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: 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: 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 propylene-based polymer having a melt flow rate of 0.1 to 20 g/10 min. and a melting point Tm (° C.) measured by using a differential scanning calorimeter (DSC) of 147 to 159° C., in which the half width HW (° C.) of the melting peak measured by using a differential scanning calorimeter (DSC) and the melting point Tm (° C.) satisfy the relation: HW≦(188−Tm)/5.

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 propylene-based polymer having a melt flow rate of 0.1 to 20 g/10 min. and a melting point Tm (° C.) measured by using a differential scanning calorimeter (DSC) of 147 to 159° C., in which the half width HW (° C.) of the melting peak measured by using a differential scanning calorimeter (DSC) and the melting point Tm (° C.) satisfy the relation: HW≦(188−Tm)/5.

Abstract: A polypropylene resin composition comprising:

Abstract: A polypropylene resin composition comprising:

Abstract: A thermoplastic resin composition superior in impact resistance, heat resistance, flexural rigidity, processability and solvent resistance which comprises: (A) 100 parts by weight of a resin composition comprising 5-95% by weight of a polyphenylene ether, or a polyphenylene ether and polystyrene, and 95-5% by weight of a polyamide resin; (B) 5-50 parts by weight of a modified saturated rubber obtained by grafting 5-100 parts by weight of an aromatic vinyl compound on 100 parts by weight of a saturated type rubber and allowing 0.05-10 parts by weight of a compatibilizing agent to react with said rubber; and (c) 0.05-20 parts by weight of a compatibilizing agent.

Abstract: A rubber composition for tire treads comprising a rubber component consisting essentially of (A) 20 to 100% by weight of a solution-polymerized styrene-butadiene copolymer rubber having a Mooney viscosity ML.sub.1+4 of 30 to 200 at 100.degree. C. prepared by copolymerization of styrene, butadiene and a polyvinyl aromatic compound followed by coupling with a trifunctional or tetrafunctional coupling agent, and (B) 0 to 80% by weight of at least one rubber selected from the group consisting of an emulsion-polymerized styrene-butadiene rubber, a butadiene rubber, natural rubber and a synthetic polyisoprene rubber; and (C) 50 to 250 parts by weight of a carbon black having an iodine adsorption number of not less than 60 mg/g and an oil absorption of not less than 110 ml/100 g per 100 parts by weight of said rubber component; the tan .delta. peak temperature Tg of the cured product of said rubber composition being from -40.degree. to +5.degree. C.

Abstract: A vulcanizable rubber composition comprising an ethylene-.alpha.-olefin copolymer modified with an alkenyl aromatic compound alone or in combination with at least one other polymerizable compound, as a polymer component. The vulcanizable rubber composition is excellent in weather-resistance, ozone-resistance and heat-resistance and has a high strength, a high rigidity and a high hardness.

Abstract: An elastomeric butadiene copolymer prepared by a process which comprises copolymerizing butadiene, a polyvinyl aromatic compound and optionally styrene in a hydrocarbon solvent in the presence of an organolithium polymerization initiator and subjecting the resulting copolymer having lithium at the polymer end or ends to a coupling reaction with a trifunctional or tetrafunctional coupling agent, said butadiene copolymer satisfying the following conditions: (a) the content of styrene is at most 50% by weight, (b) the content of vinyl bonds in the butadiene portion is from 10 to 90% by weight, (c) the molecular weight distribution curve obtained by a high performance liquid chromatography has at least three peaks, and 5 to 60% by weight of all the polymer chains have a molecular weight which is at least 5 times the molecular weight in terms of standard polystyrene corresponding to the peak appearing on the lowest molecular weight side of the high performance liquid chromatogram, and (d) the Mooney viscosity (ML.

