Linear and cyclic polymers or oligomers having a photoreactive ethene group
AssigneeHoffmann-La Roche Inc.
InventorsRolf-Peter Herr, Stephen Kelly, Martin Schadt, Klaus Schmitt, Andreas Schuster
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Abstract
The invention is concerned with linear and cyclic polymers or oligomers having a photoreactive ethene group. The polymers are of the formula ##STR1## wherein M.sub.a, M.sub.b, M.sub.c are monomer units for homo- or copolymers; x, y, z are mole fractions of the copolymers, whereby in each case 0<x.ltoreq.1; 0.ltoreq.y.ltoreq.1 and 0.ltoreq.z<1; S.sub.a, S.sub.b are spacer units; Z.sub.a, Z.sub.b are molecule units which can undergo photochemical isomerization/dimerization; n is a magnitude of 4-100 000 and m is 0 or 1, The compounds are used as an orientating layer for liquid crystals.
Claims6
A polymer of formula I ##STR8## wherein M.sub.a, M.sub.b, M.sub.c are monomer units for homo- or copolymers;
- x, y, z are mole fractions of the copolymers, whereby in each case 0<X.ltoreq.1;
- 0.ltoreq.y.ltoreq.1 and 0.ltoreq.z<1;
- S.sub.a, S.sub.b are independently of one another, methylene, 1,2-ethylene, 1,3-propylene, 1,4-butylene, 1,5-pentylene, 1,6-hexylene, 1,2-propylene, 1,3-butylene, cyclopentane-1,2-diyl, cyclopentane-1,3-diyl, cyclohexane-1,3-diyl, cyclohexane-1,4-diyl, piperidine-1,4-diyl, piperizine-1,4-diyl, 1,2-phenylene, 1,3-phenylene, 1,4-phenylene, ethyleneoxy, ethyleneoxycarbonyl, ethylenecarboxy, CONH-- or --CONR' in which R.sup.1 is lower alkyl;
- Z.sub.a, Z.sub.b each independently are formula II ##STR9## wherein ring A.sup.1 is 1,4-phenylene, which is unsubstituted or substituted with at least one of halogen, cyano and nitro, or pyridine-2,5-yl, pyrimidine-2-5-yl, 2,5-thiophenediyl, 2,5-furanylene, 1,4- or 2,6-naphthylene, in which a CH group can be replaced by nitrogen;
- ring A,A.sup.2 each individually are 1,4-phenylene, which is unsubstituted or substituted with at least one of halogen, cyano, and nitro, pyridine-2-5-yl, pyrimidine-2,5-yl, or 2,5-thiophenediyl, 2,5-furanylene, trans-1,4-cyclohexylene, trans-1,3-dioxane-2,5-yl or 1,4-piperidyl;
- A.sup.3 is --COO--, --CONH--, --CO--E--, 1,4-phenylene, which is unsubstituted or substituted with at least one of halogen, cyano and nitro, or pyridine-2,5-yl, pyrimidine-2-5-yl, 2,5-thiophenediyl, 2,5-furanylene, 1,4- or 2,6-naphthylene, in which a CH group can be replaced by nitrogen;
- E is 1,4-phenylene, which is unsubstituted or substituted with at least one of halogen, cyano and nitro, or pyridine-2,5-yl, pyrimidine-2,5-yl, 2,5-thiophenediyl, 2,5-furanylene, 1,4- or 2,6-naphthylene, in which a CH group can be replaced by nitrogen;
- Z,Z.sup.1 each independently are a single covalent bond, --CH.sub.2 CH.sub.2 --, COO--, --OOC--, --OCH.sub.2 --, CH.sub.2 O--, --C.tbd.C--, --(CH.sub.2).sub.4, --O(CH.sub.2).sub.3 --, --(CH.sub.2).sub.3 O-- or the trans form of --OCH.sub.2 CH.dbd.CH--, --CH.dbd.CHCH.sub.2 O--, --(CH.sub.2).sub.2 CH.dbd.CH-- or --CH.dbd.CH(CH.sub.2).sub.2 --;
- R.sup.1 is hydrogen, halogen, cyano, nitro, NCS, alkyl with 1 to 12 carbon atoms, which is unsubstituted or substituted with fluorine and in which 1 or 2 non-adjacent --CH.sub.2 -- groups can be replaced by oxygen, --COO--, --OOC--, --CO-- and in which a --CH.sub.2 CH.sub.2 -- group can be replaced by --CH.dbd.CH--;
- n,p each independently are 0 or 1;
- X,Y each independently are hydrogen, halogen, cyano, alkyl with 1 to 12 carbon atoms which is unsubstituted or substituted with fluorine and in which 1 or 2 non-adjacent --CH.sub.2 -- groups can be replaced by oxygen, --COO--, --OOC--, --CO-- and/or --CH.dbd.CH--;
- with the proviso that A.sup.3 is different from --COO--, when simultaneously n and p each are 0, A.sup.1 is phenyl, R.sup.1 is hydrogen or methoxy and S.sub.a and, respectively S.sub.b are a single bond;
- n is from 4-100 000 and
- m is 0 or 1.
Dependencies are inferred from the claim text.