| 摘要 |
The present invention relates to a dispersion of particulate solid in a medi um containing water and at least one dispersing agent. In particular, the dispersing agent comprises a water soluble polymer (see formula I) wherein X is H, Na, K, Ca, Mg, NH4+ or A; and A is a polymer, copolymer or water soluble salt thereof, comprising one or more of the following monomers in polymerised form: (see formula II) wherein R1 is H, OH, C1 to C9 alkyl or alkoxy or acetoxy or acetate R2 is H, C1 to C3 alkyl or alkxy, COOR3 R3 is H, Na, K, or C1 to C10 alkyl; hydroxylpropyl acrylate, propyl methacrylate, 2-acrylamido-2-propane sulphon ic acid, sodium styrene sulphonate, sodium allylsulphonate, sodium methyl sulphonate, vinyl sulphonic acid, and salts thereof; acrylamide, methacrylamide, tert-butylacrylamide, (meth)acrylonitrile, styrene, vinyl acetate allyloxy-2-hydroxypropyl sulphonate and dialkylacrylamide; and further wherein A contains at least 10 monomers in polymerised form.</SD OAB> |
