PACIFIC NORTHWEST
COATINGS PATENTS BASECOAT
Patent No. U.S. 6,849,338 B2
Pacific Northwest Coatings has
received a patent for a coating system
that is comprised of a basecoat of a
thermosetting asphalt extended, chemically
cross linked-urethane/epoxy
hybrid basecoat resting on a substrate
that off-gases when coated with a thermoplastic
material; and a thermoplastic
powder coating topcoat overlying at
least the basecoat. The basecoat is comprised
of between 10-90% of a petroleum
asphalt; between 10-90% of a
hydroxy-terminated homopolymer;
between 0.1-30% of an epoxy-functional
reactive diluent for reducing the viscosity
of the composition; up to five percent
of a surfactant for improving surface
imperfections; up to five percent of an
anti-oxidant; and up to 25% of a thickening
agent for improved thermal
resistance, resiliency, adhesion to the
substrate and topcoat and chemical
resistance.