Isocyanate modified cellulose products and method for their manu

Details Isocyanate modified cellulose products and method for their manu Isocyanate modified cellulose products and method for their manu

1990-11-27

1992-08-18

Nutter, Nathan M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From reactant which is a cellular material derived from...

527301, 428534, 428535, 428536, 4285371, C08H 504, C08G 1800, B32B 2106, B32B 2304

Patent

active

051400863

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

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Tsuzuki, R. et al., "New Reactions of Organic Isocyanates. I. Reaction with Alkylene Carbonates," J. Org. Chem. 25:1009 (1960).

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