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Method of applying a powder coating to a length of a lignocellulosic material

  • US 6,146,710 A
  • Filed: 11/30/1998
  • Issued: 11/14/2000
  • Est. Priority Date: 05/29/1996
  • Status: Expired due to Fees
First Claim
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1. A method of applying a powder coating to a length of a lignocellulosic material includes the steps of:

  • (a) impregnating the length of lignocellulosic material with an impregnating composition comprising either;

    (i) a dicarboxylic anhydride or a tricarboxylic anhydride dissolved in a suitable non-aqueous solvent;

    or(ii) an isocyanate thermosetting resin dissolved in a suitable non-aqueous solvent;

    or(iii) a combination of a dicarboxylic anhydride eor a tricarboxylic anhydride and an isocyanate thermo-setting resin dissolved in a suitable non-aqueous solvent;

    (b) if necessary removing from the impregnated length of lignocellullosic material any excess of the impregnating composition;

    (c) removing the non-aqueous solvent;

    (d) placing the impregnated length of lignocellulosic material in an electrostatic field or in a fluidized bed and applying a powder coating composition thereto so that the powder coating composition adheres thereto; and

    (e) then subjecting the length of impregnated and coated lignocellulosic material to elevated temperatures to polymerise and/or cross-link the resin of step (a) in the length of lignocellulosic material and to cure the powder coating composition to form a powder coating.

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