| 摘要 |
PURPOSE:To contrive improvement of dispersibility simply by carrying out chemical reaction, by subjecting a melaminesulfonic acid formalin polycondensate or a salt thereof to oxidative polymerization at a specific pH and constituting the dispersing agent from the resultant product having a specified molecular weight distribution breadth. CONSTITUTION:This dispersing agent consists of a product, obtained by subjecting melaminesulfonic acid formalin polycondensate or a salt thereof to oxidative polymerization reaction at pH>=7 to and having 6-2mol.wt. distribution breadth expressed by the ratio (Mw/Mn) of the weight-average molecular weight (Mw) to the number-average molecular weight (Mn). A reaction technique accompanied by electron transfer can be normally applied to the above- mentioned oxidative polymerization reaction. For example, a reaction with a peroxide, ozone, light, etc., can be used. The value of the molecular weight distribution breadth can be regulated to a narrow value and the molecular weight can be regulated to a value useful for dispersibility without carrying out fractionating operation.
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