Ube Industries, Inc.

Asahi Glass Company, Limited

Kuraray Co., Ltd.

Ube Material Industries, Ltd.

Koji Nakamura

Tomoharu Nishioka

Atsushi Funaki

Eiichi Nishi

Kazutoshi Tsuboi

Naoto Nishida

Hiroaki Fujii

Yuji Munesawa

Haruhisa Masuda

Takashi Yamashita

Naoko Sumi

Kozo Tamura

Tetsuya Hara

Noriyuki Isobe

Tsugunori Kashimura

Tsuyoshi Iwasa

Yutaka Yamaguchi

Koichi Warino

Daisuke Douyama

Seiji Yamaguchi

Shigekazu Okamura

Takaaki Kusumoto

Koichi Uchida

Riyousuke Sasaki

Takashi Arase

Yoshio Iwata

Aki Kurumiya

Riyuu Fukuda

Takeru Abe

A multilayer tube is provided which includes a layer including a specific aliphatic polyamide composition and a layer including a semi-aromatic polyamide composition including a semi-aromatic polyamide with a specific structure, these layers being adjacent to each other, wherein the aliphatic polyamide composition includes an aliphatic polyamide having a specific ratio of the number of methylene groups to the number of amide groups, a polyamide having a specific difference in absolute value of solubility parameter SP from the aliphatic polyamide, and an elastomer polymer including a structural unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.

Multilayer tubes

The present invention is a multi-layer tube comprising at least two layers having an (a) layer containing an aliphatic polyamide composition (A) and a (b) layer containing a semi-aromatic polyamide composition (B) containing a specific semi-aromatic polyamide (B1), wherein the aliphatic polyamide composition (A) contains a specific amount of an aliphatic polyamide (A1) and a specific amount of an elastomer polymer (A2) containing an unsaturated compound having a carboxyl group and/or acid anhydride group, and the product of the terminal amino group concentration [X] of the aliphatic polyamide (A1) per g of the aliphatic polyamide composition (A) and the total concentration [Y] of the carboxyl group and acid anhydride group of the elastomer polymer (A2) per g of the aliphatic polyamide composition (A) is a specific amount.

Multi-layer tube

Coated magnesium oxide particles having high filling efficiency and high mass-productivity and suitable for a thermal conductive filler are provided, the coated magnesium oxide particles being coated magnesium oxide particles in which the surface of magnesium oxide particles is coated with at least one of a fatty acid and a fatty acid metal salt, and wherein X in relation to particles is defined as X=[a BET specific surface area diameter calculated from a BET specific surface area of the particles]&#xf7;[Dof the particles], provided that Dis a particle diameter at 50% accumulation in a cumulative particle size distribution of the particles, the magnesium oxide particles having X of less than 0.2 and Dof 5 to 100 &#x3bc;m, and the coated magnesium oxide particles having X of 0.2 or more, Dof 5 to 100 &#x3bc;m, and oil absorption of less than 25 mL/100 g.

Coated magnesium oxide particles and method of producing the same, and thermal conductive resin composition

A magnesium oxide powder has: a median diameter (D) of 5 to 100 &#x3bc;m; a MgO purity of 98% by mass or more; a Ca compound content of 2% by mass or less in terms of CaO; and when the magnesium oxide powder is immersed in pure water and allowed to stand at 95&#xb0; C. for 24 hours, a mass ratio of calcium ions to magnesium ions, Ca/Mg, in an aqueous solution of 10 or less.

Magnesium oxide powder, production method therefor, thermally-conductive resin composition, thermally-conductive grease, and thermally-conductive coating material

A multilayer tube having excellent low temperature impact resistance, breakage pressure strength at high temperature, flexibility, dimensional stability, and elution resistance of low molecular weight substances and ion components. The multilayer tube has a layer containing an aliphatic polyamide composition having a predetermined range of a bending elastic modulus; a layer containing a modified polyolefin has a melting point over a predetermined temperature, and the aliphatic polyamide composition contains an aliphatic polyamide having a predetermined range of a methylene group/amide group number ratio, an elastomer polymer having a constituent unit derived from a carboxyl group and/or acid anhydride group-containing unsaturated compound, and a plasticizer having a certain structure if necessary; and the thickness of the layer containing the aliphatic polyamide composition is a specific ratio or more of the total wall thickness of the tube.

Multilayer tube

It is provided a multilayer tube having a layer containing a specific aliphatic polyamide composition and a layer containing a semi-aromatic polyamide composition which contains a semi-aromatic polyamide having a specific structure or a mixture thereof, and the both layers being disposed adjacent to each other, wherein the aliphatic polyamide composition contains an aliphatic polyamide having a melting point of a specific value or less, and a ratio of the number of the methylene groups to the number of the amide groups is a specific value or more, an aliphatic polyamide having an absolute value of a difference in solubility parameter SP values to that of the aliphatic polyamide being a specific range, and an elastomer polymer containing a constitutional unit derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.

Provided is a multilayer tube that has a layer containing an aliphatic polyamide (such as Polyamide 11 or Polyamide 12), a layer containing a Polyamide 6 composition or Polyamide 6/66/12 composition, a layer containing a saponified ethylene-vinyl acetate copolymer, and a layer containing a semi-aromatic polyamide composition that contains a semi-aromatic polyamide having a specific structure, and further has a fluorine-containing polymer in which a functional group having reactivity with an amino group is introduced into the molecular chain thereof.

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.

A multi-layer structure excellent in the barrier properties against alcohol gasoline, particularly hydrocarbon components, and also excellent in the interlayer adhesion, low-temperature impact resistance, heat resistance and chemical resistance is provided. The stractive is a multi-layer structure comprising two or more layers including at least a layer (a) comprising (A) nylon 11 and/or nylon 12 and a layer (b) comprising (B) a polyamide resin (nylon 9T) consisting of a dicarboxylic acid component and a-diamine component, with 60 to 100 mol % of the dicarboxylic acid component being a terephthalic acid and 60 to 100 mol % of the diamine component being a diamine component selected from 1,9-nonanediamine and 2-methyl-1,8-octanediamine, and preferably further including a layer (c) comprising (A) nylon 11 and/or nylon 12 or (C) nylon 6.

Multi-layer structure

A multi-layer hose having a multi-layer structure comprising an inner layer (I) made of a fluorocopolymer and an outer layer (II) made of a polyamide resin, wherein the fluorocopolymer constituting the inner layer (I) is a fluorocopolymer which comprises polymerized units (a) based on tetrafluoroethylene, polymerized units (b) based on ethylene and polymerized units (c) based on itaconic anhydride and/or citraconic anhydride, wherein the molar ratio of (a)/(b) is from 20/80 to 80/20 and the molar ratio of (c)/((a)+(b)) is from 1/10,000 to 5/100 and which has a volume flow rate of from 1 to 1,000 mm/sec., and the polyamide resin constituting the outer layer (II) is polyamide 11 and/or polyamide 12, which satisfies a condition of (terminal amino group concentration)/(terminal carboxyl group concentration)&#x3e;1.

Multi-layer hose

Polyamide composition

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Ube, Japan

Koji Nakamura