DISPERSING AGENT FOR GYPSUM

摘要

PROBLEM TO BE SOLVED: To offer a dispersing agent for gypsum with the small amount of water used, therefore which can grant sufficient flowability with the small amount used even for the gypsum slurry in low water/gypsum ratio. SOLUTION: It is provided with the water-soluble vinyl copolymer of the weight-avarage molecular weight 1,000-100,000 obtained by copolymerizing 1 sort of specific vinyl monomer having in its molecule the polyoxyalkylene group which is composed of a oxyethylene unit and a oxypropylene unit and two other sorts of specific vinyl monomers in the specified ratio respectively.