Kuraray Co., Ltd.

Idemitsu Petrochemical Co., Ltd.

Taichi Negi

Satoshi Hirofuji

Toshiaki Sato

Tohei Moritani

Sumio Itamura

Nobuo Tanaka

Keisuke Funaki

Takashi Sumitomo

Komei Yamasaki

Syuji Kawai

Akimasa Aoyama

Shiro Nagata

Kiyoshi Yonezu

Hidemasa Oda

Akira Mochizuki

Nobuhiro Hata

Hiromichi Nakano

Takuji Okaya

Kaoru Ikeda

Takeshi Moritani

Kenji Matsumoto

Akihiko Kawasaki

Keiji Matsumura

Syukiti Kawamura

Kenji Satoh

Makio Tokoh

Kyoichiro Ikari

Fuel tank

Purging agent and purging method

Resin composition and multilayered structure comprising the same

Disclosed herein is a fuel tank of multi-layer construction having good impact resistance as well as good barrier properties for gasoline, especially one containing methanol and MTBE. The fuel tank comprises (a) inner and outer layers of high-density polyethylene, (b) intermediate layers of adhesive resin, and (c) a core layer of ethylene-vinylalcohol copolymer, with said core layer (c) being shifted to the inside. For better performance, the layer (c) has a thickness which satisfies the formula below.

Provided are resin compositions comprising the following (A), (B), (C), which is at least one member selected from (C.sub.1) through (C.sub.3) and (D):

Resin composition

Provided are resin compositions comprising the following (A), (B), (C), which is at least one member selected from (C.sub.1) through (C.sub.3), and (D):

A resin composition comprising 5 to 95 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration. The resin composition has gas barrier properties and a markedly improved heat resistance.

A heat shrinkable film or multilayered film comprising at least one layer comprising an EVOH (A) having an average ethylene content of 20 to 60 mol % and an areal shrinkage when immersed in hot water at 90.degree. C. for 1 minute of at least 10% and having thermal characteristics satisfying the following condition (i)

Heat shrinkable film and multilayered film

A multilayered container comprising an intermediate layer of a resin composition (A) which comprises 50-95% by weight of a specific EVOH, and 50-5% by weight of an inorganic filler, and inner and outer layers of a moisture resistant thermoplastic resin (B), at least the body wall part of the container comprising multiplicity of regions in which substantially 2-dimensional thin layers of the inorganic filler extend parallel with the wall surface and laminated with each other, said layer of said resin composition (A) having a specific moisture permeability. The multilayered container can readily be prepared by thermoforming from the corresponding multilayered structure. Food packages obtained by filling the multilayered container of the present invention with food, sealing it and then sterilizing the package under a condition where heat and moisture act at the same time as in retorting are resistant against impermeation of oxygen that would deteriorate the food contained therein, thus exhibiting excellent storage capability, and have good container appearance.

Multilayered container and package utilizing the same

Provided are multilayered structures comprising at least 2 layers of a layer which comprises a resin composition comprising:

Multilayered structure

A multi-layer material with a layer (A) of a saponified product of an ethylene-vinyl acetate copolymer having an ethylene content of 20 to 60 mol % and a degree of saponification of at least 90% and a layer (B) of a styrene-based polymer having mainly syndiotactic configuration, or a resin composition comprising 5 to 95 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A) having an ethylene content of 20 to 60 mol % and a degreee of saponification of at least 90% and 95 to 5 parts by weight of a styrene-based polymer (B) having mainly syndiotactic configuration has gas barrier properties and markedly improved heat resistance. In a molding comprising the resin composition or the multi-layer material, contents (food) can be stored for a long period of time at ambient temperature. Moreover, after retort sterilization, the container can be heated by boiling, or in a microwave oven or a grill oven (at 220 to 240.degree. C.) in the condition that the contents (food) are placed in the container.

Multi-layer material having gas barrier properties

A hot drawn multilayered structure including a layer of an ethylene-vinyl alcohol copolymer composition containing 70 to 95 wt % of EVOH having an ethylene content of 25 to 60 mol % and a saponification degree of at least 90%; and 5 to 30 wt % of an aliphatic copolymer polyamide containing capramide as a main structural unit, having a ratio of the number of methylene gorups to the number of amide groups satisfying the equation:

Process of vacuum-air pressure drawing of a laminate containing an

Provided are multilayered structures comprising at least 2 layers consisting of a layer of a composition (C) comprising 50 to 95 wt % of an ethylene-vinyl alcohol copolymer (A) and 50 to 5 wt % of a thermoplastic polyester (B) comprising at least 50 mol % of isophthalic acid base on the total moles of carboxylic acid component and 0.1 to 30 mol % of 1,3-bis (.beta.-hydroxyethoxy)benzene and/or diethylene glycol based on the total moles of diol component, and a layer of a thermoplastic resin (D), said (A) and (D) satisfying the following relationship (I):

The present invention provides a heat-resistant container comprising an ethylene-vinyl alcohol copolymer layer and a crystalline polyester layer. In particular, when an ethylene-vinyl alcohol copolymer containing a drying agent is used, the obtained container is both ovenable and retortable, thereby being highly useful.

Heat resistant container

A resin composition comprising from about 95 to about 30 parts by weight of a saponified product of an ethylene-vinyl acetate copolymer (A), comprising ethylene units in an amount of from about 20 to about 55 mole percent, and exhibiting a degree of saponification of the vinyl acetate component of at least about 90 mole percent, and from about 5 to about 70 parts by weight of a saponified product of a modified ethylene-vinyl acetate copolymer (B) comprising pyrrolidone ring-containing units in an amount of from about 0.1 to about 10 mole percent, and ethylene units in an amount of from about 20 to about 55 mole percent, and exhibiting a degree of saponification of the vinyl acetate component of at least about 90 mole percent, and a multilayered structure made therewith, preferably formed by high speed thermodrawing, exhibiting uniform gas barrier properties and producing a product without pinholes, cracks, and localized areas of uneven stretching.

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Kurashiki, Japan

Taichi Negi