Abstract: Disclosed are thermoplastic resin compositions, comprising:(a) a polyphenylene ether resin or a resin composition containing a poplyphenylene ether,(b) a modified propylene polymer, or a propylene based resin composition containing the modified propylene polymer and/or a propylene polymer, and(c) optionally, a rubbery substance,wherein the proportion of the component (a) to the sum of the components (a) and (b) is 1 to 90% by weight, and that of the component (b) to the sum of the components (a) and (b) is 99 to 10% by weight, and when the component (c) is present, the proportion of the component (c) to the sum of the components (a) and (b) is 1 to 50 parts by weight per 100 parts by weight of (a) plus (b).

Abstract: An adhesive composition comprising a modified, ethylene/.alpha.-olefin copolymer rubber or a modified, ethylene/.alpha.-olefin/non-conjugated diene copolymer rubber containing 0.1-10% by weight of at least one member selected from the group consisting of an acid anhydride and a dicarboxylic acid, and, if necessary, as an amine compound,(i) 0.2-2 moles of a dialkylamine per mole of the acid anhydride in said modified copolymer rubber when said modified copolymer rubber contains no dicarboxylic acid;(ii) 0.2-2 moles of a polyamine compound per mole of the total amount of the acid anhydride and the dicarboxylic acid in said modified copolymer rubber; or(iii) 0.2-2 moles of a dialkylamine per mole of the acid anhydride in said modified copolymer rubber and 0.2-2 moles of a polyamine compound per mole of the acid anhydride in said modified copolymer rubber when said modified copolymer rubber contains no dicarboxylic acid.

Abstract: A modified polymer rubber is obtained by(1) graft-polymerizing at least one grafting monomer to a shreaded rubbery polymer (A) in an aqueous suspension at a temperature of 30.degree.-130.degree. C. to obtain a graft polymer, and(2) kneading the graft polymer with at least one polymerizable monomer in the presence of a free radical initiator at a temperature of 180.degree.-280.degree. C. This process does not cause gel formation and is advantageous in manufacturing cost.The modified polymer rubber thus obtained is excellent in processability and storage stability, and highly useful as a compatibilizer for various resins.

Abstract: A thermoplastic resin composition is disclosed which comprises(a) a modified polyphenylene ether or a composition containing it, and(b) (i) a modified propylene polymer comprising propylene polymer which is graft-copolymerized with a styrene based monomer or with a mixture of a styrene based monomer and a monomer copolymerizable therewith, or (ii) a composition containing the modified propylene polymer in (b)-(i) and propylene polymer. The resin composition may contain (c) a rubber-like substance containing at least one rubber-like substance having a polar group and/or (d) a melt flow characteristics improving agent.

Abstract: Disclosed are thermoplastic resin compositions, comprising:(a) a polyphenylene ether resin or a resin composition containing a polyphenylene ether,(b) a modified propylene polymer, or a propylene based resin composition containing the modified propylene polymer and/or a propylene polymer, and(c) optionally, a rubbery substance, wherein the proportion of the component (a) to the sum of the components (a) and (b) is 1 to 90% by weight, and that of the component (b) to the sum of the components (a) and (b) is 99 to 10% by weight, and when the component (c) is present, the proportion of the component (c) to the sum of the components (a) and (b) is 1 to 50 parts by weight per 100 parts by weight of (a) plus (b).

Abstract: The polypropylene composition of the present invention comprises:a blend of a resin composition composed of a specific polypropylene type resin (C) and at least one saturated polyester resin(D),an epoxy group containing copolymer (e) andat least one rubber selected from the group consisting of an ethylenic copolymer rubber (F), a modified ethylenic copolymer rubber (G) obtained by graft copolymerizing an unsaturated carboxylic acid or a derivative thereof onto an ethylenic copolymer rubber and a modified ethylenic copolymer rubber (H) obtained by graft copolymerizing an unsaturated carboxylic acid or derivative thereof and an unsaturated aromatic monomer onto an ethylenic copolymer rubber, and a basic compound (I) optionally added as a reaction accelerator.