POLYMERISED LIQUID CRYSTAL FILM WITH IMPROVED ADHESION TO A SUBSTRATE, IN PARTICULAR TO A PLASTIC SUBSTRATE

摘要

PURPOSE: Provided are a film comprising polymerised liquid crystal (LC) material with improved adhesion to a substrate, in particular to a plastic substrate, methods for preparing such a film, a polymerisable LC material used for the preparation of such a film, a multilayer comprising such a film, and the use of the film, material and multilayer for optical, electrooptical, decorative or security devices and applications. CONSTITUTION: The film comprising polymerised liquid crystal (LC) material is characterized in that it is obtainable from a polymerisable material comprising not more than 7% by weight of compounds having two or more polymerisable groups, wherein the polymerisable LC material comprises 70 to 99% by weight of one or more compounds having one polymerisable group, 0 to 7% by weight of one or more compounds having two or more polymerisable groups, 0 to 15% by weight of non-polymerisable compounds, and 0 to 10% by weight of one or more polymerization initiators. The multilayer comprises a plastic substrate, at least one LC polymer film provided on the substrate, and at least one hardcoat film having improved resistance against mechanical stress provided on the surface of the at least one LC polymer film facing away from the substrate. The method of preparing a polymerised LC film comprises the steps of providing a layer of polymerisable LC material on a substrate; optionally aligning the LC material into uniform orientation; and polymerising the LC material, and optionally removing the polymerised film from the substrate. The method of preparing a multilayer comprises the steps of providing a layer of polymerisable LC material on a plastic substrate; optionally aligning the LC material into uniform orientation; polymerising the LC material; and providing a hardcoat film on the free surface of the polymerised LC material. The method of preparing a multllayer comprises the steps of providing a layer of a first polymerisable LC material on a plastic substrate; optionally aligning the first LC material into uniform orientation; polymerising the first LC material; providing a layer of a second polymerisable LC material on the free surface of the first polymerised LC material; optionally aligning the second LC material into uniform orientation; and polymerising the second LC material.