US 12,486,350 B2
Two-component polyurethane composition with a high degree of hydrophobicity and adjustable pot life
Martin Demmig, Quickborn (DE); Steffen Kelch, Oberengstringen (CH); and Antonio Corsaro, Regensdorf (CH)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Appl. No. 17/792,458
Filed by SIKA TECHNOLOGY AG, Baar (CH)
PCT Filed Mar. 18, 2021, PCT No. PCT/EP2021/056953
§ 371(c)(1), (2) Date Jul. 13, 2022,
PCT Pub. No. WO2021/191045, PCT Pub. Date Sep. 30, 2021.
Claims priority of application No. 20165528 (EP), filed on Mar. 25, 2020.
Prior Publication US 2023/0047357 A1, Feb. 16, 2023
Int. Cl. C08G 18/12 (2006.01); C08G 18/22 (2006.01); C08G 18/32 (2006.01); C08G 18/38 (2006.01); C08G 18/48 (2006.01); C08G 18/69 (2006.01)
CPC C08G 18/12 (2013.01) [C08G 18/227 (2013.01); C08G 18/3206 (2013.01); C08G 18/3876 (2013.01); C08G 18/4841 (2013.01); C08G 18/4845 (2013.01); C08G 18/69 (2013.01); C08G 2170/00 (2013.01)] 13 Claims
 
1. A polyurethane composition comprising a first component A and a second component B, wherein
the first component A comprises
between 30% and 99% by weight based on component A of a polyol mixture P comprising
100 parts by weight of at least one hydrophobic polyol P1,
10 to 75 parts by weight of at least one hydrophilic polyol P2,
0 to 25 parts by weight of at least one diol P3 having two hydroxyl groups that are linked via a C2 to C9 carbon chain, and also
at least one compound T having at least one thiol group, wherein said compound T is selected from the group consisting of 3-mercaptopropane-1,2-diol, 2-mercapto-toluimidazole, 2-mercapto-benzothiazole, and polythiols having 2 to 6 thiol groups; and
the second component B comprises
at least one polyisocyanate I;
wherein one of component A and component B additionally comprises at least one metal catalyst K for the reaction of hydroxyl groups and isocyanate groups that is able to form thio complexes and
the molar ratio of all the thiol groups in the at least one compound T to all metal atoms in the at least one metal catalyst K is between 1:1 and 250:1.