Liquid crystal display and photopolymerizable sealant therefor

  • US 4,297,401 A
  • Filed: 12/26/1978
  • Issued: 10/27/1981
  • Est. Priority Date: 12/26/1978
  • Status: Expired due to Term
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First Claim
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1. An improved liquid crystal display cell comprising a pair of half-cells having portions thereof bonded together by organic seal means wherein the improvement comprises an organic seal means comprising a photopolymerized sealant comprising a polymerized mixture of:

  • (a) cationically polymerizable epoxide with a functionality of at least 1, and;

    (b) an organic aromatic onium catalyst comprising an aromatic adduct of(1) a diaromatic, triaromatic, or tetraaromatic organoatomic cation of a Group Va, VIa, or VIIa atom and(2) an anion;

    said onium catalyst being represented by the formula;

    ##STR5## wherein R2 is an aromatic group at least as electron withdrawing as benzene,R1 is an alkyl or alkenyl group,A is a Group Va, VIa, or VIIa atom,X is an anion,n is a positive whole integer of at least 2 up to the valence of A plus one,a is 0 or a positive whole integer up to the valence of A minus one, andn plus a is equal to the valence of A plus one and wherein at let two of said R2 groups are bonded to A;

    said photopolymerized sealant being chemically resistant to liquid crystal materials.

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