Multilayer assembly

Patent metadata

Field	Value
Publication number	US-11338558-B2
Application number	US-201916525178-A
Country	US
Kind code	B2
Filing date	Jul 29, 2019
Priority date	Oct 15, 2010
Publication date	May 24, 2022
Grant date	May 24, 2022

Abstract

The invention pertains to a multilayer assembly comprising:(L1) a first inner layer [layer (L1)] made from a first composition [composition (C1)], said composition (C1) comprising:at least one polymer comprising recurring units derived from ethylene (E) and from chlorotrifluoroethylene (CTFE), andat least one Ti compound; and(L2) a second outer layer [layer (L2)] made from a second composition [composition (C2)], said composition (C2) being substantially free from TiO2-containing additives, said second composition comprising at least one semi-crystalline polymer 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 having a heat of fusion of at least 35 J/g [polymer (A)].

First claim

The invention claimed is:

1. A multilayer assembly comprising:
a first inner layer (L1) made from a first composition (C1), said first composition (C1) comprising:
at least one ECTFE polymer comprising recurring units derived from ethylene (E) and from chlorotrifluoroethylene (CTFE), said polymer's composition comprising:
(a) from 35 to 47% by moles of E; and
(b) from 53 to 65% by moles of CTFE, and

at least one Ti compound that is an inorganic UV blocker compound consisting 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; and

a second outer layer (L2) made from a second composition (C2), 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 having a heat of fusion of at least 35 J/g, wherein the semi-crystalline polymer (A) of second composition (C2) consists essentially of:
(a) from 48 to 52% by moles of ethylene (E); and
(b) from 52 to 48% by moles of chlorotrifluoroethylene (CTFE).

2. The multilayer assembly of claim 1 , wherein semi-crystalline polymer (A) of second composition (C2) is an ECTFE polymer possessing a melting temperature exceeding 220° C.

3. The multilayer assembly of claim 1 , wherein the second composition (C2) comprises semi-crystalline polymer (A) as sole polymer component.

4. The multilayer assembly of claim 1 , wherein layer (L2) has a thickness of at least 5 μm.

5. The multilayer assembly of claim 1 , further comprising a third layer (L3) adhering to the first inner layer (L1) on the side opposite the second outer layer (L2).

6. The multilayer assembly of claim 5 , wherein the third layer (L3) is made from a third composition (C3) identical to the second composition (C2).

7. A method for manufacturing the multilayer assembly of claim 1 , the method comprising at least one technique selected from the group consisting of colaminating, coextruding, extrusion-coating, coating, overinjection-moulding and coinjection moulding.

8. A method for manufacturing tubes, pipes, cladding, films, sheets, profiles, plaques or hollow bodies, comprising using the multilayer assembly according to claim 1 .

9. A method for protecting a PV module, the method comprising covering said module with at least one multilayer assembly according to claim 1 .

10. A method for producing high barrier composite films, the method 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.

11. The multilayer assembly of claim 1 , wherein the ECTFE polymer of first composition (C1) has a heat of fusion of less than 35 J/g.

Assignees

• Solvay Specialty Polymers It

Inventors

• Carella Serena
• Bassi Mattia
• Mortara Stefano
• Toniolo Paolo
• Abusleme Julio A

Classifications

• H10F19/85

  Protective back sheets · CPC title

• H10F19/80

  Encapsulations or containers for integrated devices, or assemblies of multiple devices, having photovoltaic cells · CPC title

• H10F19/804

  Materials of encapsulations · CPC title

• C08K3/014

  Stabilisers against oxidation, heat, light or ozone · CPC title

• C08K2003/2241

  Titanium dioxide · CPC title