Multilayer assembly comprising silane-grafted polyolefin

A photovoltaic cell comprising at least a front sheet layer (a) and a first encapsulant layer (b) forming a multilayer composition wherein:

• layer (a) is at least one layer of glass, of a metal or of a polymeric material (PM), and layer (b) is a least one polymeric layer comprising a cross-linked polyolefin (XPO) obtained by hydrolysis and condensation of a cross-linkable polyolefin (SPO) having one or more backbone chains consisting of recurring units derived from ethylene and octene and comprising hydrolysable silane groups, the cross-linkable polymer (SPO) being obtained from the reaction of:
• cross linkable polymer (SPO) comprising hydrolysable silane groups that is obtainable from reaction of:
• an olefin silane (OS) of formula R1R2R3SiY, wherein Y is vinyl, R1, R2 and R3 are, independently from each other, a C1-C4 alkoxy group, with
• a blend (CB) of at least two copolymers (c1) and (c2) each of ethylene and octene, wherein:
• the melt flow rate (MFR) of (c1) is lower than 6 g/10 min, but not lower than 1 g/10 min and the MFR of (c2) is 15 g/10 min or higher, but not higher than 70 g/10 min, as measured at 190° C. and 2.16 kg according to ISO 1133;
• the weight ratio of (c1):
• (c2) in (CB) is from 70:30 to 60:40;
• wherein the cross-linkable polyolefin (SPO) comprises from 1.4% to 1.8% by weight of hydrolysable silane groups, based on the total weight of (SPO);
• and
• wherein b) adheres directly to at least a portion of (a) and (PM) is different from (XPO).