Patent ID: 6773766
Filing Date: 2004-08-10
Classification: C09K

Abstract:
A method of producing an optical element, comprising: polymerizing a mixture of at least one polymerizable liquid-crystalline compound of formula I:Z1â€”Y1-A1-Y3-M-Y4-A2-Y2â€”Z2â€ƒâ€ƒ(I), in whichZ1 and Z2, independently of one another, are a radical containing reactive, polymerizable groups; Y1-Y4, independently of one another, are a single chemical bond, â€”Oâ€”, â€”Sâ€”, â€”Oâ€”COâ€”, â€”COâ€”Oâ€”, â€”Oâ€”COâ€”Oâ€”, â€”COâ€”NRâ€”, â€”NRâ€”COâ€”, â€”Oâ€”COâ€”NRâ€”, â€”NRâ€”COâ€”Oâ€” or â€”NRâ€” COâ€”-NR, where at least one of the groups Y3 and Y4 is â€”Oâ€”COâ€”Oâ€”, â€”Oâ€”COâ€”NR NRâ€”COâ€”Oâ€” or â€”NRâ€”COâ€”NRâ€”, and R is C1-C4-Alkyl; A1 and A2, independently of one another, are a spacer having 2 to 30 carbon atoms, in which the carbon chain may be interrupted by ether oxygen, thioether sulfur or by non-adjacent imino or C1-C4-alkylimino groups; and, M is a mesogenic group selected from the group consisting of where each ring can carry up to three identical or different substituents selected from the group consisting ofC1-20-alkyl, C1-20-alkoxy, C1-20-alkoxycarbonyl, C1-20-monoalkylaminocarbonyl, C1-20-alkylcarbonyl, C1-20-alkylcarbonyloxy, C1-20-alkylcarbonylamino, formyl, halogen, hydroxyl and nitro; in combination with at least one chiral compound of formula Ie (Z1â€”Y1-A1Y3â€”Mâ€”Y4)nXâ€ƒâ€ƒ(Ie), wherein the variables A1, Z1, Y1, Y3, Y4 and M are as defined above, n is a number ranging from 1 to 6 and x is an n-valent chiral radical, where the optical element has color- and polarization-selective reflection properties.