Thermoplastic resin film, metal plate coated with thermoplastic resin, and metal container coated with thermoplastic resin

Patent metadata

Field	Value
Publication number	US-11655364-B2
Application number	US-201917057960-A
Country	US
Kind code	B2
Filing date	May 21, 2019
Priority date	May 23, 2018
Publication date	May 23, 2023
Grant date	May 23, 2023

Abstract

[Problem]To provide a thermoplastic resin film excellent in impact resistance, formability and trimmability when forming a container, productivity, and the like, and a thermoplastic resin-coated metal sheet.[Solution]A thermoplastic resin film contains 70 to 97 wt % of a thermoplastic polyester resin component and 3 to 30 wt % of a polyolefin resin component. The polyolefin resin component contains one or more polyolefin resins selected from the group consisting of nonpolar polyolefin resins and polyolefin resins having ester-containing functional groups in side chains thereof. The polyolefin resin component is dispersed, in the thermoplastic polyester resin component, in a fibrous form having an average length of 5 to 300 μm in a machine direction of the film, an average length of 0.2 to 5 μm in a thickness direction of the film, and an aspect ratio of 8 or greater.

First claim

The invention claimed is:

1. A thermoplastic resin-coated metal sheet comprising:
a metal sheet and a thermoplastic resin film laminated on at least one side of the metal sheet,
wherein the thermoplastic resin film contains 70 to 97 wt % of a thermoplastic polyester resin component and 3 to 30 wt % of a polyolefin resin component,
wherein the polyolefin resin component contains one or more polyolefin resins selected from a group consisting of nonpolar polyolefin resins and polyolefin resins having ester-containing functional groups in side chains of the groups,
wherein the polyolefin resin component is dispersed, in the thermoplastic polyester resin component, in a fibrous form having an average length of 5 to 300 μm in a machine direction of the film, an average length of 0.2 to 5 μm in a thickness direction of the film, and an aspect ratio of 8 or greater, and
wherein the aspect ratio is defined as “a/b”, with “a” representing the average length in the machine direction of the film, and “b” representing the average length in the thickness direction of the film.

2. The thermoplastic resin-coated metal sheet according to claim 1 , wherein the nonpolar polyolefin resins are any of polyethylene, polypropylene, and ethylene-propylene copolymer.

3. The thermoplastic resin-coated metal sheet according to claim 1 , wherein the polyolefin resins having the ester-containing functional groups in the side chains of the groups are any of ethylene-methyl methacrylate copolymer, ethylene-ethyl acrylate copolymer, and ethylene-methyl acrylate copolymer.

4. The thermoplastic resin-coated metal sheet according to claim 1 , wherein the thermoplastic polyester resin contains one or more of polyethylene terephthalate (PET), polyethylene terephthalate/isophthalate copolymer (PET/IA), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN).

5. The thermoplastic resin-coated metal sheet according to claim 1 , further comprising:
on at least one side of the thermoplastic resin film, a thermoplastic polyester resin layer of a kind different from the thermoplastic resin film.

6. A thermoplastic resin-coated metal container comprising:
a thermoplastic resin layer on a side of at least an inner wall of the container,
wherein the thermoplastic resin layer contains 70 to 97 wt % of a thermoplastic polyester resin component and 3 to 30 wt % of a polyolefin resin component,
wherein the polyolefin resin component includes one or more polyolefin resins selected from a group consisting of nonpolar polyolefin resins and polyolefin resins having ester-containing functional groups in side chains of the groups,
wherein the polyolefin resin component is dispersed, in the thermoplastic polyester resin component, in a fibrous form having an average length of 5 to 300 μm in a machine direction of the film, an average length of 0.2 to 5 μm in a thickness direction of the film, and an aspect ratio of 8 or greater, and
wherein the aspect ratio is defined as “a/b”, with “a” representing the average length in the machine direction of the film, and “b” representing the average length in the thickness direction of the film.

7. The thermoplastic resin-coated metal container according to claim 6 , wherein at least a portion of the polyolefin resin component is dispersed in a particulate form having an average particle size of 2 to 10 μm and an aspect ratio of 1 to 3 in the thermoplastic polyester resin component, and wherein the average particle size is defined as “(a+b)/2”.

Assignees

• Toyo Kohan Co Ltd
• Toyo Seikan Co Ltd

Inventors

• Takenaga Tomoyasu
• Nishida Kazuhiro
• Kawamura Satoshi
• Sasaki Kousuke
• Hiromori Shuhei
• Yanada Kenji
• Aihara Mitsuhide

Classifications

• B32B2605/00

  Vehicles · CPC title

• B32B27/20

  using fillers, pigments, thixotroping agents · CPC title

• B32B27/18

  characterised by the use of special additives · CPC title

• B32B2262/0207

  Elastomeric fibres · CPC title

• B32B2250/03

  3 layers · CPC title