Denka Company Limited

Denki Kagaku Kogyo Kabushiki Kaisha

Tadashi Sawasato

Eiji Sato

Hitoshi Nakazawa

Jun Yoshida

Mutsumi Matsumoto

Kouta Nagaoka

Hideki Toya

Keiji Takano

Yuya Nakamura

Shinya Uekusa

Katumi Ito

A block copolymer composition containing at least one type of block copolymer component obtained by using a vinyl aromatic hydrocarbon and a conjugated diene, wherein the block copolymer composition satisfies the conditions (1) to (3) indicated below. (1) The weight-average molecular weight is at least 100000 and at most 300000, and the conjugated diene content is at least 18 mass % and at most 35 mass %. (2) The vinyl aromatic hydrocarbon block percentage is at least 80% and at most 100% relative to the total amount of the vinyl aromatic hydrocarbon. (3) At least 30 mass % and at most 60 mass % of block copolymer components having a conjugated diene content of at least 30 mass % are included.

Block copolymer composition, heat shrink film using same, and package provided with heat shrink film

To provide a vinylidene-fluoride resin film having low cloudiness and good visibility of a pattern and the like of a decorative film of a lower layer although having a matte tone with low glossiness. The vinylidene-fluoride resin film comprises crosslinked acrylic acid ester resin particles, in which the crosslinked acrylic acid ester resin particles have an average particle diameter of 5% or more and 40% or less to the thickness of the vinylidene-fluoride resin film and the arithmetic average surface roughness (Ra) of the vinylidene-fluoride resin film is 0.4 &#x3bc;m or more and less than 2 &#x3bc;m.

Vinylidene-fluoride resin film

Provided is an ECTFE resin composition that is superior in transparency and resistant to yellowing for an extended period of time. The ECTFE resin composition generates a smaller amount of acidic gases, for example, when it is extrusion molded at high temperature. It is an ethylene-chlorotrifluoroethylene copolymer resin composition including a bisphenol-based antioxidant. It is preferably an ethylene-chlorotrifluoroethylene copolymer resin composition additionally including a phosphorus-based antioxidant.

Resin composition and membrane structure comprising the same

A block copolymer composition with a good balance of physical properties suitable for various types of packaging such as food product containers, beverage containers, industrial containers and blister packs, having excellent transparency, gloss, strength, rigidity and formability, having excellent anti-blocking properties and anti-sticking properties, and excelling in the aforementioned properties even when used in mixture with vinyl aromatic hydrocarbon-type polymers is offered. A block copolymer composition of a vinyl aromatic hydrocarbon and a conjugated diene, wherein a block copolymer component (I) having a molecular weight peak in the range of molecular weight 150,000 to 300,000 and comprising tapered blocks has a conjugated diene content of 10 to 20 mass %; a block copolymer component (II) having a molecular weight peak in the range of molecular weight 50,000 to 140,000 and comprising tapered blocks has a conjugated diene content of 30 to 50 mass %; and a ratio (I)/(II) between molecular weight peak areas occupied by block copolymer component (I) and block copolymer component (II) in the block copolymer composition is 20/80 to 80/20.

Block copolymer composition, and sheet

A resin composition having as a main ingredient a block copolymer composed of at least one type of vinyl aromatic hydrocarbon and a conjugated diene, the resin composition being characterized in that the Vicat softening point temperature measured under a 10-N load as per ISO306 is 65-90&#xb0; C., the flexural strength measured as per ISO178 is 58-80 MPa, the proportion of the conjugated diene in the resin composition is 10-25 mass %, and the resin composition has molecular weight peaks, the peaks being derived from the block copolymer composed of the vinyl aromatic hydrocarbon and the conjugated diene, at molecular weights in the ranges of 70,000-150,000 and 150,000-350,000, respectively.

Resin composition and heat-shrinkable film thereof

The present invention relates to tubular forming material made of a composition comprising block copolymers each made of a vinyl aromatic hydrocarbon and a conjugated diene, which has a uniaxial elongation viscosity at 88&#xb0; C. at a strain rate of 0.5 sec&#x2212;1 satisfying the following formula between 1.0 sec and 2.8 sec after initiation of elongation,0.25&#x3c;(LOG &#x3b7;2.8&#x2212;LOG &#x3b7;1.0)/(2.8&#x2212;1.0)&#x3c;0.4wherein &#x3b7;1.0 and &#x3b7;2.8 represent uniaxial elongation viscosities (Pa&#xb7;sec) at elongation times of 1.0 sec and 2.8 sec, respectively, when measured by a Meissner model elongation viscometer. The composition contains three block copolymers at a specified blend ratio.

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Ichihara, Japan

Tadashi Sawasato