Multilayer structure

Patent metadata

Field	Value
Publication number	US-2016207292-A1
Application number	US-201414914086-A
Country	US
Kind code	A1
Filing date	Jun 26, 2014
Priority date	Aug 29, 2013
Publication date	Jul 21, 2016
Grant date	—

Abstract

A multilayer structure including a polyolefin layer (A) and a polyamide resin composition layer (B), wherein the polyamide resin composition constituting the layer (B) contains a polyamide resin (b-1) in which a diamine constituent unit thereof contains a constituent unit derived from a xylylenediamine and a dicarboxylic acid constituent unit thereof contains a constituent unit derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms and a modified polyolefin (b-2), and the content of the modified polyolefin (b-2) is from 5 to 30 parts by mass relative to 100 parts by mass of the polyamide resin (b-1).

First claim

1 . A multilayer structure including a polyolefin layer (A) and a polyamide resin composition layer (B), wherein:
the polyamide resin composition constituting the layer (B) comprises a polyamide resin (b-1) in which a diamine constituent unit thereof comprises a constituent unit derived from a xylylenediamine and a dicarboxylic acid constituent unit thereof comprises a constituent unit derived from an α,ω-linear aliphatic dicarboxylic acid having from 4 to 20 carbon atoms and a modified polyolefin (b-2); and the content of the modified polyolefin (b-2) is from 5 to 30 parts by mass relative to 100 parts by mass of the polyamide resin (b-1).

2 . The multilayer structure according to claim 1 , wherein the modified polyolefin (b-2) is a polyolefin modified with a carboxyl group-containing monomer, or a polyolefin graft-modified with a polyamide.

3 . The multilayer structure according to claim 2 , wherein the polyolefin modified with a carboxyl group-containing monomer is a maleic anhydride-modified polyethylene.

4 . The multilayer structure according to claim 2 , wherein the polyamide for graft formation is at least one selected from the group consisting of nylon 6, nylon 66, nylon 11, nylon 12, nylon 612 and copolymers thereof.

5 . The multilayer structure according to claim 1 , wherein the degree of modification of the modified polyolefin (b-2) is from 0.2 to 5% by mass.

6 . The multilayer structure according to claim 1 , wherein the density of the modified polyolefin (b-2) is 0.85 g/cm 3 or more.

7 . The multilayer structure according to claim 1 , wherein the weight-average molecular weight of the modified polyolefin (b-2) is from 10,000 to 150,000.

8 . The multilayer structure according to claim 1 , having one layer or two or more layers of each of the polyolefin layer (A) and the polyamide resin composition layer (B).

9 . The multilayer structure according to claim 1 , wherein the polyamide resin (b-1) is a polyamide in which the diamine constituent unit contains a constituent unit derived from metaxylylenediamine, and the dicarboxylic acid constituent unit contains a constituent unit derived from sebacic acid.

10 . The multilayer structure according to claim 1 , wherein the multilayer structure is a cylindrical molded body.

11 . The multilayer structure according to claim 10 , comprising at least a layer configuration in an order of the polyolefin layer (A) and the polyamide resin composition layer (B) from the inside.

12 . The multilayer structure according to claim 10 , wherein the ratio of the thickness of the polyamide resin composition layer (B) to the thickness of the cylindrical molded body is from 0.005 to 0.5.

13 . The multilayer structure according to claim 10 , which is for water service piping.

Assignees

• Mitsubishi Gas Chemical Co

Inventors

• Sato Kazuya
• Kato Tomonori
• Mitadera Jun

Classifications

• B32B27/08 Primary

  of synthetic resin · CPC title

• B32B2307/714

  Inert, i.e. inert to chemical degradation, corrosion · CPC title

• B32B2597/00

  Tubular articles, e.g. hoses, pipes · CPC title

• B32B2307/7265

  Non-permeable · CPC title

• B32B27/34

  comprising polyamides · CPC title