An environmentally preferred flock adhesive composition containing low molecular
weight prepolymers of isocyanate terminated polyether and/or polyalkadiene polyols
is disclosed. The prepolymers are free of residual volatile isocyanate (<1000 ppm)
without blocking the isocyanate thereby providing favorable effects on viscosity,
cure kinetics, and safety. The flock adhesive composition preferably contains an
aromatic nitroso compound an epoxy novolak resin and a catalyst. The adhesive compositions
can be made at high solids, with minimal co-solvent, while maintaining low viscosity,
which is favorable to environmental regulations aimed at reducing solvent emissions.
Furthermore, the solvents can be non-HAP and non-photochemically reactive. The
adhesive composition can be utilized for the application of flocking fibers to
various elastomer substrates.
