Filter and container having microbicidal activity

Patent metadata

Field	Value
Publication number	US-10071175-B2
Application number	US-201514897252-A
Country	US
Kind code	B2
Filing date	Mar 12, 2015
Priority date	Apr 28, 2014
Publication date	Sep 11, 2018
Grant date	Sep 11, 2018

Abstract

A sterilization filter includes a synthetic polymer film, the synthetic polymer film having a surface which has a plurality of first raised portions, a two-dimensional size of the plurality of first raised portions being more than 20 nm and less than 500 μm when viewed in a normal direction. The synthetic polymer film is arranged in a predetermined shape. In the arrangement of the predetermined shape, an inclination of a normal to the surface varies depending on a position over the surface, and an inclination of a normal to a surface opposite to the surface varies depending on a position over the opposite surface. At least part of the surface is capable of coming into contact with a gas or liquid.

First claim

The invention claimed is:

1. A sterilization filter comprising a synthetic polymer film, the synthetic polymer film having a first surface which has a plurality of first raised portions and a second surface opposite to the first surface, a two-dimensional size of the plurality of first raised portions being more than 20 nm and less than 500 nm when viewed in a normal direction of the first surface,
wherein the synthetic polymer film is arranged in a predetermined shape,
in the arrangement of the predetermined shape, a direction normal to the second surface varies depending on a position on the second surface, and
at least part of the first surface is capable of coming into contact with a gas or liquid, and wherein
the synthetic polymer film further has a plurality of second raised portions superimposedly formed over the plurality of first raised portions, and
a two-dimensional size of the plurality of second raised portions is smaller than the two-dimensional size of the plurality of first raised portions and does not exceed 100 nm.

2. The sterilization filter of claim 1 wherein, in the arrangement of the predetermined shape, a cross section of the synthetic polymer film forms at least one ring.

3. The sterilization filter of claim 1 wherein, in the arrangement of the predetermined shape, a cross section of the synthetic polymer film forms a spiral.

4. The sterilization filter of claim 1 , wherein the predetermined shape is a bellows-like shape.

5. The sterilization filter of claim 1 , wherein the first surface further has a plurality of spacer portions.

6. The sterilization filter of claim 5 , wherein a height of the plurality of spacer portions is not less than 1 μm.

7. The sterilization filter of claim 5 , wherein the plurality of spacer portions have a pillar-like shape.

8. The sterilization filter of claim 1 , further comprising a spacer, wherein the spacer is arranged so as to form a space above the first surface of the synthetic polymer film.

9. The sterilization filter of claim 8 , wherein the spacer is in the form of a thread.

10. The sterilization filter of claim 1 , further comprising at least one electrode which is in contact with the synthetic polymer film.

11. The sterilization filter of claim 1 , wherein at least part of the first surface of the synthetic polymer film is positively charged.

12. The sterilization filter of claim 1 , wherein at least part of the second surface of the synthetic polymer film is negatively charged.

13. The sterilization filter of claim 1 , wherein
the predetermined shape is a cylindrical shape,
the synthetic polymer film demarcates a cylinder, and
a plurality of synthetic polymer film pieces are provided in the cylinder, each of the plurality of synthetic polymer film pieces having a surface which has a plurality of third raised portions, a two-dimensional size of the plurality of third raised portions being more than 20 nm and less than 500 nm when viewed in a normal direction of the surface of the synthetic polymer film piece.

14. The sterilization filter of claim 13 , wherein a sum of an area per 1 cm 3 of an inner volume of the cylinder of the first surface of the synthetic polymer film and an area per 1 cm 3 of an inner volume of the cylinder of the surfaces of the plurality of synthetic polymer film pieces is not less than 4.4 cm 2 .

15. The sterilization filter of claim 13 , wherein a static contact angle of the surfaces of the plurality of synthetic polymer film pieces with respect to hexadecane is not more than 51°.

16. The sterilization filter of claim 13 , wherein a static contact angle of the surfaces of the plurality of synthetic polymer film pieces with respect to hexadecane is not more than 31°.

17. The sterilization filter of claim 13 , wherein a static contact angle of the surfaces of the plurality of synthetic polymer film pieces with respect to water is not more than 131°.

18. The sterilization filter of claim 1 , wherein a static contact angle of the first surface of the synthetic polymer film with respect to hexadecane is not more than 51°.

19. The sterilization filter of claim 1 , wherein a static contact angle of the first surface of the synthetic polymer film with respect to hexadecane is not more than 31°.

20. The sterilization filter of claim 1 , wherein a static contact angle of the first surface of the synthetic polymer film with respect to water is not more than 131°.

21. The sterilization filter of claim 1 , wherein the synthetic polymer film has a through hole.

22. The sterilization filter of claim 1 , wherein the plurality of first raised portions include a generally conical portion.

Assignees

• Sharp Kk

Inventors

• Nakahara Takahiro
• Yamada Miho
• Minoura Kiyoshi
• Takami Seiji

Classifications

• A61L2/022

  Filtration · CPC title

• A61L2209/14

  Filtering means · CPC title

• B01D2323/48

  Influencing the pH · CPC title

• B01D71/06

  Organic material · CPC title

• B01D29/31

  Self-supporting filtering elements · CPC title