Kuraray Co., Ltd.

Asahi Glass Company, Limited

Ube Industries, Inc.

Adeka Corporation

Kuraray Co., Ltd., Kurashiki Plant

Koichi Uchida

Atsushi Funaki

Takashi Yamashita

Eiichi Nishi

Koji Nakamura

Tetsuya Hara

Hideaki Oka

Tsugunori Kashimura

Hirofumi Kikuchi

Masahide Tsuzuki

Tsuyoshi Iwasa

Koji Beppu

Tomoharu Nishioka

Hideharu Matsuoka

Yuji Munesawa

Hiroki Yamasaki

Tsuyoshi Kubo

Toshiharu Ogi

Koji Ube Industries Ltd Nakamura

Takashi Kuraray Co Ltd Yamashita

Toshiharu Ube Industries Ltd Ogi

Tomoharu c/o Ube Chemical Factory Ube I Nishioka

Takashi; c/o Kuraray Co Ltd Yamashita

Tsuyoshi c/o Ube Chemical Factory Ube Indus Kubo

A multilayer tube including at least three layers including a layer (a) formed of (A) polyamide 11 and/or polyamide 12, a layer (b) formed of (B) a polyamide (semi-aromatic polyamide) including a dicarboxylic acid unit containing a terephthalic acid and/or naphthalenedicarboxylic acid unit in a proportion of 50 mol % or more based on all dicarboxylic acid units, and a diamine unit containing an aliphatic diamine unit having a carbon number of 9 to 13 in a proportion of 60 mol % or more based on all diamine units, and a layer (c) formed of (C) a fluorine-containing polymer having introduced into the molecular chain thereof a functional group having reactivity with a polyamide-based resin, is provided as a multilayer tube excellent in an alcohol gasoline permeation-preventing property, interlayer adhesion, low-temperature impact resistance, heat resistance and chemical resistance.

Multilayer tube

A polyamide composition comprising 50 to 90 parts by weight of (A) semiaromatic polyamides having dicarboxylic acid units containing 60 to 100 mole % of terephthalic acid units and diamine units containing 60 to 100 mole %, in total, of 1,9-nonanediamine units and/or 2-methyl-1,8-octanediamine units, and 50 to 10 parts by weight of (B) aliphatic polyamides in which the average of total carbon atoms of dicarboxylic acid units and diamine units per one amide group is 7 to 12; having excellent moldability, toughness, light-weightness, hot water and steam resistance, heat resistance, mechanical characteristics, low water absorption, chemical resistance and melt stability; and are applicable for molding at low temperature with a conventional steam-heating or a conventional hot-water-heating type mold to give molded articles having sufficient heat resistance, rigidity at high temperature and dimensional stability.

Polyamide composition

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Koichi Uchida