Crosslinkable polymeric compositions which have a long shelf life when in the form of an aqueous solution or dispersion, their preparation and their use
AssigneeBASF SE
InventorsRainer Blum, Rolf Osterloh, Gerhard Neubert, Gerhard Auchter
Life of this patent
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Abstract
Polymeric compositions which undergo crosslinking after drying at room temperature or elevated temperatures and are dissolved or dispersed in water are prepared by reacting polymeric organic compounds containing carbonyl and carboxyl groups with polyhydrazides in the presence of monoketones or monoaldehydes and are dissolved or dispersed in water by partially or completely neutralizing the carboxyl groups. They are useful as crosslinking agents and as binders for coatings on sheet-like substrates.
Claims5
A polymeric composition in the form of an aqueous solution or dispersion having a long shelf life which comprises:
- the reaction product of
- (A) a polymeric organic compounds containing carboxyl and carbonyl groups, and
- (B) a polyhydrazide, and as a stabilizing agent,
- (C) an alkyl, cycloalkyl, arylalkyl monofunctional monoketone, monoaldehyde or a mixture thereof, the reaction of (A) and (B) having been carried out in the presence of (C);
- the carboxyl groups of the reaction product being partially or completely neutralized.
Dependencies are inferred from the claim text.