Moth-eye film

Patent metadata

Field	Value
Publication number	US-9411158-B2
Application number	US-201314424151-A
Country	US
Kind code	B2
Filing date	Jul 12, 2013
Priority date	Sep 5, 2012
Publication date	Aug 9, 2016
Grant date	Aug 9, 2016

Abstract

The present invention provides a moth-eye film that is not likely to cause condensation on the surface. A moth-eye film including: a resin composition that, when formed into a flat film, has a contact angle with water of larger than 5° but smaller than 31.3°, the contact angle measured between a surface of the flat film and a droplet of water dropped onto the surface of the flat film, after 100 msec from contact of the droplet and the surface.

First claim

The invention claimed is:

1. A moth-eye film comprising:
a cured resin made of a resin composition containing a surfactant and polyethylene glycol, wherein
the surfactant constitutes 0.1% to 10% by mass of the resin composition, and
the resin composition is in the form of a flat film and has a contact angle with water of larger than 5° but 31.3° or smaller, the contact angle being measured between a surface of the flat film formed of the resin composition and a droplet of water dropped onto the surface of the flat film, after 100 msec from contact of the droplet and the surface.

2. The moth-eye film according to claim 1 , wherein the surfactant is a fluorosurfactant.

3. The moth-eye film according to claim 1 , wherein the contact angle is from 9.5° to 11.0° inclusive.

4. The moth-eye film according to claim 1 ,
wherein the moth-eye film shows a value calculated by subtracting a first contact diameter from a second contact diameter of smaller than 0, the first contact diameter being a contact diameter after 60 seconds from dropping of a 0.2 to 1.0 μl of a water droplet on the surface, the second contact diameter being a contact diameter after 120 seconds from dropping of the droplet on the surface.

5. The moth-eye film according to claim 1 , wherein the surfactant is a silicone surfactant.

6. The moth-eye film according to claim 1 , wherein the resin composition further contains urethane methacrylate.

7. The moth-eye film according to claim 1 , wherein the resin composition further contains urethane methacrylate and ester methacrylate.

Assignees

• Sharp Kk

Inventors

• Minoura Kiyoshi
• Isurugi Akinobu
• Teranishi Tomoko
• Satoh Eiji

Classifications

• E06B7/12

  Measures preventing the formation of condensed water (double glazing E06B3/24 - E06B3/28 {and E06B3/677} ; heating arrangements specially adapted for transparent or reflecting areas H05B3/84) · CPC title

• G02B1/118

  having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures · CPC title

• G02B1/04

  made of organic materials, e.g. plastics (G02B1/08 takes precedence) · CPC title

• G02B27/0006 Primary

  with means to keep optical surfaces clean, e.g. by preventing or removing dirt, stains, contamination, condensation (G02B1/18 takes precedence; cleaning in general B08B) · CPC title

• C08L2203/16

  used for films · CPC title