Abstract: A resin composition for an automobile bumper comprising components (A), (B), and (C) described below:(A) 45 to 74% by weight of a crystalline ethylene-propylene block copolymer having (a) a flexural modulus of 15,000 kg/cm.sup.2 or more, (b) an ethylene content of 5 to 20% by weight, (c) an intrinsic viscosity (decalin, 135.degree. C.) of a portion soluble in p-xylene at room temperature of 3 or more, (d) a melt flow index (MI) of 21 to 70 g/10 min., and (e) a content of a portion insoluble in boiling n-heptane of 97% by weight or more;(B) 21 to 35% by weight of elastomer selected from the group consisting of components (I), (II) and (III) and having a weight ratio of (I) : [(I)+(II)+(III)] of from 0.5 to 1.0, (a) said component (1) being an amorphous ethylene-butene copolymer having a butene content of 10 to 25% by weight and a Mooney viscosity value, (ML.sub.1+4, 100.degree. C.

Abstract: A polypropylene resin composition comprising:(A) 45 to 70% by weight of an ethylene-propylene block copolymer synthesized under the process comprising the steps of;(a) polymerizing propylene with a Ziegler-Natta catalyst to obtain a highly crystalline polypropylene that contain not less than 97% by weight of a fraction insoluble in boiling n-heptane, and(b) copolymerizing ethylene with the polypropylene (a), and which(a) contains 0.5 to 10% by weight of ethylene,(b) contains 5 to 20% by weight of a fraction being soluble in p-xylene at room temperature and having an intrinsic viscosity value of not less than 2 (measured in decalin at 135.degree. C.),(c) has a melt-flow index value of 30 to 100 g/10 min., and,(d) has a value of flexural modulus of not less than 18,000 kg/cm.sup.2,(B) 10 to 20% by weight of an amorphous ethylene-propylene copolymer having(a) an ethylene content of 70 to 90% by weight,(b) a Mooney viscosity value (ML.sub.1+4 at 100.degree. C.) of 5 to 70,(C) 5 to 15% by weight of an ethylene-.

Abstract: A reinforced polypropylene resin composition comprising the following components (a) to (e), the total amount of the components (b) and (c) being 2 to 14%:(a) 45 to 75% by weight of a polypropylene modified with an organosilane compound or an unsaturated acid, or a modified polypropylene containing an unmodified polypropylene;(b) 1 to 10% by weight of a noncrystalline ethylene-.alpha.-olefin copolymer;(c) 1 to 10% by weight of a styrenic hydrogenated block copolymer;(d) 2 to 12% by weight of a glass fiber having a mean fiber diameter of 4 to 15 .mu.m; and(e) 15 to 35% by weight of a hard mica having a tensile strength of 30 kg/mm.sup.2 or more, a mean particle diameter of 50 to 250 .mu.m and an aspect ratio of 15 to 80.

Abstract: The polypropylene resin composition of the present invention comprises specific proportions of a crystalline ethylene-propylene block copolymer, an hydrogenated block copolymer, an amorphous ethylene-propylene copolymer, surface-treated talc, fibrous magnesium oxysulfate of granular form and a metal soap. This resin composition is well balanced in rigidity and impact resistance, has good mar resistance, and can be preferably used in large-sized parts for automobiles, particularly instrument panels for automobiles.

Abstract: A fibrous magnesium oxysulfate of granular form according to the present invention has an apparent specific gravity of 0.13-0.25, an oil absorption of 250-600 ml/100 g, a fiber diameter of 0.1-2.0 .mu.m and a fiber length of 10-100 .mu.m. The thermoplastic resin composition obtained by incorporating the magnesium oxysulfate into a thermoplastic resin has good properties and good appearance.

Abstract: The present invention relates to a polypropylene composition comprising a crystalline ethylene-propylene block copolymer having an ethylene content of 5-20% by weight and a melt flow index of 11-90, a thermoplastic elastomer, an amorphous propylene-.alpha.-olefin random copolymer having a number-average molecular weight of 1,000-20,000 and a propylene content of 40-95% by weight and an inorganic filler. This composition can be made into a molded article having no flow mark on the surface. The molded article is superior in rigidity, heat deformation resistance, low temperature impact resistance and coatability, has appearance free from waviness, voids, etc., and is suitable for use particularly in high quality bumper for automobiles.

Abstract: A polypropylene resin composition obtained by mixing a crystalline ethylene-propylene block copolymer, an amorphous ethylene-propylene copolymer, talc and fibrous magnesium oxysulfate and then, at the time of melt-kneading the mixture, adding a metal soap to the mixture, retains the fiber length of the fibrous magnesium oxysulfate and has high rigidity with the addition of a small amount of the metal soap.

Abstract: A fiber-reinforced thermoplastic resin composition comprises a composition of a thermoplastic resin in an amount of 50 to 99% by weight and a fibrous magnesium oxysulfate in an amount of 1 to 50% by weight, and magnesium oxide and/or zinc oxide in an amount of 0.01 to 30 parts by weight per 100 parts by weight of the fibrous magnesium oxysulfate.

Abstract: A fibrous magnesium oxysulfate of granular form according to the present invention has an apparent specific gravity of 0.13-0.25, an oil absorption of 260-600 ml/100 g, a fiber diameter of 0.1-2.0 .mu.m and a fiber length of 10-100 .mu.m. The thermoplastic resin composition obtained by incorporating the magnesium oxysulfate into a thermoplastic resin has good properties and good appearance.

Abstract: A fibrous magnesium oxysulfate of granular form according to the present invention has an apparent specific gravity of 0.13-0.25, an oil absorption of 250-600 ml/100 g, a fiber diameter of 0.1-2.0 .mu.m and a fiber length of 10-100 .mu.m. The thermoplastic resin composition obtained by incorporating the magnesium oxysulfate into a thermoplastic resin has good properties and good appearance.

Abstract: The polypropylene resin composition of the present invention can be obtained by melt mixing:(a) a modified polypropylene obtained by grafting a crystalline propylene-ethylene block copolymer with an unsaturated carboxylic acid, or a crystalline polypropylene containing the modified polypropylene,(b) a polyamide, and(c) a modified ethylene-.alpha.-olefin copolymer rubber obtained by grafting an ethylene-.alpha.olefin copolymer rubber with an unsaturated carboxylic acid. This composition is superior in low temperature impact resistance, rigidity, heat resistance and oil resistance.

Abstract: The present invention relates to a reinforced polypropylene composition comprising a polypropylene component (a modified polypropylene or a mixture of said modified polypropylene and an unmodified polypropylene), an ethylene-propylene copolymer, a glass fiber and mica having an average particle diameter of 40-160 .mu.m and an average aspect ratio of 30-85. This composition can provide molded articles of very low warpage and is useful for the production of molded articles, particularly core materials of instrument panels for automobiles requiring high rigidity, high heat resistance and deformation resistance.