Water-based pigment ink for writing utensil

Abstract

Abstract PURPOSE:To improve lubricity, dispersibility, etc., and to allow ink to be freed from the problems of blurring of the writing and agglomeration of pigment particles, by blending an org. phosphate ester with a water-based pigment ink for writing utensils, which contains a pigment, a dispersant, a water-soluble solvent, water, etc. CONSTITUTION:An inorg. or org. pigment (A), a dispersant (B) (e.g. polyvinyl alcohol or anionic surfactant), a water-soluble solvent (C) (e.g. ethylene glycol), water (D) and a lubricant (E) composed of an org. phosphate ester of the formula [wherein R is 4C or higher (un)saturated alkyl; n is 1-2; M is an alkali metal, ammonium, alkanolamine salt] to obtain the desired water-based pigment ink for writing utensile. Examples of component E are dioctyl phosphate monoethanolamine salt and oleyl phosphate ammonium salt. Component E is used in a quantity of 0.1-10wt% based on the entire quantity of the ink.

Inventors

• 👤 Takeshi Toyama
• 👤 武志 外山
• 👤 Hiromi Sano
• 👤 博美 佐野
• 👤 Denkichi Sasage
• 👤 捧　伝吉

Bibliographic Details