Process for preparing particle board and polyisocyanate-phosphorus compound release agent composition therefor

US4257996A · kind A · utility

Assignee

• The Upjohn Co. · US

Inventors

• William J. Farrissey, Jr. · Northford, US
• Alexander McLaughlin · Meriden, US
• Reinhard H. Richter · North Haven, US
• Curtis P. Smith · Cheshire, US
• Benjamin W. Tucker · Bethany, US

Key dates

• Filing date: Apr 14, 1980
• Grant date: Mar 24, 1981
• Expiry date: Apr 14, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08L2205/06
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The use of polyisocyanates as binders in the preparation of particle boards is subject to the drawback that the boards exhibit a tendency to adhere to the face of the platens used in their formation. This problem is minimized by utilizing, in association with the polyisocyanate to be used as binder, minor amounts of one or more phosphates or thiophosphates of the formula: ##STR1## where R=alkyl (C.sub.3 and higher), alkenyl (C.sub.3 and higher), aryl, alkyl-substituted aryl, ##STR2## (where R.sub.2 is alkyl, aryl, or alkyl-substituted aryl, A and B are H, methyl, chloromethyl, 2,2,2-trichloromethyl, m=1-25) and lower-alkyl substituted by from 1 to 2 acyloxy groups where acyl is the residue of an aliphatic carboxylic acid having at least 2 carbon atoms; R.sub.1 is Cl, Br, lower-alkoxy, lower-alkylmercapto, arylamino, mono(lower-alkyl)amino, di(lower-alkyl)amino, hydroxy(lower-alkylene)oxy, aryloxy, hydrocarbylureido, and an enol residue; X=O or S and n=1 or 2. The polyisocyanates and the phosphates or thiophosphates are applied to the particles separately, or after preblending one with the other. Whether the components are applied separately or in combination one with the other, the…