Patent ID: 7416682

Claim:
A material given by Formula I and Ib: Wherein the groups are chosen respectively from the following: are together chosen from: * indicates the point of attachment to Formula I or Formula Ib; the phenyl groups in may independently of each other be replaced by pyridine and pyrimidine groups; wherein X is selected from S, O, NH, Se, CH 2 , P; wherein J is selected from CF 2 , CH 2 , CFH, NR 9 wherein R9 is selected from H, C1-40 branched or straight chain alkyl wherein one or more of the CH 2 groups may be replaced by O, CH and the terminal CH 3 group may be replaced by a CH 2 group or an SH, OH, COOH, CHO, O 2 CCHCH 2 or O 2 CC(CH 3 )CH 2 group; wherein a and d are independently selected from CH 3 , CF 3 , CH 2 CH 3 , OCH 3 , OCH 2 CH 3 or Formula II; b, c, e and f are independently selected from H, Formula II or C1-40 branched or straight chain alkyl wherein one or more of the CH 2 groups may be replaced by O, CFH, CF 2 , CH and the terminal CH 3 group may be replaced by a CH 2 group or an SH, OH, CF 3 , COOH, CHO, O 2 CCHCH 2 or O 2 CC(CH 3 )CH 2 group wherein Formula II is given by: wherein Y is selected from O, —CO 2 —, O 2 C, S, CH 2 , or a single bond; Q is selected from (CH 2 )n, n is 1-20 or (CH 2 )m-[Si(L2)-O]q-Si(L2)-(CH 2 )p- where m is 2-20, p is 2-20, q is 1-12 and the L groups are independently of each other selected from CH 3 , CF 3 , H; Z is O or CO 2 or O 2 C or CH 2 or a single bond; is a mesogenic group; T is 1 or 2 or 3; when T is 2 then Q may also be selected from (CH 2 )gN((CH 2 )r) 2 , (CH 2 )gSi(CH 3 )((CH 2 )r) 2 , (CH 2 )gP((CH 2 )r) 2 , (CH 2 )gGe(CH 3 )((CH 2 )r) 2 , wherein the values of g and r are independently selected from 1-20; when T is 3 then Q may also be selected from (CH 2 )g′Si((CH 2 )r′) 3 , and (CH 2 )g′Ge((CH 2 )r′) 3 ; wherein the values of g′ and r′ are independently selected from 1-20; provided that at least one of a, b, c, d, e, f are selected from Formula II.