METHOD FOR MANUFACTURING PAPERBOARD

WIPO Patent Application WO/2012/164916

A1

This invention is a method for manufacturing paperboard, the method having an exceptional paper-strength-improving effect and yield-improving effect, and the method being characterized in comprising adding a papermaking additive to a pulp slurry; the pulp slurry being used having a papermaking pH of 6.5-8.5 after the additive has been added; the papermaking additive being synthesized using a monomer (A) capable of forming the repeating unit represented by general formula (A) through polymerization, a cationic vinyl monomer (C) in an amount of 1-20 mol% relative to the total monomer content of the polymerization system, a (meth)allyl sulfonic acid and/or a salt thereof (D) in an amount of 0.01-5 mol% relative to the total monomer content of the polymerization system, and glyoxylic acid or a monomer (B) capable of forming the repeating unit represented by general formula (B) through polymerization; and the papermaking additive containing a polymer having a repeating unit expressed by general formula (B). In the formulae, R1 represents H or CH3, R2 represents H or CH3, and R3 represents H, Na, K, or NH4

SUZUKI HIROSHI (JP)
OHKAWA NORIKO (JP)
KUMEDA KAZUHIRO (JP)
OGUNI TADAYOSHI (JP)

PCT/JP2012/003509

December 06, 2012

May 29, 2012

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SEIKO PMC CORP (JP)
SUZUKI HIROSHI (JP)
OHKAWA NORIKO (JP)
KUMEDA KAZUHIRO (JP)
OGUNI TADAYOSHI (JP)

D21H21/10; C08F8/28; C08F220/56; C08F228/02; D21H17/37; D21H17/44

JP2000273790A	2000-10-03
JP2000008293A	2000-01-11
JP2007186821A	2007-07-26
JP2011236532A	2011-11-24
JP2007186822A	2007-07-26
JPS55155062A	1980-12-03
JPH10195798A	1998-07-28

FUKUMURA, Naoki et al. (JP)
Naoki Fukumura (JP)

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