# US 11,079,631 B2 · Preparation method for a temperature-responsive light reflecting coating and the light reflecting coating > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,631 B2 - Document ID: US11079631B2 - Status: Granted - Kind: B2 - Application number: 16/495,787 - Filed: 2018-05-04 - Published: 2020-08-13 - Granted: 2021-08-03 - Earliest claimed: 2018-04-09 - Assignees: South China Normal University; Shenzhen Guohua Optoelectronics Co., Ltd. - Applicants: South China Normal University; Shenzhen Guohua Optoelectronics Co., Ltd. - Inventors: Guofu Zhou; Laurens De Haan; Pei Zhang; Wei Zhao - Web page: https://patentgrep.com/patent/US11079631B2 ## CPC - G02F 1/133711: {by organic films, e.g. polymeric films} - C09D 5/26: Thermosensitive paints - C09K 19/2007: {the chain containing -COO- or -OCO- groups} - C09K 19/3804: {with mesogenic groups in the main chain} - C09K 19/586: {Optically active dopants; chiral dopants} - G02B 5/26: Reflecting filters (G02B5/28 takes precedence) - G02B 5/3016: {involving passive liquid crystal elements (optical properties of liquid crystals G02F1/0063; polarising elements associated with active liquid crystal devices G02F1/133528)} - C09D 5/004: {Reflecting paints; Signal paints} - C09K 2019/0448: {the end chain group being a polymerizable end group, e.g. -Sp-P or acrylate} - C09K 2019/2078: {Ph-COO-Ph-COO-Ph} - C09K 2019/3408: {Five-membered ring with oxygen(s) in fused, bridged or spiro ring systems} - G02F 1/133726: {made of a mesogenic material} - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - 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) - C09K: MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A preparation method for a temperature-responsive light reflecting coating is provided comprising: forming a main chain cholesteric phase liquid crystal polymer by a polymerization reaction between an acrylate liquid crystal and an amine, and coating the main chain cholesteric phase liquid crystal polymer on a substrate to form a light reflecting coating, wherein the acrylate comprises a chiral acrylate, and the reflection wavelength of the reflecting coating is determined by the content of the chiral acrylate liquid crystal and the polymerization degree of the main chain cholesteric phase liquid crystal polymer formed. The method may further comprise cross-linking the main chain cholesteric phase liquid crystal polymer to obtain a polymer network so as to form a solid coating. The present disclosure further provides a temperature-responsive light reflecting coating. The preparation of the main chain cholesteric phase liquid crystal polymer of the present disclosure requires only a simple thermally-driven polymerization reaction. ## Claims ### Claim 1 A preparation method for a temperature-responsive light reflecting coating, comprising: forming a main chain cholesteric liquid crystal polymer by a polymerization reaction between an acrylate liquid crystal and an amine, wherein the acrylate contains chiral acrylate, and coating the main chain cholesteric liquid crystal polymer on a substrate to form a light reflecting coating, and the reflection wavelength of the light reflecting coating is determined by at least one of: temperature at which cross-linking is performed, content of the chiral acrylate liquid crystal, and the polymerization degree of the main chain cholesteric liquid crystal polymer formed; and successively cross-linking the main chain cholesteric liquid crystal polymer on each of a plurality of portions of the light reflecting coating at a temperature different from that of another portion of the light reflecting coating using a photomask, to fix the reflecting wavelength of each portion of the light reflecting coating and cure the light reflecting coating, thus forming a desired pattern with portions reflecting different wavelengths. ### Claim 2 (depends on 1) The preparation method for a temperature-responsive light reflecting coating according to claim 1, wherein the polymerization reaction between the acrylate liquid crystal and the amine is carried out as follows: the amine reacts with the acrylate liquid crystal to form a secondary amine through Michael addition reaction, and the secondary amine reacts with another acrylate liquid crystal to form a tertiary amine. ### Claim 3 (depends on 2) The preparation method for a temperature-responsive light reflecting coating according to claim 2, wherein the amine is a primary amine and/or the acrylate liquid crystal is a diacrylate liquid crystal. ### Claim 4 (depends on 3) The preparation method for a temperature-responsive light reflecting coating according to claim 3, wherein heating is performed when carrying out the polymerization reaction. ### Claim 5 (depends on 1) The preparation method for a temperature-responsive light reflecting coating according to claim 1, wherein an alignment layer is added onto the substrate to assist alignment of molecules. ### Claim 6 (depends on 2) The preparation method for a temperature-responsive light reflecting coating according to claim 2, further comprising a step of cross-linking the main chain cholesteric liquid crystal polymer to obtain a polymer network so as to form a solid coating. ### Claim 7 (depends on 6) The preparation method for a temperature-responsive light reflecting coating according to claim 6, wherein the molar ratio of acrylate liquid crystal to amine is controlled so that acrylate end groups are present in the main chain cholesteric liquid crystal polymer. ### Claim 8 (depends on 7) The preparation method for a temperature-responsive light reflecting coating according to claim 7, wherein ultraviolet irradiation is carried out to initiate radicals of the main chain cholesteric liquid crystal polymer to cross-link. ### Claim 9 (depends on 8) The preparation method for a temperature-responsive light reflecting coating according to claim 8, wherein the method, before coating the main chain cholesteric liquid crystal polymer onto the substrate, further comprises a step of adding a radical initiator in the main chain cholesteric liquid crystal polymer. ### Claim 10 (depends on 1) A temperature-responsive light reflecting coating formed by the method as claimed in any one of claim 1, comprising a substrate and a main chain cholesteric liquid crystal polymer coated on the substrate. ### Claim 11 (depends on 2) The preparation method for a temperature-responsive light reflecting coating according to claim 2, wherein the amine is a primary amine or the acrylate liquid crystal is a diacrylate liquid crystal.