US 12,228,758 B2
Liquid crystal multilayer film and preparation method thereof
Augustinus Jozef Johannes Kragt, Nijmegen (NL); Xiaowen Hu, Guangdong (CN); and Guofu Zhou, Guangdong (CN)
Assigned to SHENZHEN GUOHUA OPTOELECTRONICS CO., LTD., Shenzhen (CN); and CLIMAD TECHNOLOGY B.V., Nijmegen (NL)
Appl. No. 17/765,896
Filed by SHENZHEN GUOHUA OPTOELECTRONICS CO., LTD., Guangdong (CN); and CLIMAD TECHNOLOGY B.V., Nijmegen (NL)
PCT Filed Oct. 30, 2020, PCT No. PCT/CN2020/125372
§ 371(c)(1), (2) Date Apr. 1, 2022,
PCT Pub. No. WO2022/011882, PCT Pub. Date Jan. 20, 2022.
Claims priority of application No. 202010680066.5 (CN), filed on Jul. 15, 2020.
Prior Publication US 2022/0381959 A1, Dec. 1, 2022
Int. Cl. G02B 5/20 (2006.01); C09K 19/38 (2006.01); C09K 19/58 (2006.01); G02B 1/02 (2006.01)
CPC G02B 5/208 (2013.01) [C09K 19/3861 (2013.01); C09K 19/588 (2013.01); G02B 1/02 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A liquid crystal multilayer film, comprising:
a first ultraviolet blocking material;
a first cholesteric liquid crystal layer, wherein the first cholesteric liquid crystal layer is coated on the first ultraviolet blocking material,
wherein the first cholesteric liquid crystal layer is prepared from a liquid crystal mixture comprising a polymerizable liquid crystal monomer, a polymerizable chiral dopant and a photoinitiator, the first cholesteric liquid crystal layer further includes an organic solvent cyclopentanone, a surfactant is dissolved in the organic solvent, the surfactant is polyacrylate-based surfactant, the polymerizable liquid crystal monomer material includes 2-(methoxycarbonyl)-1,4-phenylene-bis (6-((((4-(acryloyloxyoxy) ethoxy) carbonyl) oxy)-2-naphthoic acid); and
a second cholesteric liquid crystal layer, wherein at least the second cholesteric liquid crystal layer is coated on the first cholesteric liquid crystal layer, and the first cholesteric liquid crystal layer and the second cholesteric liquid crystal layer have different chirality;
wherein, the polymerizable chiral dopant is a levorotatory chiral dopant, and the liquid crystal mixture comprises the polymerizable liquid crystal monomer, 1.2-6.5 wt % of the levorotatory chiral dopant and 0.5-5 wt % of the photoinitiator; or the polymerizable chiral dopant is a dextrorotatory chiral dopant, and the liquid crystal mixture comprises the polymerizable liquid crystal monomer, 2.6-18.8 wt % of the dextrorotatory chiral dopant and 0.5-5 wt % of the photoinitiator;
wherein, the first ultraviolet blocking material includes at least one selected from the group consisting of glass, polyethylene terephthalate, biaxially oriented polypropylene, and polycarbonate.