US 12,252,642 B2
Method for producing cholesteric liquid crystal layer, cholesteric liquid crystal layer, optically anisotropic body, and reflective film
Keisuke Kodama, Minamiashigara (JP); Yuko Suzuki, Minamiashigara (JP); and Shunya Katoh, Minamiashigara (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Mar. 18, 2022, as Appl. No. 17/698,775.
Application 17/698,775 is a continuation of application No. PCT/JP2020/033780, filed on Sep. 7, 2020.
Claims priority of application No. 2019-172344 (JP), filed on Sep. 20, 2019.
Prior Publication US 2022/0204850 A1, Jun. 30, 2022
Int. Cl. C09K 19/20 (2006.01); G02F 1/1335 (2006.01); G02F 1/13363 (2006.01); G02F 1/1337 (2006.01); G02F 1/137 (2006.01)
CPC C09K 19/2007 (2013.01) [G02F 1/133541 (2021.01); G02F 1/133553 (2013.01); G02F 1/13363 (2013.01); G02F 1/133788 (2013.01); G02F 1/13718 (2013.01); C09K 2019/2078 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A method for producing a cholesteric liquid crystal layer, comprising:
a step X of forming a cholesteric liquid crystal layer A that satisfies all of conditions 1 to 3 and in which a liquid crystal compound is aligned into a state of a cholesteric liquid crystalline phase; and
a step Y of carrying out a treatment to increase a helical pitch of the cholesteric liquid crystalline phase in the cholesteric liquid crystal layer A obtained by the step X to increase a tilt angle of an arrangement direction of bright portion and dark portion derived from the cholesteric liquid crystalline phase, as observed in a cross-section perpendicular to a main surface of the cholesteric liquid crystal layer A, with respect to a normal direction of the main surface of the cholesteric liquid crystal layer A,
condition 1: the cholesteric liquid crystal layer A has a liquid crystal alignment pattern in which a direction of a molecular axis derived from the liquid crystal compound changes while continuously rotating along at least one in-plane direction,
condition 2: the molecular axis of the liquid crystal compound is tilted with respect to the main surface of the cholesteric liquid crystal layer A on both main surfaces of the cholesteric liquid crystal layer A,
condition 3: the arrangement direction of bright portion and dark portion derived from the cholesteric liquid crystalline phase is tilted with respect to a normal line of the main surface of the cholesteric liquid crystal layer A, in the cross-section perpendicular to the main surface of the cholesteric liquid crystal layer A observed by a scanning electron microscope.