Process of preparing lamination film, lamination film and heat shield

摘要

A process of preparing a lamination film comprising two or more layers of a fixed cholesteric liquid-crystal phase is disclosed. The process comprises (a) applying a coating liquid of a curable liquid crystal composition comprising a rod-like liquid crystal compound, an alignment-control agent capable of controlling an alignment of the rod-like liquid crystal compound and a solvent to a surface; (b) drying the applied curable liquid crystal composition to form a cholesteric liquid-crystal phase; (c) carrying out a curing reaction of the composition and fixing the cholesteric liquid-crystal phase, thereby to form a lower layer; and (d) repeating the steps (a) to (c) on the lower layer, thereby to form an upper layer; wherein at least a part of the alignment-control agent in the lower layer diffuses into the upper layer.

主权项

1. A process of preparing a lamination film comprising two or more layers of a fixed cholesteric liquid-crystal phase comprising, at least,
(a) applying a curable liquid crystal composition comprising a rod-like liquid crystal compound, an alignment-control agent capable of controlling an alignment of the rod-like liquid crystal compound and a solvent to a surface, wherein the curable liquid crystal composition comprises a chiral agent capable of controlling a twisting direction and/or helical pitch of a cholesteric liquid-crystal phase; and wherein the alignment-control agent is capable of localizing at a film surface and aligning the direction of a long axis of molecules of the rod-like liquid crystal compound parallel to the layer plane; (b) drying the applied curable liquid crystal composition to form a cholesteric liquid-crystal phase; (c) carrying out a curing reaction of the composition and fixing the cholesteric liquid-crystal phase, thereby to form a lower layer; and (d) repeating the steps (a) to (c) on the lower layer, thereby to form an upper layer; wherein at least a part of the alignment-control agent in the lower layer diffuses into the upper layer after the upper layer curable liquid crystal composition is applied to the lower layer, but before the upper layer curable liquid crystal composition is exposed to the curing reaction, and the degree of diffusion of the alignment-control agent from the lower layer into the upper layer is controlled by adjusting the hardness of the lower layer, or the degree of diffusion of the alignment-control agent from the lower layer into the upper layer is controlled by adjusting the solid content concentration of the upper layer curable liquid crystal composition of the curable liquid crystal composition and/or selecting the solvent.