Process for making a polyisocyanate-impregnated,paper-overlaid panel
Abstract
Abstract AN ORGANIC OLYISOCYANATE SERVES AS BOTH THE IMPREGNANT AND THE ADHESIVE FOR PAPER-OVERLAID PANELS. SUCH PANELS CAN BE USED FOR INDOOR AND OUTDOOR APPLICATIONS AND ESPECIALLY FOR MAKING CONCRETE FORMS. THE POLYISOCYANATES USED HAVE A LOW MOLECULAR WEIGHT AND CAN BY USED WITH OR WITHOUT CATALYSTS AND IN SOLUTION WITH AN INERT SOLVENT. THE PROPERTIES OF THE POLYISOCYANATES USED MAKE IT POSSIBLE TO COMBINE IMPREGNATION AND LAMINATION OF THE OVERLAY PAPER IN ONE STEP AS LONG AS SUBSTANTIALLY CLOSED CONDITIONS ARE USED. THE POLYISOCYANATE REACTING WITH WATER IN THE PAPER AND SUBSTRATE (ESPECIALLY WHEN WOOD) FORMS CARBON DIOXIDE, THE PRESSURE OF WHICH WHEN CONFINED BY THE PRESS WILL FORCE AND DISTRIBUTE THE POLYISOCYANATE INTO THE SUBSTRATE AND PAPER. WHERE THE SUBSTRATE TO BE OVERLAID IS PLYWOOD, THE SAME MAY BE FORMED AT THE SAME TIME AS THE OVERLAY IS PLACED. THE OVERLAY PAPER MAY BE KRAFTR PAPER OF ANY GRADE.
Inventors
- 👤 Hong Man Lee
Bibliographic Details
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