Process for the preparation of polyorganosiloxanes

US12060459B2 · kind B2 · utility

Assignee

• Henkel AG & Co. KGaA · DE

Inventors

• Christina Despotopoulou · Minneapolis, US
• Johann Klein · Goldkronach, DE
• Therese Hemery · Wiesbaden, DE
• Esteban Mejia · Rostock, DE
• Udo Kragl · Kritzmow, DE
• Theresia Koehler · Rostock, DE
• Lea Grefe · Rostock, DE

Key dates

• Filing date: Jan 26, 2021
• Grant date: Aug 13, 2024
• Expiry date: Dec 9, 2042

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2170/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for preparing polyorganosiloxanes by (i) condensation polymerization of at least one linear organosiloxane which has at least one hydroxy group or hydrolysable group bound to a silicon atom, (ii) ring-opening polymerization of at least one cyclosiloxane, or (iii) ring-opening polymerization and condensation polymerization of a mixture of at least one linear organosiloxane which has at least one hydroxy group or hydrolysable group bound to a silicon atom and at least one cyclosiloxane with a basic initiator and a hydroxy group-containing compound in the presence of a polar aprotic solvent, wherein the obtained polyorganosiloxanes are not miscible in the polar aprotic solvent at room temperature.