Patent ID: 7125590

Claim:
A liquid crystal film obtained by fixing an aligned structure of a liquid crystal material containing at least a side chain polymeric liquid crystalline substance obtained by copolymerizing the (meth)acrylic portion of a (meth)acrylic compound having an oxetanyl group represented by formula (1) below with another (meth)acrylic compound and a difunctional low molecular weight liquid crystalline substance having two oxetanyl groups represented by formula (2): wherein R 1 is hydrogen or methyl; R 2 , R 3 , and R 4 are each independently selected from the group consisting of hydrogen, methyl,and ethyl; L 1 , L 2 , L 3 , and L 4 are each independently selected from the group consisting of a single bond, —O—, —O—CO—, and —CO—O—; M 1 and M 2 are each independently represented by a formula selected from the group consisting of formulas (3) , (4) and (5) below; and l, m, n, and o are each independently an integer from 0 to 10: —P 1 -L 5 -P 2 -L 6 -P 3 — (3) —P 1 -L 5 -P 3 — (4) —P 3 — (5) wherein P 1 and P 2 are each independently a group selected from the group consisting of formulas (6) below; P 3 is a group selected from the group consisting of formulas (7) below; and L 5 and L 6 are each independently selected from the group consisting of a single bond, —CH═CH—, —C≡C—, —O—, —O—CO— and CO—O—: