POLYMER BLEND FOR PREPARING LIQUID CRYSTAL ALIGNMENT LAYER

摘要

PURPOSE: Provided are a polymer blend of cinnamate polymer and polyimide polymer, which are photo-reactive polymers, for preparing liquid crystal alignment layer having a high pretilt angle in photo-alignment, a process for preparing liquid crystal alignment layer by employing the blend, a liquid crystal alignment layer prepared by the process, and a crystal cell prepared by employing the liquid crystal alignment layer. The liquid crystal alignment layer prepared by employing the polymer blend has an excellent alignment property and thermal stability, thereby making possible its wide application in the development of liquid crystal displays. CONSTITUTION: The polymer blend for preparing liquid crystal alignment layer, comprises 10 to 90% (w/w) of cinnamate polymer and 10 to 90% (w/w) of polyimide polymer. The process for preparing liquid crystal alignment layer, comprises the steps of: (i) mixing cinnamate polymer and polyimide polymer in a ratio of 1: 9 to 9: 1 (w/w), and dissolving the mixed polymers in an organic solvent; (ii) spin coating the dissolved polymers onto a glass plate; (iii) heating the polymers to obtain an alignment layer; and (iv) irradiating ultraviolet ray to the alignment layer to align liquid crystals in preferred direction.