COATING FORMULATION AFFORDING ANTIREFLECTION EFFECTS ON TRANSPARENT SUBSTRATE AND METHOD FOR MANUFACTURING TRANSPARENT SUBSTRATE WITH ANTIREFLECTION FUNCTION USING SAID COATING FORMULATION

• US 20110177241A1
• Filed: 07/27/2009
• Published: 07/21/2011
• Est. Priority Date: 08/11/2008
• Status: Abandoned Application

• Current Assignee: Ecopera, Inc.
• Original Assignee: Ecopera, Inc.
• Inventors: Lee, Kyu Wang, Kim, Young Min
• Application Number:
  US13/056,597
• Publication Number:
  US 20110177241A1
• Time in Patent Office: Days
• US Class Current: 427/165
• CPC Class Codes: C03C 17/006 with materials of composite character
• CPC Class Codes: C03C 2217/42 consisting of particles only
• CPC Class Codes: C03C 2217/732 made of a single layer
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: C09D 5/006 Anti-reflective coatings

Abstract

The present invention provides a method for preparing a glass substrate with antireflection functionality by applying a coating formulation that affords antireflection effects to a substrate comprising water, metalloid oxide nano particles that are dispersed in said water, and a hydroxide ion agent or fluoride ion agent that is introduced into said metalloid oxide nano particles at a mole ratio of 0.005˜2:1. The coating formulation of the present invention enables manufacture of a porous nano antireflection film with high transmittance following a more streamlined process than the prior art, obtaining an antireflection film with a high adhesive force between the film and substrate, and high durability by increasing particle-particle bonding and the bond strength between particles and substrate.

Claims

1. A coating formulation affording antireflection effects on a transparent substrate, comprising:

water;

metalloid oxide nano particles that are dispersed in said water; and

a hydroxide ion agent or fluoride ion agent that is introduced into said metalloid oxide nano particles at a mole ratio of 0.005˜

2;

1.

2. A coating formulation affording antireflection effects on a transparent to substrate of claim 1, wherein said metalloid oxide nano particle is selected from the group consisting of silica, alumina, titania, magnesia, seria, zinc oxide, indium oxide, tin oxide and a mixture of the same, and said transparent substrate is metalloid oxide selected from the group consisting of silica, alumina, titania, magnesia, seria, zinc oxide, indium oxide, tin oxide and a mixture of the same, glass or a substrate coated with the same.

3. A coating formulation affording antireflection effects on a transparent substrate of claim 2, wherein said metalloid oxide nano particle is a silica nano particle, and said transparent substrate is glass.

4. A coating formulation affording antireflection effects on a transparent substrate of claim 1, wherein said coating formulation further contains methanol or ethanol as a surface tension inhibitor by 10 weight %˜

90 weight % of the entire coating formulations.

5. A coating formulation affording antireflection effects on a transparent substrate of claim 1, wherein said coating formulation is applied to a glass substrate within 30 days after a hydroxide ion agent or fluoride ion agent is introduced.

6. A coating formulation affording antireflection effects on a transparent substrate of claim 1, wherein the nano silica in said coating formulation is 1˜

10 weight % with respect to the total weights of the coating formulation, and said nano silica has a particle size of 5˜

100 nm.

7. A coating formulation affording antireflection effects on a transparent is substrate of claim 5, wherein a hydroxide ion agent in said coating formulation is NH₄OH, and a mole ratio of [OH⁻

]/[SiO₂] is 0.05 to 2

8. A coating formulation affording antireflection effects on a transparent substrate of claim 5, wherein a fluoride ion agent is HF, H₂SiF₆ or its salt, and a mole ratio of [F⁻

, HF⁻

₂]/[SiO₂] is 0.005 to 1.0.

9. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation, comprising:

a step for washing a surface of a transparent substrate;

a step for coating on a surface of the washed transparent substrate a formulation formed of water;

metalloid oxide nano particles that are dispersed in said water; and

a hydroxide ion agent or fluoride ion agent that is introduced into said metalloid oxide nano particles at a mole ratio of 0.005˜

2;

1; and

a step for drying the coated surface.

10. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation of claim 9, wherein said metalloid oxide nano particle is selected from the group consisting of silica, alumina, titania, magnesia, seria, zinc oxide, indium oxide, tin oxide and a mixture of the same, and said transparent substrate is metalloid oxide selected from the group consisting of silica, alumina, titania, magnesia, seria, zinc oxide, is indium oxide, tin oxide and a mixture of the same, glass or a substrate coated with the same.

11. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation of claim 9, wherein said metalloid oxide nano particle is a silica nano particle, and said transparent substrate is glass.

12. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation of claim 9, further comprising a step for coating perfluoro alkyl (alkoxy) silane, perfluoropolyether or a derivate of the same.

13. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation of claim 10, wherein said coating formulation is applied to a glass substrate within 30 days after a hydroxide ion agent or fluoride ion agent is introduced.

14. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation of claim 11, wherein the nano silica in said coating formulation is 1˜

10 weight % with respect to the total weights of the coating formulation, and said nano silica has a particle size of 5˜

100 nm, and hydroxide ion agent is NH₄OH, and a mole ratio of [OH⁻

]/[SiO₂] is 0.5 to 1.2.

15. A method for manufacturing a transparent substrate with an antireflection function using the coating formulation of claim 12, wherein the nano silica in said coating formulation is 1˜

10 weight % with respect to the total weights of the coating formulation, and said nano silica has a particle size of 5˜

100 nm, and fluoride ion agent is HF, H₂SiF₆ or its salt, and a mole ratio of [F⁻

, HF⁻

₂]/[SiO₂] is 0.005 to 1.0.