Treatment of materials with silicon halides

Details Treatment of materials with silicon halides Treatment of materials with silicon halides

D - Textiles, Paper

01

F

8/93.21

D01F 11/02 (2006.01) B01D 5/00 (2006.01) D21H 17/59 (2006.01)

Patent

CA 1106110

ABSTRACT Materials such as cellulose are rendered water repellent without objectionable degradation by contacting them with a non-laminar silicon halide vapor stream which reacts with hydroxyl groups to form a siloxane. The non-laminar flow of the halide vapor is maintained over the reaction interval of the surface being treated and is exhausted at a position where further exposure of the material to the treating vapor provides a negligible improvement in water repellency. This provides a suitable build-up of siloxane to achieve water repellency, and simultaneously prevents a cumulative hydrogen halide reac- tion which would otherwise have an unacceptably adverse effect on the long term strength of the treated materials.

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