Patent ID: 6365238
Filing Date: 2002-04-02
Classification: C09K

Abstract:
A chip card comprised of a ferroelectric liquid-crystal display, comprising a ferroelectric liquid-crystal layer, wherein the liquid-crystal layer consists of a mixture of low-molecular weight and polymeric or oligomeric liquid crystals, wherein the mixture contains 60 to 95% by weight of the low-molecular weight component, and wherein the polymeric liquid crystals are side chain polymers having a polyacrylate, polymethacrylate or polysiloxane main chain and side chains of the formula:wherein Z is selected from the group consisting of: D is a spacer group; and R1 is optically active and is a straight-chain or branched alkyl radical, with or without an asymmetrical carbon atom, having 1 to 20 carbon atoms, wherein: A) one or more non-adjacent and non-terminal â€”CH2â€” groups may be replaced by â€”Oâ€”, â€”Sâ€”, â€”COâ€”Oâ€”, â€”Oâ€”COâ€”, â€”OCOâ€”Oâ€” or â€”Si(CH3)2â€”, and/or B) one or more â€”CH2â€” groups may be replaced by â€”CH&boxH;CHâ€”, â€”CHâ‰¡CHâ€”, cyclopropane-1,2-diyl, 1,4-phenylene, 1,4-cyclohexylene or 1,3-cyclopentylene, and/or C) one or more H atoms may be replaced by F and/or Cl, and/or D) the terminal â€”CH3 group may be replaced by one of the following optically active or racemic chiral groups: â€ƒwherein R3, R4, R5, R6 and R7 are identical or different and are: 1) hydrogen, or 2) a straight-chain or branched alkyl radical, with or without an asymmetrical carbon atom, having 1 to 6 carbon atoms, wherein i) one or more non-adjacent and non-terminal â€”CH2â€” groups may be replaced by â€”Oâ€”, and/or ii) one or two â€”CH2â€” groups may be replaced by â€”CH&boxH;CHâ€”, and 3) R4 and R5 together may alternatively be â€”(CH2)4â€” or â€”(CH2)5â€” if they are bonded to an oxirane, dioxolane, tetrahydropyran, butyrolactone or valerolactone system.