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:
Oct. 19, 1976
Filed:
Jul. 08, 1974
Societa' Italiana Resine S.I.R. S.p.A., Milan, IT;
Abstract
A continuous process for polymerizing acrylonitrile monomer or copolymerizing a mixture of acrylonitrile monomer and a further ethylenically unsaturated monomer copolymerizable therewith in an aqueous medium and in the presence of a catalytic redox system through a primary and a secondary polymerization step. The primary step is carried out in a plurality of independent distinct reaction zones connected in parallel and operated under similar conditions, in which the conversion of the monomer or mixture of monomers is maintained at a value not exceeding 70%. The secondary step is carried out in a single reaction zone connected in series with each of the primary zones. The conversion of the monomer or mixture of monomers in the secondary zone is maintained at a value not exceeding 80% with respect to the overall feed of monomer or mixture of monomers to the primary zones.