Method for manufacturing partially fluorinated polymers
AssigneeSolvay Specialty Polymers Italy S.P.A.
InventorsLiubov Chernysheva, Serena Carella, Matteo Fantoni
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Abstract
The present invention relates to a method for manufacturing of partially fluorinated polymers, notably vinylidene fluoride (VDF)-based polymers, in emulsion polymerization, and to a polymer obtained from said method.
Claims15
A method for the synthesis of a partially fluorinated polymer (P) comprising recurring units derived from 1,1-difluoroethylene, said method comprising polymerizing 1,1-difluoroethylene, optionally in the presence of at least one further (per)fluorinated monomer (MF), in an aqueous emulsion in the presence of a redox-initiating system (R) comprising at least one organic radical initiator and at least one composition (CS) comprising at least one compound (S) bearing at least one sulfinic acid group, wherein said compound (S) complies with the following formula (S—I):
- wherein
- M is a hydrogen atom, an ammonium ion, or a monovalent metal ion;
- R20 is —OH or —N(R4)(R5) where each of R4 and R5, identical or different from one another, are a hydrogen atom or a linear or branched alkyl chain having from 1 to 6 carbon atoms;
- R21 is a hydrogen atom, a linear or branched alkyl group having from 1 to 6 carbon atoms, a 5- or 6-membered cycloalkyl group, or a 5-or 6-membered aryl group;
- R22 is —COOM, —SO3M, —C(═O)R4, —C(═O)N(R4)(R5), or —C(═O)OR4, wherein M, R4 and R5 are as defined above.
A polymerization reaction system comprising:
- 1,1-difluoroethylene, optionally in the presence of at least one further (per)fluorinated monomer (MF);
- and
- a redox-initiating system comprising a composition (CS) comprising at least one compound (S) bearing at least one sulfinic acid group, wherein said compound (S) complies with the following formula (S—I):
- wherein
- M is a hydrogen atom, an ammonium ion, or a monovalent metal ion;
- R20 is —OH or —N(R4)(R5) where each of R4 and R5, identical or different from one another, are a hydrogen atom or a linear or branched alkyl chain having from 1 to 6 carbon atoms;
- R21 is a hydrogen atom, a linear or branched alkyl group having from 1 to 6 carbon atoms, a 5- or 6-membered cycloalkyl group, or a 5-or 6-membered aryl group;
- R22 is —COOM, —SO3M, —C(═O)R4, —C(═O)N(R4)(R5), or —C(═O)OR4, wherein M,
- R4 and R5 are as defined above.
Dependencies are inferred from the claim text.