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:
May. 11, 1993
Filed:
May. 18, 1992
Applicant:
Inventors:
Andrew P Kahn, Wayne, PA (US);
Robert G Gastinger, West Chester, PA (US);
Gangfeng Cai, West Chester, PA (US);
Assignee:
ARCO Chemical Technology, L.P., Wilmington, DE (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560240 ; 568617 ; 264 60 ; 502 56 ; 502 81 ;
Abstract
Tetrahydrofuran is polymerized in the presence of a carboxylic acid anhydride and a solid acid catalyst that has been calcined at a temperature greater than about 600.degree. C. Calcined bleaching earth catalysts give THF polymer products having a narrow molecular weight distribution; calcining amorphous silica-aluminas improves their activity toward THF polymerization.