Title:
【発明の名称】劣化を防止した紙
Document Type and Number:
Japanese Patent JP2647306
Kind Code:
B2
Abstract:
A permanent paper is disclosed which employs as a stock pulp slurry containing at least one kind of filler, and aluminum sulfate, a hydrophobic modified rosin emulsion sizing agent and a water-soluble alkaline salt, wherein the pH where said filler is dispersed in water to form 10% of a dispersion is 4 - 8, the pH of said pulp slurry is controlled within 6.5 - 7.5 and an alkaline salt of an acid having a pKa of 5 - 14 at a 25 DEG C aqueous solution is coated onto said paper and the pH of the coated paper extract in cold water is 7.5 - 9.0.
Inventors:
KUROYAMA YOSHIHIRO
INOE YOSHUKI
ISHIKAWA SUSUMU
IIMORI YOSHIFUMI
INOE YOSHUKI
ISHIKAWA SUSUMU
IIMORI YOSHIFUMI
Application Number:
JP18119592A
Publication Date:
August 27, 1997
Filing Date:
July 08, 1992
Export Citation:
Assignee:
NIPPON SEISHI KK
International Classes:
D21H17/62; D21H17/64; D21H19/00; D21H21/16; G03G7/00; (IPC1-7): D21H19/00; D21H17/62; D21H17/64; G03G7/00
Domestic Patent References:
| JP5273695A | ||||
| JP616392A | ||||
| JP57205595A |
Attorney, Agent or Firm:
Kyozo Yuasa (6 people outside)