Multilayer assembly

Abstract

A multilayer assembly comprising a first inner layer (L1) made from a first composition (C1), said first composition (C1) comprising at least one polymer comprising recurring units derived from ethylene (E) and from chlorotrifluoroethylene (CTFE), and at least one Ti compound; and a second outer layer (L2) made from a second composition, said second composition (C2) being free from TiO 2 -containing additives, said second composition (C2) comprising at least one semi-crystalline polymer (A) comprising recurring units derived from ethylene and from at least one fluoromonomer selected from chlorotrifluoroethylene (CTFE), tetrafluoroethylene (TFE) and mixtures thereof, said semi-crystalline polymer (A) having a heat of fusion of at least 35 J/g.

1 . A multilayer assembly comprising:
 a first inner layer (L1) made from a first composition (C1), said first composition (C1) comprising:
 at least one polymer comprising recurring units derived from-ethylene (E) and from chlorotrifluoroethylene (CTFE), and 
 at least one Ti compound; and 
   a second outer layer (L2) made from a second composition, said second composition (C2) being free from TiO 2 -containing additives, said second composition (C2) comprising at least one semi-crystalline polymer (A) comprising recurring units derived from ethylene and from at least one fluoromonomer selected from chlorotrifluoroethylene (CTFE), tetrafluoroethylene (TFE) and mixtures thereof, said semi-crystalline polymer (A) having a heat of fusion of at least 35 J/g.   
     
     
         2 . The multilayer assembly of  claim 1 , wherein said semi-crystalline polymer (A) of said second composition (C2) comprises:
 (a) from 45 to 55% by moles of ethylene (E);   (b) from 55 to 45% by moles of chlorotrifluoroethylene (CTFE), tetrafluoroethylene (TFE) or their mixture; and   (c) from 0 to 5% by moles, based on the total amount of monomers (a) and (b) of one or more fluorinated and/or hydrogenated comonomer(s).   
     
     
         3 . The multilayer assembly of  claim 1 , wherein said semi-crystalline polymer (A) of said second composition (C2) is an ECTFE polymer possessing a melting temperature exceeding 220° C. 
     
     
         4 . The multilayer assembly of  claim 3 , wherein said semi-crystalline polymer (A) of said second composition (C2) consists essentially of:
 (a) from 48 to 52% by moles of ethylene (E);   (b) from 52 to 48% by moles of chlorotrifluoroethylene (CTFE).   
     
     
         5 . The multilayer assembly of  claim 1 , wherein said second composition (C2) comprises said semi-crystalline polymer (A) as sole polymer component. 
     
     
         6 . The multilayer assembly of  claim 1 , wherein said second outer layer (L2) has a thickness of at least 5 μm. 
     
     
         7 . The multilayer assembly of  claim 1 , wherein the ECTFE polymer of said first composition (C1) comprises:
 (a) from 10 to 90%, by moles of E;   (b) from 90 to 10%, by moles of CTFE; and   (c) from 0 to 30%, by moles, based on the total amounts of monomers (a) and (b), of one or more fluorinated and/or hydrogenated comonomer(s).   
     
     
         8 . The multilayer assembly of  claim 7 , wherein the ECTFE polymer of said first composition (C1) consists essentially of:
 (a) from 35 to 47% by moles of E;   (b) from 53 to 65% by moles of CTFE.   
     
     
         9 . The multilayer assembly of  claim 1 , wherein the Ti compound is an inorganic compound comprising TiO 2 . 
     
     
         10 . The multilayer assembly of  claim 9 , wherein the Ti compound is an inorganic UV blocker compound made of particles comprising:
 a core consisting essentially of TiO 2 , and   a shell consisting essentially of at least one oxide of Si, Al or mixture thereof.   
     
     
         11 . The multilayer assembly of  claim 1 , further comprising a third layer (L3) adhering to said first inner layer (L1) on the opposite side of said second outer layer (L2). 
     
     
         12 . The multilayer assembly of  claim 11 , wherein said third layer (L3) is made from a said third composition (C3) identical to said second composition (C2). 
     
     
         13 . A method for manufacturing the multilayer assembly of  claim 1 , said method comprising at least one techniques selected from the group consisting of colaminating, coextrusion, extrusion-coating, coating, overinjection-moulding and coinjection moulding. 
     
     
         14 . (canceled) 
     
     
         15 . A method for manufacturing tubes, pipes, cladding, films, sheets, profiles, plaques or hollow bodies, comprising using the multilayer assembly according to  claim 1 . 
     
     
         16 . A method for protecting a PV module including covering said module with at least one multilayer assembly according to  claim 1 . 
     
     
         17 . A method for producing high barrier composite films, comprising adhering the multilayer assembly according to  claim 1  onto a polyethylene terephthalate (PET) or polyethylene naphthalate (PEN) film through the use of an adhesive selected from epoxy or urethane glues.