AQUEOUS POLY(METH)ACRYLIC ACID (SALT) SOLUTION AND PROCESS FOR PREPARING SAME

Title:

AQUEOUS POLY(METH)ACRYLIC ACID (SALT) SOLUTION AND PROCESS FOR PREPARING SAME

Document Type and Number:

WIPO Patent Application WO/2012/086716

Kind Code:

A1

Abstract:

The purpose of the present invention is to provide an aqueous poly(meth)acrylic acid (salt) solution which exhibits excellent dispersing properties for inorganic matter and dispersing properties with sufficient long-term stability. The present invention pertains to: an aqueous poly(meth)acrylic acid (salt) solution which contains a poly(meth)acrylic acid (salt) that is obtained by polymerization in the presence of a phosphorus compound including hypophosphorous acid (salt) and that has a weight-average molecular weight of 1000 to 10000, wherein the phosphorus compound has a phosphorous acid (salt) content of 0 to 0.3% by mass relative to 100% by mass of the phosphorus compound, and the inorganic anion content is 0 to 10000ppm; a process for preparing the aqueous poly(meth)acrylic acid (salt) solution, comprising a step characterized by polymerizing a monomer in an aqueous medium in the presence of a phosphorus compound including hypophosphorous acid (salt); a dispersant obtained by the process; and a dispersion of inorganic particles which contains at least 70% by mass of inorganic particles and which is produced by a process comprising a step of adding the aqueous poly(meth)acrylic acid (salt) solution to inorganic particles and then subjecting the resulting mixture to pulverization.

Inventors:

WAKAO NORIHIRO (JP)
KANZAKI AKIHIKO (JP)
CHOSA JUNICHI (JP)

Application Number:

PCT/JP2011/079708

Publication Date:

June 28, 2012

Filing Date:

December 21, 2011

Export Citation:

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Assignee:

NIPPON CATALYTIC CHEM IND (JP)
WAKAO NORIHIRO (JP)
KANZAKI AKIHIKO (JP)
CHOSA JUNICHI (JP)

International Classes:

C08F20/06; C08F2/38; C08K3/00; C08L33/02; C09C3/04; C09C3/10; C09D7/45; C09D17/00; C09K23/52

Domestic Patent References:

WO2011158945A1

2011-12-22

Foreign References:

JPH06287208A	1994-10-11
JPH03121101A	1991-05-23
JPH101512A	1998-01-06
JPH06263803A	1994-09-20
JP2009242598A	2009-10-22
JP2000281959A	2000-10-10
JP2000198809A	2000-07-18
JPH11241066A	1999-09-07
JP2002179704A	2002-06-26
JP2009522189A	2009-06-11
JPH03121101A	1991-05-23
JP2000080396A	2000-03-21

Other References: