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Photochromic spirooxazine monomers and polysiloxanes

  • US 5,473,068 A
  • Filed: 02/17/1994
  • Issued: 12/05/1995
  • Est. Priority Date: 02/19/1993
  • Status: Expired due to Term
First Claim
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1. A photochromic compound of the formula:

  • ##STR9## wherein R1 is selected from the group consisting of (A) hydrogen, alkyl, phenyl, benzyl, or an alkyl substituted by halogen, hydroxy, lower alkoxy, carboxyl, lower alkoxycarbonyl, and phenyl and benzyl substituted by cyano or by one or more halogens; and

    (B) (CH2)n --CH═

    CH2 wherein n is an integer from 1 to 20;

    when R1 is (B), then R2 through R8 are each selected from the group consisting of hydrogen, lower alkyl, and lower alkyl including substitutions from the group consisting of halogen, hydroxy, and lower alkoxy;

    when R1 is (A) then one of R2 through R8 is (C) --X--(CH2)n --CH═

    CH2, wherein n is an integer from 4 to 20 and X is selected from the group consisting of a covalent bond, O, N--R'"'"', (wherein R'"'"' is H or lower alkyl), CO--O, CO--NH, and --CH═

    N and the remaining ones of R2 through R8 are selected from the group consisting of hydrogen, alkyl, and alkyl substituted by halogen, hydroxy and lower alkoxy; and

    R9 and R10 form a condensed benzene or pyridine ring.

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