Isocyanate compositions and cellulose products impregnated...

Details Isocyanate compositions and cellulose products impregnated... Isocyanate compositions and cellulose products impregnated...

D - Textiles, Paper

21

H

D21H 17/08 (2006.01) B65D 65/42 (2006.01) C08G 18/16 (2006.01) C08G 18/30 (2006.01) C08G 18/64 (2006.01) C08K 5/10 (2006.01)

Patent

CA 2174585

The invention is directed to a composition of matter useful as a paper impregnant, to the method of its use, and to the products produced by the method. Poly (diphenylmethane diisocyanate) or PMDI has been used in the past as a paper impregnant with or without propylene carbonate as a diluent. These products have generally required pressing under high pressures and at elevated temperatures. It has now been found that triacetin and/or triethyl citrate in usages up to about 20% of PMDI give superior performance in impregnated products. The modified PMDI will cure at essentially ambient conditions in times as short as 1-2 days to insoluble polyureas with low residual amounts of isocyanates and reaction byproducts such as 4,4'- diaminodiphenylmethane. The treated papers can be used in applications of which skins for sandwich panels and high strength corrugated board would be exemplary.

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