Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – From reactant having at least one -n=c=x group as well as...
Patent
1992-11-02
1993-10-19
Welsh, Maurice J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
From reactant having at least one -n=c=x group as well as...
528 70, 4273936, 4273855, 4283073, 568842, 568843, C08G 1832
Patent
active
052546608
ABSTRACT:
Solutions of a) a fluorine-containing polyisocyanate in b) an isocyanate-inert solvent are used to impart water, oil and dirt resistance to porous inorganic substrates impregnated therewith. The fluorine-containing polyisocyanate is preferably selected from fluorine-containing polyisocyanates having a fluorine content in the form of perfluorinated alkyl groups of from about 15 to about 60% by weight and an isocyanate content of from about 0.5 to about 15% by weight. These isocyanates are obtained by reaction of (cyclo)aliphatic isocyanates with fluorine-containing mono- and polyhydric alcohols, and selected fluorine-containing alcohols suitable for the production of these polyisocyanates.
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Bohm Stefan
Kirchmeyer Stephan
Kober Hermann
Muller Hanns-Peter
Pedain Josef
Bayer Aktiengesellschaft
Gil Joseph C.
Welsh Maurice J.
Whalen Lyndanne M.
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