NONIONIC AQUEOUS POLYURETHANE DISPERSIONS AND PROCESSES FOR MAKING SAME

摘要

The invention is directed to a process for preparing aqueous polymeric dispersions comprising a dispersion of an interpenetrated polymer of a hydrophobic polyurethane and a polymer prepared from one or more ethylenically unsaturated monomers and optionally a dispersion of a polymeric performance enhancer comprising the steps of providing a mixture of polyurethane prepolymer and one or more ethylenically unsaturated monomers, dispersing the mixture with water, optionally containing polyamines, in the presence of dispersing aids until a phase inversion occurs, and then polymerising the ethylenically unsaturated monomer or monomers using conventional free radical vinyl-additi on polymerization techniques. The ethylenically unsaturated monomers maybe substantially hydrophobic and the polyamines preferably are diamines.