Process for preparing particle board and polyisocyanate-phosphor

Details Process for preparing particle board and polyisocyanate-phosphor Process for preparing particle board and polyisocyanate-phosphor

1980-04-14

1981-03-24

Woodberry, Edward M.

Plastic and nonmetallic article shaping or treating: processes

Forming articles by uniting randomly associated particles

Utilizing diverse solid particles

252182, 260 9, 264109, 528 51, 528 72, 528 75, B29J 502, C08G 1828, C08L 102

Patent

active

042579961

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, they can each be applied either neat or in the form of an emulsion or emulsions.

REFERENCES:
patent: 3870665 (1975-03-01), Diehr et al.
patent: 3919017 (1975-11-01), Shoemaker et al.
patent: 3943075 (1976-03-01), Fishbein et al.
patent: 4005034 (1977-01-01), Weil
patent: 4024088 (1977-05-01), Godlewski
patent: 4100328 (1978-07-01), Gallagher

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