A compatibilized polyolefin/polyolefin composite material includes a
polyolefin/polyolefin composite substrate and a reinforcing mat formed
from reinforcing fibers and a thermoplastic polymer powder. The mat may
also incorporate an optional emulsion polymer binder. In addition the
compatibilized polyolefin/polyolefin composite material may incorporate an
additional film layer so that the mat is sandwiched between the substrate
and the film layer. A method of producing such materials from a
polyolefin/polyolefin composite substrate that is
topologically/mechanically bonded to a reinforcing mat formed from
reinforcing fibers and thermoplastic polymer powder is also described.