Organic polyisocyanate-alkylene oxide adhesive composition for preparing lignocellulosic composite products
AssigneeAtlantic Richfield Company
InventorsJames M. Gaul, Tinh Nguyen
Life of this patent
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Abstract
An improved adhesive binder composition is provided for the preparation of lignocellulosic composite molded articles, especially flake or particleboard, made from moldable compositions which comprises an organic polyisocyanate-alkylene oxide or halogenated alkylene oxide and optionally lignin, for application to the lignocellulosic material prior to the molding process to form the composite product.
Claims26
An adhesive binder composition for the preparation of compression moldable lignocellulosic articles which comprises an organic di- or polyisocyanate, an alkylene oxide or halogenated alkylene oxide having from 3 to 12 carbon atoms and from 20 to 35 weight percent lignin added as diluent.
A compression moldable lignocellulosic composition comprising lignocellulosic particles and from about 1.5 to 12 percent by weight based on oven dried particles of an adhesive binder composition which comprises from about 20 to 95 weight percent organic di- or polyisocyanate and from about 5 to 80 weight percent alkylene oxide or halogenated alkylene oxide having from 3 to 12 carbon atoms.
A composition board product comprising a compression molded lignocellulosic composition comprising lignocellulosic particles and from about 1.5 to 12 weight percent based on oven dried lignocellulosic particles employed of an adhesive binder composition, said binder composition being a mixture of from about 20 to 95 weight percent organic di- or polyisocyanate and from 5 to 80 weight percent alkylene or halogenated alkylene oxide having from 3 to 12 carbon atoms.
A method for the preparation of lignocellulosic composite articles comprising the steps of
- (a) mixing together lignocellulosic particles and from about 1.5 to 12 weight percent based on oven dried lignocellulosic particles of an adhesive binder composition comprising from 20 to 95 weight percent organic di- and polyisocyanate and from about 5 to 80 weight percent alkylene or halogenated alkylene oxide having from 3 to 12 carbon atoms to form a moldable composition;
- (b) introducing said moldable composition onto a metal mold, caul plate or platen which has been sprayed or coated with a release agent;
- (c) compression shaping said composition at temperatures of between about 140.degree. C. to 220.degree. C. at pressures of from about 100 to 600 psi for a period of from about 1 to 10 minutes to form a composite article of desired shape and/or thickness;
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- (d) thereafter releasing said lignocellulosic composite article from said metal mold, caul plate or platen.
Dependencies are inferred from the claim text.