Patent ID: 9732212
Date: 2017-08-15
CPC Classifications: C08F,C08G,C08J,C08K,C08L

Claim:
1. A process comprising polymerizing at least one fluorinated monomer in an aqueous medium containing initiator and polymerization agent to form an aqueous dispersion of fluoropolymer particles, wherein said polymerization agent comprises a mixture of fluoropolyether acids or salts having a number average molecular weight of about 800 to about 2500 g/mol; wherein the amount of fluoropolyether acids or salt in said mixture having a molecular weight of not more than 500 g/mol is not more than 50 ppm by weight of the total amount of fluoropolyether acids or salts in said mixture; wherein the amount of fluoropolyether acids or salts in said mixture having a molecular weight of 2500 g/mol or greater is not more than 40% by weight of the total amount of fluoropolyether acids or salts in said mixture; and wherein the amount of fluoropolyether acids or salts in said mixture having a molecular weight of 2986.6 g/mol or greater is not more than 10% by weight of the total amount of fluoropolyether acids or salts in said mixture.