US 7,476,448 B2
	Coating paper which can be removed by water and a method for preparation thereof
Junpei Natsui, Tokyo (Japan); Akihito Ogino, Tokyo (Japan); Hiroki Midorikawa, Tokyo (Japan); Yoshiaki Ishino, Shizuoka (Japan); and Yoshiteru Kanomata, Shizuoka (Japan)
Assigned to Nippon Paper Industries Co., Ltd., Tokyo (Japan); and Nippon Paper Papylia Co., Ltd., Shizuoka (Japan)
Filed on Mar. 21, 2006, as Appl. No. 11/385,295.
Claims priority of application No. 2005-082299 (JP), filed on Mar. 22, 2005; and application No. 2005-161596 (JP), filed on Jun. 01, 2005.
Prior Publication US 2006/0216537 A1, Sep. 28, 2006
Int. Cl. B32B 23/04 (2006.01)

U.S. Cl. 428—532  [428/533; 428/535; 428/536; 428/537.5; 427/322; 427/324; 427/326; 427/411; 427/415]

11 Claims

1. A water-removable coating paper comprising a substrate paper having a grammage of at least 50 g/m2 and comprising a water-decaying layer containing 30-60 wt. % of a water-insoluble, fibrous carboxyalkylcellulose, 40-70 wt. % of water-dispersible fibers beaten to a CSF value of from 550-650 ml, according to JIS-P8121, and an alkalizing agent and a water-based color coated on the substrate paper.