Preparation of Color Filter Photo Resists for Generating Color Pixels in Liquid Crystal Displays by Synthesis and Applications of Polymeric Binders

摘要

Color filter photo resist (CFPR) is a key material for manufacturing color filters of LCDs, which consist of additives such as pigments, binders, multi-functional monomers and surfactants. Among these additives, this study focused on binders that affect development time, pattern clarity, heat and chemical resistance. In addition, this study was carried out based on several purposes. First, introductions of new binders have been requested due to the recent trend of red pigments; that is, a di-eketo-pyrrolo-pyrrole with a smaller particle size and less polarity for a high contrast ratio is desired. The pigments for a high contrast ratio usually have a particle size in the range of 40 -60 nm, while conventional pigments of anthraquinone have a particle size of approximately 90 nm. For this reason, less polar styrene was introduced to increase affinity by replacing or reducing benzyl methacrylate. Traditionally, a binder prepared from benzyl methacrylate and methacrylic acid has been widely used. Second, introductions of less expensive materials, such as styrene and methyl methacrylate, have been requested to contribute to the extreme competiveness of the LCD industry. For this study, styrene, methacrylic acid, methyl methacrylate and benzyl methaceylate were employed to synthesize the random copolymer into polymeric binders, as shown in Figure 1. Finally, CFPRs were prepared from these binders to evaluate their properties.