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:
Mar. 02, 1982
Filed:
Feb. 23, 1981
John L Gerlock, Dearborn, MI (US);
Jacob Braslaw, Southfield; both of, MI (US);
Jane Albright, Bremerton, WA (US);
Ford Motor Company, Dearborn, MI (US);
Abstract
Polyol is recovered from polyurethane waste foam and thereafter used to produce high quality new foam. The foam is dissolved in a saturated alcohol, preferably diethylene glycol, having a boiling point between 220.degree. C. and 280.degree. C. at a temperature between 185.degree. C. and 220.degree. C. under a non-oxidizing atmosphere such as nitrogen. Water and an alkali metal hydroxide catalyst, preferably sodium hydroxide, are added to the solution which is then refluxed at a temperature of between about 175.degree. C. and 220.degree. C. still under a non-oxidizing atmosphere until all the carbamates produced during dissolution have been hydrolyzed to amines and alcohol. At least a portion of the solution is subjected to vacuum purification at a temperature below about 230.degree. C. Substantially pure polyol is recovered. Preferably, prior to vacuum distillation, water is removed from the solution.