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Light modulating film of improved UV stability for a light valve

  • US 5,728,251 A
  • Filed: 09/27/1995
  • Issued: 03/17/1998
  • Est. Priority Date: 09/27/1995
  • Status: Expired due to Term
First Claim
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1. A method of preparing an SPD light valve having opposed cell walls and an SPD light film between said cell walls, the SPD light valve film comprising a cross-linked polymer matrix having droplets of a liquid light valve suspension distributed in the cross-linked polymer matrix, the method comprising:

  • (a) casting on a first substrate a layer of a film-forming liquid or semi-solid emulsion comprising a cross-linkable polymer, a cross-linking agent, a catalyst and a liquid light valve suspension, said liquid light valve suspension comprising particles suspended in a liquid suspending medium, said layer having a first surface in contact with said first substrate and an uncovered, opposed second surface;

    (b) cross-linking and curing said cross-linkable polymer in said layer by reaction with said cross-linking agent in the presence of said catalyst while said second surface of said layer remains uncovered to form a cured SPD light valve film comprising a cross-linked polymer matrix having droplets of the liquid light valve suspension distributed therethrough, said cured SPD film having one surface in contact with said first substrate, and an uncovered, opposed second surface, said cured SPD film being unswollen by any swelling liquid;

    (c) covering said uncovered surface of said cured and unswollen SPD light valve film with a second substrate;

    (d) laminating said substrates to said SPD light valve film; and

    (e) providing each of said substrates with an electrode before or after said lamination step.

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