Antireflection member, transfer member, and method for producing antireflection member

• US 10,451,771 B2
• Filed: 11/04/2015
• Issued: 10/22/2019
• Est. Priority Date: 11/10/2014
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Toyota Motor Corporation)
• Original Assignee: Kabushiki Kaisha Toyota Chuo Kenkyusho (Toyota Motor Corporation)
• Inventors: Mizoshita, Norihiro, Tanaka, Hiromitsu
• Primary Examiner(s): Van Sell, Nathan L
• Application Number:
  US14/932,500
• Publication Number:
  US 20160131802A1
• Time in Patent Office: 1,448 Days
• CPC Class Codes: G02B 1/11 Anti-reflection coatings
• CPC Class Codes: G02B 1/118 having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
• CPC Class Codes: G02B 2207/109 Sols, gels, sol-gel materials

Abstract

An antireflection member, including a resin base member; and a particle layer having mesoporous-silica nanoparticles directly fixed to a surface of the resin base member, wherein the nanoparticles are at least partially embedded in the surface of the resin base member, and the nanoparticles are arranged in a mono-particle layer to form the particle layer.

Claims

1. An antireflection member, comprising:

a resin base member; and

a particle layer comprising mesoporous-silica nanoparticles directly fixed to a surface of the resin base member without any other substance present therebetween, the mesoporous-silica nanoparticles being surface-hydrophobized mesoporous-silica nanoparticles having surfaces to which alkyl groups as hydrophobic groups are introduced,

wherein the nanoparticles are at least partially embedded in the surface of the resin base member,

the nanoparticles are arranged in a mono-particle layer to form the particle layer, and

in the antireflection member, a ratio of an area occupied by the nanoparticles to an entire area of a surface of the antireflection member on which the particle layer is formed is in a range from 40 to 91%.

2. The antireflection member according to claim 1, wherein

the nanoparticles have an average particle diameter of 50 to 300 nm, and

an average value of depths of portions of the nanoparticles embedded in the surface of the resin base member is 5 to 70% of the average particle diameter.

5. A method for producing an antireflection member, comprising the steps of:

embedding mesoporous-silica nanoparticles arranged on a surface of a resin base member at least partially in the surface of the resin base member placed in a flowable polymer state, the mesoporous-silica nanoparticles being surface-hydrophobized mesoporous-silica nanoparticles having surfaces to which alkyl groups as hydrophobic groups are introduced; and

fixing the nanoparticles directly to the surface of the resin base member without any other substance present therebetween by hardening the surface of the resin base member in the flowable polymer state to thereby obtain the antireflection member according to claim 1.

6. The method for producing an antireflection member according to claim 5, further comprising the step of removing mesoporous-silica nanoparticles which have not been fixed to the surface of the resin base member.

7. The method for producing an antireflection member according to claim 5, wherein

the surface of the resin base member is plasticized into the flowable polymer state by subjecting the surface of the resin base member to at least one plasticizing treatment selected from the group consisting of a solvent vapor treatment, a heat treatment, and a gas treatment.

8. The method for producing an antireflection member according to claim 5, wherein

the resin base member comprises a thermosetting resin or a light-curable resin, and

the nanoparticles are arranged on the surface of the resin base member in an unhardened and flowable polymer state, and are at least partially embedded in the surface.

9. A method for producing an antireflection member according to claim 5, further comprising the step of bringing a transfer member into contact with the resin base member to arrange the mesoporous-silica nanoparticles on the surface of the resin base member by transfer, the transfer member comprising:

a release base member; and

mesoporous-silica nanoparticles provisionally fixed to a surface of the release base member in a detachable state, while forming a mono-particle layer, the mesoporous-silica nanoparticles being surface-hydrophobized mesoporous-silica nanoparticles having surfaces to which alkyl groups as hydrophobic groups are introduced.

3. A transfer member, comprising:

a release base member; and

mesoporous-silica nanoparticles provisionally fixed to a surface of the release base member in a detachable state, while forming a mono-particle layer, the mesoporous-silica nanoparticles being surface-hydrophobized mesoporous-silica nanoparticles having surfaces to which alkyl groups as hydrophobic groups are introduced,

wherein, in the transfer member, a ratio of an area occupied by the nanoparticles to an entire area of a surface of the transfer member on which the nanoparticles are provided is in a range from 40 to 91%.

4. The transfer member according to claim 3, wherein

the nanoparticles have an average particle diameter of 50 to 300 nm, and

an average value of depths of portions of the nanoparticles embedded in the surface of the release base member is 2 to 20% of the average particle diameter.