Use of starch dispersions as binder in coating compositions and process for preparing the starch dispersions
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United States of America Patent
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Nov 30, 2004
Grant Date -
Jan 22, 2004
app pub date -
Jul 23, 2003
filing date -
Jul 24, 2000
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Abstract
Coating compositions comprising a pigment and starch dispersion of discrete crosslinked starch particles in an aqueous liquid. The dispersion may be used as coating color for paper. A preferred process of preparing the dispersion of starch particles comprises (a) obtaining a mixture of starch and an aqueous liquid; (b) processing the mixture using shear forces in the presence of a crosslinker in an extruder; and (c) injecting a hydroxylic liquid into the extruder and dispersing the mixture inside the extruder or outside the extruder or both inside and outside the extruder to obtain the dispersion.
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