Liquid-applied waterproofing membrane comprising oxazolidine and aldimine

A one-part moisture-curing liquid-applied waterproofing membrane comprising:

• at least one isocyanate-functional polyurethane polymer based on an aliphatic polyisocyanate;
• at least one aldimine of the formula (I),
• wherein
• A is an n-valent hydrocarbyl moiety of molecular weight in the range of 28 to 5000 g/mol optionally containing ether or urethane groups,
• R1 and R2 are the same or different C1 to C12 linear or branched alkyls, or are joined together to form a divalent linear or branched C4 to C12 hydrocarbyl moiety which is part of a 5- to 8-membered carbocyclic ring,
• R3 is hydrogen or a linear or branched C1 to C12 alkyl or arylalkyl or alkoxycarbonyl,
• R4 is a monovalent C6 to C20 hydrocarbyl moiety optionally containing ether, carbonyl or ester groups, and n is from 2 to 6;
• and
• at least one oxazolidine of the formula (II),
• wherein
• B is a m-valent hydrocarbyl moiety of molecular weight in the range of 28 to 2000 g/mol optionally containing ether, ester, amide, carbonate, urethane, or urea groups,
• R5 is selected from hydrogen or C1 to C12 linear or branched alkyl,
• R6 is a C3 branched alkyl, and
• m is 2 or 3;
• wherein the ratio between the number of aldimino groups and the number of oxazolidino groups is in the range of 80/20 to 20/80.