Back to results
US 6,666,897 B2Granted
Black alcohol soluble dye formulation
OwnerAlejandro Zimin, Sr., Michael R. Friswellinventors
Life of this patent
Estimating the term…
Abstract
The present invention relates to black alcohol soluble dye formulations of high color intensity, low viscosity, and high tinctorial strength. The formulations are particularly useful for writing instruments such as felt tip and roller ball pens.
Claims17
A black, alcohol soluble dye composition comprising:
- a) from 20 to 45 percent, by weight, of a propanol solvent selected from n-propanol, isopropanol, or a mixture thereof;
- b) from 30 to 35 percent, by weight, of Nigrosine Base;
- c) from 20 to 40 percent, by weight, of one or more (C7-C20) straight or branched chain, saturated or unsaturated carboxylic acids;
- d) from 1 to 6 percent, by weight of a dye selected from the group consisting of C.I. Solvent Brown 12 dye;
- a yellow dye having the formula:
- wherein each R is independently a (C6-C12) alkyl;
- and mixtures thereof;
- and
- e) from 1 to 3 percent, by weight, of a Violet Base selected from the group consisting of Crystal Violet Base, Methyl Violet Base, or mixtures thereof.
6 more elements
Dependencies are inferred from the claim text.