| 摘要 |
PURPOSE:To avoid the formation of a hard cake during long-term preservation, by preparing an aqueous dispersion stabilizer containing a salt of a graft copolymer of a formaldehyde condensate of naphthalenesulfonic acid, acrylic acid, etc. as a useful component. CONSTITUTION:A formaldehyde condensate of naphthalenesulfonic acid which may contain an alkyl substituent is reacted with acrylic acid, methacrylic acid or a mixture thereof in the presence of a polymerization initiator to form a salt of a graft polymer which is, in turn, used as a useful component to prepare an aqueous dispersion stabilizer for a fine powder. The amount of the formaldehyde condensate of naphthalenesulfonic acid is pref. 0.1-50pts.wt. of 1pt. of acrylic acid, methacrylic acid or the mixture thereof. As the polymerization initiator, peroxide is pref.
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