US Patent 10967608 Composite boards and panels

A building panel (1) including a water resistant core (5) including thermoplastic material 21 and a surface layer (4) including thermosetting resins. Also, production methods to form a board material (1′) with a dry blend of thermoplastic particles 21a in powder form and fillers in powder form and to apply a surface layer (4) with a hot-hot lamination process to a core (5) including such board material.