New polymerizable liquid crystal materials, 10-{4-[5-(4'-ethoxyphenyl)-1, 3-dithian-2-yl] phenoxy} decyl methacrylate (5) End 10-{4-[5-octyl-1, 3-dithian-2-yl] phenoxy} decyl methacrylate (7) have been synthesized and converted into polymers. Since these polymers (5', 7') show the schlieren texture of a nematic phase (e.g. 5': G 5 N 63 I), they are a new type of liquid crystal polymer having a 1,3-dithiane ring In their mesogen units.