CPC C09J 175/08 (2013.01) [C08G 18/12 (2013.01); C08G 18/3206 (2013.01); C08G 18/4816 (2013.01); C08G 18/4825 (2013.01); C08G 18/4829 (2013.01); C08G 18/4841 (2013.01); C08G 18/6674 (2013.01); C08G 18/724 (2013.01); C08G 18/73 (2013.01); C08G 18/7671 (2013.01); C08K 3/013 (2018.01); C08K 2003/2206 (2013.01)] | 15 Claims |
1. 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.
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