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. 13, 2019
Filed:
May. 11, 2015
Solvay Specialty Polymers Italy S.p.a., Bollate, IT;
SOLVAY SPECIALTY POLYMERS ITALY S.P.A., Bollate (Milan), IT;
Abstract
The invention pertains to a method for emulsion polymerization of at least one fluoromonomer, said method comprising: (i) providing at least one aqueous emulsion comprising at least one surfactant and a monomer mixture [mixture (M)] comprising at least one fluoromonomer [monomer (F)] and optionally at least one additional monomer, and at least one RAFT/MADIX agent; (ii) initiating the polymerization of said monomer mixture in said aqueous emulsion adding at least one radical initiator; (iii) continuing the polymerization by adding additional amounts of said mixture (M) and said RAFT/MADIX agent, until converting the targeted amount of said mixture (M), and (iv) terminating the polymerization and recovering a latex of fluoropolymer [polymer (F)]; wherein the amount of RAFT/MADIX agent is comprised between 0.1 and 0.5% moles, with respect to the total amount of converted monomers of said monomer mixture, and wherein the amount of said RAFT/MADIX agent present in the aqueous emulsion when initiating the polymerization in step (ii) is of at most 50% with respect to the total amount of said RAFT/MADIX agent.