Mitsui Petrochemical Industries, Ltd.

Mitsui Chemicals, Inc.

Norio Kaneshige

Shinya Matsunaga

Toshiyuki Tsutsui

Akira Todo

Mamoru Takahashi

Seiichi Ikeyama

Mikio Hashimoto

Mamoru Kioka

Satoru Moriya

Shinichi Kojoh

Kenji Sugimura

Masahiro Kishine

Teruhisa Kojima

An ethylene copolymer composition comprising an ethylene/&#x3b1;-olefin copolymer, A-4, of ethylene with an &#x3b1;-olefin of 3 to 20 carbon atoms in an amount of 65-98% by weight, whose melt tension, MT, at 190&#xb0; C. and MFR satisfy the relation MT&#x3e;2.2&#xd7;MFR, and at least one crystalline polyolefin, B-2, in an amount of 1-40% by weight selected from the group consisting of, B-I, an ethylene homopolymer or a copolymer of ethylene with an &#x3b1;-olefin of 3 to 20 carbon atoms, prepared using a non-metallocene type catalyst, B-II, a propylene hompolymer or a copolymer of propylene with at least one olefin selected from ethylene and an &#x3b1;-olefin of 4 to 20 carbon atoms, and, B-III, a homopolymer of an &#x3b1;-olefin of 4 to 20 carbon atoms or a copolymer of &#x3b1;-olefins of 4 to 20 carbon atoms, and articles made from the composition.

Ethylene copolymer composition

An ethylene copolymer composition comprising an ethylene/&agr;-olefin copolymer (A-1), which has a density, a melt flow rate (MFR), an amount of a n-decane-soluble portion in the specific ranges and whose melt tension (MT) at 190&deg; C. and MFR satisfy the relation MT>2.2&times;MFR , and one (co)polymer selected from the group consisting of (B-1) a low-density polyethylene obtained by high-pressure radical polymerization, (B-2) a crystalline polyolefin and (B-3) an olefin type elastomer. Also disclosed is an ethylene copolymer composition comprising an ethylene/&agr;-olefin copolymer composition and the low-density polyethylene (B-1) obtained by high-pressure radical polymerization, said ethylene/&agr;-olefin copolymer (A-2) and (A-3) both having physical properties similar to those of the above ethylene/&agr;-olefin copolymer (A-1) and having intrinsic viscosities different from each other. The ethylene copolymer compositions of the invention are excellent in heat stability and moldability, and able to form films of high transparency, high mechanical strength and anti-blocking resistance.

Crystalline polypropylene contains components insoluble in 64&deg; C. decane satisfying the characteristics involving intrinsic viscosity; Mz/Mn; pentadvisotacticity, D value and Mw/Mn, are excellent in hardness and rigidity, high in melt tension, and excellent in molding properties. Processes for preparing such crystalline polypropylenes, and polypropylene compositions and thermoformed products that contain such crystalline polypropylenes are also described. The number-average molecular weight Mn of the components insoluble in 64&deg; C. decane is preferably 25000 or more.

Crystalline polypropylenes, process for preparing thereof, polypropylene compositions, and thermoformed products

Ethylene copolymer compositions comprise: an ethylene/.alpha.-olefin copolymer component comprising at least one ethylene/.alpha.-olefin copolymer having a density within a specific range, a melt flow rate (MFR) within a specific range, an amount of an n-decane-soluble portion within a specific range and a melt tension (MT) that satisfies a specific relation with the MFR; and a (co)polymer component comprising one (co)polymer selected from the group consisting of a low-density polyethylene obtained by high-pressure radical polymerization, a crystalline polyolefin and an olefin elastomer. The ethylene copolymer compositions are excellent in heat stability and moldability, and able to form films of high transparency, high mechanical strength and anti-blocking resistance.

An ethylene copolymer composition comprising an ethylene/.alpha.-olefin copolymer [A-I] which has a density, a melt flow rate (MFR), an amount of a n-decane-soluble portion in the specific ranges and whose melt tension (MT) at 190.degree. C. and MFR satisfy the relation MT&gt;2.2.times.MFR.sup.-0.84 and one (co)polymer selected from the group consisting of [B-1] a low-density polyethylene obtained by high-pressure radical polymerization, [B-2] a crystalline polyolefin and [B-3] an olefin type elastomer. Also disclosed is an ethylene copolymer composition comprising an ethylene/.alpha.-olefin copolymer composition and the low-density polyethylene [B-1] obtained by high-pressure radical polymerization, said ethylene/.alpha.-olefin copolymer composition comprising ethylene/.alpha.-olefin copolymers [A-2] and [A-3] both having physical properties similar to those of the above ethylene/.alpha.-olefin copolymer [A-1] and having intrinsic viscosities different from each other. Further disclosed is an ethylene copolymer composition comprising an ethylene/.alpha.-olefin copolymer [A-4] which has a density, a melt flow rate (MFR), a weight of a n-decane-soluble portion in the specific ranges and whose melt tension (MT) at 190.degree. C. and MFR satisfy the relation MT&lt;2.2.times.MFR.sup.-0.84, and one (co)polymer selected from the above group consisting of [B-1], [B-2] and [B-3]. Still further disclosed is an ethylene copolymer composition comprising an ethylene/.alpha.-olefin copolymer composition and a low-density polyethylene [B-4] obtained by high-pressure radical polymerization, said ethylene/.alpha.-olefin copolymer composition comprising ethylene/.alpha.-olefin copolymers [A-5] and [A-6] both having physical properties similar to those of the above ethylene/.alpha.-olefin copolymer [A-4] and having intrinsic viscosities different from each other. The ethylene copolymer compositions of the invention are excellent in heat stability and moldability, and able to form films of high transparency, high mechanical strength and anti-blocking resistance.

A copolyester having an intrinsic viscosity, measured in o-chlorophenol at 25.degree. C., of 0.3 to 1.5 dl/g and being derived from dicarboxylic acid units composed of 95 to 60 mole % of isophthalic acid units and 5 to 40 mole % of 2,6-naphthalenedicarboxylic acid units and dihydroxy compound units composed of 95 to 70 mole % of ethylene glycol units and 5 to 30 mole % of 1,3-bis(2-hydroxyethoxy)benzene units; a gas barrier imparting agent composed of the copolyester; a polyester composition composed of (A) a polyethylene terephthlate and (B) the copolyester; and a film, a preform and a container composed of the polyester composition. Also provided are a polyester laminated structure, a stretched laminated structure, a preform and a laminated blow-molded article each composed of (C) a polyalkylene terephthalate layer and (D) a copolyester layer composed of the copolyester or the polyester composition.

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Waki-cho, Japan

Norio Kaneshige