Laminate

Patent metadata

Field	Value
Publication number	US-11613110-B2
Application number	US-202117226257-A
Country	US
Kind code	B2
Filing date	Apr 9, 2021
Priority date	Dec 5, 2018
Publication date	Mar 28, 2023
Grant date	Mar 28, 2023

Abstract

A laminate, containing two or more polyolefin resin layers,
wherein at least one polyolefin resin layer (A) contains a cellulose fiber including a cellulose fiber having a fiber length of 0.3 mm or more dispersed in the layer; a content of the cellulose fiber in the polyolefin resin layer (A) is 1% by mass or more and less than 60% by mass; and wherein a polyolefin resin layer (B) different from the polyolefin resin layer (A) is laminated in contact with the polyolefin resin layer (A).

First claim

The invention claimed is:

1. A laminate, comprising two or more polyolefin resin layers,
wherein at least one polyolefin resin layer (A) comprises a cellulose fiber including a cellulose fiber having a fiber length of 0.3 mm to 10 mm dispersed in the layer; a content of the cellulose fiber in the polyolefin resin layer (A) is 1% by mass or more and less than 60% by mass;
wherein a polyolefin resin layer (B) different from the polyolefin resin layer (A) is laminated in contact with the polyolefin resin layer (A); and
wherein at least one of a polyolefin constituting the polyolefin resin layer (A) and a polyolefin constituting the polyolefin resin layer (B) consists of polyethylene.

2. The laminate according to claim 1 , wherein the polyolefin resin layer (A) comprises dispersed aluminum.

3. The laminate according to claim 2 , wherein the aluminum has a flake structure and/or an irregular folded structure of a thin film.

4. The laminate according to claim 1 , which has a linear expansion coefficient of 1×10 −4 /° C. or less in a temperature range of 20 to 30° C. in a direction perpendicular to a laminate direction of the laminate.

5. The laminate according to claim 1 , wherein a polyolefin constituting the polyolefin resin layer (A) comprises a low density polyethylene and/or a polyolefin having a melting point of 100 to 127° C.

6. The laminate according to claim 1 , wherein a polyolefin resin constituting the polyolefin resin layer (B) comprises a high density polyethylene resin.

7. The laminate according to claim 1 , wherein the polyolefin resin layer (B) comprises an inorganic material.

8. The laminate according to claim 7 , wherein a ratio of a linear expansion coefficient in a temperature range of 20 to 30° C. of the polyolefin resin layer (B) to a linear expansion coefficient in a temperature range of 20 to 30° C. of the polyolefin resin layer (A) is 1/3 to 3/1.

9. The laminate according to claim 1 , wherein the polyolefin resin layer (A) comprises at least one type of compound selected from a metal salt of organic acid, organic acid, and silicone.

10. The laminate according to claim 1 , wherein the polyolefin resin layer (A) comprises an inorganic material.

11. The laminate according to claim 1 , comprising the polyolefin resin layers (B) on both surfaces of the polyolefin resin layer (A), the polyolefin resin layers (B) being in contact with the polyolefin resin layer (A).

12. The laminate according to claim 1 ,
wherein the laminate is an annular structure; and
wherein the laminate comprises the polyolefin resin layer (B) on an outer circumference and/or an inner circumference of the polyolefin resin layer (A) having an annular shape, the polyolefin resin layer (B) being in contact with the polyolefin resin layer (A).

13. The laminate according to claim 11 ,
wherein the laminate is an annular structure; and
wherein the laminate comprises the polyolefin resin layers (B) on an outer circumference and an inner circumference of the polyolefin resin layer (A) having an annular shape, the polyolefin resin layers (B) being in contact with the polyolefin resin layer (A).

14. The laminate according to claim 1 ,
wherein the laminate is an annular structure;
wherein the laminate comprises the polyolefin resin layer (B) on at least an outer circumference of the polyolefin resin layer (A) having an annular shape, the polyolefin resin layer (B) being in contact with the polyolefin resin layer (A); and
wherein the polyolefin resin layer (B) comprises at least one type of carbon black, a photostabilizer, and an inorganic powder having a refractive index of 2 or more.

15. The laminate according to claim 12 , wherein the laminate having an annular structure is a corrugated tube which is corrugated in a longitudinal direction.

16. The laminate according to claim 1 , wherein the laminate is an extrusion molded body or a blow molded body.

17. The laminate according to claim 1 ,
wherein the polyolefin resin layer (A) has a cross section of a foam having a foam diameter of 10 μm or more in cross-sectional observation of the polyolefin resin layer (A); and wherein a proportion of a total area of the cross section of the foam in an area of an observed cross section is 5 to 70%.

18. The laminate according to claim 1 , wherein a length weighted average fiber length of the cellulose fiber contained in the polyolefin resin layer (A) is 300 to 10,000 μm.

19. The laminate according to claim 1 , which is used as a member for civil engineering, a building material, or an automobile.

Assignees

• Furukawa Electric Co Ltd

Inventors

• Tazuke Masami
• Suzuki Toshihiro
• Hara Hidekazu
• Hiroishi Jirou
• Kim Jae Kyung
• Ikeuchi Masato
• Sakato Jiro

Classifications

• B29C49/22

  using multilayered preforms or parisons · CPC title

• B29C49/04

  Extrusion blow-moulding · CPC title

• B29C49/0005

  characterised by the material · CPC title

• C08L2205/16

  Fibres; Fibrils · CPC title

• B32B2262/062

  Cellulose fibres, e.g. cotton · CPC title