US Patent Issued to Evonik Operations on March 18 for "Polyether-siloxane block copolymers for the production of polyurethane foams" (German Inventors)

ALEXANDRIA, Va., March 19 -- United States Patent no. 12,252,588, issued on March 18, was assigned to Evonik Operations GmbH (Essen, Germany).

"Polyether-siloxane block copolymers for the production of polyurethane foams" was invented by Michael Ferenz (Essen, Germany), Michael Klostermann (Essen, Germany), Kai-Oliver Feldmann (Essen, Germany), Petra Schnell (Essen, Germany) and Michelle Eckhoff (Essen, Germany).

According to the abstract* released by the U.S. Patent & Trademark Office: "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 ...