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:
Aug. 08, 1978
Filed:
Feb. 28, 1977
Applicant:
Inventors:
William J Settineri, Midland, MI (US);
Milton C Tolly, Hope, MI (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C08F / ;
U.S. Cl.
CPC ...
526 62 ; 427230 ;
Abstract
A process for retarding undesirable buildup of polymeric material on the internal surfaces of reactors used in the polymerization of substantially water-insoluble ethylenically unsaturated monomer, particularly vinyl chloride monomer, and for significantly reducing the tendency of reactor contents to foam during deoxygenation of such contents prior to subsequent polymerization reactions, such process comprising introducing sulfur trioxide into the reactor in an amount sufficient to provide at least about 0.045 grams of sulfur trioxide per gallon of reactor volume.