# US 2020/0399502 A1 · Film, liquid composition, optical element, and imaging apparatus

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- Number: US 2020/0399502 A1
- Document ID: US20200399502A1
- Status: Published application
- Kind: A1
- Application number: 16/969,478
- Filed: 2018-11-08
- Published: 2020-12-24
- Earliest claimed: 2018-02-13
- Assignees: Nippon Sheet Glass Co., Ltd.
- Applicants: Nippon Sheet Glass Company, Limited
- Inventors: Koichiro NAKAMURA; Satoru KUSAKA
- Web page: https://patentgrep.com/patent/US20200399502A1

## CPC

- C09D 183/04: Polysiloxanes
- C08K 3/16: Halogen-containing compounds
- C08K 7/26: Silicon- containing compounds
- C09D 5/006: {Anti-reflective coatings}
- C09D 7/61: inorganic
- G02B 1/111: using layers comprising organic materials
- G02B 1/118: having sub-optical wavelength surface structures designed to provide an enhanced transmittance, e.g. moth-eye structures
- G02B 1/18: Coatings for keeping optical surfaces clean, e.g. hydrophobic or photo-catalytic films (G02B1/16 takes precedence)
- C08K 7/24: inorganic
- C08K 2003/166: {Magnesium halide, e.g. magnesium chloride}
- C08K 2201/003: Additives being defined by their diameter
- C08K 2201/011: Nanostructured additives
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A film (1) includes hollow particles (10) and a binder (20). The hollow particles are made of a material having a refractive index of 1.15 to 2.70. The binder (20) is formed of at least a polysilsesquioxane and binds the hollow particles (10). The film (1) satisfies at least one of requirements Ib/Ia≥0.7 and Ib/Ic≥0.3. Ia is an absorbance derived from a hydrocarbon group not directly bonded to a silicon atom, the absorbance being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer. Ib is an absorbance derived from a bond between a silicon atom and a non-reactive functional group. Ic is an absorbance derived from a bond between a silicon atom and a hydroxy group.

## Claims

### Claim 1

A film comprising:
hollow particles made of a material having a refractive index of 1.15 to 2.70; and
a binder formed of at least a polysilsesquioxane and binding the hollow particles, wherein
at least one of requirements Ib/Ia≥0.7 and Ib/Ic≥0.3 are satisfied when an absorbance derived from a hydrocarbon group not directly bonded to a silicon atom, an absorbance derived from a bond between a silicon atom and a non-reactive functional group, and an absorbance derived from a bond between a silicon atom and a hydroxy group are respectively expressed as Ia, Ib, and Ic, the absorbances being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer.

### Claim 2 (depends on 1)

The film according to claim 1, the requirements Ib/Ia≥0.7 and Ib/Ic≥0.3 are further satisfied.

### Claim 3 (depends on 1)

The film according to claim 1, wherein
at least one of requirements Id/Ib≤60, Ie/Ib≤20, and If/Ib≤174 are further satisfied when a first absorbance, a second absorbance, and a third absorbance derived from a bond between one oxygen atom and two silicon atoms and determined by the attenuated total reflection are respectively expressed as Id, Ie, and If,
the first absorbance Id corresponds to a first wavenumber,
the second absorbance Ie corresponds to a second wavenumber greater than the first wavenumber, and
the third absorbance If corresponds to a third wavenumber greater than the second wavenumber.

### Claim 4 (depends on 3)

The film according to claim 3, wherein the requirements Id/Ib≤60, Ie/Ib≤20, and If/Ib≤174 are further satisfied.

### Claim 5 (depends on 1)

The film according to claim 1, wherein the polysilsesquioxane is a polysilsesquioxane in which a hydrocarbon group including 16 or less carbon atoms is bonded as the non-reactive functional group to a silicon atom.

### Claim 6 (depends on 1)

The film according to claim 1, wherein the hollow particles have an average particle diameter of 10 to 150 nm.

### Claim 7 (depends on 1)

The film according to claim 1, wherein the hollow particles are made of at least one selected from the group consisting of silica, magnesium fluoride, alumina, aluminosilicate, titania, and zirconia.

### Claim 8 (depends on 1)

The film according to claim 1, having a refractive index of 1.35 or less.

### Claim 9

A liquid composition, comprising:
hollow particles made of a material having a refractive index of 1.15 to 2.70;
a polysilsesquioxane; and
a solvent, wherein
in a hardened product obtained by applying the liquid composition to a substrate and hardening the liquid composition, at least one of requirements Ib/Ia≥0.7 and Ib/Ic≥0.3 are satisfied when an absorbance derived from a hydrocarbon group not directly bonded to a silicon atom, an absorbance derived from a bond between a silicon atom and a non-reactive functional group, and an absorbance derived from a bond between a silicon atom and a hydroxy group are respectively expressed as Ia, Ib, and Ic, the absorbances being determined by attenuated total reflection using a Fourier transform infrared spectrophotometer.

### Claim 10 (depends on 9)

The liquid composition according to claim 9, wherein the requirements Ib/Ia≥0.7 and Ib/Ic≥0.3 are further satisfied in the hardened product.

### Claim 11 (depends on 9)

The liquid composition according to claim 9, wherein in the hardened product, at least one of requirements Id/Ib≤60, Ie/Ib≤20, and If/Ib≤174 are further satisfied when a first absorbance, a second absorbance, and a third absorbance derived from a bond between one oxygen atom and two silicon atoms and determined by the attenuated total reflection are respectively expressed as Id, Ie, and If,
the first absorbance Id corresponds to a first wavenumber,
the second absorbance Ie corresponds to a second wavenumber greater than the first wavenumber, and
the third absorbance If corresponds to a third wavenumber greater than the second wavenumber.

### Claim 12 (depends on 11)

The liquid composition according to claim 11, wherein the requirements Id/Ib≤60, Ie/Ib≤20, and If/Ib≤174 are further satisfied in the hardened product.

### Claim 13 (depends on 9)

The liquid composition according to claim 9, wherein the polysilsesquioxane is a polysilsesquioxane in which a hydrocarbon group including 16 or less carbon atoms is bonded as the non-reactive functional group to a silicon atom.

### Claim 14 (depends on 9)

The liquid composition according to claim 9, wherein the hollow particles have an average particle diameter of 10 to 150 nm.

### Claim 15 (depends on 9)

The liquid composition according to claim 9, wherein the hollow particles are made of at least one selected from the group consisting of silica, magnesium fluoride, alumina, aluminosilicate, titania, and zirconia.

### Claim 16 (depends on 1)

An optical element comprising the film according to claim 1.

### Claim 17 (depends on 16)

An imaging apparatus comprising the optical element according to claim 16.