Method of impregnating
First Claim
1. A method of impregnating a mineral substrate comprising spraying, rolling, immersing or painting the substrate with an impregnating agent, in which the impregnating agent comprises(a) an NCO-prepolymer or NCO-semi-prepolymer which is curable by atmospheric moisture, with an NCO content of 2 to 25% by weight, based on(a1) an organic polyisocynate and(a2) a polyhydroxyl compound with at least 2 alcohol hydroxyl groups, and(b) a solvent which is inert with respect to isocynate groups, whereby the organic polyisocyanate (a1) is an organic polyisocyanate with exclusively aliphatically or cycloaliphatically bound isocyanate groups and the (a2) polyhydroxyl compound is a polysiloxane of the molecular weight range of 300 to 5000, which has at least 2 alcoholically bound hydroxyl groups.
1 Assignment
0 Petitions
Accused Products
Abstract
Impregnating agents are provided consisting essentially of
(a) an NCO-prepolymer or NCO-semi-prepolymer which is curable by atmospheric moisture, with an NCO content of 2 to 25% by weight, based on
(a1) an organic polyisocyanate and
(a2) a compound with at least 2 alcohol hydroxyl groups,
(b) a solvent which is inert with respect to isocyanate groups in which the (a1) organic polyisocyanate is a polyisocyanate with exclusively aliphatically or cycloaliphatically bound isocyanate groups and the (a2) polyhydroxyl compound is a polysiloxane of the molecular weight range of 300 to 5000 which has at least 2 alcoholically bound hydroxyl groups.
A method of impregnating mineral substrates with such impregnating agents is also provided.
7 Citations
14 Claims
-
1. A method of impregnating a mineral substrate comprising spraying, rolling, immersing or painting the substrate with an impregnating agent, in which the impregnating agent comprises
(a) an NCO-prepolymer or NCO-semi-prepolymer which is curable by atmospheric moisture, with an NCO content of 2 to 25% by weight, based on (a1) an organic polyisocynate and (a2) a polyhydroxyl compound with at least 2 alcohol hydroxyl groups, and (b) a solvent which is inert with respect to isocynate groups, whereby the organic polyisocyanate (a1) is an organic polyisocyanate with exclusively aliphatically or cycloaliphatically bound isocyanate groups and the (a2) polyhydroxyl compound is a polysiloxane of the molecular weight range of 300 to 5000, which has at least 2 alcoholically bound hydroxyl groups.
Specification