Abstract: To provide an ultrahigh molecular weight polyethylene stretched microporous film having high strength and heat resistance. An ultrahigh molecular weight polyethylene stretched microporous film, which comprises at least an ultrahigh molecular weight polyethylene having an intrinsic viscosity ([?]) of at least 7 dl/g and at most 60 dl/g, and which has a porosity of at least 10% and at most 70% and a breaking stress of at least 1 MPa when melt-stretched at 150° C., which uses, as the ultrahigh molecular weight polyethylene, preferably ultrahigh molecular weight polyethylene particles which satisfy (1) an intrinsic viscosity ([?]) of at least 7 dl/g and at most 60 dl/g, (2) a bulk density of at least 130 kg/m3 and at most 700 kg/m3, and (3) ?Tm (?Tm=Tm1?Tm2) of at least 9° C. and at most 30° C., which is a difference between the melting point (Tm1) at the 1st scanning and the melting point (Tm2) at the 2nd scanning measured by DSC.

Abstract: To provide novel ultrahigh molecular weight polyethylene particles having a high melting point and exhibiting high crystallinity, thus capable of providing a molded product excellent in mechanical strength, thermal resistance and abrasion resistance. Ultrahigh molecular weight polyethylene particles which satisfy that (1) the intrinsic viscosity (?) is at least 15 dL/g and at most 60 dL/g, (2) the bulk density is at least 130 kg/m3 and at most 700 kg/m3, and (3) ?Tm (?Tm=Tm1?Tm2) i.e. the difference between a melting point (Tm1) in 1st scan and a melting point (Tm2) in 2nd scan, measured by a differential scanning calorimeter (DSC), is at least 11° C. and at most 30° C.

Abstract: To provide an ultrahigh molecular weight polyethylene stretched microporous film having high strength and heat resistance. An ultrahigh molecular weight polyethylene stretched microporous film, which comprises at least an ultrahigh molecular weight polyethylene having an intrinsic viscosity ([?]) of at least 7 dl/g and at most 60 dl/g, and which has a porosity of at least 10% and at most 70% and a breaking stress of at least 1 MPa when melt-stretched at 150° C., which uses, as the ultrahigh molecular weight polyethylene, preferably ultrahigh molecular weight polyethylene particles which satisfy (1) an intrinsic viscosity ([?]) of at least 7 dl/g and at most 60 dl/g, (2) a bulk density of at least 130 kg/m3 and at most 700 kg/m3, and (3) ?Tm (?Tm=Tm1?Tm2) of at least 9° C. and at most 30° C., which is a difference between the melting point (Tm1) at the 1st scanning and the melting point (Tm2) at the 2nd scanning measured by DSC.

Abstract: To provide novel ultrahigh molecular weight polyethylene particles having a high melting point and exhibiting high crystallinity, thus capable of providing a molded product excellent in mechanical strength, thermal resistance and abrasion resistance. Ultrahigh molecular weight polyethylene particles which satisfy that (1) the intrinsic viscosity (?) is at least 15 dL/g and at most 60 dL/g, (2) the bulk density is at least 130 kg/m3 and at most 700 kg/m3, and (3) ?Tm (?Tm=Tm1?Tm2) i.e. the difference between a melting point (Tm1) in 1st scan and a melting point (Tm2) in 2nd scan, measured by a differential scanning calorimeter (DSC), is at least 11° C. and at most 30° C.

Abstract: A propylene polymer resin composition comprising 50-99 wt. % of a propylene polymer resin and 1-50 wt. % of an ethylene polymer resin, wherein said ethylene polymer resin has the following characteristics (A) through (E): (A) a density (d), as measured by a density gradient tube method according to JIS K6760, of 940-960 kg/m3; (B) a melt flow rate (MFR), as measured at 190° C. under a load of 2.16 kg, of 1-10 g/10 min.; (C) a frequency of terminal vinyl of not more than 0.2 per 1,000 carbon atoms; (D) a melt strength (MS160), as measured at 160° C., of at least 100 mN; and (E) an activation energy of flow (Ea) of not larger than 35 kJ/mol. The propylene polymer resin has high melt strength and exhibits enhanced fluidity, processability and shapability.

