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:
Jul. 04, 1994
Filed:
Jun. 02, 1992
Applicant:
Inventor:
Leslie M Blair, Parkersburg, WV (US);
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08G / ;
U.S. Cl.
CPC ...
528230 ; 549368 ;
Abstract
This invention relates to an aqueous process for recycling polyacetal, and moldings thereof, into formaldehyde monomer solution, said process occurring at elevated temperature and pressure and in the presence of an acid decomposition catalyst, such as sulfuric acid. The resultant formaldehyde monomer solution can be reacted to form trioxane and then be cycled into a trioxane-based polyacetal manufacturing process or, alternatively, it can be further treated and then be cycled into a formaldehyde-monomer-based polyacetal manufacturing process.