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公开(公告)号：US20220315709A1
公开(公告)日：2022-10-06
申请号：US17706552
申请日：2022-03-28
Applicant: Evonik Operations GmbH
Inventor： Thomas Reibold , Matthias Lobert , Michael Klostermann , Michelle Eckhoff
Abstract: Process for producing SiOC-bonded, linear polydialkylsiloxane-polyoxyalkylene block copolymers comprising repeating (AB) units comprising the reaction of a linear, α,ω-(SiH)-functional polydialkylsiloxane (a) with a linear α,ω-(OH)-functional polyoxyalkylene (b) using one or more compounds of elements of main group III and/or the 3rd transition group as catalyst (c), optionally in the presence of a solvent (d), wherein the two reactants (a) and (b) preferably in equimolar amounts and with controlled hydrogen evolution are reacted to quantitative SiH conversion.
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公开(公告)号：US20220185967A1
公开(公告)日：2022-06-16
申请号：US17523059
申请日：2021-11-10
Applicant: Evonik Operations GmbH
Inventor： Michael Ferenz , Michael Klostermann , Kai-Oliver Feldmann , Petra Schnell , Michelle Eckhoff
Abstract: A process for preparing polyether-siloxane block copolymers by hydrosilylation of alpha,omega-modified hydrosiloxanes with alpha,omega-modified di(meth)allyl polyethers in the presence of a hydrosilylation catalyst, wherein the reaction is performed in a solvent mixture comprising aromatic solvents, polyethers and alkoxylated alcohol, is described.
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公开(公告)号：US12252588B2
公开(公告)日：2025-03-18
申请号：US17523059
申请日：2021-11-10
Applicant: Evonik Operations GmbH
Inventor： Michael Ferenz , Michael Klostermann , Kai-Oliver Feldmann , Petra Schnell , Michelle Eckhoff
IPC: C08G77/46 , C08G77/08 , C08G77/12 , C08G101/00 , C08J9/00
Abstract: A process for preparing polyether-siloxane block copolymers by hydrosilylation of alpha,omega-modified hydrosiloxanes with alpha,omega-modified di(meth)allyl polyethers in the presence of a hydrosilylation catalyst, wherein the reaction is performed in a solvent mixture comprising aromatic solvents, polyethers and alkoxylated alcohol, is described.
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