Abstract: A polypropylene resin composition comprises (A) (a-1) a specific crystalline propylene/ethylene block copolymer or (a-3) a polymer mixture comprising the (a-1) and (a-2) a specific crystalline propylene-homopolymer in specific ratio, in an amount of 5 to 56% by weight, (B) a hydroxyl group-containing polypropylene having an intrinsic viscosity [?] of 0.8 to 2.0 dl/g and a melting point of 150 to 168° C., in an amount of 10 to 45% by weight, (C) a copolymer rubber of ethylene and an ?-olefin having a melt flow rate (ASTM D-1238, 230° C., load of 2160 g) of 0.

Abstract: Disclosed is a propylene-based polymer including from 51 to 75% by weight of a propylene-ethylene random copolymer component (A) having an intrinsic viscosity [?]A, measured in tetralin at 135° C., of 5 dl/g or more and an ethylene content of not less than 8% by weight but less than 20% by weight, and from 25 to 49% by weight of a propylene-based polymer component (B) obtained by polymerizing monomers mainly including propylene, the component having an intrinsic viscosity [?]B, measured in tetralin at 135° C., of 1.2 dl/g or less, wherein said amounts of the components (A) and (B) are each based on the combined weight of these components.

Abstract: Disclosed is a propylene-ethylene block copolymer which is superior in stiffness, hardness and moldability and also in balance between toughness and low-temperature impact resistance. The copolymer contains from 60 to 85% by weight of a crystalline polypropylene portion and from 15 to 40% by weight of a specific propylene-ethylene random copolymer portion, wherein the propylene-ethylene block copolymer has a melt flow rate (MFR) of from 5 to 120 g/10 min.

Abstract: A polypropylene-based resin composition comprising 0.5 to 10% by weight of a propylene-based polymer component (A1) obtained by polymerizing a monomer mainly composed of propylene, having an intrinsic viscosity [&eegr;]A1 measured in tetralin at 135° C. of 5 dl/g or more and a melting peak temperature TmA1 measured by a differential scanning calorimeter of 130 to 160° C., 90 to 99.5% by weight of a propylene-based polymer component (A2) obtained by polymerizing a monomer mainly composed of propylene, intrinsic viscosity [&eegr;]2 measured in tetralin at 135° C. of less than 5 dl/g.

Abstract: A thermoplastic composition which is obtained by melt-kneading (1) 55 to 75 wt. % crystalline polypropylene resin together with (2) 10 to 30 wt. % elastomer comprising either a rubber containing a vinyl aromatic compound or a mixture thereof with an ethylene/&agr;-olefin random copolymer rubber and (3) 15 to 25 wt. % talc having an average particle diameter of 3 &mgr;m or smaller. The composition satisfies specific requirements with respect to: the long period obtained by X-ray small-angle scattering attributable to the vinyl aromatic-containing rubber in a blend obtained by melt-kneading the ingredients (1) and (2); the shape and diameter of the elastomer particles present near the polypropylene/elastomer interface in the blend; and the difference between the glass transition point of the ingredient (1) and that of the composition attributable to the crystalline polypropylene homopolymer parts.

Abstract: Disclosed is a propylene-ethylene block copolymer which is superior in stiffness, hardness and moldability and also in balance between toughness and low-temperature impact resistance. The copolymer contains from 60 to 85% by weight of a crystalline polypropylene portion and from 15 to 40% by weight of a specific propylene-ethylene random copolymer portion, wherein the propylene-ethylene block copolymer has a melt flow rate (MFR) of from 5 to 120 g/10 min.

Abstract: A polypropylene-based resin composition comprising 0.5 to 10% by weight of a propylene-based polymer component (A1) obtained by polymerizing a monomer mainly composed of propylene, having an intrinsic viscosity [&eegr;]A1 measured in. tetralin at 135° C. of 5 dl/g or more and a melting peak temperature TmA1 measured by a differential scanning calorimeter of 130 to 160° C., and 90 to 99.5% by weight of a propylene-based polymer component (A2) obtained by polymerizing a monomer mainly composed of propylene, having an intrinsic viscosity [&eegr;]A2 measured in tetralin at 135° C. of less than 5 dl/g.

