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AssigneeSpectra Group Limited, Inc.
InventorsOleg V. Grinevich, John H. Malpert, Alexandre Mejiritski, Douglas C. Neckers
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Selectively colorable polymerizable compositions and a method for forming selectively colored polymeric bodies using such compositions are disclosed. In accordance with the invention, a selectively colorable polymerizable composition comprising both a leucobase color former and a leuconitrile color former is irradiated with light of a particular wavelength and specific intensity for a specified duration. Exposure to actinic radiation cures the composition and activates the color formers. The irradiation dosage can be varied to selectively color the polymeric body whereby the resultant color of any particular area depends on the exposure dose received at that location. By varying the dose, a polymeric body can be prepared having distinctly colored elements at specific locations.
A composition which can be selectively colored by exposure to actinic radiation which comprises an oxidizing agent, a first color former which yields a first dye cation upon exposure in the presence of the oxidizing agent, and a second color former which yields a second dye cation and a leaving group by heterolysis, wherein said first dye cation is bleached by further radiation in the presence of said second color former.
A method comprising the steps of:
Dependencies are inferred from the claim text.