Polyethylene-based structure

Patent metadata

Field	Value
Publication number	US-9296881-B2
Application number	US-201214003624-A
Country	US
Kind code	B2
Filing date	Mar 7, 2012
Priority date	Mar 8, 2011
Publication date	Mar 29, 2016
Grant date	Mar 29, 2016

Abstract

The present invention provides a polyethylene-based structure including from 60 to 90% by mass of a polyethylene (A), from 5 to 35% by mass of an acid-modified polyethylene (B) and from 5 to 35% by mass of a m-xylylene group-containing polyamide (C), in which the m-xylylene group-containing polyamide (C) is dispersed in a layer form in the polyethylene (A) to partially form a continuous phase thereof, and has a relative viscosity of from 2.5 to 4.5.

First claim

The invention claimed is:

1. A polyethylene-based structure, comprising:
(A) from 60 to 90% by mass of a polyethylene (A);
(B) from 5 to 35% by mass of an acid-modified polyethylene (B); and
(C) from 5 to 35% by mass of a m-xylylene group-containing polyamide (C),
wherein:
the m-xylylene group-containing polyamide (C) is dispersed in a layer form in the polyethylene (A),
the m-xylylene group-containing polyamide (C) has a relative viscosity of from 2.5 to 4.5; and
the polyethylene-based structure satisfies the following Requirement 1 or 2:
(Requirement 1):
(1-1): the polyethylene (A) is a high-density polyethylene (Aa) having a density of from 0.94 to 0.97 and a melt flow rate (MFR) of from 0.1 to 0.6, and
(1-2): the acid-modified polyethylene (B) has a density of from 0.90 to 0.935 and a melt flow rate (MFR) that is in the range of from 3 to 10 times the MFR of the high-density polyethylene (Aa); or

(Requirement 2):
the polyethylene (A) is in the form of a mixture of a polyethylene (A1) having a density of from 0.935 to 0.965 and a polyethylene (A2) having a density of from 0.91 to 0.93, and a mass ratio of the polyethylene (A1) to the polyethylene (A2) ((A1)/(A2)) is from 70/30 to 95/5.

2. The polyethylene-based structure according to claim 1 , wherein the polyethylene-based structure satisfies the Requirement 1.

3. The polyethylene-based structure according to claim 2 , wherein the m-xylylene group-containing polyamide (C) comprises components having a number-average molecular weight of 1,000 or less in an amount of 2% by mass or less.

4. The polyethylene-based structure according to claim 1 , comprising:
from 60 to 90% by mass of the polyethylene (A);
from 5 to 25% by mass of the acid-modified polyethylene (B); and
from 5 to 35% by mass of the m-xylylene group-containing polyamide (C),

wherein the polyethylene-based structure satisfies the Requirement 2.

5. The polyethylene-based structure according to claim 4 , wherein the acid-modified polyethylene (B) has a density of from 0.90 to 0.935.

6. The polyethylene-based structure according to claim 4 , wherein the polyethylene (A1) has a melt flow rate (MFR) of from 0.05 to 0.6.

7. The polyethylene-based structure according to claim 4 , wherein the polyethylene (A2) has a melt flow rate (MFR) that is in the range of from 0.5 to 8 times the MFR of the polyethylene (A1).

8. The polyethylene-based structure according to claim 4 , wherein the acid-modified polyethylene (B) has a melt flow rate (MFR) that is in the range of from 3 to 10 times the MFR of the polyethylene (A1).

9. The polyethylene-based structure according to claim 1 , wherein the m-xylylene group-containing polyamide (C) comprises a m-xylylenediamine unit in an amount of 70 mol % or more.

10. The polyethylene-based structure according to claim 1 , wherein the polyethylene-based structure is in the form of a tank, a pipe or a bottle.

11. The polyethylene-based structure according to claim 1 , wherein the polyethylene-based structure is formed by a direct blow method.

12. The polyethylene-based structure according to claim 5 , wherein the polyethylene (A1) has a melt flow rate (MFR) of from 0.05 to 0.6.

13. The polyethylene-based structure according to claim 5 , wherein the polyethylene (A2) has a melt flow rate (MFR) that is in the range of from 0.5 to 8 times the MFR of the polyethylene (A1).

14. The polyethylene-based structure according to claim 6 , wherein the polyethylene (A2) has a melt flow rate (MFR) that is in the range of from 0.5 to 8 times the MFR of the polyethylene (A1).

15. The polyethylene-based structure according to claim 5 , wherein the acid-modified polyethylene (B) has a melt flow rate (MFR) that is in the range of from 3 to 10 times the MFR of the polyethylene (A1).

16. The polyethylene-based structure according to claim 6 , wherein the acid-modified polyethylene (B) has a melt flow rate (MFR) that is in the range of from 3 to 10 times the MFR of the polyethylene (A1).

17. The polyethylene-based structure according to claim 1 ,
wherein some layers of the m-xylylene group-containing polyamide (C) converge with each other in the polyethylene (A).

18. The polyethylene-based structure according to claim 1 ,
wherein the polyethylene-based structure satisfies the Requirement 2.

Assignees

• Otaki Ryoji
• Kouno Kenji
• Mitsubishi Gas Chemical Co

Inventors

• Otaki Ryoji
• Kouno Kenji

Classifications

• Y10T428/1397

  Single layer [continuous layer] · CPC title

• C08L23/06 Primary

  Polyethylene · CPC title

• C08L77/06

  Polyamides derived from polyamines and polycarboxylic acids (C08L77/10 takes precedence) · CPC title

• C08L2205/02

  containing two or more polymers of the same C08L -group · CPC title

• C08L2205/025

  containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure · CPC title