Laminated composites of polyurea-cellulose and methods for their

Details Laminated composites of polyurea-cellulose and methods for their Laminated composites of polyurea-cellulose and methods for their

1992-06-08

1994-01-18

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, B32B 2106, B32B 2114, B32B 2304

Patent

active

052800970

ABSTRACT:
A laminated product has an organic polymer layer on at least one surface of a substrate of cellulosic material impregnated with polyisocyanate. The substrate is preferably made from substantially delignified cellulosic material and an isocyanate resin. The isocyanate resin comprises a polyisocyanate, preferably PMDI, and may include a miscible organic solvent, preferably one such as propylene carbonate having a high boiling point and low flammability and toxicity. The substrate may be cured with an uncured overlay sheet positioned on the cured substrate and then cured to bond the substrate and overlay. Alternatively, a cured overlay may be adhesively or otherwise secured to a previously cured substrate. As yet another alternative, an uncured overlay sheet and uncured substrate may be placed in position and simultaneously cured. An overlay may be positioned on one or both major surfaces of a substrate sheet.

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patent: 5008359 (1991-04-01), Hunter
patent: 5140086 (1992-08-01), Hunter et al.
Gaul et al., "Novel Isocyanate Binder Systems for Composite Wood Panels," Proceedings of the S.P.I. International Technical/Marketing Conference, pp. 399-407 (1983).
Tsuzuki et al., "New Reactions of Organic Isocyanates. I. Reaction with Alkylene Carbonates," J. Org. Chem. 25:1009 (1960).

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