Toyo Seikan Group Holdings, Ltd.

Toyo Seikan Kaisha, Ltd.

Toyo Seikan Co., Ltd.

Yuuki Tashiro

Takayuki Ishihara

Kota Mori

Azusa Otsuki

Toshiki Yamada

Seishi Yoshikawa

Kenji Ichikawa

Go Saito

Yukiko Hirayama

Koki Shibata

Kousuke Ueda

Yuusuke Itou

Toshihiro Tanabe

Masashi Atsugi

Gou Saitou

A gas-barrier multilayered container having (i) a layer of a propylene type polymer which chiefly includes a homopolypropylene having an isotactic index of not less than 93%, and (ii) a layer of an ethylene-vinyl alcohol copolymer having not less than two crystal melting peak temperatures. Also disclosed is a lustrous and shock-resistant multilayered container having at least (i) an outermost layer of a propylene type polymer A which chiefly includes a homopolypropylene having a melt flow rate of 2.0 to 10.0 g/10 min., and (ii) an inner layer of a propylene type polymer B which chiefly includes a homopolypropylene having a melt flow rate of not more than 1.0 g/10 min.

Multilayered containers

A multilayer container including: an outermost layer (1) containing a propylene-based polymer A containing homopolypropylene as a main component having a melt flow rate in a range of 2.0 to 10.0 g/10 min; an inner layer (2) containing 50 to 99% by weight of a propylene-based polymer B containing homopolypropylene as a main component having a melt flow rate of not more than 5.0 g/10 min and an isotactic index of not less than 93%, and 1 to 50% by weight of an ethylene-&#x3b1;-olefin copolymer C; and a barrier layer (4) occupying 5 to 20% by weight of the whole container. The ratio (L/D) of container height (L) to diameter (D) is not less than 0.5, and a volume shrinkage based on volume measured before and after heat sterilization at 121&#xb0; C. for 30 minutes is not more than 5%.

Heat-resistant multilayer container and method for producing the same

A multilayered container includes at least a polyolefin inner layer; an adhesive layer; a gas-barrier layer; an oxygen-absorbing layer; a gas-barrier layer; an adhesive layer; a polyolefin outer layer, and having at least a body portion and a bottom portion, wherein the gas-barrier layers include an ethylene-vinyl alcohol copolymer, the oxygen-absorbing layer includes an oxygen-absorbing resin composition that contains the ethylene-vinyl alcohol copolymer and an oxidizing organic component, an adsorbing agent is contained on the side inside of said gas-barrier layer, the thickness of the multilayered container at the thinnest portion is not more than 430 &#x3bc;m, and the amount of oxygen absorbed after the heat-sterilization is not less than 23 cc per gram of the oxygen-absorbing resin composition. Despite of this decreased thickness, the multilayered container maintains excellent oxygen-barrier property and property for retaining flavor of the content even when it is subjected to the retort sterilization.

Multilayered container

[Problems] To provide a multilayered plastic container which exhibits excellent oxygen-barrier property of the ethylene-vinyl alcohol copolymer to a sufficient degree without the need of providing a special adhesive layer, and which, when a polyolefin resin is used to form the inner and outer layers, too, not only permits the ethylene-vinyl alcohol copolymer to be effectively used but also makes it very easy to set the conditions for satisfying predetermined properties. [Means for Solution] A multilayered plastic container comprising an oxygen-barrier layer of an ethylene-vinyl alcohol copolymer that serves as a matrix and an adhesive intermediate layer of a blend of an ethylene-vinyl alcohol copolymer and a maleic anhydride-modified olefin resin neighboring each other between an inner layer and an outer layer, wherein both the ethylene-vinyl alcohol copolymer used for forming said oxygen-barrier layer and the ethylene-vinyl alcohol copolymer used for forming said adhesive intermediate layer have an ethylene content of 20 to 60 mol %; and said adhesive intermediate layer contains said ethylene-vinyl alcohol copolymer and the maleic anhydride-modified olefin resin at a weight ratio of 4:6 to 8:2, and contains, as said maleic anhydride-modified olefin resin, a high MFR component having an MFR at 190&#xb0; C. of 100 to 500 g/10 min. and a low MFR component having an MFR at 190&#xb0; C. of 2 to 90 g/10 min.

Multilayered plastic container

Growing community of inventors

Yokohama, Japan

Yuuki Tashiro