.0 weight percent of the ground calcium carbonate.