US 11,795,266 B2
Method for preparing a mixed silane-terminated polymer
Florian Stempfle, Cologne (DE); Hans-Josef Laas, Odenthal (DE); and Christoph Thiebes, Cologne (DE)
Assigned to Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
Appl. No. 17/611,931
Filed by Covestro Intellectual Property GmbH & Co. KG, Leverkusen (DE)
PCT Filed May 25, 2020, PCT No. PCT/EP2020/064380
§ 371(c)(1), (2) Date Nov. 17, 2021,
PCT Pub. No. WO2020/239663, PCT Pub. Date Dec. 3, 2020.
Claims priority of application No. 19176824 (EP), filed on May 27, 2019.
Prior Publication US 2022/0204683 A1, Jun. 30, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. C08G 18/12 (2006.01); C08G 18/71 (2006.01); C08G 18/22 (2006.01); C08G 18/28 (2006.01); C08G 18/48 (2006.01); C08G 18/75 (2006.01)
CPC C08G 18/718 (2013.01) [C08G 18/12 (2013.01); C08G 18/222 (2013.01); C08G 18/289 (2013.01); C08G 18/4845 (2013.01); C08G 18/755 (2013.01)] 13 Claims
 
1. A process for preparing a mixed silane-terminated polymer by reacting a polyol component A) with a diisocyanate component B) comprising isophorone diisocyanate, with at least one isocyanatosilane C) and with an aminosilane E), in which a urethanization reaction is carried out in the presence of at least one catalyst D) which is free of organically bonded tin,
wherein the process is conducted so that
first, some of the hydroxyl groups of the polyol component A) are reacted with the diisocyanate component B) and, after reaching a predetermined NCO content, in a second step the aminosilane is added and reacted with free NCO groups of an OH- and NCO-functional prepolymer obtained in the first step, wherein the aminosilane is added in such an amount that no free NCO groups are detectable in a reaction mixture any longer, and still-free hydroxyl groups of a reaction product are then finally reacted with the isocyanatosilane C),
wherein the catalyst D) comprises:
an organometallic compound of magnesium, zinc, gallium, scandium, lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, yttrium or lutetium, an organometallic compound being understood to be a compound which has at least one ligand bonded to the above mentioned metals via an oxygen atom, and the ligands being selected from the group consisting of alkoxy group, sulfonate group, carboxylate group, dialkylphosphate group, dialkylpyrophosphate group and β-diketonate group, where all ligands may be identical or different from each other,
or mixtures of the above mentioned compounds.