ISOCYANATE MODIFIED CELLULOSE PRODUCTS AND METHOD FOR THEIR MANUFACTURE

摘要

A method is disclosed for producing a polyurea-cellulose composite material from substantially delignified cellulosic material and an isocyanate resin. The isocyanate resin comprises a polyisocyanat e, preferably PMDI, and a miscible organic solvent, preferably one such as propylene carbonate having a high boiling point and low f lammability and toxicity. The composite surprisingly exhibits values of physical parameters that are at least as good as, and sometim es far superior to, corresponding parameters of similar composites made using neat (undiluted) polyisocyanate. Single- and mu ltiple-ply composites can be made, employing only a single curing step.