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 incorporating minor amounts of a mixture of certain organic sulfonic acids , hydrogen sulfates , salts and derivatives thereof , into the polyisocyanate to be used as binder . the polyisocyanates and the sulfonic acids , hydrogen sulfates , salts and derivatives 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 of in the form of an emulsion or emulsions .