Novel compositions and processes
AssigneeSterling Drug Inc.
InventorJohn W. Delaney
Life of this patent
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Abstract
Stable, concentrated, free-flowing aqueous dispersion compositions containing one or more colorless dyestuff precursors and one or more surface active agents, are useful in the manufacture of paper for pressure sensitive carbonless duplicating manifold systems and thermal marking systems.
Claims44
A storage-stable concentrated free-flowing aqueous dispersion composition consisting essentially of by weight of the entire composition approximately 2.5 to approximately 50 percent of at least one colorless carbonless duplicating dyestuff precursor selected from the group consisting of phthalides, phenothiazines, fluorans, arylsulfonylmethanes, furopyridinones and furopyrazinones;
- approximately 0.1 to approximately 30 percent of at least one surface active agent selected from the group consisting of anionic surface active agents, nonionic surface active agents, cationic surface active agents and amphoteric surface active agents;
- and water;
- said composition optionally containing one or more of the following by weight of the entire composition:
- no more than 10 percent of a glycol selected from the group consisting of ethylene glycol, propylene glycol, diethylene glycol and ethylene glycol monoethyl ether;
- and no more than 3 percent of an alkaline substance selected from the group consisting of triethanolamine, sodium carbonate and potassium carbonate.
Dependencies are inferred from the claim text.