Treatment of cellulose

Details Treatment of cellulose Treatment of cellulose

1974-12-20

1982-07-13

Morgenstern, Norman

Coating processes

Coating by vapor, gas, or smoke

Base includes an inorganic compound containing silicon or...

4272556, 427296, 427316, 427324, 427326, 427391, 427392, C23C 1100

Patent

active

043394795

ABSTRACT:
A process for rendering cellulosic material water repellent that requires no subsequent neutralization step while retaining the desired water repellent and strength characteristics thus provided by selecting a cellulosic material having a water content of up to about 10%, preferably below about 2% and contacting the material with vapors of a lower alkyl silicon halide during which contacting the concentration and temperature of the halide vapor, the pressure within the treating chamber and the contact time are all maintained so as to provide a water repellent cellulosic material having a pH greater than 2.5. In one aspect of the invention, the cellulosic material subjecting to contacting is substantially frozen and in another aspect contacting is conducted under vacuum.

REFERENCES:
patent: 2306222 (1942-12-01), Patnode
patent: 2386259 (1945-10-01), Norton
patent: 2412470 (1946-12-01), Norton
patent: 2782090 (1957-02-01), Robbart
patent: 2961338 (1960-11-01), Robbart
patent: 2995470 (1961-08-01), Robbart
patent: 3676182 (1972-07-01), Smith
patent: 3837804 (1974-09-01), Walker et al.
patent: 3856558 (1974-12-01), Robbart

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