Latent two-part polyurethane adhesives

A two-component polyurethane adhesive composition having a polyol component and an isocyanate component, wherein:

• the polyol component comprises:
• a) at least 35 weight percent, based on the weight of the polyol component, of a mixture of polyether polyols, the mixture of polyether polyols comprising
• a-1) one or more polyether polyols each having a hydroxyl equivalent weight of 400 to 2000 and each being selected from homopolymers of propylene oxide and copolymers of 70 to 99% by weight propylene oxide and 1 to 30% by weight ethylene oxide, the one or more polyether polyols a-1) having an average nominal hydroxyl functionality of 2 to 4;
• and
• a-2) one or more polyether polyols each having a hydroxyl equivalent weight of 100 to 399, the one or more polyether polyols a-2) having an average nominal functionality of at least 4, wherein the one or more polyether polyols a-2) are present in an amount of at least 2 weight percent, based on the weight of the polyol component;
• b) one or more aliphatic diol chain extenders having a hydroxyl equivalent weight of up to 99;
• c) 0 to 3 parts by weight per 100 parts by weight of a) of at least one compound having at least two primary and/or secondary aliphatic amine groups;
• d) a catalytically effective amount of at least one urethane catalyst;
• e) 5 to 60 weight percent, based on the weight of the polyol component, of at least one particulate filler, wherein the particulate filler includes precipitated calcium carbonate filler particles having a particle size of up to 200 nm;
• and the polyisocyanate component comprises at least one organic polyisocyanate and 0 to 50% by weight, based on the total weight of the polyisocyanate component, of at least one particulate filler.