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Light valve for controlling the transmission of radiation comprising a cell and a stabilized liquid suspension

  • US 4,164,365 A
  • Filed: 08/10/1978
  • Issued: 08/14/1979
  • Est. Priority Date: 07/31/1972
  • Status: Expired due to Term
First Claim
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1. A light valve for controlling the transmission of radiation, which comprises a cell and a liquid suspension in said cell;

  • said liquid suspension comprising;

    an electrically resistive liquid suspending medium;

    a plurality of small, anisometrically shaped, light-polarizing, halogen-containing particles suspended in said suspending medium; and

    a copolymer of at least two different monomers;

    at least one of said monomers having a sterically unhindered functional group selected from the group consisting of an OH group and an acidic group, and at least one of said monomers having a branched group, the distance from the backbone of the copolymer to said sterically unhindered functional group most distant from the backbone being less than the distance from the backbone to the terminal group of said branched group, the branched groups in said copolymer being sufficiently soluble so that the copolymer as a whole is substantially dissolved in said liquid suspending medium.

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