Monomers and their use for the production of a laser-optical rec

Details Monomers and their use for the production of a laser-optical rec Monomers and their use for the production of a laser-optical rec

1991-12-30

1993-05-18

Bowers, Jr., Charles L.

Radiation imagery chemistry: process, composition, or product th

Liquid crystal process, composition, or product

430495, 430945, 430 19, 428 1, 359104, G11B 724

Patent

active

052120279

ABSTRACT:
Novel laser-optical recording elements which can be repeatedly erased and recorded on contain recording layers (a) which exhibit enantiotropic, ferroelectric smectic liquid crystalline (S.sub.c*) behavior, so that they can be switched back and forth between two thermodynamically stable, optically distinguishable ferroelectric smectic liquid crystalline S.sub.c* order states on exposure to a laser beam of sufficient luminous power, by applying an external electric field. The recording layers (a) themselves consist mainly or exclusively of novel polymers P having chiral mesogenic side groups. The novel polymers P are prepared using the novel monomers of the general formula I ##STR1## where R is hydrogen, chlorine or methyl, A is a flexible space-maintaining long-chain molecular moiety, and C is an optically active chiral molecular moiety and B is a mesogenic molecular moiety composed of at least three aromatic nuclei which are bonded linearly or virtually linearly to one another,
or they are prepared using the novel monomers I which contain specially selected molecular moieties B in a novel combination with selected molecular moieties C.

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