The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 14, 2026
Filed:
Jan. 27, 2021
Dow Global Technologies Llc, Midland, MI (US);
Anne-Catherine Bédard, Midland, MI (US);
Matthew E. Belowich, Midland, MI (US);
Mari S. Rosen, Houston, TX (US);
Sandra Varinia Bernales Candia, Midland, MI (US);
David A. Babb, Lake Jackson, TX (US);
Clark H. Cummins, Midland, MI (US);
Richard J. Keaton, Pearland, TX (US);
Matthew M. Yonkey, Sanford, MI (US);
Peter J. Waller, Midland, MI (US);
Dow Global Technologies LLC, Midland, MI (US);
Abstract
Polyethers are prepared by polymerizing an alkylene oxide in the presence of a starter, an aluminum compound that has at least one hydrocarbyl substituent, and a phosphorus-nitrogen base. The phosphorus-nitrogen base is present in only a small molar ratio relative to the amount of starter. The presence of such small amounts of phosphorus-nitrogen base greatly increases the catalytic activity of the system, compared to the case in which the aluminum compound is used by itself. The product polyethers have low amounts of unsaturated polyether impurities and little or no unwanted high molecular weight fraction. Polymers of propylene oxide have very low proportions of primary hydroxyl groups.