Patent ID: 7468400
Filing Date: 2008-12-23
Classification: C09D

Abstract:
1. An aqueous ink for a handheld writing instrument, comprising: 0.01 to 40 wt % of a glass flake pigment having a median diameter of 5-100μm; 0.01 to 40 wt % of a water soluble thickening resin, the amount being sufficient for dispersing the glass flake pigment in the aqueous ink; 1 to 40 wt % of a water-soluble organic solvent selected from the group consisting of glycols, polyhydric alcohols and glycol ethers; and water, wherein the glass flake pigment contains glass flakes coated with a coating consisting of silver, the glass flakes having a surface smoothness such that a glittering and spatial effect are present in a mark formed by the ink; 0.01 to 30 wt % of a colorant selected from the group consisting of an inorganic pigment, an organic pigment and a synthetic resin, the colorant being free from an influence of the color development of the glass flake pigment; 0.3 to 20 wt % in solids of a synthetic resin emulsion as a binder component for the glass flake pigment coated with silver, the synthetic resin emulsion having a minimum film-forming temperature not greater than 20° C; and wherein the water-soluble thickening resin is selected from polysaccharides or N-vinylacetamide resin.