US 12,460,020 B2
Process for polymerizing fluoromonomers using a combination of fluorinated and nonfluorinated surfactant
Rajeev Chauhan, Bharuch (IN); Gaurav Kumar, Bharuch (IN); P.S. Rao, Bharuch (IN); Navin Soni, Bharuch (IN); B.S. Bhattacharya, Bharuch (IN); Anamika Dutta, Bharuch (IN); and Anand Mohan Patel, Bharuch (IN)
Assigned to GUJARAT FLUOROCHEMICALS LIMITED, Noida (IN)
Appl. No. 17/913,244
Filed by GUJARAT FLUOROCHEMICALS LIMITED, Noida (IN)
PCT Filed May 14, 2021, PCT No. PCT/IB2021/054157
§ 371(c)(1), (2) Date Sep. 21, 2022,
PCT Pub. No. WO2021/229530, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 202011020337 (IN), filed on May 14, 2020.
Prior Publication US 2023/0151122 A1, May 18, 2023
Int. Cl. C08F 2/22 (2006.01); C08F 2/00 (2006.01); C08F 2/26 (2006.01); C08F 14/26 (2006.01); C08F 114/26 (2006.01); C08K 5/14 (2006.01)
CPC C08F 2/26 (2013.01) [C08F 2/001 (2013.01); C08F 114/26 (2013.01); C08K 5/14 (2013.01)] 10 Claims
 
1. A process for polymerizing fluoromonomers in an aqueous dispersion medium to form a fluoropolymer, comprising the following steps:
a) forming an aqueous solution comprising a first surfactant combination of at least one fluorinated surfactant and at least one non-fluorinated surfactant in a polymerization reactor;
b) pressurizing the polymerization reactor with said fluoromonomers;
c) initiating a polymerization reaction of said fluoromonomers with initiator selected from Potassium permanganate (KMnO4), Disuccinic Acid Peroxide (DSAP), Ammonium Persulphate (APS), redox initiators or combinations thereof to form said fluoropolymer;
d) propagation of said polymerization reaction, wherein a second surfactant combination of at least one fluorinated surfactant and at least one non-fluorinated surfactant is metered or in one shot dose into the polymerization reactor;
e) termination of said polymerization reaction after consumption of a desired quantity of said fluoromonomers;
wherein, the proportions between the at least one fluorinated surfactant and the at least one non-fluorinated surfactant within the first surfactant combination are either the same or different from the proportions between the at least one fluorinated surfactant and the at least one non-fluorinated surfactant within the second surfactant combination.