Thermoplastic fluoropolymers

Details Thermoplastic fluoropolymers Thermoplastic fluoropolymers

C - Chemistry, Metallurgy

08

L

C08L 27/12 (2006.01) C08F 255/02 (2006.01) C08F 259/08 (2006.01) C08L 23/08 (2006.01) C08L 27/18 (2006.01)

Patent

CA 2337453

There is described a polymer composition comprising a mixture of polymers. Component (A) comprises (co)polymers based on chlo-rotrifluoroethylene (PCTFE) containing at least 99% by moles of chlorotrifluoroethylene (CTFE), the complement to 100 being one or more fluorinated or non-fluorinated monomers or based on CTFE homopolymer. Component (B) comprises (co)polymers based on ethylene/chlorotrifluoroethylene (ECTFE) and/or ethyle-ne/tetrafluoroethylene (ETFE) optionally containing one or more fluorinated or non-fluorinated comonomer wherein the E:CTFE (or TFE) ratio by moles is between 1:3 and 3:1. The polymer composition has improved mechanical properties in combination with low permeability to gases and water vapour rendering the composition useful to obtain, in particular, films used in the food and pharmaceutical industry.

La présente invention a pour objet une composition de polymère comprenant un mélange de polymères. Le constituant (A) comprend des (co)polymères à base de chlorotrifluoroéthylène (PCTFE) contenant au moins 99 % en moles de chlorotrifluoroéthylène (CTFE), le reste étant un ou des monomères fluorés ou non fluorés ou à base d'homopolymère de CTFE. Le constituant (B) comprend des (co)polymères à base d'éthylène/chlorotrifluoroéthylène (ECTFE) et/ou d'éthylène/tétrafluoroéthylène (ETFE) contenant éventuellement un ou des comonomères fluorés ou non fluorés où le rapport molaire E:CTFE (ou TFE) est compris entre 1:3 et 3:1. La composition de polymère présente des propriétés mécaniques améliorées ainsi qu'une faible perméabilité aux gaz et à l'eau, ce qui la rend utile pour obtenir, notamment, des films utilisés dans les industries alimentaire et pharmaceutique.

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