Abstract: A resin composition for injection molding comprising (I) 70-90 wt. parts of a propylene polymer resin having a MFR of at least 30 g/10 min. but smaller than 200 g/10 min. as measured at 230° C. according to ASTM D-1238, (II) 5-25 wt. parts of an ethylene-?-olefin copolymer having a melt strength (MS160) of larger than 50 mN but not larger than 300 mN as measured at 160° C., and (III) 5-25 wt. parts of an olefin polymer resin having a density of at least 850 kg/m3 but not larger than 930 kg/m3 as measured according to JIS K6760, and a melt strength (MS160) of smaller than 30 mN as measured at 160° C., wherein the sum of (I), (II) and (III) is 100 wt. parts. This resin composition gives an injection molded article exhibiting enhanced impact strength at a low temperature and having no or minimized flow marks on the surface thereof.

Abstract: A propylene polymer resin composition comprising 50-99 wt. % of a propylene polymer resin and 1-50 wt. % of an ethylene polymer resin, wherein said ethylene polymer resin has the following characteristics (A) through (E): (A) a density (d), as measured by a density gradient tube method according to JIS K6760, of 940-960 kg/m3; (B) a melt flow rate (MFR), as measured at 190° C. under a load of 2.16 kg, of 1-10 g/10 min.; (C) a frequency of terminal vinyl of not more than 0.2 per 1,000 carbon atoms; (D) a melt strength (MS160), as measured at 160° C., of at least 100 mN; and (E) an activation energy of flow (Ea) of not larger than 35 kJ/mol. The propylene polymer resin has high melt strength and exhibits enhanced fluidity, processability and shapability.

Abstract: An object of the present invention relates to provide an ethylene polymer having excellent mechanical strength and excellent molding processability in a wide molding processing temperature range. The invention relates to use an ethylene polymer comprising a repeating unit derived from ethylene, or a repeating unit derived from ethylene and a repeating unit derived from a C3-8 ?-olefin, the ethylene polymer being satisfied with the following (A) to (F). (A) Density (d (kg/m3)) is from 910 to 970, (B) MFR (g/10 min)) is from 0.01 to 50, (C) terminal vinyl number is 0.2 or less per 1,000 carbon atoms, (D) melt strength (MS160 (mN)) measured at 160° C. and MFR are satisfied with MS160>90?130×log(MFR), (E) melt strength (MS190 (mN)) measured at 190° C. and MS160 are satisfied with MS160/MS190<1.8, and (F) fluidized activation energy (Ea (kJ/mol)) and d are satisfied with 127?0.107d<Ea<88?0.060d.

Abstract: An object of the present invention relates to provide an ethylene polymer having excellent mechanical strength and excellent molding processability in a wide molding processing temperature range. The invention relates to use an ethylene polymer comprising a repeating unit derived from ethylene, or a repeating unit derived from ethylene and a repeating unit derived from a C3-8 ?-olefin, the ethylene polymer being satisfied with the following (A) to (F). (A) Density (d(kg/m3)) is from 910 to 970, (B) MFR(g/10 min)) is from 0.01 to 50, (C) terminal vinyl number is 0.2 or less per 1,000 carbon atoms, (D) melt strength (MS160 (mN)) measured at 160° C. and MFR are satisfied with MS160>90?130×log(MFR), (E) melt strength (MS190(mN)) measured at 190° C. and MS160 are satisfied with MS160/MS190<1.8, and (F) fluidized activation energy (Ea(kJ/mol)) and d are satisfied with 127?0.107 d<Ea<88?0.060 d.

Abstract: A non-crosslinked polyethylene foam is disclosed, which is obtained by foaming a polyethylene resin satisfying the following requirements (a) to (d): (a) a density is 890-980 kg/m3; (b) the number of long chain branches having 6 or more carbon atoms is 0.01-3 per 1,000 carbon atoms; (c) a melt tension (mN) measured at 190° C. (MS190) and MFR (melt flow rate: g/10 min, 190° C.) under a load of 2.16 kg are satisfied with the following formula (1): MS190>22×MFR?088 ??(1) and a melt tension (mN) measured at 160° C. (MS160) and MFR (melt flow rate: g/10 min, 190° C.) under a load of 2.16 kg are satisfied with the following formula (2): MS160>110?110×log (MFR) ??(2) (d) an endothermic curve obtained in temperature-rise measurement by a differential scanning calorimeter shows one peak.

