Process for stripping polymer polyols

US7790804B2 · kind B2 · utility

Assignee

• Bayer MaterialScience AG · DE

Inventors

• Michael Brockelt · Bensberg, DE
• Ludwig Deibele · Neunburg vorm Wald, DE
• Manfred Dietrich · Leverkusen, DE
• Markus Hadley · Pulheim, DE
• Jan Thomas Leu · Leichlingen, DE
• Guido Naberfeld · Via Enrico Fermi, US
• Ralf Dohrn · Bensberg, DE

Key dates

• Filing date: Jun 22, 2007
• Grant date: Sep 7, 2010
• Expiry date: Jun 8, 2028

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G2290/00
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

The invention provides a process for the purification of polymer polyols that ensures a reduction of acrylonitrile, styrene as well as the residual amounts of optionally used chain regulator, and of occurring recombination products of the initiator when azo initiators are used, to levels of <25 ppm of acrylonitrile, <50 ppm styrene, <50 ppm chain regulator and <280 ppm of recombination products by stripping using packed columns.