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Liquid crystal droplets dispersed in thin films of UV-curable polymers

  • US 4,728,547 A
  • Filed: 11/21/1986
  • Issued: 03/01/1988
  • Est. Priority Date: 06/10/1985
  • Status: Expired due to Term
First Claim
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1. An optically responsive film comprising birefringent nematic and/or brirefringent chiral nematic liquid crystal microdroplets dispersed in a film of the ultraviolet radiation cured reaction product of a polyallyl compound and a polythiol taken from the group consisting of Z[OCO(CH2)n SH]m, where Z=a polyvalent organic moiety which is the CH0-3 group containing nucleus of a tri- or tetravalent alcohol of the type of glycerol or pentaerythritol, m=3 or 4and n=1 to 5, said microdroplets displaying positive dielectric anisotropy and/or positive diamagnetic anisotropy, said film being capable of undergoing repeated thermally and electrically or magnetically induced transitions between opaque and transparent.

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