| abstract |
A solvent suitable for use with the types of polyurethane-polyurea rheology modifiers previously formulated as solid or viscous liquids. The solvent of the present invention makes it possible to prepare and formulate a rheology modifier in the form of a liquid or solution more suitable for the manufacture of a coating formulation containing a polyurethane-polyurea rheology modifier. The solvent of the present invention is an aprotic, non-toxic N-alkyl substituted caprolactam containing N-methylcaprolactam, N-ethylcaprolactam, N-butylcaprolactam, and mixtures thereof, such as those found in polyurethanes and polyureas. It has good dissolving power for polar groups, is thermally stable, and has a high boiling point at low vapor pressure. |