Aqueous two-component binders and their use in coating and sealing compositions
AssigneeBayer Aktiengesellschaft
InventorsWieland Hovestadt, Lutz Schmalstieg, Christian Wamprecht, Karl-Ludwig Noble
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Abstract
The present invention relates to a binder composition containing a) 30 to 90 wt. % of an aqueous, hydroxy- and/or amino-functional resin dispersion and b) 10 to 70 wt. % of a curing agent containing alkoxysilyl groups and having a free isocyanate group content of 10 to 23 wt. % and a viscosity of 50 to 10000 mPa.multidot.s at 23.degree. C., wherein the molar ratio of the hydroxyl groups of component a) to the isocyanate groups of component b) is 0.5:1 to 2:1. The present invention also relates to the use of these binder compositions in coating and sealing compositions.
Claims17
A binder composition for aqueous, two-component polyurethane coating and sealing compositions which comprises
- a) 30 to 90 wt. % of an aqueous, hydroxy- and/or amino-functional resin dispersion and
- b) 10 to 70 wt. % of a curing agent component containing alkoxysilyl groups and having a free isocyanate group content of 10 to 23 wt. % and a viscosity of 50 to 10000 mPa.multidot.s at 23.degree. C.,
- wherein the molar ratio of the hydroxyl groups of component a) to the isocyanate groups of component b) is 0.5:1 to 2:1.
Dependencies are inferred from the claim text.