Solvay Specialty Polymers Italy S.p.a.

Marco Dossi

Giulio Brinati

Marco Avataneo

Claudia Manzoni

Pasqua Colaianna

Serena Carella

Matteo Fantoni

Giovanni Comino

Satchit Srinivasan

Martina Corasaniti

Laura Ponta

Terry Michael Kitchens

The invention pertains to certain perfluorinated thermoplastic elastomers suitable for being processed through additive manufacturing techniques, thanks to their surprising ability to possess better processability (notably more significant shear thinning at processability temperature) than corresponding perfluorinated thermoplasts, which possess similar product profile and hence performances, offering hence advantages in throughput and part design accurate control, containment of degradation, reduction of fumes, and yet delivering parts with outstanding chemical resistance.

Perfluorinated thermoplastic elastomer

The invention pertains to a fluoroelastomer composition comprising: (a) a vinylidene fluoride-based fluoroelastomer [fluoroelastomer (A)] comprising recurring units derived from vinylidene fluoride (VDF) and recurring units derived from at least one additional (per)fluorinated monomer; said fluoroelastomer (A): &#x2014;possessing a polydispersity index (IMWD) of between 1.5 and 3.5, &#x2014;comprising an amount of polar end groups of formula &#x2014;CFCHOH of at least 3 mmol/kg and at most 6 mmol/kg, and &#x2014;further comprising end of chain groups of formula &#x2014;CFH, &#x2014;CFCH, and, optionally, &#x2014;OC(o)&#x2014;R(with Rbeing a C-Calkyl group) in an amount such to satisfy the following inequality: [&#x2014;CFCHOH]+[&#x2014;CFH]+[&#x2014;CFCHH&#x2014;OC(o)R]&#x2264;30+(2&#xd7;10)/M, (b) at least one polyhydroxylated curing agent; (c) at least one accelerant; (d) at least one metal oxide selected from the group consisting of divalent metal oxides; and (e) optionally, at least one metal hydroxide, wherein the amount of said metal hydroxide, if present, is below 3 phr, based on 100 weight parts of fluoroelastomer (A).

Fluoroelastomer composition

The invention pertains to a method for manufacturing a fluoroelastomer (A), wherein fluoroelastomer (A) is a (per)fluoroelastomer, where such method includes

Method of manufacturing fluoroelastomers

The invention pertains to a method for emulsion polymerization of at least one fluoromonomer, said method comprising: (i) providing at least one aqueous emulsion comprising at least one surfactant and a monomer mixture [mixture (M)] comprising at least one fluoromonomer [monomer (F)] and optionally at least one additional monomer, and at least one RAFT/MADIX agent; (ii) initiating the polymerization of said monomer mixture in said aqueous emulsion adding at least one radical initiator; (iii) continuing the polymerization by adding additional amounts of said mixture (M) and said RAFT/MADIX agent, until converting the targeted amount of said mixture (M), and (iv) terminating the polymerization and recovering a latex of fluoropolymer [polymer (F)]; wherein the amount of RAFT/MADIX agent is comprised between 0.1 and 0.5% moles, with respect to the total amount of converted monomers of said monomer mixture, and wherein the amount of said RAFT/MADIX agent present in the aqueous emulsion when initiating the polymerization in step (ii) is of at most 50% with respect to the total amount of said RAFT/MADIX agent.

Method for the controlled polymerization of fluoromonomers

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Milan, Italy

Marco Dossi