Color forming compositions and associated methods
AssigneeHewlett-Packard Development Company, L.P.
InventorsJayprakash C. Bhatt, Sundar Vasudevan
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Abstract
Compositions and methods for forming color images on a substrate capable of development at desired wavelengths or energy levels are disclosed and described. The color forming composition can include a carrier system and a latent pigment with a pendent group, wherein the latent pigment is colorless or pale in color while the pendent group is attached, and wherein the latent pigment is convertible to a colored pigment upon removal of the pendent group. Alternatively, the latent pigment can have multiple states of conjugation where the latent pigment is colorless or pale in a first conjugation state, and colored in a second conjugation state. The color forming compositions are useful in forming images on a wide variety of substrates, such as optical disks.
Claims26
A color forming composition, comprising:
- a) a carrier system comprising a polymer matrix;
- and
- b) a latent pigment having:
- i) a pendent group of N-3-(4-hydroxyphenyl)propionyl group, wherein the latent pigment is pale in color or colorless while the pendent group is attached, and wherein the latent pigment is convertible to a colored pigment upon removal of the pendent group;
- or
- ii) multiple conjugation states, wherein the latent pigment is pale in color or colorless in a first conjugation state, and wherein the latent pigment is convertible to a colored pigment in a second conjugation state
- wherein the color forming composition is capable of development using radiation at less than about 0.5 J/cm2 in less than about 1 millisecond.
A method of forming a color image on a substrate, comprising:
- a) positioning a substrate having a color forming composition coated thereon adjacent to a laser energy source, said color forming composition including:
- i) a carrier system comprising a polymer matrix;
- and
- ii) latent pigments each having:
- pendent groups of N-3-(4-hydroxyphenyl)propionyl group, wherein the latent pigments are colorless or pale in color while the pendent groups are attached, and wherein the latent pigments are convertible to colored pigments upon removal of pendent groups, or multiple conjugation states, wherein the latent pigments are pale in color or colorless in a first conjugation state, and wherein the latent pigments are convertible to colored pigments in a second conjugation state;
- and
- b) applying sufficient laser energy from the laser energy source to the color forming composition to develop the latent pigments in a portion of the color forming composition.
A color forming composition, comprising:
- a) a carrier system comprising a polymer matrix;
- and
- b) a latent pigment having a pendent group of N-3-(4-hydroxyphenyl)propionyl, wherein the latent pigment is pale in color or colorless while the pendent group is attached, and wherein the latent pigment is convertible to a colored pigment upon removal of the pendent group using a chemical oxidation reaction.
Dependencies are inferred from the claim text.