MULTILAYER TUBE

WIPO Patent Application WO/2019/159861

A1

The present invention provides a multilayer tube having excellent chemical resistance, low-temperature impact resistance after environmental stress loading, adhesion between layers, and durability while maintaining the characteristics of low-temperature impact resistance and monomer and oligomer elution resistance. The present invention is a multilayer tube in which a layer including an aliphatic polyamide composition and a layer including a vinyl-alcohol-based polymer composition are adjacent, wherein the aliphatic polyamide composition includes an aliphatic polyamide in which the ratio of the number of methylene groups to the number of amide groups is equal to or greater than a specific value, an aliphatic polyamide in which the absolute value of the difference in the solubility parameter SP value thereof with respect to the aforementioned aliphatic polyamide is in a specific range, and an elastomer polymer containing constituent units derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group, and the vinyl-alcohol-based polymer composition includes a vinyl-alcohol-based polymer having specific structural units, and an elastomer polymer containing constituent units derived from an unsaturated compound having a carboxyl group and/or an acid anhydride group.

TSUBOI KAZUTOSHI (JP)
FUJII HIROAKI (JP)
KURUMIYA AKI (JP)
NAKAMURA KOJI (JP)

PCT/JP2019/004778

August 22, 2019

February 12, 2019

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UBE INDUSTRIES (JP)

B32B1/08; B32B27/30; B32B27/34; F16L11/04

WO2017170985A1	2017-10-05
WO2015033982A1	2015-03-12

JP2014240132A	2014-12-25
JP2016069481A	2016-05-09
JP6455649B1	2019-01-23

AKATSUKA Masaki et al. (JP)

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