Patent ID: 6596193
Filing Date: 2003-07-22
Classification: C09K

Abstract:
A reactive liquid crystal compound of formula IIRâ€²â€”Gâ€²â€”Râ€³â€ƒâ€ƒII wherein at least one of terminal groups Râ€² and Râ€³ is a reactive group exhibiting one reaction site selected from HOWâ€²2Câ€”, HSWâ€²2Câ€”, UWâ€²Nâ€”, a carboxyl group, â€ƒand O&boxH;Câ€”Nâ€”, or is a polymerizable reactive group exhibiting two or more reactive sites selected from Wâ€²2C&boxH;CWâ€²â€”, and â€ƒwherein Wâ€² is in each case independently, H or an alkyl group with 1-5 C atoms, and one of terminal groups Râ€² and Râ€³ is optionally an alkyl group of tip 15 C atoms which is unsubstituted or substituted by one or more halogens and in which one or more CH2 groups is in each case independently replaced by â€”Oâ€”, â€”Sâ€”, â€”COâ€”, â€”OCOâ€”, â€”COâ€”Oâ€”, or â€”Oâ€”COâ€”Oâ€” wherein O atoms are not directly linked to one another, Gâ€² is a rod-like diyl group of the formula â€ƒâ€”S1â€”(A5â€”Z3)mâ€”A6â€”S2â€”â€ƒwherein S1 and S2 are each alkylene groups with 0-20 C atoms which can be linear or branched, it also being possible for one or more CH2 groups to be replaced, in each case independently from each other, by â€”Oâ€”, â€”COâ€”, â€”Sâ€” or â€”NWâ€²â€” with the proviso that O atoms are not linked directly to one another, A5 and A6 are, independently from each other, a) a cyclohexylene group, wherein one or two non-adjacent CH2 groups may be replaced by O or S atoms, b) an unsubstituted 1,4-phenylene group wherein one to three CH groups may be replaced by â€”Nâ€” or a 1,4-phenylene group which is mono- or polysubstituted by F, Cl and/or CH3, c) a bicyclo(2,2,2)octylene group, a naphthalene-2,6-diyl group, a decahydronaphthalene-2,6-diyl group or 1,2,3,4-tetrahydro-naphthalene group, Z3 is, independently from each other, â€”COâ€”Oâ€”, â€”Oâ€”COâ€”, â€”CH2CH2â€”, â€”CH2Oâ€”, â€”OCH2â€”, â€”Câ‰¡Câ€” or a single bond, and m is 1, 2, 3, or 4; â€ƒwherein at least one of group Z3 is Câ‰¡Câ€”.