| US 7,485,406 B2 | ||
| Photostorage solid drawing medium | ||
| Hidetoshi Fukuo, Osaka (Japan); Masamitsu Takahashi, Osaka (Japan); and Kotaro Sumitomo, Osaka (Japan) | ||
| Assigned to Sakura Color Products Corporation, Osaka (Japan) | ||
| Filed on Apr. 07, 2006, as Appl. No. 11/399,543. | ||
| Application 11/399543 is a continuation in part of application No. 10/980336, filed on Nov. 04, 2004, abandoned. | ||
| Claims priority of application No. 2003-378466 (JP), filed on Nov. 07, 2003; application No. 2003-378485 (JP), filed on Nov. 07, 2003; application No. 2003-390820 (JP), filed on Nov. 20, 2003; and application No. 2003-390952 (JP), filed on Nov. 20, 2003. | ||
| Prior Publication US 2006/0210924 A1, Sep. 21, 2006 | ||
| Int. Cl. G03F 7/00 (2006.01) | ||
| U.S. Cl. 430—270.1 [430/139; 430/494; 430/905] | 10 Claims |
| 1. A photostorage solid drawing medium having a gel hardness of 2-50 kg/cm2 which comprises 20-80% by weight of a solvent consisting essentially of water and a water-soluble organic solvent, 1-40% by weight of a resin soluble in the solvent, 2-40% by weight of at least one gelling agent selected from the group consisting of an aliphatic carboxylic acid, its salt, N-fatty acid acylamino acid and its salt, and 5.0-50.0% by weight of a photostorage pigment, each based on the weight of the photostorage solid drawing medium, wherein the photostorage pigment comprises a long afterglow fluorescent substance comprising an alkaline earth aluminosilicate as a matrix activated with a rare earth element wherein the alkaline earth element is at least one selected from the group consisting of strontium, calcium, magnesium and barium. |