PROCESS FOR BROADENING CHOLESTERIC REFLECTION BANDS OF PHOTOPOLYMERIZABLE CHOLESTERIC LIQUID CRYSTALS AND OPTICAL ELEMENTS PRODUCED BY THIS PROCESS

摘要

Process for broadening cholesteric reflectionbands of photopolymerizable cholesteric liquid crystals,and optical elements produced by this process. Theinvention relates to a process for broadening thecholesteric reflection bands of photopolymerizablecholesteric liquid crystals, which comprises thefollowing process steps:1) partial polymerization of a layer containingphotopolymerizable cholesteric liquid crystals byexposure to actinic light for a defined brief period ata defined temperature,2) observance of a defined waiting time withoutexposure (dark phase) at a defined temperature,3) fixing of the resultant layer by exposure toactinic light at a defined temperature.