A compound of formula (I) having advantageous properties when used as a latent curing agent for compositions containing isocyanate groups, and to compositions containing the compound of formula (I). The compound of formula (I) is odourless, is liquid and has comparatively low viscosity at room temperature and is stable in storage together with isocyanates. It makes possible odourless single-component polyurethane compositions which have good stability in storage, do not produce bubbles when cured in the presence of moisture, and cause no problematic odour emissions, giving a cured elastic material having good mechanical properties, good heat stability, a surprisingly non-adhesive surface and little tendency towards plasticizer migration.

A compound of formula (I) having advantageous properties when used as a latent curing agent for compositions containing isocyanate groups, and to compositions containing the compound of formula (I). The compound of formula (I) is odourless, is liquid and has comparatively low viscosity at room temperature and is stable in storage together with isocyanates. It makes possible odourless single-component polyurethane compositions which have good stability in storage, do not produce bubbles when cured in the presence of moisture, and cause no problematic odour emissions, giving a cured elastic material having good mechanical properties, good heat stability, a surprisingly non-adhesive surface and little tendency towards plasticizer migration.

Hydroxyaldimines of formula (I), their reaction products, in particular products of their reaction with polyisocyanates, and compositions including isocyanate groups and containing such reaction products. The hydroxyaldimine permits compositions which have good storage stability, a long open time, low odour, rapid, bubble-free curing and good mechanical properties, and which are not susceptible to plasticizer migration and have a particularly low content of monomeric diisocyanates. In particular, it permits reactive hot-melt adhesives with a particularly good workability.

Hydroxyaldimines of formula (I), their reaction products, in particular products of their reaction with polyisocyanates, and compositions including isocyanate groups and containing such reaction products. The hydroxyaldimine permits compositions which have good storage stability, a long open time, low odour, rapid, bubble-free curing and good mechanical properties, and which are not susceptible to plasticizer migration and have a particularly low content of monomeric diisocyanates. In particular, it permits reactive hot-melt adhesives with a particularly good workability.

A basecoat coating composition includes an aromatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than 97 g/L. A topcoat coating composition includes an aliphatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than or equal to 95 g/L. The total composition formulations of the basecoat and/or topcoat may have a VOC content of less than 50 g/L. A membrane system may include an optional primer coating, and the above described basecoat and topcoat coating compositions.

A basecoat coating composition includes an aromatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than 97 g/L. A topcoat coating composition includes an aliphatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than or equal to 95 g/L. The total composition formulations of the basecoat and/or topcoat may have a VOC content of less than 50 g/L. A membrane system may include an optional primer coating, and the above described basecoat and topcoat coating compositions.

A basecoat coating composition includes an aromatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than 97 g/L. A topcoat coating composition includes an aliphatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than or equal to 95 g/L. The total composition formulations of the basecoat and/or topcoat may have a VOC content of less than 50 g/L. A membrane system may include an optional primer coating, and the above described basecoat and topcoat coating compositions.

A basecoat coating composition includes an aromatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than 97 g/L. A topcoat coating composition includes an aliphatic polyurethane pre-polymer having isocyanate terminal end groups, a first solvent and optionally a second VOC-exempt solvent, in which the total composition formulation has a VOC content of less than or equal to 95 g/L. The total composition formulations of the basecoat and/or topcoat may have a VOC content of less than 50 g/L. A membrane system may include an optional primer coating, and the above described basecoat and topcoat coating compositions.

The invention relates to a method for reducing water content of an epoxy or/and polyurethane paint dispersion to be prepared in a sealed and pressurized aerosol can which paint dispersion comprises, —free water of an amount W1, —organic solvent(s) of an amount W2,5-epoxy or/and polyurethane resin of an amount W3, —liquefied propellant of an amount W5, —ketone of an amount W6, —blocked hardener (hardener precursor) of the epoxy or/and polyurethane resin of an amount W4, wherein said blocked hardener compounds of said epoxy or/and 10 polyurethane resin is selected from the group comprising of an aldimine, an enamine, an imine, a Mannich base, a Schiff's base, an oxazolidine or a bisoxazol-idine, and mixtures thereof, —adjuvants, —water scavenger(s), —catalytic amount of a weak acid to shift equilibrium of reversible reaction (I) between the free water present in said dispersion and blocked hardener compounds of the epoxy or/and polyurethane resin back to formation of said initial epoxy or polyure-thane blocked hardener compounds and to prevent formation of the epoxy or/and polyurethane hardener amines: expoxy and/or polyurethane hardener+ketones catalyst expoxy and/or polyurethane+free water (amine) hardener precursor (1). The method comprises a step in which before providing organic solvent into the aerosol can its water content is reduced by admixing reactant with sulfonyl isocya-nate functionality as a water scavenger into said organic solvent.

The invention relates to a method for reducing water content of an epoxy or/and polyurethane paint dispersion to be prepared in a sealed and pressurized aerosol can which paint dispersion comprises, —free water of an amount W1, —organic solvent(s) of an amount W2,5-epoxy or/and polyurethane resin of an amount W3, —liquefied propellant of an amount W5, —ketone of an amount W6, —blocked hardener (hardener precursor) of the epoxy or/and polyurethane resin of an amount W4, wherein said blocked hardener compounds of said epoxy or/and 10 polyurethane resin is selected from the group comprising of an aldimine, an enamine, an imine, a Mannich base, a Schiff's base, an oxazolidine or a bisoxazol-idine, and mixtures thereof, —adjuvants, —water scavenger(s), —catalytic amount of a weak acid to shift equilibrium of reversible reaction (I) between the free water present in said dispersion and blocked hardener compounds of the epoxy or/and polyurethane resin back to formation of said initial epoxy or polyure-thane blocked hardener compounds and to prevent formation of the epoxy or/and polyurethane hardener amines: expoxy and/or polyurethane hardener+ketones catalyst expoxy and/or polyurethane+free water (amine) hardener precursor (1). The method comprises a step in which before providing organic solvent into the aerosol can its water content is reduced by admixing reactant with sulfonyl isocya-nate functionality as a water scavenger into said organic solvent.