Injection molding process using warp-free pigment compositions comprising diaryldiketopyrrolo-3,4-cpyrroles to improve dimensional stability

摘要

An injection-molding process using warp-free pigment compositions including diaryldiketopyrrolo3,4-Cpyrroles to improve the dimensional stability of the injection molded product by decreasing warping wherein the constituents of the formulation being injection molded are added into an injection molding machine in ready-premixed form or simultaneously as individual components. Preferred pigments are quinacridone pigments, disazo condensation pigments, isoindolinone pigments and pyrrolo3,4-Cpyrrole pigments with pyrrolo3,4-Cpyrrole pigments being especially preferred.