Surface coatings and a process for their production
AssigneeBayer Aktiengesellschaft
InventorsChristian Zwiener, Michael Sonntag, Dieter Margotte, Pedain, Harald Blum, Volker Schneider
Life of this patent
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Abstract
A coating composition in which the binding agent is a two-component system containing a) a polyisocyanate component and b) an isocyanate-reactive component and contains b1) specific ester group-containing secondary polyamines, b2) specific moisture-activatable blocked polyamines and b3) optionally other known compounds containing isocyanate-reactive groups, and a process for preparing coated substrates from this coating composition.
Claims21
A coating composition in which the binder is a two-component system comprising
- a) a polyisocyanate component and
- b) an isocyanate-reactive component containing a mixture of
- b1) a compound corresponding to formula I ##STR9## b2) a compound having a number average molecular weight of 73 to 10,000 and containing at least one structural unit per molecule corresponding to formula II ##STR10## and b3) optionally other compounds containing isocyanate-reactive groups,
- wherein
- X represents an n-valent radical which is inert towards isocyanate groups and is obtained by removing the primary amino groups from a polyamine having (cyclo)aliphatically bound amino groups and a molecular weight of 60 to 6,000,
- R.sup.1 and R.sup.2 may be the same or different and represent alkyl radicals having 1 to 18 carbon atoms,
- n is an integer of at least 2, and
- m is 0 or 1.
A process for the production of a surface coating which comprises coating a substrate with a coating composition in which the binder is a two-component system comprising
- a) a polyisocyanate component and
- b) an isocyanate-reactive component containing a mixture of
- b1) a compound corresponding to formula I ##STR13## b2) a compound having a number average molecular weight of 73 to 10,000 and containing at least one structural unit per molecule corresponding to formula II ##STR14## and b3) optionally other compounds containing isocyanate-reactive groups,
- wherein
- X represents an n-valent radical which is inert towards isocyanate groups and is obtained by removing the primary amino groups from a polyamine having (cyclo)aliphatically bound amino groups and a molecular weight of 60 to 6,000,
- R.sup.1 and R.sup.2 may be the same or different and represent alkyl radicals having 1 to 18 carbon atoms,
- n is an integer of at least 2, and
- m is 0 or 1.
Dependencies are inferred from the claim text.