Title:
DISPERSANT FOR CALCIUM CARBONATE AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2012/008294
Kind Code:
A1
Abstract:
Provided is a dispersant for calcium carbonate with which the initial viscosity of a calcium carbonate slurry obtained by wet grinding is low and furthermore a marked rise in viscosity over time is prevented, and also provided is a method for producing the dispersant for calcium carbonate. The dispersant for calcium carbonate contains an acrylic polymer having a weight-average molecular weight between 4,500 and 8,500 that is obtained by: a polymerization step in which a monomer comprising acrylic acid is polymerized at a reaction temperature between 68 and 82ºC in the presence of 1.4 to 4.4 parts by mass of a hypophosphite and 0.3 to 1.5 parts by mass of a persulfate per 100 parts by mass of the monomer, using an isopropyl alcohol aqueous solution as a solvent; and a neutralization step in which 15 to 95 mol% of carboxyl groups having structural units derived from the monomer comprising the resulting polymer are neutralized.
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Inventors:
FUJIWARA MASAHIRO (JP)
Application Number:
PCT/JP2011/064687
Publication Date:
January 19, 2012
Filing Date:
June 27, 2011
Export Citation:
Assignee:
TOAGOSEI CO LTD (JP)
FUJIWARA MASAHIRO (JP)
FUJIWARA MASAHIRO (JP)
International Classes:
C09K23/52; C08F2/10; C08F6/00; C09D17/00
Foreign References:
| JP2001087640A | 2001-04-03 | |||
| JPH11128715A | 1999-05-18 | |||
| JP2000038491A | 2000-02-08 |
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Claims: