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    • 13. 发明公开
    • TUBE MULTICOUCHE POUR LE TRANSPORT D'EAU OU DE GAZ.
    • 多层管用于输送水或气体
    • EP2049332A2
    • 2009-04-22
    • EP07823699.9
    • 2007-08-07
    • ARKEMA FRANCE
    • BONNET, AnthonyLAPPRAND, AudeSEBIRE, Pascal
    • B32B27/30B32B1/08F24D3/14
    • B32B27/30B32B1/08B32B27/32C08L27/12F24D3/146C08L2666/24
    • The invention relates to a multilayer tube comprising (in the order starting from the inside to the outside of the tube) layers arranged one on top of the other: an optional layer L1 comprising at least one fluorinated polymer, preferably a PVDF; a layer L2 comprising at least one functionalized PVDF, obtained by radiation grafting of at least one unsaturated polar monomer onto a PVDF; an optional layer L3 of an adhesive binder; a layer L4 comprising at least one polyolefin optionally mixed with at least one functionalized polyolefin; an optional barrier layer L5; an optional layer L6 comprising at least polyolefin, optionally in a mixture with at least one functionalized polyolefin; characterized in that the PVDF onto which the unsaturated polar monomer is grafted is a VDF copolymer whose weight content is at least 50%, preferably at least 75% and at least one monomer copolymerisable with the VDF, having the following characteristics: a crystallization temperature Tc (measured by DSC as per the ISO Standard 11357-3) ranging from 50 to 120°C, preferably from 85 to 110°C; a constraint to the y threshold ranging from 10 to 40 MPa, preferably from 10 to 30 MPa; a viscosity v in the molten state (measured with a capillary rheometer at 230°C at 100 s-1) ranging from 100 to 1,500 Pa s, preferably from 400 to 1200 Pa s.