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. 20, 1979
Filed:
Jul. 03, 1978
Applicant:
Inventors:
Dean R Weimer, Ponca City, OK (US);
Kenneth D Freshour, Oklahoma City, OK (US);
Assignee:
Continental Oil Company, Ponca City, OK (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526 62 ; 526 74 ;
Abstract
Polymer buildup in polymerization reactions during vinyl chloride polymerizations is greatly reduced by applying a water dispersion of alumina and oxalyl bis(benzylidenehydrazide) (OABH) to the reactor surfaces exposed to the polymerization medium prior to carrying out the polymerization. Long term effects of the buildup preventor can be obtained by applying a caustic wash to the reactor walls, prior to applying the oxalyl bis(benzylidenehydrazide) and alumina dispersion. The effect of the OABH/alumina and caustic is synergistic since the preventative effect is greater than either material used alone.