Process for preparing polyether polyol using DMC catalyst and continuous addition of starter

US10767009B2 · kind B2 · utility

Assignee

• Covestro LLC · US

Inventors

• Jean-Paul Masy · Laarne, BE
• Carlos M. Villa · Freeport, US
• David A. Babb · Lake Jackson, US
• John W. Weston · Sugar Land, US
• Sweta Somasi · Indianapolis, US

Key dates

• Filing date: Jun 20, 2016
• Grant date: Sep 8, 2020
• Expiry date: Aug 23, 2036

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2110/0025
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

Polyether polyols are made by a process that includes a continuous addition of starter and alkylene oxide. The feed of starter is discontinued when 80 to 95% of the alkylene oxide has been fed to the reactor. This process produces a product with a narrow molecular weight distribution.