Abstract: Silicate filled polyolefin resin composites exhibit improved mechanical properties if the silicate filler and polyolefin resin are specially combined with additives comprising chlorinated aliphatic compounds. The composites are preferably made from blends comprising about 1-36 parts by weight silicate flakes or fibers, 9 parts by weight propylene resin and minor effective amounts of the additive. Various processing techniques such as selecting the time the blends reside at melt temperatures during compounding permits development of advantageous properties.

Abstract: Mica filled polyolefin resin composites exhibit improved mechanical properties if the mica filler and polyolefin resin are specially combined with additives comprising chlorinated aliphatic compounds. The composites are preferably made from blends comprising about 1-36 parts by weight mica flakes (especially phlogopite mica), 9 parts by weight propylene resin and minor effective amounts of the additive. Various processing techniques such as selecting the time the blends reside at melt temperatures during compounding permits development of advantageous properties.

Abstract: A method for increasing impact properties of calcium carbonate filled propylene resin composites, particularly impact properties at low temperatures, which comprises admixing critically sized particles of propylene homopolymer and copolymer resins and calcium carbonate filler to form uniform, preferably powdery, blends particularly suitable for such shaping operations as injection molding.