Title:
CEMENT ADDITIVE
Document Type and Number:
WIPO Patent Application WO/2021/117340
Kind Code:
A1
Abstract:
The present invention provides a cement additive that is capable of improving the fluidity retention of cement and reducing the viscosity of cement. The present invention is a cement additive containing a polycarboxylic-acid-based copolymer, the cement additive being characterized in that the polycarboxylic-acid-based copolymer contains structural units (a) derived from a polyalkylene-glycol-based monomer (A) represented by formula (1), structural units (b) derived from an unsaturated monocarboxylic-acid-based monomer (B), and structural units (c) derived from a carboxylic acid hydroxyalkyl ester (C) in respective proportions of 50-99 mass%, 1-30 mass%, and 0-20 mass% relative to 100 mass% of all structural units.
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Inventors:
KAWAI HAJIME (JP)
YOKOYAMA YUKI (JP)
YOKOYAMA YUKI (JP)
Application Number:
PCT/JP2020/039084
Publication Date:
June 17, 2021
Filing Date:
October 16, 2020
Export Citation:
Assignee:
NIPPON CATALYTIC CHEM IND (JP)
International Classes:
C04B28/04; C04B24/26; C08F216/16; C08F220/02; C08F220/04
Foreign References:
| JP2011525936A | 2011-09-29 | |||
| JP2011084459A | 2011-04-28 | |||
| JP2018123014A | 2018-08-09 | |||
| JP2009173527A | 2009-08-06 |
Attorney, Agent or Firm:
YASUTOMI & ASSOCIATES (JP)
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