PROCESS FOR PRODUCING SIOC-BONDED, LINEAR POLYDIALKYLSILOXANE-POLYETHER BLOCK COPOLYMERS AND USE THEREOF
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United States of America Patent
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Oct 6, 2022
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Mar 28, 2022
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Mar 30, 2021
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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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