| US 7,468,400 B2 | ||
| Aqueous glittering ink composition | ||
| Yasuyuki Yoshimura, Ibaraki (Japan); Naoshi Murata, Osaka (Japan); Yuki Yamamoto, Yamatokoriyama (Japan); and Tomohiro Sawa, Osaka (Japan) | ||
| Assigned to Sakura Color Products Corporation, Osaka-shi (Japan) | ||
| Filed on Dec. 17, 2004, as Appl. No. 11/16,368. | ||
| Application 11/016368 is a continuation of application No. 09/523619, filed on Mar. 13, 2000, abandoned. | ||
| Claims priority of application No. 11-076868 (JP), filed on Mar. 19, 1999; application No. 11-360187 (JP), filed on Dec. 20, 1999; application No. 2000-002344 (JP), filed on Jan. 11, 2000; and application No. 2000-002370 (JP), filed on Jan. 11, 2000. | ||
| Prior Publication US 2005/0159505 A1, Jul. 21, 2005 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. C09D 11/18 (2006.01); C08K 9/02 (2006.01); C08K 3/40 (2006.01) | ||
| U.S. Cl. 523—161 [523/216; 523/217; 524/493; 524/494; 106/31.6; 106/31.65; 106/31.85; 106/31.9] | 7 Claims |
| 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.
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