Showa Denko K.k.

Showa Denko Kabushiki Kaisha

Showa Highpolymer Co., Ltd.

Japan Polyolefins Co., Ltd.

Showa Denko Plastic Products Co., Ltd.

Kazuyuki Watanabe

Hisayoshi Yanagihara

Satoshi Iwamoto

Hirotoshi Takahashi

Kazuharu Itoh

Katsuaki Tsutsumi

Toshiyuki Iwashita

Yasuhiro Nohara

Osamu Miyachi

Juichi Kasai

Ryuji Sakaguchi

Akio Harada

Wei-Zhong Zhang

Meiko Saihata

Sakuyoshi Nakagami

Chiaki Okumura

Shimako Matsumoto

Yuji Kira

Takao Nasu

The object of the present invention is to provide a layered film which exhibits, when used as a sealant film, excellent openability, good clouding property, high water vapor barrier property and superior seal strength stability and which is suitable as a medical packaging material, and to provide a packaging product thereof. The layered film comprises at least two layers of a resin composition layer &lsqb;layer (A)&rsqb; comprising (a) from 60 to 90% by mass of linear low-density polyethylene produced using a single site catalyst and (b) from 40 to 10% by mass of a polybutene-1, and a high-density polyethylene layer &lsqb;layer (B)&rsqb; comprising (c) a high-density polyethylene having a density of 0.950 to 0.970 (g/cm ). The packaging product has the layer (A) of the layered film as a sealant layer.

Layered film and packaging product thereof

There are provided a propylene-based polymer characterized in that (1) the xylene-extraction insoluble portion (XI) is 99.0 wt % or greater, (2) the isotactic pentad ratio (IP) is 98.0% or greater as measured by,C nuclear magnetic resonance spectroscopy, (3) the isotactic average chain length (N) is 500 or greater, and (4) the total amount of each of the fractions obtained by column separation of the xylene insolubles whose average chain length (N,) is 800 or greater accounts for 10 wt % or more of the entirety, and a method for its production, as well as a propylene-based polymer composition prepared by combining with this propylene-based polymer at least a nucleating agent in the range of 0.05-15 wt %. In addition, there are provided a polymerization catalyst component allowing the production of such a propylene-based polymer, and a method for its production.

Propylene-based polymer, method for its production, composition thereof, catalyst component for polymerization, and method for its production

A mixture comprising: a composition containing polypropylene possessing specific properties, 45&tilde;70 parts by weight; a polyolefin resin possessing specific properties, 5&tilde;20 parts by weight; an inorganic filler selected from precipitated calcium carbonate, hydrated silicic acid, and hydrated calcium silicate, 5&tilde;30 parts by weight; and an inorganic filler selected from talc, mica, and potassium titanate, 5&tilde;30 parts by weight; is superior in scratch resistance, moldability, and balance of rigidity and impact resistance. In addition, a laminate having a layer of this mixture has superior gloss. This mixture and the laminate are useful in automobile parts, electric and electronic parts, packaging materials, etc.

Propylene resin composition, molded articles thereof and propylene resin laminate

Propylene-based polymer, method of its production, composition thereof,

A resin mixture including a composition containing polypropylene that includes a portion insoluble in xylene, an isotactic pentad fraction of not less than 96.5% and an isotactic average chain length of not less than 90, 45.about.70 parts by weight; a polyolefin resin, 5.about.20 parts by weight; an inorganic filler selected from precipitated calcium carbonate, hydrated silicic acid, and hydrated calcium silicate, 5.about.30 parts by weight; and an inorganic filler selected from talc, mica, and potassium titanate, 5.about.30 parts by weight; is superior in scratch resistance, moldability, and balance of rigidity and impact resistance. In addition, a laminate having a layer of this mixture has superior gloss. This mixture and the laminate are useful in automobile parts, electric and electronic parts, packaging materials, etc.

Propylene resin composition including isotactic polypropylene and

Propylene resin composition and molded article thereof

A propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase, said matrix phase comprising (a) polypropylene; said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and said dispersed phase comprising an outer layer comprising (b) propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (c) crystalline polyethylene dispersed therein a plurality of particles comprising an outer layer comprising (b') propylene-.alpha.-olefin copolymer rubber and an inner layer comprising (a') polypropylene, a propylene block copolymer comprising a matrix phase and a dispersed phase dispersed in said matrix phase, said matrix phase comprising (a) polypropylene; said dispersed phase having an average particle diameter of from 0.1 to 5 .mu.m; and said dispersed phase comprising (b) propylene-.alpha.-olefin copolymer rubber having therein at least one particle comprising (a') polypropylene and at least one particle comprising (c) crystalline polyethylene. Propylene block copolymer resin compositions comprising the propylene block copolymers, and processes for producing a propylene block copolymers.

