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US 5,859,118 AGranted
Aqueous dispersions of polyurethane/ureas containing alkoxysilane groups and colloidal silicas
AssigneeBayer Aktiengesellschaft
InventorsRichard R. Roesler, Lutz Schmalstieg, Lyuba K. Gindin
Life of this patent
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Abstract
The present invention relates to aqueous dispersions which contain A) 30 to 90% by weight, based on the solids content of A) and B), of polyurethane/ureas containing 0.5 to 6% by weight, based on the weight of the polyurethane/ureas, of alkoxysilane groups (calculated as Si, MW 28) and B) 10 to 70% by weight, based on the solids content of A) and B), of colloidal silica. The present invention relates to coatings prepared from these aqueous dispersions.
Claims17
An aqueous dispersion which contains
- A) 30 to 90% by weight, based on the solids content of A) and B), of polyurethane/ureas containing 0.5 to 6% by weight, based on the weight of the polyurethane/ureas, of alkoxysilane groups (calculated as Si, MW 28) and
- B) 10 to 70% by weight, based on the solids content of A) and B), of colloidal silica.
An aqueous dispersion which contains
- A) 30 to 90% by weight, based on the solids content of A) and B), of polyurethane/ureas containing 0.5 to 6% by weight, based on the weight of the polyurethane/ureas, of alkoxysilane groups (calculated as Si, MW 28), which have been incorporated by the reaction of isocyanate groups with a compound containing at least one alkoxysilane groups and at least one aspartate group, and
- B) 10 to 70% by weight, based on the solids content of A) and B), of colloidal silica.
Dependencies are inferred from the claim text.