Abstract: A silane-crosslinking expandable polyolefin resin composition that is flowable before foaming and composition, does not cause degassing even when foaming is carried out immediately after heat molding without the conventional crosslinking operation, and gives a crosslinked foam having superior heat resistance (heat deformation properties) after the foaming. The silane-crosslinking expandable polyolefin resin composition includes 100 parts by weight of a mixture of 5-90% by weight of a silane-grafted polyethylene resin obtained by melt mixing 100 parts by weight of LLDPE having a molecular weight distribution of 5 or less and a density of 0.87-0.945 g/cm3, 0.1-5 parts by weight of a vinyl-functional silane compound and 0.01-0.5 parts by weight of a free radical generator, and 95-10% by weight of a polyolefin resin; and 2-20 parts by weight of a specified organic blowing gas.

Abstract: A silane-crosslinking expandable polyolefin resin composition that is flowable before foaming and composition, does not cause degassing even when foaming is carried out immediately after heat molding without the conventional crosslinking operation, and gives a crosslinked foam having superior heat resistance (heat deformation properties) after the foaming. The silane-crosslinking expandable polyolefin resin composition includes 100 parts by weight of a mixture of 5-90% by weight of a silane-grafted polyethylene resin obtained by melt mixing 100 parts by weight of LLDPE having a molecular weight distribution of 5 or less and a density of 0.87-0.945 g/cm3, 0.1-5 parts by weight of a vinyl-functional silane compound and 0.01-0.5 parts by weight of a free radical generator, and 95-10% by weight of a polyolefin resin; and 2-20 parts by weight of a specified organic blowing gas.

Abstract: A high-expanded crosslinked foam having excellent flexibility, toughness, heat resistance and compressibility, a smooth surface and uniform cells, and a polyolefin resin composition to be used therefore are provided.

Abstract: A high-expanded crosslinked foam having excellent flexibility, toughness, heat resistance and compressibility, a smooth surface and uniform cells, and a polyolefin resin composition to be used therefore are provided. A polyolefin-based crosslinked foam has the following characteristics (a) to (c) and is obtained by the crosslinked foaming of a foaming polyolefin resin composition comprising a polyolefin resin composition and a foaming agent: (a) Gel fraction is from 10% to 90%; (b) Degree of swelling is 30 or less; and (c) When glass transition point determined from the temperature dependence of dynamic viscoelasticity is represented by the peak of tan &dgr; determined by the measurement of dynamic viscoelasticity at a frequency of 10 Hz, there is observed no peak or one peak, if any, and the ratio &agr; of storage modulus at 0° C. (E′0) to storage modulus at 100° C. (E′100) (&agr;=log E′0/E′100) is from 10 to 30.

Abstract: A molding resin having improved processability is disclosed, comprising a copolymer of ethylene and an .alpha.-olefin having 3 to 12 carbon atoms and having the following properties(a) a weight average molecular weight Mw to number average molecular weight Mn ratio (Mw/Mn) of 3 or less as determined by gel permeation chromatography;(b) a density of 0.850 to 0.980 g/cm.sup.3 ;(c) a melt flow rate of 0.5 to 5 g/10 min as measured at 190.degree. C. under a load of 2,160 g according to JIS K7210, Condition 4;(d) a slope S of storage modulus G' in a frequency region of from the frequency (f.sub.c) at which storage modulus G' and loss modulus G" agree with each other to f.sub.c /10, which is obtained from the frequency dependence of dynamic viscoelasticity, i.e., .DELTA.log G'/.DELTA.log f, of more than 0.70 and less than 0.90; and(e) an activation energy of flow .DELTA.H of 35 kJ/mol or less as obtained at 160 to 220.degree. C.