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Title:
PAPERMAKING METHOD FOR NEUTRAL NEWSPRINT PAPER
Document Type and Number:
Japanese Patent JP3791349
Kind Code:
B2
Abstract:

PROBLEM TO BE SOLVED: To provide a method for producing neutral newsprint paper using a paper stock containing a filler consisting mainly of calcium carbonate through an efficient papermaking process under neutral to weakly alkaline conditions in high yield with minimal pitch troubles.
SOLUTION: This method for producing neutral newsprint paper comprises incorporating a paper stock prior to papermaking with (A) a cationic water-soluble polymer and/or polycondensate-based cationic substance and making a treatment and then adding (B) an anionic water-soluble polymer to the system followed by conducting a papermaking operation; wherein it is preferable that the anionic water-soluble polymer is in the form of polymeric microparticles ≤100 μm in size and produced by dispersion polymerization process in an aqueous salt solution in the presence of a polymeric dispersant soluble to the aqueous salt solution.


Inventors:
Hidetoshi Sakamoto
Application Number:
JP2001158259A
Publication Date:
June 28, 2006
Filing Date:
May 28, 2001
Export Citation:
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Assignee:
Hymo Co., Ltd.
International Classes:
C08F2/10; D21H21/10; C08F220/06; C08F220/34; C08F220/56; C08F220/60; C08F226/04; D21H17/43; D21H17/45; (IPC1-7): D21H21/10; C08F2/10; C08F220/06; C08F220/34; C08F220/56; C08F220/60; C08F226/04; D21H17/43; D21H17/45
Domestic Patent References:
JP9250095A
JP10212320A
JP2105809A
JP60185900A