US 11,999,881 B2
Two-component structural adhesives
Marco Holst, Greußenheim (DE); and Lutz Schmalstieg, Cologne (DE)
Assigned to GLUE TEC INDUSTRIEKLEBSTOFFE GMBH & CO. KG, Greußenheim (DE)
Appl. No. 15/733,487
Filed by GLUE TEC INDUSTRIEKLEBSTOFFE GMBH & CO. KG, Greußenheim (DE)
PCT Filed Nov. 21, 2018, PCT No. PCT/EP2018/082083
§ 371(c)(1), (2) Date Aug. 7, 2020,
PCT Pub. No. WO2019/154535, PCT Pub. Date Aug. 15, 2019.
Claims priority of application No. 10 2018 202 050.7 (DE), filed on Feb. 9, 2018.
Prior Publication US 2021/0102103 A1, Apr. 8, 2021
Int. Cl. C09J 175/12 (2006.01); C08G 18/32 (2006.01); C08G 18/79 (2006.01); C09J 175/02 (2006.01); C09J 175/04 (2006.01)
CPC C09J 175/12 (2013.01) [C08G 18/3234 (2013.01); C08G 18/3262 (2013.01); C08G 18/792 (2013.01); C09J 175/02 (2013.01); C09J 175/04 (2013.01)] 21 Claims
 
1. A two-component structural adhesive comprising at least the following components,
(i) at least one polyisocyanate having free isocyanate groups and having a content of aliphatically bound NCO groups of 16.0 to 24.0 wt. %, which is substantially free of ester and/or ether and/or carbonate groups,
(ii) at least one amino-functional polyaspartic acid ester of the general formula

OG Complex Work Unit Chemistry
in which n=2, and X represents a divalent organic residue obtained by removal of the amino groups from 1, 6-diaminohexane, from 2-methyl-1, 5-diaminopentane or from a linear or branched aliphatic diamine having up to 9 carbon atoms,
wherein R1 and R2 are a methyl or an ethyl group,
wherein the structural adhesive, in the cured state, has a tensile shear strength of at least 7 MPa, wherein the tensile shear strength is measured according to standard DIN/EN 1465 (2009-07) between two test bodies made of roughened V2A steel.