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:
Jan. 08, 2013
Filed:
Jan. 16, 2008
Kazunari Sakai, Kakogawa, JP;
Tomohiko Nakata, Kakogawa, JP;
Yoshiharu Hashiguchi, Kakogawa, JP;
Takashi Yamaguchi, Tokyo, JP;
Masaki Ito, Tokyo, JP;
Yasunobu Ooka, Tokyo, JP;
Kazunari Sakai, Kakogawa, JP;
Tomohiko Nakata, Kakogawa, JP;
Yoshiharu Hashiguchi, Kakogawa, JP;
Takashi Yamaguchi, Tokyo, JP;
Masaki Ito, Tokyo, JP;
Yasunobu Ooka, Tokyo, JP;
Harima Chemicals, Inc., Hyogo, JP;
Nippon Paper Industries Co., Ltd., Tokyo, JP;
Abstract
To effectively impart sizing performance to paper, while reducing the amounts of an internal sizing agent and aluminum sulfate, a papermaking additive comprises a mixture of an amphoteric copolymer having a hydrophobic group whose quaternization ratio is 40% by mole or more, and in which the ratio of the anion equivalent to the cation equivalent is 0.1 to 90%, and a calcium carbonate filler. The filler is one in which suitable water repellency is imparted to the filler. Hence, by adding this to pulp slurry, followed by a wet papermaking, the filler is efficiently adsorbed onto pulp fibers having anionic property, so that effective sizing performance can be imparted to the paper by using a smaller amount thereof than the internal sizing agent, while reducing the amounts of the internal sizing agent and the aluminum sulfate.