Abstract: Disclosed is a biaxially oriented multilayer polypropylene film which has a substrate layer containing a polypropylene resin composition including 97 to 99.97% by weight of a propylene polymer (A) and 0.03 to 3% by weight of a surfactant and also has, on at least one side of this layer, a layer containing a polypropylene resin composition including 30 to 80% by weight of a propylene polymer (C) having a melting point of 150 to 170° C. and 20 to 70% by weight of a propylene-based random copolymer (D) having a melting point of 120 to 149° C. and including 1 to 14 mole % of ethylene and/or ?-olefin.

Abstract: A polypropylene composition including 0.1 to 15% by weight of (A1) a propylene homopolymer and 85 to 99.9% by weight of (B1) a copolymer of propylene and an ?-olefin having at least 4 carbon atoms in which component (B1) contains 0.1 to 5% by weight of ?-olefin, or a polypropylene composition comprising 0.1 to 15% by weight of (A2) a copolymer of propylene and an ?-olefin having at least 4 carbon atoms and 85 to 99.9% by weight of (B2) a copolymer of propylene and an ?-olefin having at least 4 carbon atoms in which component (A2) contains 0.1 to 5% by weight of the ?-olefin, component (B2) contains 0.2 to 5% by weight of ?-olefin, and the content of the ?-olefin in component (B2) is larger than the content of the ?-olefin in component (A2).

Abstract: Disclosed is a biaxially oriented multilayer polypropylene film which has a substrate layer containing a polypropylene resin composition including 97 to 99.97% by weight of a propylene polymer (A) and 0.03 to 3% by weight of a surfactant and also has, on at least one side of this layer, a layer containing a polypropylene resin composition including 30 to 80% by weight of a propylene polymer (C) having a melting point of 150 to 170° C. and 20 to 70% by weight of a propylene-based random copolymer (D) having a melting point of 120 to 149° C. and including 1 to 14 mole % of ethylene and/or ?-olefin.

Abstract: Disclosed is a biaxially oriented film made of a thermoplastic material containing a polypropylene satisfying the following requirements (1), (2) and (3): (1) the polypropylene has a melting point from 150° C. to 165° C., (2) the 20° C. xylene-soluble fraction content in the polypropylene is from 0.1% by weight to 2% by weight, (3) the polypropylene has a melt flow rate from 0.1 g/10 min. to 10 g/10 min., wherein the film satisfies the following formula (I): Y??850×S+7000??(I) wherein S represents the thermal shrinkage of the film in the MD at 130° C. and Y represents the Young's modulus of the film in the TD, and wherein the thermal shrinkage of the film in the MD at 120° C. is 3% or less.

Abstract: Disclosed is a resin composition comprising from 20 to 99 parts by weight of a propylene-based polymer A having an MFRA of from 0.3 to 20 g/10 min and a melting point TmA of from 125 to 140° C. and from 1 to 80 parts by weight of a propylene-based polymer B having an MFRB of from 21 to 200 g/10 min and a melting point TmB of from 135 to 170° C., wherein a ratio TmA/TmB is less than 1, wherein a ratio MFRA/MFRB is 0.01<MFRA/MFRB<1 and wherein the resin composition has an MFR of from 0.3 to 20 g/10 min and a melting point of from 130 to 145° C. A heat-shrinkable film obtained by stretching the composition at least uniaxially is also disclosed which is superior in rigidity, heat shrinkage, weld-cut sealability and stretch processability. Incorporation of a nucleating agent improves the transparency of the film.

Abstract: A polypropylene-based resin composition for stretched film, comprising 20 to 98 parts by weight of a propylene-based polymer(A) having an intrinsic viscosity [&eegr;]A of 1.8 to 8 dl/g and a melting temperature TmA of 140 to 165 ° C. and 2 to 80 parts by weight of a propylene-based polymer(B) having an intrinsic viscosity [&eegr;]B of 0.8 to 1.7 dl/g and a melting temperature TmB of 150 to 170° C., wherein the ratio of TmA to TmB is less than 1, the ratio of the intrinsic viscosity [&eegr;]A to the intrinsic viscosity [&eegr;]B is more than 1 and less than 10, and the melt flow rate of the polypropylene-based resin composition is from 0.1 to 20 g/10 min.

