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

1988-11-25

1991-04-16

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

050083597

ABSTRACT:
The invention is a method of making a cellulose based polymeric material and the products of the invention. A cellulosic substrate is impregnated with an essentially uncatalyzed polyfunctinal isocyanate and pressed at elevated temperature and pressure. The substrate may be a chemical or thermomechanical pulp or paper while the isocyanate is preferably diphenylmethane diisocyanate or its oligomers. Pressing conditions are preferably in the range of about 150.degree.-245.degree. C. at pressures in the range of about 2700-8300 kPa for times less than 2 minutes. Moisture content of the cellulosic substrate is not highly critical and may be as high as 7% without adverse effects. The product is especially useful as overlays and for forming strong, water resistant laminates which can be molded in either flat or three dimensional forms.

REFERENCES:
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patent: 4525321 (1985-06-01), Tonniges
patent: 4609513 (1986-09-01), Israel
Hajime Yamashina, Fumito Nakamura, Kazuo Sakai, Yutaka Satoh, Kazuhide Minato: "Strengthening Paper Pipes With Aromatic Isocyanate Compounds", J. Hokkaido For. Prod. Res. Inst., vol. 2, No. 3, pp. 28-32 (1988).

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