Propylene block copolymer and process for producing the same

A propylene block copolymer, a process for preparation of the propylene block copolymer, and a propylene resin composition comprising the propylene block copolymer. The propylene block copolymer comprises (a) from 35 to 95% by weight of a polypropylene block and (b) from 10 to 65% by weight of a block of a copolymer of a propylene and other .alpha.-olefins, the propylene block copolymer having: (i) in a crystallization temperature curve determined by a differential scanning calorimeter, besides a main peak, secondary peaks in a temperature range of from 90.degree. to 100.degree. C., and a proportion of the area of the secondary peaks to that of a main peak of from 1.5 to 10%; and (ii) a relationship between an amount of a soluble content on xylene extraction at 25.degree. C. and a proportion of the area of the secondary peaks to that of the main peak represented by equation (I):

Propylene block copolymer, process for preparation thereof and propylene

A multilayered laminate, which comprises a plastic substrate, a thin film of a metal or a metal oxide, formed on a surface of the substrate, and a layer formed on a surface of the thin film, the layer being selected from the group consisting of: (a) a polyvinyl alcohol copolymer emulsion, obtained by aqueous emulsion polymerization of a vinyl acetate monomer, an ethylene monomer and a polyvinyl alcohol; (b) a resin emulsion composition obtained by mixing (i) a polyvinyl alcohol copolymer emulsion, obtained by aqueous emulsion polymerization of a vinyl acetate monomer, an ethylene monomer and a polyvinyl alcohol with (ii) an aqueous solution of polyvinyl alcohol resin; (c) saponified resin of olefin-vinyl acetate copolymer; (d) polyamide resin; and (e) polyvinyl alcohol resin, and a heat-sealable packaging material based on the multilayered laminate.

Multilayers laminate serving as a good barrier against an oxygen gas or

A multilayered laminate which comprises (A) at least one thermoplastic resin layer of an ethylenic copolymer having ethylene and at least one of acrylamide derivatives, methacrylamide derivatives, ester monomers, ether compounds, acid compounds having an unsaturated bond between carbon atoms, and mixtures thereof; (B) other thermoplastic resin layers; and (C) a hydroscopic gas barrier intermediate layer and a method of improving the transparency of polypropylene.

Ethylenic copolymer thermoplastic resin laminates

A polyolefin composition, which comprises: (A) 1 to 99% by weight of a polyolefin having the following properties of (a) to (e); (a) a ratio of kinematic viscosity .eta..sub.1 at a frequency of 10.sup.-1 rad/sec to kinematic viscosity .eta..sub.2 at a frequency of 10 rad/sec at a temperature of 190.degree. C. according to a kinematic viscoelasticity determination method of 4 to 20, (b) a crystallization peak temperature Tcp according to a Differential Scanning Calorimetry of 110.degree. C. to 130.degree. C., (c) a ratio (Tmp/Tcp) of melting peak temperature Tmp to crystallization peak temperature Tcp according to a Differential Scanning Calorimetry of 1.1 to 1.5, (d) Tmp/(Tmp-Tcp)=3.0 to 9.8, and (e) a crystal structure exhibiting a-axial orientation in a diffraction pattern according to a X-ray diffraction method, and (B) 99 to 1% by weight of a propylene resin having the following properties of (f) and (g); (f) a ratio of kinematic viscosity .eta..sub.1 at a frequency of 10.sup.-1 rad/sec to kinematic viscosity .eta..sub.2 at a frequency of 10 rad/sec at a temperature of 190.degree. C. according to a kinematic viscoelasticity determination method of below 4, and (e) and no crystallization structure exhibiting a-axial orientation in a diffraction pattern according to a X-ray diffraction method.

Polyolefin composition, molded article thereof and multilayered laminate

A propylene block copolymer comprising: (a) a propylene homopolymer part having (i) an insoluble amount on xylene extraction at 25.degree. C. of 99.0% by weight or more; (ii) an isotactic pentad fraction of 98.0% or more; (iii) an isotactic average chain length of 500 or more; and (iv) a total amount of fractions having an isotactic average chain length of 800 or more obtained in a column chromatographic separation of 10% by weight or more, and (b) a copolymer part comprising propylene and at least one of ethylene and an .alpha.-olefin having from 4 to 12 carbon atoms, the proportion of the propylene homopolymer part (a) being from 50 to 97% by weight based on the total amount of the propylene homopolymer part (a) and the copolymer part (b), and the proportion of the copolymer part (b) being from 3 to 50% by weight based on the total amount of the propylene homopolymer part (a) and the copolymer part (b).

Propylene block copolymer, process for producing the same, and resin

A polyolefin composition, which comprises: (A) 1 to 99% by weight of a polyolefin in having the following properties of (a) to (e); (a) a ratio of kinematic viscosity .eta..sub.1 at a frequency of 10.sup.-1 rad/sec to kinematic viscosity .eta..sub.2 at a frequency of 10 rad/sec at a temperature of 190.degree. C. according to a kinematic viscoelasticity determination method of 4 to 20, (b) a crystallization peak temperature Tcp according to a Differential Scanning Calorimetry of 110.degree. to 130.degree. C., (c) a ratio (Tmp/Tcp) of melting peak temperature Tmp to crystallization peak temperature Tcp according to a Differential Scanning Calorimetry of 1.1 to 1.5, (d) Tmp/(Tmp-Tcp)=3.0 to 9.8, and (e) a crystal structure exhibiting a-axial orientation in a diffraction pattern according to a X-ray diffraction method, and (B) 99 to 1% by weight of a propylene resin having the following properties of (f) and (g); (f) a ratio of kinematic viscosity .eta..sub.1 at a frequency of 10.sup.-1 rad/sec to kinematic viscosity .eta..sub.2 at a frequency of 10 rad/sec at a temperature of 190.degree. C. according to a kinematic viscoelasticity determination method of below 4, and (e) and no crystallization structure exhibiting a-axial orientation in a diifraction pattern according to a X-ray diffraction method.

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Oita, Japan

Kazuyuki Watanabe