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AssigneeMethanol Chemie Nederland V.o.F.
InventorsArie Tinkelenberg, Henricus W. L. M. Vaessen, Kwai W. Suen, Anton J. Van Doorn
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Chipboard showing a strongly reduced formaldehyde-emission is prepared on the basis of cellulose-containing material with a urea-formaldehyde or urea-melamine-formaldehyde resin as a binder, wherein said binder contains 0.45 to 0.65 mole of formaldehyde per mole-equivalent of amino groups and to which between 2 and 20% by wt., relative to the resin, of a protein soluble or dispersible in the resin solution has been added. The resin preferably contains between 25 and 45% by wt. of melamine, relative to the combined amount of urea and melamine. The boards have good strength and weather resistance, and have a very low formaldehyde emission.
In the manufacture of chipboard material by hardening at elevated temperature and pressure of cellulose-containing material with an aminoplast resin on the basis of formaldehyde, urea and optionally melamine as bonding agent to form a sheet, the improvement of using in combination an aminoplast resin which contains 0.45 to 0.65 mole of formaldehyde per mole equivalent of amino groups and to which between 2 and 20% by wt., relative to the resin, of a protein, dissoluble or dispersible in the resin solution, has been added.
Dependencies are inferred from the claim text.