Method of manufacturing fluoroelastomers

A method for manufacturing fluoroelastomer (A), wherein fluoroelastomer (A) is a (per)fluoroelastomer, the method comprising:

• (a):
• polymerizing in an aqueous emulsion in the presence of a surfactant by feeding the following ingredients into a first reactor:
• (i) a monomer mixture (M1) comprising at least one monomer (F), wherein monomer (F) is a fluoromonomer,
• (ii) at least one iodinated and/or brominated chain-transfer agent(s),
• (iii) at least one branching agent possessing at least two ethylenic unsaturations;
• and
• (iv) at least one radical initiator,
• so as to obtain a pre-polymer latex (P), wherein pre-polymer latex (P) comprises particles of a pre-polymer having a number-averaged molecular weight of at least 1000 and at most 40000;
• (b):
• recovering latex (P) from the first reactor and storing the recovered latex (P) in a storage tank;
• (c):
• feeding the recovered latex (P) from the storage tank into a second reactor;
• (d):
• polymerizing in the second reactor at least a second monomer mixture (M2) comprising at least one monomer (F) in the presence of a radical initiator, so as to obtain a final latex (F);
• and
• (e):
• recovering fluoroelastomer (A) from latex (F).