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Method of modifying cellulose with formaldehyde using lewis acid catalysts, solutions for use in such method, and products thereof

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1. A METHOD FOR CROSS LINKING CELLULOSE WHICH COMPRISES IMPREGNATING THE CELLULOSE WITH FORMALDEHYDE AND WITH A CURING AGENT, IN THE PRESENCE OF WATER, AT A PH OF BETWEEN ABOUT 5 AND ABOUT 10, THE CURING AGENT BEING A METALLIC SALT WHICH IS A LEWIS ACID IN THE SOLID STATE AND WHICH IS WATER SOLUBLE TO THE EXTENT OF AT LEAST 0.03 G-MOL/LITER AT 20*C. AT PH 5; THE PICK-UP OF CURING AGENT BEING BETWEEN AND SUBSEQUENTLY CURING THE IMPREGNATED CELLULOSE TO CHEMICALLY BIND BETWEEN ABOUT 0.1 AND ABOUT 7% FORMALDEHYDE, BY WEIGHT OF THE CELLULOSE, TO THE CELLULOSE.
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