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:
Jan. 20, 1976
Filed:
Apr. 02, 1974
Francis Fournel, Chauny, FR;
Salomon Soussan, St-Fons, FR;
Rhone-Progil, Courbevoie, FR;
Abstract
A process for preparing polymers and copolymers containing vinyl chloride by bulk polymerization which includes feeding to a reaction zone of a vessel maintained at polymerization temperature (t.sub.1) a solution (A) comprising monomeric material to be polymerized and at least one polymerization initiator, solution (A) being prepared continuously immediately before being fed to the reaction zone by mixing a constituent (B) comprising at least 50% of the monomeric material at a temperature (t.sub.2) which is within 10.degree.C of t.sub.1, and a solution (C) of the initiator of initiators in an organic solvent which would include the remainder, if any, of the monomeric material, and in which, when the polymerization reaction is carried out in a two stage polymerization including a first pre-polymerization and a subsequent polymerization, the pre-polymerization reaction is carried out under a high stage of agitation while the polymerization step is carried out at a lower stage of agitation.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile