Manufacturing Industry
Pigment stabilization through mixed associative thickener interactions.
Journal of Coatings Technology, The, April, 1992 by Glass, J. Edward; Lundberg, David J.
The role of associative thickeners in the development of latex coating film gloss is examined. The classical explanation relating film gloss to flow and leveling through low viscosities at low shear rates is found invalid in associated thickener formulations. Increases in gloss arise from improved stabilization of titanium dioxide [TiO.sub.2] particles. This requires two separate interactions: (1) the efficient adsorption of hydrophobe-modified maleic and alternating copolymer on the surface of [TiO.sub.2] through hydrogen bonding or an acid-base interaction, and (2) interactions of the hydrophobes of this copolymer with the hydrophobes of ethoxylated urethane (HEUR) thickeners. This interaction provides greater electrosteric stabilization to the pigment, improved...
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