Film with moderate crosslinking

Abstract

A polymer composition with a polymer of ethylene with a comonomer with silane group(s) containing units and an additive that is an organic compound with at least one amine moiety that has a gel content less than 10 wt % after 7 days at ambient conditions and a gel content of at least 15 wt % gel content after 14 days at 100° C. The film can be used in a laminate.

1 . A film comprising a polymer composition:
 a polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable and   at least one additive (b), wherein the additive is an organic compound which comprises at least one amine moiety   wherein the film has a gel content less than 10 wt % after 7 days at ambient conditions and a gel content of at least 15 wt % after 14 days at 100° C., when measured as described in “Gel content (wt %)”.   
     
     
         2 . A film according to  claim 1 , wherein the polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable is in an amount of at least 80 wt % of the polymer composition. 
     
     
         3 . A film according to  claim 1 , wherein the polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable has a density of at least 900 kg/m 3  and an MFR 2  of 0.1 to 50 g/10 min measured with ISO 1330 at 190° C. and a load of 2.16 kg,
 whereby the density is determined according to ISO 1183D and ISA1872-2 for sample preparation. 
 
     
     
         4 . A film according to  claim 1 , wherein the polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable is a low density polyethylene. 
     
     
         5 . A film according to  claim 1 , wherein the polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable is comprising further polar comonomers (c), excluding comonomers with silane group(s) containing units that are hydrolysable. 
     
     
         6 . A film according to  claim 5 , wherein the polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable is further comprising a total amount of polar comonomers (c), excluding comonomers with silane group(s) containing units that are hydrolysable is from 10 wt % to 30 wt %. 
     
     
         7 . A film according to  claim 6 . wherein the polar comonomers (c), excluding silane group(s) containing units, is selected from VA, BA, MA, MMA & EA suitably MA & MMA. 
     
     
         8 . A film according to  claim 1 , wherein the total amount of silane monomer in the polymer of ethylene (a) with a comonomer with silane group(s) containing units that are hydrolysable is from 0.1 wt % to 15 wt %. 
     
     
         9 . A film according to  claim 1 , wherein the additive (b) comprising at least one amine moiety is a stabiliser with at least one UV agent. 
     
     
         10 . A film according to  claim 1 , wherein the polymer composition comprising an UV stabiliser and an antioxidant is present in an amount of 0.1 wt % to 5 wt %. 
     
     
         11 . A film according to  claim 1 , wherein the additive (b) comprising at least one amine moiety. 
     
     
         12 . Process for making a laminate comprising:
 providing a polymer composition as in  claim 1 ,   extruding the polymer composition to form a film that has gel content less than 10 wt % after 7 days at ambient conditions, when measured as described in “Test methods”, and   laminating the film without any peroxide decomposition.   
     
     
         13 . Process according to  claim 12  wherein the additive (b) comprising at least one amine moiety is added to the polyethylene composition during film extrusion. 
     
     
         14 . A laminate with a front glass layer with at least one layer that is made of a polyethylene composition comprising:
 (a) a polyethylene bearing hydrolysable silane group(s) and   (b) at least one additive, wherein the additive is an organic compound which comprises at least one amine moiety and wherein the polymer composition has creep less than <10 mm at 100° C., 24 h, with a precondition of the creep sample of 7 days 70° C., RH95%, when measured as described in “Test methods”.   
     
     
         15 . A laminate according to  claim 14 , wherein the layer made of the polyethylene composition is free from peroxides and tin.