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. 31, 1979
Filed:
May. 14, 1975
George Palethorpe, Durham, NC (US);
Monsanto Company, Decatur, AL (US);
Abstract
The process of continuously polymerizing acrylonitrile and other non-acidic mono-olefinic monomers with small amounts of certain acidic mono-olefinic monomers copolymerizable with acrylonitrile wherein the acrylonitrile and other non-acidic mono-olefinic monomers are continuously charged to a reactor and the acidic monomer is fed to the reactor in increments and in cycles, with a tall amount in a given cycle of 0.5 to 5 weight percent of the acidic monomer, based on total monomer weight fed in the cycle, being fed to the reactor during each cycle. Each cycle is made up of two time periods, with at least 65 percent of the acidic monomer being fed during the first time period and up to 35 percent being fed during the second time period. Preferably, all of the acidic monomer is fed to the reactor in the first time period. The first time period of the cycle is 5 to 25 percent of the second time period and the sum of first and second time periods, or cycle time, is about 15 to 25 percent of the reactor dwell time.