US 9,809,732 B2
Two-component polyurethane compositions, in particular suitable for use as viscoplastic structural adhesives
Steffen Kelch, Oberengstringen (CH)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Appl. No. 14/428,190
Filed by SIKA TECHNOLOGY AG, Baar (CH)
PCT Filed Sep. 6, 2013, PCT No. PCT/EP2013/068433
§ 371(c)(1), (2) Date Mar. 13, 2015,
PCT Pub. No. WO2014/040916, PCT Pub. Date Mar. 20, 2014.
Claims priority of application No. 12184554 (EP), filed on Sep. 14, 2012.
Prior Publication US 2015/0247073 A1, Sep. 3, 2015
This patent is subject to a terminal disclaimer.
Int. Cl. C09J 175/06 (2006.01); B32B 7/12 (2006.01); B32B 37/12 (2006.01); C08G 18/76 (2006.01); C08G 18/32 (2006.01); C08G 18/36 (2006.01)
CPC C09J 175/06 (2013.01) [B32B 7/12 (2013.01); B32B 37/12 (2013.01); C08G 18/3206 (2013.01); C08G 18/36 (2013.01); C08G 18/7621 (2013.01); C08G 18/7671 (2013.01); B32B 2037/1253 (2013.01); B32B 2375/00 (2013.01); Y10T 428/31551 (2015.04)] 10 Claims
OG exemplary drawing
 
1. A two-component polyurethane adhesive composition consisting of a polyol component K1 and a polyisocyanate component K2;
wherein:
the polyol component K1 comprises castor oil A1 and 1,2,3-propanetriol A2,
the polyisocyanate component K2 comprises at least one aromatic polyisocyanate B1,
a ratio of the wt % of the castor oil A1 to the 1,2,3-propanetriol is 8-30,
a ratio of a sum of all NCO groups of the aromatic polyisocyanate B1:a sum of all OH groups of the castor oil A1 and the 1,2,3-propanetriol A2=1.15:1-0.85:1,
a sum of all OH groups of the castor oil A1 and the 1,2,3-propanetriol A2 is ≧99.5% of a sum of all OH groups of the two-component polyurethane adhesive composition, and
wherein the two-component polyurethane adhesive composition is a hydrolytically degradable adhesive.