Arylazo and poly(arylazo) dyes having at least one core radical selected from naphthyl or anthracyl and having at least one 2,3-dihydro-1,3-dialkyl perimidine substituent
AssigneeHercules Incorporated
InventorsRobert P. Grasso, Michael K. O'Brien, Paul J. Shannon
Life of this patent
Estimating the term…
Abstract
Arylazo and poly(arylazo) dyes having at least one core radical selected from naphthyl or anthracyl and having at least one 2,3-dihydro-1,3-dialkyl perimidine substituent, a guest-host composition comprising a liquid crystal host solvent and the arylazo or poly(arylazo) dichroic dye, and a liquid crystal display comprising the guest-host composition, are disclosed.
Claims17
An arylazo or poly(arylazo) dichroic dye having (a) one to five arylazo groups wherein the aryl radicals are selected from the group consisting of napththyl, anthracyl and phenyl radicals, and at least one aryl radical is a naphthylor anthracyl radical, and (b) having at least one 2,3-dihydro-1,3-dialkyl perimidine substituent.
Dependencies are inferred from the claim text.