The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 03, 2009
Filed:
Mar. 15, 2005
Kazunari Soga, Tokyo, JP;
Dai Nagahara, Tokyo, JP;
Kazuyuki Fujita, Tokyo, JP;
Takashi Ochi, Tokyo, JP;
Koji Kutsuwa, Tokyo, JP;
Katsumasa Ono, Tokyo, JP;
Kazunari Soga, Tokyo, JP;
Dai Nagahara, Tokyo, JP;
Kazuyuki Fujita, Tokyo, JP;
Takashi Ochi, Tokyo, JP;
Koji Kutsuwa, Tokyo, JP;
Katsumasa Ono, Tokyo, JP;
Nippon Paper Industries Co., Ltd., Tokyo, JP;
Abstract
The present invention provides a low-density neutral paper offering excellent opacity, opacity after printing and other advantageous printability properties despite high bulk, by containing, as a filler, precipitated calcium carbonate-silica composite having an average particle size of 30 μm or less and produced by neutralizing a mixture of precipitated calcium carbonate and alkaline silicate to pH 7 to 9, wherein the ratio of precipitated calcium carbonate to silica (precipitated calcium carbonate/silica) is 30/70 to 70/30 in solid content by weight and the surface of precipitated calcium carbonate particles is covered with silica. In particular, the present invention provides a low-density printing paper, or an electrophotographic transfer paper offering excellent stiffness and copier suitability, by means of adjusting the filler content in paper to a range of 1 to 25 solid content percent by weight, or provides a neutral newsprinting paper by means of adjusting the filler content in paper to a range of 0.1 to 25 solid content percent by weight.