Viscosity suppression of associative thickeners using organophosphates

摘要

The viscosity of solutions of nonionic synthetic associative thickeners is controlled by adding organophosphates to the solution of associative thickeners. The associative thickeners are hydrophobically modified polymers and the organophosphates include one or more hydrophobic groups.

主权项

1. An associative thickener composition comprising:
1) a water dispersible polymer modified with a first hydrophobic group; and 2) a low VOC organophosphate represented by one or both of the following formulas:wherein M represents a counter cation, x and y are 0-12, R1 is chosen as the same as said first hydrophobic group, and R2 is selected from the group consisting of said first hydrophobic group and a second hydrophobic group with 19 or less carbon atoms, andwherein the water dispersible polymer modified with said first hydrophobic group is selected from the group consisting of hydrophobically modified ethylene oxide urethane (HEUR) block copolymers, aminated HEURs, hydrophobically modified polyacetal polyethers (HM-PAPEs), hydrophobically modified aminoplast polyethers, hydrophobically modified polyacrylates and polymethacrylates (HM-PA and HM-PMA), hydrophobically modified polysaccharides, and combinations thereof, andwherein an aqueous solution or dispersion of said associative thickener composition has a lower viscosity than an aqueous solution or dispersion of said water dispersible polymer without said low VOC organophosphate.