Solvay Solexis S.p.a.

Francesco Triulzi

Marco Apostolo

Vito Tortelli

Vincenzo Arcella

Marco Galimberti

Margherita Albano

Milena Stanga

Pierangelo Calini

VDF-based curable fluoroelastomers having glass transition temperature lower than &#x2212;35&#xb0; C. and an amount of &#x2014;COF end groups in the polymer lower than the sensitivity limit of the method using the FT-IR spectroscopy described in the present application.

Fluoroelastomers

VDF-based curable fluorelastomers, having a glass transition temperature from &#x2212;10&#xb0; C. to &#x2212;35&#xb0; C., comprising: B) monomer of formula: CF&#x2550;CFOCFOCF(a), C) one or more comonomers selected from: tetrafluoroethylene (TFE), per-fluoromethylvinylether (PMVE), perfluoropropene (HFP), and an amount of &#x2014;COF end groups in the polymer lower than the sensitivity limit of the method which uses the FT-IR spectroscopy described in the present application.

VDF-based curable fluoroelastomers, having a glass transition temperature lower than &#x2212;49&#xb0; C., preferably lower than &#x2212;50&#xb0; C., and having the following composition, as percent moles: A) from 25% to 50%, preferably from 30% to 45%, of the monomer of formula: CF2&#x2550;CFOCFOCF(a); B) one or more (per)fluorinated comonomers having at least one unsaturation of ethylene type in amounts from 75% to 50%; preferably from 70% to 55%; said one or more comonomers comprising vinylidene fluoride (VDF) in amounts from 50% to 75% on the total of the monomer moles; the sum of the molar percentages of the monomers being 100%; said fluoroelastomers containing an amount of &#x2014;COF end groups in the polymer lower than the sensitivity limit of the method reported in the description.

VDF curable fluoroelastomers, ionically cured, having a compression set after a time of 24 h (ASTM D 39/B) at &#x2212;10&#xb0; C. lower than 60%, preferably lower than 50% and at &#x2212;25&#xb0; C. lower than 90%, preferably lower than 75%, comprising hexafluoropropene (HFP) in amounts higher than 10% by moles and one vinylether of formula: CF&#x2550;CFOCFOCF(a), an amount of &#x2014;COF and groups in the polymer lower than the sensitivity limit of the method using the FT-IR spectroscopy described in the present application.

TFE-based thermoprocessable copolymers having the following composition, expressed in percentage by moles on the total of the monomers:

TFE-based thermoprocessable copolymers

Perfluoroelastomers curable by peroxidic way having glass transition temperature lower than &#x2212;10&#xb0; C. and an amount of &#x2014;COF end groups in the polymer lower than the sensitivity limit of the method using the IR spectroscopy in Fourier transform described in the present application.

Perfluoroelastomers

Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA): wherein R'is equal to Ror ORwherein Ris a linear or branched perfluoroalkyl radical having 1-5 carbon atoms; Xand X, equal to or different from each other, are F, CF; said polymers having a dioxole content&#x2267;95% by moles, having the following property combination:

Perfluorinated polymers

Amorphous perfluorinated homopolymers and copolymers of perfluorodioxoles of formula (IA):  wherein R'is equal to Ror ORwherein Ris a linear or branched perfluoroalkyl radical having 1&#x2013;5 carbon atoms; Xand X, equal to or different from each other, are F, CF; said polymers having a dioxole content &#x2267;95% by moles, having the following property combination:

Use of amorphous perfluorinated polymers for preparing transparent films at 157 nm, said perfluorinated polymers being free from unstable ionic end groups COF, COOH or their amidic derivatives, esters or salts, said polymers formed by cyclic units deriving from perfluorodioxoles of formula: 

Amorphous perfluorinated polymers

Amorphous perfluorinated copolymers, comprising cyclic perfluorinated units deriving from at least two different perfluorinated comonomers, optionally with units deriving from a perfluorinated monomer containing at least one olefinic unsaturation (perfluoroolefin), or comprising cyclic perfluorinated units and units deriving from a perfluorinated monomer containing at least one olefinic unsaturation, said perfluorinated copolymers having the following combination of properties:

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Milan, Italy

Francesco Triulzi