Process for controlling the density, conformation and composition of the hydrophilic layer of a polyurethane composite

摘要

A process of making a foam composite of desired pore size and conformation is provided. An emulsion of a hydrophilic polyurethane prepolymer which upon curing forms a substantially open cell hydrophilic polyurethane polymer foam is prepared and contacted with an open cell hydrophobic polyurethane foam having a plurality of surfaces defining a plurality of pores. The hydrophilic polyurethane prepolymer emulsion is then cured while by contacting with a gas at elevated temperature for a period of time sufficient to form a coating of substantially open cell hydrophilic polyurethane polymer foam on the hydrophobic polyurethane foam.