Resin coated metal sheet for container

Patent metadata

Field	Value
Publication number	US-11760065-B2
Application number	US-202017630822-A
Country	US
Kind code	B2
Filing date	Jul 31, 2020
Priority date	Jul 31, 2019
Publication date	Sep 19, 2023
Grant date	Sep 19, 2023

Abstract

A resin coated metal sheet for container includes a polyester resin coating layer in which 90 mol % or more of structural units are ethylene terephthalate units. A half-value width of a peak attributable to C═O stretching vibration around 1,730 cm−1 determined from laser Raman spectroscopic analysis measured by making a plane of polarization of linearly polarized laser light incident on a thickness direction section of the polyester resin coating layer perpendicularly to a thickness direction is 18.5 cm−1 to 22.0 cm−1 at a position with a thickness of 1.0 μm from a metal sheet side of the polyester resin coating layer and is greater than 17.0 cm−1 and 18.5 cm−1 or less at a position with a thickness of 1.0 μm from a surface side of the polyester resin coating layer.

First claim

The invention claimed is:

1. A resin coated metal sheet for a container, the resin coated metal sheet comprising:
a polyester resin coating layer in which 90 mol % or more of structural units are ethylene terephthalate units, the polyester resin coating layer being a biaxially stretched film,
wherein a half-value width of a peak attributable to C=O stretching vibration around 1,730 cm −1 determined from laser Raman spectroscopic analysis measured by making a plane of polarization of linearly polarized laser light incident on a thickness direction section of the polyester resin coating layer perpendicularly to a thickness direction is:
18.5 cm −1 to 22.0 cm −1 at a position with a thickness of 1.0 μm from a metal sheet side of the polyester resin coating layer, and
greater than 17.0 cm −1 and 18.5 cm −1 or less at a position with a thickness of 1.0 μm from a surface side of the polyester resin coating layer.

2. The resin coated metal sheet according to claim 1 , wherein a ratio (I 90° /I 0° ) is 1.8 or more in at least a part of the polyester resin coating layer at a 2.0 μm position from the metal sheet side of the polyester resin coating layer, wherein:
I 90° a peak intensity attributable to C═C stretching vibration around 1,610 cm −1 determined from the laser Raman spectroscopic analysis measured by making the plane of polarization of the linearly polarized laser light incident on the thickness direction section of the polyester resin coating layer perpendicularly to the thickness direction, and
I 0° is a peak intensity determined from Raman spectroscopic analysis measured by making the plane of polarization of the linearly polarized laser light incident on the thickness direction section of the polyester resin coating layer parallel to the thickness direction.

3. The resin coated metal sheet according to claim 2 , wherein the polyester resin coating layer is used on a container outer face side after container forming.

4. The resin coated metal sheet according to claim 1 , wherein the polyester resin coating layer is used on a container outer face side after container forming.

Assignees

• Jfe Steel Corp

Inventors

• Hiraguchi Tomonari
• Kawai Yuya
• Kitagawa Junichi
• Fujimoto Soichi
• Oshima Yasuhide

Classifications

• B32B15/08 Primary

  of synthetic resin · CPC title

• B32B15/09 Primary

  comprising polyesters · CPC title

• B65D25/34

  Coverings or external coatings (of containers made by folding or erecting blanks made of paper B65D5/62; covering or external coating for bottles or jars not otherwise provided for B65D23/08; wrappers B65D65/00) · CPC title

• B65D65/40

  Applications of laminates for particular packaging purposes {(B65D1/0215, B65D1/28, B65D3/22, B65D5/0281, B65D5/563, B65D9/30, B65D29/02, B65D31/02, B65D75/26, B65D77/2024, B65D81/1275, B65D81/3811, B65D81/3823, B65D81/3834, B65D81/3846, B65D81/3858, B65D81/3874, B65D81/3886, B65D81/3897 take precedence; laminates per se or laminated packages characterised by the composition or)} · CPC title

• B32B15/18

  comprising iron or steel {(B32B15/011, B32B15/012 and B32B15/013 take precedence)} · CPC title