Patent · US Expired

Double metal cyanide catalysts for producing polyether polyols

US6291388A · kind A · utility

18Cited by

7References

9Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Jörg Hofmann · Krefeld, DE
Pieter Ooms · Krefeld, DE
Pramod Gupta · Bedburg, DE
Walter Schafer · Leichlingen, DE

Key dates

Filing date	Sep 6, 2000
Grant date	Sep 18, 2001
Priority date	—
Expiry date	Sep 6, 2020

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08G65/2663
WIPO fieldMacromolecular chemistry, polymers
WIPO sectorChemistry

Abstract

The invention relates to new, improved double metal cyanide (DMC) catalysts for preparing polyetherpolyols by polyaddition of alkylene oxides to starter compounds containing active hydrogen atoms, wherein the catalyst contains a double metal cyanide compound, an organic coordination ligand and 5 to 80 wt. %, with respect to the amount of catalyst, of an ethylene oxide polyether with a number average molecular weight greater than 500. The new, improved catalysts have a greatly increased reactivity for polyetherpolyol preparation.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.