Patent ID: 6030668
Filing Date: 2000-02-29
Classification: C08G,C09K

Abstract:
A material of the formula I ##STR28## n=at least 5; R.sub.x, R.sub.y and R.sub.z are independently selected from formula IA: ##STR29## wherein Y is selected from the group consisting of COO, OCO, O, S, CHOH, CHF and CH.sub.2 ;Q=(CH.sub.2).sub.q wherein one or more non-adjacent methylenes may be replaced by O and q=1-20;Z is selected from the group consisting of O, S, a single covalent bond, COO and OCO;provided that Y is CH.sub.2 then q may also be 0; ##STR30## represents any mesogenic group; R.sub.x, R.sub.y and R.sub.z are also independently selected from the group consisting of H, OH, OCOR.sup.1, COOH, CO.sub.2 R.sup.1, (CH.sub.2).sub.p OH, (CH.sub.2).sub.p CO.sub.2 H, --CH.sub.2).sub.p OR.sup.1 and --CH.sub.2).sub.p CO.sub.2 R.sup.1 where p=1-20 and R.sup.1 =H or C.sub.1-16 alkyl;provided that when R.sup.1 =C.sub.2-16 alkyl the terminal CH.sub.3 group may be replaced by Br or Cl; and further provided that at least one of R.sub.x, R.sub.y and R.sub.z is selected from formula IA.