Abstract: Disclosed is a polypropylene resin composition containing from 20 to 99.99 parts by weight of a propylene-based polymer (A) having a die swell ratio of less than 1.7 and a melting point defined as a peak temperature of a peak with a maximum intensity in a melting curve measured by DSC of from 125 to 139° C., and from 0.01 to 80 parts by weight of a propylene-based polymer (B) having a die swell ratio of not less than 1.8. This resin composition is suitable as a raw material of a heat-shrinkable film superior in rigidity, heat shrinkage and weld-cut sealability. A heat-shrinkable film obtainable from the resin composition is also disclosed.

Abstract: Disclosed is a resin composition comprising from 20 to 99 parts by weight of a propylene-based polymer A having an MFRA of from 0.3 to 20 g/10 min and a melting point TmA of from 125 to 140° C. and from 1 to 80 parts by weight of a propylene-based polymer B having an MFRB of from 21 to 200 g/10 min and a melting point TmB of from 135 to 170° C., wherein a ratio TmA/TmB is less than 1, wherein a ratio MFRA/MFRB is 0.01<MFRA/MFRB<1 and wherein the resin composition has an MFR of from 0.3 to 20 g/10 min and a melting point of from 130 to 145° C. A heat-shrinkable film obtained by stretching the composition at least uniaxially is also disclosed which is superior in rigidity, heat shrinkage, weld-cut sealability and stretch processability. Incorporation of a nucleating agent improves the transparency of the film.

Abstract: A polypropylene resin composition having a melt flow rate of 0.5 to 20 g/10 min., comprising 20 to 98 parts by weight of a propylene-based polymer (A) having an intrinsic viscosity [&eegr;] measured in tetralin at 135° C. of 2.0 to 5 dl/g and a melting point Tm determined from the peak temperature of the melting curve measured by a differential scanning calorie meter of 140 to 162° C. and 2 to 80 parts by weight of a propylene-based polymer B having an intrinsic viscosity [&eegr;] measured in tetralin at 135° C. of 0.80 to 1.8 dl/g and a melting point Tm determined from the peak temperature of the melting curve measured by a differential scanning calorie meter of 160 to 166° C. and a process for producing the same.

Abstract: A polypropylene-based resin composition for stretched film, comprising 20 to 98 parts by weight of a propylene-based polymer(A) having an intrinsic viscosity [&eegr;]A of 1.8 to 8 dl/g and a melting temperature TmA of 140 to 165 ° C. and 2 to 80 parts by weight of a propylene-based polymer(B) having an intrinsic viscosity [&eegr;]B of 0.8 to 1.7 dl/g and a melting temperature TmB of 150 to 170° C., wherein the ratio of TmA to TmB is less than 1, the ratio of the intrinsic viscosity [&eegr;]A to the intrinsic viscosity [&eegr;]B is more than 1 and less than 10, and the melt flow rate of the polypropylene-based resin composition is from 0.1 to 20 g/10 min.

Abstract: A polypropylene-based resin composition for a stretched film, comprising 20 to 99.99% by weight of a propylene-based polymer(A) having a die swelling ratio of less than 1.7, and 0.01 to 80% by weight of apropylene-based polymer(B) having a die swelling ratio of 1.8 or more.

Abstract: A polypropylene resin composition having a melt flow rate of 0.5 to 20 g/10 min., comprising 20 to 98 parts by weight of a propylene-based polymer (A) having an intrinsic viscosity [&eegr;] measured in tetralin at 135° C. of 2.0 to 5 dl/g and a melting point Tm determined from the peak temperature of the melting curve measured by a differential scanning calorie meter of 140 to 162° C. and 2 to 80 parts by weight of a propylene-based polymer B having an intrinsic viscosity [&eegr;] measured in tetralin at 135° C. of 0.80 to 1.8 dl/g and a melting point Tm determined from the peak temperature of the melting curve measured by a differential scanning calorie meter of 160 to 166° C. and a process for producing the same.

