Erasable display medium

Details Erasable display medium Erasable display medium

1995-06-01

1997-04-15

Ryan, Patrick

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

25229901, 25229965, 25229963, 349198, B32B 900

Patent

active

056207816

ABSTRACT:
An erasable display medium comprising a substrate having thereon at least one liquid crystal polymer layer comprising a side chain type liquid crystal polymer which repeatedly and reversibly switches from a transparent state and a light-scattered state by the action of at least one of heat, an electrical field, and a magnetic field is disclosed, said side chain type liquid crystal polymer being a copolymer comprising a repeating unit represented by formula (I): ##STR1## and a repeating unit represented by formula (II): ##STR2## or a copolymer comprising a repeating unit represented by formula (III): ##STR3## and a repeating unit represented by formula (IV): ##STR4## wherein R.sup.a and R.sup.b each represent a hydrogen atom, a methyl group, or a halogen atom; A, D, and E each represent a specific liquid crystal molecule residue; B represents a group composed of one or more of a hydroxyl group, a halogen atom, an alkyl group, an alkenyl group, a substituted or unsubstituted phenyl group, a heterocyclic group, an amino group, a cyano group, --COOR.sup.2, --OCOR.sup.2, and --CONR.sup.2 R.sup.3, wherein R.sup.2 and R.sup.3 each represent a hydrogen atom, an alkyl group having from 1 to 30 carbon atoms which may be substituted with a halogen atom or a heterocyclic group, an alkenyl group, an alicyclic group, a hydroxyalkyl group, a hetero atom-containing alkyl group, or a substituted or unsubstituted phenyl group; and k, m, and n each represent an integer of from 1 to 30.

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