Plastic molded body

Patent metadata

Field	Value
Publication number	US-10737835-B2
Application number	US-201515518090-A
Country	US
Kind code	B2
Filing date	Oct 8, 2015
Priority date	Oct 29, 2014
Publication date	Aug 11, 2020
Grant date	Aug 11, 2020

Abstract

A plastic molded body has a surface including a non-fluororesin and a rough surface formed on the surface, in which a fluorine atom is incorporated into the molecular chain of a non-fluororesin forming the rough surface. The molded body maintains excellent liquid repellency for a long period of time and exhibits the same levels of drainage and liquid drop-off properties as the initial levels even when it is brought into contact with a liquid repeatedly.

First claim

The invention claimed is:

1. A packaging material having the form of a bottle, cap or spout to contain a liquid substance, wherein:
the packaging material having said form has a surface that comes in contact with said liquid substance, said surface being a non-fluororesin surface comprising a polyolefin or a polyester;
said non-fluororesin surface is at least partly a rough surface that has a primary irregular surface; and
a fluorine atom is bonded to a molecular chain of the non-fluororesin forming said rough surface by etching the non-fluororesin surface with a fluorine plasma.

2. The packaging material according to claim 1 , wherein the rough surface has the primary irregular surface ( 1 ) and a secondary irregular surface ( 2 ) which is finer than the primary irregular surface ( 1 ) and which is formed within the primary irregular surface ( 1 ), and
a fluorine atom is bonded to a molecular chain at the non-fluororesin forming the secondary irregular surface.

3. The packaging material according to claim 2 , wherein a much finer tertiary irregular surface ( 3 ) is formed within the secondary irregular surface ( 2 ), and
a fluorine atom is bonded to a molecular chain at the non-fluororesin forming the tertiary irregular surface.

4. The packaging material according to claim 1 , wherein when a droplet is dropped on the rough surface, an area ratio ϕ s represented by a projection area of a solid-liquid interface per unit area is 0.05 to 0.8.

5. The packaging material according to claim 1 , wherein the rough surface has a rectangular irregular structure.

6. The packaging material according to claim 1 , wherein when an arithmetic average roughness corresponding to an amplitude of an irregular structure forming the rough surface is represented by Ra and an average length of a 1/2 pitch (R 0 ) of an irregular structure is represented by RSm, the rough surface (ii) satisfies Ra/RSm≥50×10 −3 .

7. The packaging material according to claim 1 which is adapted to discharge a liquid substance.

Assignees

• Toyo Seikan Group Holdings Ltd

Inventors

• Iwasaki Tsutomu
• Aoya Masaki
• Kimura Satoo

Classifications

• B29C59/022 Primary

  characterised by the disposition or the configuration, e.g. dimensions, of the embossments or the shaping tools therefor · CPC title

• B65D47/0838

  located at an edge of the base element · CPC title

• B29C59/14

  by plasma treatment {(plasma tubes per se H01J)} · CPC title

• B29K2023/0633

  LDPE, i.e. low density polyethylene · CPC title

• B65D47/40

  with drip catchers or drip-preventing means · CPC title