US 12,104,005 B2
Isocyanate-group-containing polymer having a low content of monomeric diisocyanates
Michael Schlumpf, Stallikon (CH); Sven Reimann, Zürich (CH); and Berzad Durmic, Zufikon (CH)
Assigned to SIKA TECHNOLOGY AG, Baar (CH)
Appl. No. 17/264,184
Filed by SIKA TECHNOLOGY AG, Baar (CH)
PCT Filed Aug. 5, 2019, PCT No. PCT/EP2019/071051
§ 371(c)(1), (2) Date Jan. 28, 2021,
PCT Pub. No. WO2020/030608, PCT Pub. Date Feb. 13, 2020.
Claims priority of application No. 18187905 (EP), filed on Aug. 8, 2018.
Prior Publication US 2021/0309786 A1, Oct. 7, 2021
Int. Cl. C08G 18/10 (2006.01); C08G 18/24 (2006.01); C08G 18/30 (2006.01); C08G 18/32 (2006.01); C08G 18/48 (2006.01); C08G 18/76 (2006.01); C09D 175/08 (2006.01); C09D 175/12 (2006.01); C09J 5/00 (2006.01); C09J 175/08 (2006.01); C09J 175/12 (2006.01); C08K 3/26 (2006.01)
CPC C08G 18/10 (2013.01) [C08G 18/246 (2013.01); C08G 18/307 (2013.01); C08G 18/325 (2013.01); C08G 18/4829 (2013.01); C08G 18/4841 (2013.01); C08G 18/7671 (2013.01); C09D 175/08 (2013.01); C09D 175/12 (2013.01); C09J 5/00 (2013.01); C09J 175/08 (2013.01); C09J 175/12 (2013.01); C08K 2003/265 (2013.01); C09J 2475/00 (2013.01)] 11 Claims
 
1. A polyetherurethane polymer containing isocyanate groups, wherein
the polyetherurethane polymer has an NCO content in the range from 1.3% to 1.9% by weight, and a monomeric diisocyanate content of not more than 0.5% by weight, and
wherein the polyetherurethane polymer is obtained from a reaction of at least one monomeric aromatic diisocyanate and a polyether triol in an NCO/OH ratio of at least 3/1 and subsequent removal of a majority of the monomeric aromatic diisocyanate by means of a suitable separation method,
wherein the monomeric aromatic diisocyanate is diphenylmethane 4,4′-diisocyanate,
wherein the polyether triol (i) has an OH number in the range from 25 to 32 mg KOH/g, (ii) contains an amount of monools such that the polyether triol has an average OH functionality in the range from 2.2 to 2.6 and (iii) based on all repeat units, has 80% to 90% by weight of 1,2-propyleneoxy groups and 10% to 20% by weight of 1,2-ethyleneoxy groups.