Polyisocyanate particle board binders

Details Polyisocyanate particle board binders Polyisocyanate particle board binders

C - Chemistry, Metallurgy

08

G

18/1010, 400/111

C08G 18/00 (2006.01) C08L 97/02 (2006.01) C08L 75/04 (2006.01)

Patent

CA 1166382

ABSTRACT OF THE DISCLOSURE The use of polyisocyanates as binders in the pre- paration of particle boards is subject to the drawhack 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: Image where R = alkyl (C3 and higher), alkenyl (C3 and higher), aryl, alkyl-substituted aryl, Image where R2 is alkyl, aryl, or alkyl-substituted aryl, A and B are H, methyl, chloromethyl, 2,2,2-trichloromethy1, 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; R1 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=0 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, they can each be applied either neat or in the form of an emulsion or emulsions.

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