Method for producing polycarbonate polyols by the immortal polymerization of cyclic carbonates

US9260562B2 · kind B2 · utility

Assignee

• Bayer Intellectual Property GmbH · DE

Inventors

• Thomas Ernst Müller · Aachen, DE
• Christoph Gürtler · Cologne, DE
• Anthony Kermagoret · Guidel, FR
• Yvonne Dienes · Hannover, DE
• Igor Busygin · Mannheim, DE
• Burkhard Kohler · Leverkusen, DE
• Walter Leitner · Aachen, DE

Key dates

• Filing date: Nov 3, 2011
• Grant date: Feb 16, 2016
• Expiry date: Feb 12, 2032

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G64/38
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of polycarbonate polyols, characterized in that cyclic carbonates are polymerized in the presence of DMC catalysts and chain-transfer agents consisting of polyether carbonate polyols.