US 12,247,144 B2
Anhydrously curing polyisocyanate-based adhesives
Dirk Achten, Leverkusen (DE); Florian Golling, Düsseldorf (DE); Christoph Thiebes, Cologne (DE); Ute Nattke, Leverkusen (DE); and Piet Driest, Amersfoort (NL)
Assigned to Covestro Deutschland AG, Leverkusen (DE)
Appl. No. 17/284,813
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed Oct. 17, 2019, PCT No. PCT/EP2019/078234
§ 371(c)(1), (2) Date Apr. 13, 2021,
PCT Pub. No. WO2020/079160, PCT Pub. Date Apr. 23, 2020.
Claims priority of application No. 18201522 (EP), filed on Oct. 19, 2018.
Prior Publication US 2022/0145149 A1, May 12, 2022
Int. Cl. C09J 175/12 (2006.01); B32B 37/12 (2006.01); C08G 18/09 (2006.01); C08G 18/10 (2006.01); C08G 18/16 (2006.01); C08G 18/20 (2006.01); C08G 18/22 (2006.01); C08G 18/24 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/66 (2006.01); C08G 18/72 (2006.01); C08G 18/76 (2006.01); C08G 18/78 (2006.01); C09J 5/06 (2006.01)
CPC C09J 175/12 (2013.01) [B32B 37/1207 (2013.01); C08G 18/092 (2013.01); C08G 18/10 (2013.01); C08G 18/168 (2013.01); C08G 18/2018 (2013.01); C08G 18/225 (2013.01); C08G 18/242 (2013.01); C08G 18/3206 (2013.01); C08G 18/4845 (2013.01); C08G 18/6607 (2013.01); C08G 18/725 (2013.01); C08G 18/7607 (2013.01); C08G 18/7621 (2013.01); C08G 18/7671 (2013.01); C08G 18/7837 (2013.01); C09J 5/06 (2013.01); B32B 2311/24 (2013.01); B32B 2317/16 (2013.01); B32B 2323/10 (2013.01); B32B 2325/00 (2013.01); B32B 2327/06 (2013.01); C09J 2475/00 (2013.01)] 13 Claims
 
1. A process for producing an adhesive joint comprising:
a) applying a coating composition to a surface to form a coated surface, the coating composition comprising:
a polyisocyanate composition A having an average isocyanate functionality of at least 1.5, and
at least one catalyst B, which at 23° C. catalyzes a reaction of NCO groups to form isocyanurate groups and/or uretdione groups,
wherein an isocyanate content of the coating composition is 5% by weight to 60% by weight and a molar ratio of isocyanate groups to isocyanate-reactive groups optionally present in the coating composition is at least 5:1;
b) contacting the coated surface with a further surface; and
c) curing the coating composition at a temperature of at least 10° C. and at most 60° C.,
wherein in process step c) initially a temperature between 10° C. and 40° C. is maintained until the adhesive joint reaches a tensile shear strength according to DIN EN 1465 for adhesives of at least 0.5 N/mm2 and then a temperature of at least 50° C. is maintained until the adhesive joint reaches a strength of at least 2 N/mm2.