Patent ID: 7311948

Claim:
An isosorbide derivative having at least one polymerizable group, characterized in that the isororbide derivative further comprises at least one photo-convertible group suitable for adjusting the helical twisting power of the isosorbide derivative, wherein the isosorbide has the formula and wherein A stands for a bond or a p-phenylene group; B and B′ are independently O—(CH 2 2 ) o O—CO—CR′═CH 2 , o being 2-12 and R′ being H or CH 3 ; P stands for a CH 2 or a C═O group; Q and Q′ are independently selected from H, C1-C3 alkyl, C1-C3 alkoxy, halogen, and CN; n is an integer from 1 to 3; and m is an integer from 0 to 2.