# US 2022/0033601 A1 · Transparent polymer hardcoats with antimicrobial efficacy

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- Number: US 2022/0033601 A1
- Document ID: US20220033601A1
- Status: Published application
- Kind: A1
- Application number: 17/390,060
- Filed: 2021-07-30
- Published: 2022-02-03
- Earliest claimed: 2020-07-31
- Applicants: C3 Nano, Inc.
- Inventors: Faraz Azadi Manzour; Alexander Seung-il Hong; Salman Mansoor Faroqui; Xiqiang Yang; Ajay Virkar
- Web page: https://patentgrep.com/patent/US20220033601A1

## CPC

- C08J 7/046: Forming abrasion-resistant coatings; Forming surface-hardening coatings
- C09D 175/16: having terminal carbon-to-carbon unsaturated bonds
- A01N 59/16: Heavy metals; Compounds thereof
- A01N 59/20: Copper
- A01P 1/00: Disinfectants; Antimicrobial compounds or mixtures thereof
- B32B 27/08: of synthetic resin
- B32B 27/24: using solvents or swelling agents
- B32B 33/00: Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
- C08J 7/0427: {with only one layer of a composition containing a polymer binder (with more layers C08J7/042)}
- C08K 3/36: Silica
- C08K 5/098: Metal salts of carboxylic acids
- C08L 33/08: Homopolymers or copolymers of acrylic acid esters
- C08L 75/14: Polyurethanes having carbon-to-carbon unsaturated bonds
- C08L 75/16: having terminal carbon-to-carbon unsaturated bonds
- C09D 4/00: Coating compositions, e.g. paints, varnishes or lacquers, based on organic non-macromolecular compounds having at least one polymerisable carbon-to-carbon unsaturated bond {; Coating compositions, based on monomers of macromolecular compounds of groups C09D183/00 - C09D183/16}
- G06F 3/041: Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- B32B 2255/10: on synthetic resin layer or on natural or synthetic rubber layer
- B32B 2255/26: Polymeric coating
- B32B 2307/412: Transparent
- B32B 2307/536: Hardness
- B32B 2307/732: Dimensional properties
- B32B 2333/08: Polymers of acrylic acid esters, e.g. PMA, i.e. polymethylacrylate
- B32B 2375/00: Polyureas; Polyurethanes
- B32B 2379/08: Polyimides
- B32B 2457/208: Touch screens
- C08J 2367/02: Polyesters derived from dicarboxylic acids and dihydroxy compounds; (C08J2367/06 takes precedence)
- C08J 2379/08: Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors
- C08J 2475/16: having terminal carbon-to-carbon unsaturated bonds
- C08K 2201/011: Nanostructured additives
- C08L 2201/10: Transparent films; Clear coatings; Transparent materials
- C08L 2203/16: used for films
- C08L 2203/20: use in electrical or conductive gadgets
- G06F 2203/04102: Flexible digitiser, i.e. constructional details for allowing the whole digitising part of a device to be flexed or rolled like a sheet of paper
- G06F 2203/04103: Manufacturing, i.e. details related to manufacturing processes specially suited for touch sensitive devices
- C08J: WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H (working, e.g. shaping, of plastics B29)
- 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)
- A01N: PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF (preservation of food or foodstuff A23); BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES (preparations for medical, dental or toiletry purposes which kill or prevent the growth or proliferation of unwanted organisms A61K); PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
- A01P: BIOCIDAL, PEST REPELLANT, PEST ATTRACTANT OR PLANT GROWTH REGULATORY ACTIVITY OF CHEMICAL COMPOUNDS OR PREPARATIONS
- B32B: LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)

## Abstract

Transparent polymeric hardcoats with antimicrobial efficacy are described along with compositions for preparing the hardcoats. The transparent polymeric hardcoats at appropriate thicknesses can provide optical properties of high optical transmission, low haze and high clarity, and are suitable for use in electronic displays designed for commercial applications intended for high consumer use. Touch screens having the transparent polymeric hardcoats are also described.

## Claims

### Claim 1

A coating composition comprising:
from about 0.025 wt % to about 90 wt % polymeric precursor,
from about 0.005M to about 1M antimicrobial metal salt, and
organic solvent.

### Claim 2 (depends on 1)

The coating composition of claim 1, the antimicrobial metal salt comprising Ag+.

### Claim 3 (depends on 1)

The coating composition of claim 1, the antimicrobial metal salt comprising Cu+2.

### Claim 4 (depends on 1)

The coating composition of claim 1, the antimicrobial metal salt comprising copper (II) nitrate, silver trifluoroacetate, silver tetrafluoroborate, silver hexafluoroantimonate or combinations thereof.

### Claim 5 (depends on 1)

The coating composition of claim 1, the antimicrobial metal salt comprising copper (II) hexafluoroacetylacetonate.

### Claim 6 (depends on 1)

The coating composition of claim 1, the polymeric precursor comprising UV curable acrylates.

### Claim 7 (depends on 1)

The coating composition of claim 1, the polymeric precursor comprising urethane oligomers having acrylate functionality.

### Claim 8 (depends on 1)

The coating composition of claim 1, the polymeric precursor comprising diglycidyl ethers of alkyl glycols.

### Claim 9 (depends on 1)

The coating composition of claim 1, the polymeric precursor being free of aromatic groups.

### Claim 10 (depends on 1)

The coating composition of claim 1, the organic solvent comprising aromatic solvents, alkanes, alcohols, ketones, esters, ethers, or mixtures thereof.

### Claim 11 (depends on 1)

The coating composition of claim 1, further comprising silica nanoparticles.

### Claim 12 (depends on 1)

The coating composition of claim 1, further comprising nanodiamonds.

### Claim 13

A transparent optical film comprising:
an antimicrobial hardcoat layer disposed on a transparent substrate, wherein the antimicrobial hardcoat layer comprises antimicrobial metal ions.

### Claim 14 (depends on 13)

The transparent optical film of claim 13, the transparent substrate comprising a polyimide.

### Claim 15 (depends on 13)

The transparent optical film of claim 13, the antimicrobial hardcoat layer further comprising from about 0.001 wt % to about 1 wt % nanoparticles.

### Claim 16 (depends on 13)

The transparent optical film of claim 13, an outermost surface of the antimicrobial hardcoat layer exhibiting a water contact angle of at least about 112.5°.

### Claim 17 (depends on 13)

The transparent optical film of claim 13, the hardcoat layer having a thickness of from about 2.5 microns to about 50 microns.

### Claim 18 (depends on 13)

The transparent optical film of claim 13, having a b* no more than about 1.5, total transmittance of at least about 85%, and a haze value of no more than about 1.0%.

### Claim 19 (depends on 13)

The transparent optical film of claim 13 wherein the antimicrobial metal ions comprise copper (+2) ions.

### Claim 20 (depends on 13)

The transparent optical film of claim 13 wherein the animicrobial hardcoat layer comprises from about 0.02 wt % to about 10 wt % antimicrobial metal ions.

### Claim 21

A touch screen comprising:
a substrate;
a touch sensor supported by the substrate, and
an antimicrobial hardcoat layer disposed over and substantially covering the touch sensor, wherein the antimicrobial hardcoat layer comprises antimicrobial metal ions.