Hybrid topcoats
AssigneeBayer MaterialScience AG
InventorsSteffen Hofacker, Markus Mechtel, Thomas Klimmasch
Life of this patent
Estimating the term…
Abstract
The present invention relates to weathering-stable mixtures for preparing organic-inorganic (hybrid) transparent topcoat materials. The hybrid composition comprises an inorganic binder based on polyfunctional organosilanes which contain at least 2 silicon atoms having in each case 1 to 3 alkoxy or hydroxyl groups, the silicon atoms being attached by in each case at least one Si—C bond to a structural unit that links the silicon unit; (semi)metal alkoxides and/or hydrolysis and concentration products of these; inorganic UV absorbers selected from the group consisting of ZnO and CeO2; an organic polyol; and one or more solvents.
Claims8
Hybrid compositions comprising
- A) one or more inorganic binders based on polyfunctional organosilanes which contain at least 2 silicon atoms having in each case 1 to 3 alkoxy or hydroxyl groups, the silicon atoms being attached by in each case at least one Si—C bond to a structural unit that links the silicon unit,
- B) (semi)metal alkoxides, hydrolysis products of (semi)metal alkoxides, condensation products of (semi)metal alkoxides, and combinations of these,
- C) inorganic UV absorbers selected from the group consisting of ZnO, CeO2 and combinations of ZnO and CeO2 in the form of particles at least 90% of which have an average particle diameter as measured by ultracentrifuge of ≦50 nm,
- D) one or more organic polyols having a hydroxyl functionality ≧2 and a number-average molecular weight of 250 g/mol to 10 000 g/mol, and
- E) one or more solvents.
Dependencies are inferred from the claim text.