The present invention relates to a first composition (A) comprising (i) is triallyl isocyanurate and triallyl cyanurate. Besides, the present invention, the first composition (A) and at least one polyolefin copolymer also relates to a second composition (B) comprising. Finally, the present invention relates to the use of the composition (B) for producing a film for encapsulating an electronic device, in particular a solar cell.
In a further preferred embodiment of the present invention, thecomposition (B) also comprises at least one further compound selected from the group consisting of crosslinking agents, silane coupling agents, antioxidants, aging inhibitors, metal oxides, metal hydroxides, white pigments; being used as the further compound particularly preferred silane coupling agent.
The proportion of the composition (B) comprised crosslinking agent is not particularly limited. The proportion of crosslinker in the composition (B) is, in particular, from 0.005 to 5 wt .-%, preferably 0.01 to 3 wt .-%, more preferably 0.05 to 3 wt .-%, more preferably 0.1 to 1.5 wt .-%, in each based on the mass of all of the composition (B) comprised polyolefin.
As according to the invention can be used in the composition (B) silane coupling agent are all silanes into consideration which have an unsaturated hydrocarbon group and a hydrolyzable group (described, for example in EP 2436701 B1 . US 5,266,627 ).
The proportion of the composition (B) included silane coupling agent is not particularly limited. The proportion of all of the composition (B)included silane coupling agent is in particular from 0.05 to 5 wt .-%, preferably 0.1 to 2 wt .-%, each based on the mass of all of the composition (B) comprised polyolefin.
The proportion of the composition (B) included antioxidants is not particularly limited. The proportion of all of the composition (B) comprised antioxidants is in particular from 0.01 to 0.5 wt .-%, preferably 0.05 to 0.3 wt .-%, each based on the mass of all of the composition (B) comprised polyolefin.
The proportion of the composition (B) comprised HALS-stabilizers is not particularly limited. The proportion of all of the composition (B) comprised HALS stabilizers is in particular from 0.01 to 0.5 wt .-%, preferably 0.05 to 0.3 wt .-%, each based on the mass of all of the composition (B)comprised polyolefin.
The proportion of the composition (B) included UV absorber is not particularly limited. The proportion of all of the composition (B) included UV absorber is in particular from 0.01 to 0.5 wt .-%, preferably 0.05 to 0.3 wt .-%, each based on the mass of all of the composition (B) comprised polyolefin.
The proportion of the composition (B) included metal oxides is not particularly limited. The proportion of all of the composition (B) included metal oxides is in particular at 0.01 to 10 wt .-%, preferably 0.05 to 3 wt .-%, each based on the mass of all of the composition (B) comprised polyolefin.
The proportion of the composition (B) comprised metal hydroxides is not particularly limited. The proportion of all of the composition (B) comprised metal hydroxides is in particular from 0.01 to 10 wt .-%, preferably 0.05 to 3 wt .-%, each based on the mass of all of the composition (B) comprised polyolefin.
The proportion of the composition (B) comprised of white pigments is not particularly limited. The proportion of all of the composition (B) white pigment is in particular from 5 to 25 wt .-%, preferably 10 to 20 wt .-%, more preferably 15 wt .-%, each based on the mass of all (by the composition B ) included polyolefin copolymers.
The polymer composition (B) is used in a further aspect of the present invention for producing a film for encapsulating an electronic device, in particular a solar cell.
The composition (B) by first mixing the composition (A) and the respective additives and the polyolefin copolymer is prepared. This is done in particular by adding the additives in liquid form, ie, pure or as a solution in a solvent, to the composition (B) in a mixer. Thereafter, the mixture is stirred or the mixture is kept moving until the liquid has been completely absorbed by the polymer granules. Solvent, if used, are then removed by applying a vacuum.
In a second step, the polymer formulation is extruded through an extruder into a film. Here, the composition (B) is continuously metered via a metering into an extruder in which melting the polymer and the additives are dispersed by kneading the mixture homogeneously in the polymer matrix. At the end of the extruder, the melt is forced through a slot die.After the die, the film is peeled off, after-cooled, and wound up by a roll mill.