SUMMARY

Polymeric MDI is a versatile compound that has grown from the polyurethane industry, and has become an important wood binder in the forest products industry. As a wood binder, pMDI is highly effective and also quite unusual when compared to traditional thermosetting wood adhesives. The isocyanate functionality provides certain advantages which ensures its position in the forest products industry as a strong complement to urea/melamine-formaldehyde and phenol-formaldehyde systems. As wood composite technologies advance, we will certainly observe the growth of isocyanate binders and adhesives. The full potential of isocyanate chemistry has not been realized in the forest products industry, and so we should expect new and interesting technological advances.

ACKNOWLEDGMENTS

Special thanks are extended to Jim Yavorsky (Huntsman Polyurethanes), Ted Frick (Bayer Corporation), Brenda Colgrove (Dow Chemical Company), and Fred Kamke (Virginia Tech, Dept. of Wood Science & Forest Products) for assistance and advice in the preparation of this review.

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