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:
Feb. 23, 1982
Filed:
Feb. 23, 1981
John L Gerlock, Dearborn, MI (US);
Jacob Braslaw, Southfield, MI (US);
Jane Albright, Bremerton, WA (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
Polyol is recovered from polyether based polyurethane foam by a process which includes reacting the foam with an alcohol, preferably a glycol ether, whose boiling point is between 225.degree. C. and 280.degree. C. at a temperature between 185.degree. C. and 220.degree. C. under a non-oxidizing atmosphere. Thereafter, superheated steam is bubbled through the solution to hydrolyze substantially all the carbamate produced during dissolution to amines and alcohols, preferably in the presence of sodium hydroxide. During hydrolysis, the temperature of the solution is maintained at between 185.degree. C. and 220.degree. C. and the solution volume is maintained by adding alcohol to replace that removed by the steam. At least a portion of the solution is subjected to vacuum purification at a temperature below about 230.degree. C. The portion of the solution subjected to vacuum purification may be the polyol layer which forms after the hydrolyzed solution has been allowed to stand. Substantially pure polyol is recovered.