US 11,814,552 B2
Latent two-part polyurethane adhesives
Sergio Grunder, Freienbach (CH); Stefan Schmatloch, Freienbach (CH); and Joel Kunz, Horgen (CH)
Assigned to DDP SPECIALTY ELECTRONIC MATERIALS US, LLC, Wilmington, DE (US)
Appl. No. 16/975,562
Filed by DDP SPECIALTY ELECTRONIC MATERIALS US, LLC, Wilmington, DE (US)
PCT Filed Feb. 21, 2019, PCT No. PCT/US2019/018912
§ 371(c)(1), (2) Date Aug. 25, 2020,
PCT Pub. No. WO2019/182715, PCT Pub. Date Sep. 26, 2019.
Claims priority of provisional application 62/644,775, filed on Mar. 19, 2018.
Prior Publication US 2020/0399513 A1, Dec. 24, 2020
Int. Cl. C09J 175/08 (2006.01); C08G 18/12 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/66 (2006.01); C08G 18/72 (2006.01); C08G 18/73 (2006.01); C08G 18/76 (2006.01); C08K 3/013 (2018.01); C08K 3/22 (2006.01)
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.