Method for manufacturing fluoroelastomers
AssigneeSYENSQO SPECIALTY POLYMERS ITALY S.p.A.
InventorsDaniela Bertani, Matteo Fantoni, Mirko Tavano
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Abstract
The present invention relates to a method for manufacturing fluoroelastomers having iodinated/brominated chain ends, notably vinylidene fluoride (VDF)-based fluoroelastomers, in emulsion polymerization whereas no addition of fluorosurfactants or hydrogenated surfactants is required, and to a fluoroelastomers which can be obtained from said method.
Claims10
-5. (canceled)
An aqueous latex, comprising particles of at least one fluoroelastomer (A) which is a (per)fluoroelastomer comprising Iodine and/or Bromine chain ends, wherein said fluoroelastomer (A) comprises recurring units derived from VDF and from at least one monomer (MF) different from VDF, wherein said fluoroelastomer (A):
- possesses a Mooney viscosity (ML) (1+10) at 121° C. of at least 10 MU;
- comprises —CH2OH chain ends in an amount of zero to less than 5 mmol/kg of fluoroelastomer (A);
- comprises hydrogen-comprising chain ends selected from the group consisting of —CF2H and —CF2CH3 in an amount of 0.01 to 10 mmol/kg of fluoroelastomer (A);
- comprises I/Br containing chain ends of formula —CH2—X (with X being I or Br) in an amount of at least 65% moles, with respect to the total moles of chain ends,
- wherein said latex is produced by emulsion polymerization without addition of any fluorinated surfactant or hydrogenated surfactants.
A fluoroelastomer (A) which is a (per)fluoroelastomer comprising Iodine and/or Bromine chain ends, wherein said fluoroelastomer (A) comprises recurring units derived from VDF and from at least one monomer (MF) different from VDF, wherein said fluoroelastomer (A):
- possesses a Mooney viscosity (ML) (1+10) at 121° C. of at least 10 MU;
- comprises —CH2OH chain ends in an amount of zero to less than 5 mmol/kg of fluoroelastomer (A);
- comprises hydrogen-comprising chain ends selected from the group consisting of —CF2H and —CF2CH3 in an amount of 0.01 to 10 mmol/kg of fluoroelastomer (A);
- comprises I/Br containing chain ends of formula —CH2—X (with X being I or Br in an amount of at least 65% moles, with respect to the total moles of chain ends,
- wherein said fluoroelastomer is produced by emulsion polymerization without addition of any fluorinated surfactant or hydrogenated surfactants.
Dependencies are inferred from the claim text.