# US 11,999,844 B2 · Optically clear shear thickening fluids and optical display device comprising same

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- Number: US 11,999,844 B2
- Document ID: US11999844B2
- Status: Granted
- Kind: B2
- Application number: 17/163,604
- Filed: 2021-02-01
- Published: 2021-09-09
- Granted: 2024-06-04
- Earliest claimed: 2020-03-09
- Assignees: Rohm and Haas Electronic Materials LLC
- Applicants: Rohm and Haas Electronic Materials LLC
- Inventors: Deyan Wang; Yixuan Song
- Web page: https://patentgrep.com/patent/US11999844B2

## CPC

- C08L 33/066: {containing -OH groups}
- C08F 220/20: of polyhydric alcohols or phenols {, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate}
- C08K 3/36: Silica
- C08K 9/06: with silicon-containing compounds
- C08L 33/064: {containing anhydride, COOH or COOM groups, with M being metal or onium-cation}
- C08L 33/068: {containing glycidyl groups}
- C09D 7/62: modified by treatment with other compounds
- C09D 7/67: {Particle size smaller than 100 nm}
- C09D 7/80: Processes for incorporating ingredients
- C09D 133/064: {containing anhydride, COOH or COOM groups, with M being metal or onium-cation}
- C09D 133/066: {containing -OH groups}
- C09D 133/068: {containing glycidyl groups}
- G02B 1/14: Protective coatings, e.g. hard coatings
- B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals
- B82Y 30/00: Nanotechnology for materials or surface science, e.g. nanocomposites
- C08K 2201/005: Additives being defined by their particle size in general
- C08L 2205/02: containing two or more polymers of the same C08L -group
- C08L 2205/035: containing four or more polymers in a blend
- C08L 2312/06: by radiation
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08K: Use of inorganic or non-macromolecular organic substances as compounding ingredients (paints, inks, varnishes, dyes, polishes, adhesives C09)
- 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)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES

## Abstract

There is disclosed an optically clear shear thickening fluid and a protection assembly comprising the optically clear shear thickening fluid. It further relates to uses of the optically clear shear thickening fluid in electronic devices, particularly in optical display devices. The optically clear shear thickening fluid includes: (a) a solid nanoparticle having an average particle size equal to or less than 100 nm; (b) at least one polymer; and (c) a liquid medium. The at least one polymer is substantially soluble in the liquid medium.

## Claims

### Claim 1

An optically clear shear thickening fluid comprising:
a solid nanoparticle having an average particle size equal to or less than 100 nm;
at least one polymer; and
a liquid medium,
wherein the at least one polymer is substantially soluble in the liquid medium, and wherein the at least one polymer is selected from the group consisting of poly(2-hydroxyethyl acrylate-co-glycidyl methacrylate-co-methacrylic acid), poly(2-hydroxyethyl acrylate-co-glycidyl methacrylate-co-2-carboxyethyl acrylate), poly(2-hydroxyethyl acrylate) partially capped with acrylate functional groups, polyethylene glycol diacrylate, polyethylene glycol dimethacrylate, polyethylene glycol monoacrylate, polyethylene glycol monomethacrylate, a copolymer of 2-hydroxyethyl acrylate, and combinations thereof.

### Claim 2

An optically clear shear thickening fluid comprising:
a solid nanoparticle having an average particle size equal to or less than 100 nm;
at least one polymer;
a liquid medium; and
a crosslinking agent selected from the group consisting of tetrakis(methoxymethyl) glycoluril, hexamethoxymethyl melamine, polyethylene glycol diglycidyl ether, butane diglycidyl ether, succinic acid, propane tricarboxylic acid, isocyanate, and blocked isocyanate,
wherein the at least one polymer is substantially soluble in the liquid medium.

### Claim 3 (depends on 1)

The shear thickening fluid of claim 1, wherein the solid nanoparticle has a refractive index of 1.3 to 2.0 and the at least one polymer has the same refractive index as the solid nanoparticle.

### Claim 4

An optically clear shear thickening fluid comprising:
a solid nanoparticle having an average particle size equal to or less than 100 nm;
at least one polymer; and
a liquid medium,
wherein the at least one polymer is substantially soluble in the liquid medium; comprises a crosslinkable group selected from the group consisting of hydroxyl, carboxyl, epoxy, acrylate and combinations thereof; and wherein the at least one polymer comprises a first polymer having a first crosslinkable group and a second polymer having a second crosslinkable group, wherein the first polymer is crosslinked with the second polymer.

### Claim 5 (depends on 4)

The shear thickening fluid of claim 4, wherein the first polymer having a first crosslinkable group and the second polymer having a second crosslinkable group are crosslinked at a temperature below 250° C.

### Claim 6 (depends on 4)

The shear thickening fluid of claim 4, wherein the first polymer having a first crosslinkable group and the second polymer having a second crosslinkable group are ultraviolet (UV) crosslinked.

### Claim 7 (depends on 1)

The shear thickening fluid of claim 1, wherein the liquid medium is selected from the group consisting of alkylene glycols, polyalkylene glycols, glycerol, polyol and combinations thereof.

### Claim 8 (depends on 1)

The shear thickening fluid of claim 1, wherein the solid nanoparticles are inorganic or organic nanoparticles.

### Claim 9 (depends on 8)

The shear thickening fluid of claim 8, wherein the inorganic nanoparticle is selected from the group consisting of silica, calcium carbonate, iron oxide, kaolin clays, aluminum oxide, and combinations thereof.

### Claim 10 (depends on 9)

The shear thickening fluid of claim 9, wherein the silica nanoparticle is a monodisperse uniformed-size silica nanoparticle made by hydrolysis of tetraethyl orthosilicate in alcohol.

### Claim 11 (depends on 10)

The shear thickening fluid of claim 10, wherein the silica nanoparticle is modified by an organosilicon compound of organoalkoxysilane or methallyl silane.

### Claim 12 (depends on 1)

The shear thickening fluid of claim 1, wherein the solid nanoparticle has an average particle size of 20 to 100 nm.

### Claim 13 (depends on 1)

A protection assembly comprising a first optically clear layer and the shear thickening fluid of claim 1 disposed on the first optically clear layer.

### Claim 14 (depends on 13)

The protection assembly of claim 13, further comprising a second optically clear layer disposed on the shear thickening fluid.