New polymerizable liquid crystal materials : 4-(5-alkyl-1,3-oxathian-2-yl)-phenylacrylate (9) and 4-(5-alkyl- 1,3-oxathian-2-yl)-phenyl methacrylates (9’) have been synthesized and converted into respective polymers. Polymer 9’ having the 1,3-oxathiane ring in their principal structure show a shlieren texture of nematic liquid crystal phase (G 81 N 140 I), therefore this is a new type of liquid crystal polymer having 1,3-oxathiane ring in their principal structure.