Title:
DISPERSANT FOR CALCIUM CARBONATE, AND PROCESS FOR CONTINUOUS PRODUCTION OF THE DISPERSANT
Document Type and Number:
WIPO Patent Application WO/2012/011368
Kind Code:
A1
Abstract:
The present invention relates to: a dispersant for calcium carbonate, which can produce a calcium carbonate slurry having a reduced initial viscosity by wet-grinding and can prevent the significant increase in viscosity of the slurry over time; and a process for continuously producing the dispersant. This dispersant for calcium carbonate is produced through a polymerization step and a neutralization step which are carried out sequentially, and is characterized in that the polymerization step comprises supplying a monomer comprising acrylic acid, an aqueous IPA solution, a hypophosphorous acid salt, a persulfuric acid salt and NaOH to a reactor continuously to polymerize the monomer continuously, and the IPA, the hypophosphorous acid salt, the persulfuric acid salt and sodium hydroxide are supplied in amounts of 15-100 parts by mass, 2.0-5.0 parts by mass, 0.5-2.0 parts by weight and 5.0-20 parts by mass, respectively, relative to 100 parts by mass of the monomer, the reaction temperature to be employed in the polymerization step is 68-82°C, and the degree of neutralization in the neutralization step is 15-95 mol%.
Inventors:
FUJIWARA Masahiro (C/O TOAGOSEI CO. LTD, 8, Showa-cho, Minato-ku, Nagoya-sh, Aichi 26, 〒4550026, JP)
藤原 正裕 (〒26 愛知県名古屋市港区昭和町８番地 東亞合成株式会社内 Aichi, 〒4550026, JP)
SATO Takefumi (C/O TOAGOSEI CO. LTD, 17-23, Showa-cho, Minato-ku, Nagoya-sh, Aichi 26, 〒4550026, JP)
藤原 正裕 (〒26 愛知県名古屋市港区昭和町８番地 東亞合成株式会社内 Aichi, 〒4550026, JP)
SATO Takefumi (C/O TOAGOSEI CO. LTD, 17-23, Showa-cho, Minato-ku, Nagoya-sh, Aichi 26, 〒4550026, JP)
Application Number:
JP2011/064729
Publication Date:
January 26, 2012
Filing Date:
June 28, 2011
Export Citation:
Assignee:
TOAGOSEI CO., LTD. (1-14-1, Nishi-Shimbashi Minato-k, Tokyo 19, 〒1058419, JP)
東亞合成株式会社 (〒19 東京都港区西新橋一丁目１４番１号 Tokyo, 〒1058419, JP)
FUJIWARA Masahiro (C/O TOAGOSEI CO. LTD, 8, Showa-cho, Minato-ku, Nagoya-sh, Aichi 26, 〒4550026, JP)
藤原 正裕 (〒26 愛知県名古屋市港区昭和町８番地 東亞合成株式会社内 Aichi, 〒4550026, JP)
東亞合成株式会社 (〒19 東京都港区西新橋一丁目１４番１号 Tokyo, 〒1058419, JP)
FUJIWARA Masahiro (C/O TOAGOSEI CO. LTD, 8, Showa-cho, Minato-ku, Nagoya-sh, Aichi 26, 〒4550026, JP)
藤原 正裕 (〒26 愛知県名古屋市港区昭和町８番地 東亞合成株式会社内 Aichi, 〒4550026, JP)
International Classes:
B01F17/52; C08F20/06; C08F2/44
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Claims: