Preparation of amino polyols
CA 1261352 A · Owner: The Dow Chemical Company · Inventors: Klein, Howard P.; Mcdaniel, Kenneth G.; Brennan, Michael E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
PREPARATION OF AMINO POLYOLS, (D#80,430-F) ABSTRACT OF THE DISCLOSURE, An improved method for preparing amino polyols is disclosed. The method is the Mannich condensation of phenol formaldehyde and diethanolamine in a molar ratio of (1:1:1) and, then alkoxylation with a mixture of ethylene oxide and propylene oxide in a weight ratio of about 5:95 to 20:80 to form an amino polyol of hydroxyl number 440 to 515. The method gives higher yields of aromatic amino polyols of lower viscosity than those of the comparative example. RAM pg:EX7E/yy, pg:EX7E/yy
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted September 26, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 26, 2006.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.