Abstract: A process for producing an olefin polymer using a catalyst in which (A) is a solid catalyst component which includes magnesium, titanium, halogen and an electron donative compound as essential constituents; (B) is an organoaluminum component; and (C) is at least two electron donative compounds (&agr;) and (&bgr;), wherein the pentad stereoregularity of a xylene insoluble fraction of a homopolyproylene is 0<mmrr/mmmm≦0.0068 when electron donative compound (&agr;) is used in combination with (A) and (B), and the pentad stereoregularity of a xylene insoluble fraction homoproplyene of a is 0.0068<mmrr/mmmm ≦0.0320 when electron donative compound (&bgr;) is used in combination with (A) and (B). A polypropylene produced in the process can be used to obtain a biaxially oriented film. (A) and (B). A polypropylene produced in the process can be used to obtain a biaxially oriented film.

Abstract: A catalyst system for polymerizing olefins is obtainable from (A) a solid component containing (A) magnesium, titanium and halogen and an electron donative compound which is an ether or ester; (B) an organoaluminum compound, and (C) at least two electron donative compounds, including an (.alpha.) and (.beta.) compound, wherein the total amount (C) compounds is 0.01 to 1 mole per mole of (B).

Abstract: An .alpha.-olefin polymer well balanced between stiffness, stickiness, processability, etc., which intrinsic viscosity [.eta.] is in the range of from 0.5 to 10 and which 20.degree. C. xylene-soluble fraction (CXS) content (% by weight) and 105.degree. C. xylene-insoluble fraction (XIS) content (% by weight) satisfy a condition of XIS.ltoreq.70.00-3.64CXS, provided that CXS is not smaller than 0 and not greater than 15; a specified .alpha.-olefin polymerizing catalyst for producing the polymer; a process for producing the polymer using the specified .alpha.-olefin polymerizing catalyst; a polypropylene for use in the production of a biaxially oriented film excellent in stretchability and satisfying the conditions (1)-(3) mentioned below; and a biaxially oriented film excellent in stiffness and dimensional stability obtained by stretching the polypropylene:(1) the content of 20.degree. C. xylene-soluble fraction (CXS) is 3.5% by weight or less,(2) the content of 20.degree. C.

Abstract: A polypropylene laminated film containing a crystalline polypropylene layer and, laminated on at least one side of the layer of the crystalline polypropylene, a layer of a copolymer of propylene and at least one .alpha.-olefin of from 4 to 10 carbon atoms having a specific composition, melt flow rate and molecular weight distribution in which the .alpha.-olefin content in the cold xylene soluble portion of the random copolymer is less than 1.7 times the .alpha.-olefin content in the copolymer and the random copolymer satisfies the mathematical expression,B.ltoreq.1.05A-10,wherein A is a weight percentage of the content of said at least one .alpha.

Abstract: A polypropylene laminated film containing a crystalline polypropylene layer and, laminated on at least one side of the layer of the crystalline polypropylene, a layer of a copolymer of propylene and at least one .alpha.-olefin of from 4 to 10 carbon atoms having a specific composition, melt flow rate and molecular weight distribution in which the .alpha.-olefin content in the cold xylene soluble portion of the random copolymer is less than 1.7 times the .alpha.-olefin content in the copolymer and the random copolymer satisfies the mathematical expression,B.ltoreq.1.05A-10,wherein A is a weight percentage of the content of said at least one .alpha.

Abstract: A polypropylene composition which contains a polypropylene and one or more ingredients selected from an antistatic agent and a surface-treated or untreated fine powdery silica gives a propylene stretched film having a well-balanced transparency, slip property and blocking resistance.