MODIFIED STARCH COMPOSITIONS

摘要

A modified starch composition is made by combining a starch with a polymer and cooking the combined starch and polymer composition under acidic conditions, the cooking producing anionic groups on the polymer. Another modified starch composition is made by cooking a starch and combining the cooked starch with a cooked polymer, the cooking producing anionic groups on the polymer, and the polymer having been cooked separately from the starch. The compositions may be used as clarifying aids for removing solids and other suspended materials from aqueous dispersions, and in particular as retention aids in the manufacture of paper.