Organic/inorganic composite coating film, structural color film using the same, and preparation methods thereof

• US 8,486,494 B2
• Filed: 03/06/2008
• Issued: 07/16/2013
• Est. Priority Date: 03/14/2007
• Status: Active Grant

• Current Assignee: DIC Corporation, Kawamura Institute Of Chemical Research
• Original Assignee: DIC Corporation, Kawamura Institute Of Chemical Research
• Inventors: Fukazawa, Norimasa, Jin, Ren-Hua
• Primary Examiner(s): SASTRI, SATYA B
• Application Number:
  US12/530,903
• Publication Number:
  US 20100104810A1
• Time in Patent Office: 1,958 Days
• Field of Search: 428/147, 428/304.4, 428/145, 427/385.5
• US Class Current: 427/385.5
• CPC Class Codes: C03C 1/008 for the production of films or coatings
• CPC Class Codes: C03C 17/009 Mixtures of organic and inorganic materials, e.g. ormosils and ormocers
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08L 2205/20 Hollow spheres
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: C09D 7/65 macromolecular C09D7/41-C09D7/48 take precedence
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: C09D 7/68 Particle size between 100-1000 nm
• CPC Class Codes: C09D 7/69 Particle size larger than 1000 nm
• CPC Class Codes: C09D 7/70 characterised by shape, e.g. fibres, flakes or microspheres
• CPC Class Codes: C23C 18/1216 Metal oxides C23C18/1212 takes precedence
• CPC Class Codes: C23C 18/1254 Sol or sol-gel processing
• CPC Class Codes: C23C 18/127 Preformed particles
• CPC Class Codes: C23C 18/1295 with after-treatment of the deposited inorganic material
• CPC Class Codes: Y10T 428/24388 Silicon containing coating
• CPC Class Codes: Y10T 428/24405 Polymer or resin [e.g., natural or synthetic rubber, etc.]
• CPC Class Codes: Y10T 428/249953 Composite having voids in a component [e.g., porous, cellular, etc.]

Abstract

An organic/inorganic composite coating film comprising an inorganic material as a matrix and an organic material combined therewith. The coating film has a regular hollow structure therein, and the coating film surface has a rugged pattern with semispherical protrusions. Also provided is a large-area structural color film obtained by burning the composite coating film. The organic/inorganic composite coating film is obtained by applying an aqueous coating composition comprising a metal alkoxide, an aqueous dispersion of monodisperse polymer particles, and an acid catalyst to a substrate and curing the coating composition. Burning the organic/inorganic composite coating film gives the structural color film.

Claims

1. A method for preparing a structural color film, comprising:

preparing an organic/inorganic composite coating film obtained by the steps of;

applying an aqueous coating composition comprising a metal alkoxide (A), an aqueous dispersion of monodisperse hollow polymer particles (B), and an acid catalyst (C) onto a substrate (X), and

curing the aqueous coating composition;

peeling off the organic/inorganic composite coating film from the substrate (X); and

then calcining the peeled off organic/inorganic composite coating film.

2. The method for preparing the structural color film as described in claim 1, further comprising the step of obtaining the hollow polymer particle (B) by the radical polymerization of a radical polymerizable water soluble monomer (b1) and a radical polymerizable water-insoluble monomer (b2) in an aqueous medium.

3. The method for preparing the structural color film as described in claim 1, wherein the hollow polymer particle (B) is a particle having a shell wall thickness equal to or more than 10 nm and equal to or less than 20 nm, and an average particle diameter equal to or more than 50 nm and less than 150 nm, or a particle having a shell wall thickness equal to or more than 10 nm and equal to or less than 80 nm, and an average particle diameter equal to or more than 150 nm and equal to or less than 800 nm.

4. The method for preparing the structural color film as described in claim 1, wherein the ratio (A)/(B) of the metal alkoxide (A) to the hollow polymer particle (B) to be used, in terms of a mass ratio, is in a range from 30/70 to 95/5.

5. The method for preparing the structural color film as described in claim 2, wherein the ratio (A)/(B) of the metal alkoxide (A) to the hollow polymer particle (B) to be used, in terms of a mass ratio, is in a range from 30/70 to 95/5.

6. The method for preparing the structural color film as described in claim 3, wherein the ratio (A)/(B) of the metal alkoxide (A) to the hollow polymer particle (B) to be used, in terms of a mass ratio, is in a range from 30/70 to 95/5.