Abstract: A polypropylene resin composition comprising: 95 to 80% by weight of a polypropylene resin (A) consisting of a propylene-ethylene block copolymer (i) composed of a propylene homopolymer portion having an intrinsic viscosity [&eegr;]AP of not more than 1.3 dl/g, and a propylene-ethylene random copolymer portion having an intrinsic viscosity [&eegr;]AEP of not more than 3.0 dl/g, or a mixture (ii) of the propylene-ethylene block copolymer (i) and a propylene homopolymer; and 5 to 20% by weight of a propylene-ethylene block copolymer (B) having a propylene-ethylene random copolymer portion having an intrinsic viscosity [&eegr;]BEP of from 8.0 to 15 dl/g, wherein the polypropylene resin composition has a melt flow rate (MFR) of from 5.0 to 150 g/10 min. and the sum of the (A) and (B) is 100% by weight.

Abstract: A polypropylene resin composition comprising: 95 to 50% by weight of a propylene homopolymer (A) having an intrinsic viscosity [&eegr;]A of not more than 1.3 dl/g; and 5 to 50% by weight of a propylene-ethylene block copolymer (B) having a propylene homopolymer portion having an intrinsic viscosity [&eegr;]BP of from 1.4 to 2.0 dl/g, and a propylene-ethylene random copolymer portion having an intrinsic viscosity [&eegr;]BEP of from 4.0 to 15 dl/g, the polypropylene resin composition having a melt flow rate of from 5.0 to 150 g/10 min.

Abstract: A polypropylene resin composition which comprises: (1) 55 to 75% by weight of (A) a polypropylene resin consisting of a mixture of the following polymers (i) and (ii): (i) a propylene-ethylene block copolymer having a propylene homopolymer part which is the first segment and having a propylene-ethylene random copolymer part which is the second segment and (ii) a propylene homopolymer having an intrinsic viscosity [&eegr;]P of 0.8 to 1.8 dl/g as measured in tetralin at 135° C., (2) 21 to 30% by weight of (B) an ethylene-1-octene copolymer rubber having a melt flow rate (JIS-K-6758 at 190° C.

Abstract: A polypropylene resin composition comprising:

Abstract: A polypropylene resin composition comprising:

Abstract: There is disclosed: an injection-molded product containing a propylene based resin composition having a melt viscosity of not more than about 32 Pa·s measured at a shear rate of 2,432 s−1 and at a temperature of 240° C. and a swelling ratio of from about 1.3 to 2.0 measured at a shear rate of 2,432 s−1 and at a temperature of 240° C., which composition comprises: (i) about 50 to 70% by weight of a propylene based resin; (ii) about 15 to 30% by weight of a thermoplastic elastomer; and (iii) about 10 to 30% by weight of an inorganic filler.

Abstract: A polypropylene resin composition, which exhibits an excellent coating adherence, high rigidity, high impact strength at low temperatures, prominent heat resistance and excellent appearance of moldings even without effecting a treatment with trichloroethane as a pretreatment step before coating, comprises 30 to 92% by weight crystalline ethylene propylene block copolymer (A), 5 to 30% by weight ethylene-.alpha. olefin copolymer rubber (B), 3 to 20% by weight ethylene-butene-1 copolymer (C) having the following characteristics:(C1) a density of 0.870 to 0.915 g/cm.sup.3,(C2) a melt index at 190.degree. C. of 5 to 30 g/10 minutes, and(C3) a melt peak at 100.degree. C. or higher as determined in the thermogram with increasing temperature by a Differential Scanning Calorimeter (DSC),and 0 to 20% by weight inorganic filler (D).

Abstract: A polypropylene resin composition, which exhibits an excellent coating adherence, high rigidity, high impact strength at low temperatures, prominent heat resistance and excellent appearance of moldings as required for coatings on the exterior parts of automobiles even without effecting a treatment with trichloroethane as pretreatment step before coating and without a primer as undercoating and which can be baked at a temperature of 130.degree. C. or higher, comprises 15 to 92% by weight crystalline ethylene propylene block copolymer, 5 to 40% by weight ethylene propylene copolymer rubber, 1 to 15% by weight polypropylene oligomer containing hydroxyl group, and 2 to 30% by weight inorganic filler.