EVM in solar modules
View Patent ↗The present invention relates to a solar module containing at least one layer made up of at least one α-olefin-vinyl acetate copolymer which has a vinyl acetate content of ≧40% by weight, based on the total weight of the α-olefin-vinyl acetate copolymer, and has been prepared by a solution polymerization process at a pressure of from 100 to 700 bar, the use of the α-olefin-vinyl acetate copolymer mentioned in solar modules, the use of the solar module of the invention for stationary or mobile power generation and also a solar power plant containing at least one solar module according to the invention.
1. A solar module containing at least one layer made up of at least one α-olefin-vinyl acetate copolymer, wherein the α-olefin-vinyl acetate copolymer has a vinyl acetate content of ≧60% by weight, based on the total weight of the α-olefin-vinyl acetate copolymer, and has been prepared by a solution polymerization process at a pressure of from 100 to 700 bar.
2. The solar module according to claim 1 , wherein the α-olefin-vinyl acetate copolymer has a vinyl acetate content of ≧80% by weight, based on the total weight of the α-olefin-vinyl acetate copolymer.
3. The solar module according to claim 1 , wherein the α-olefin in the α-olefin-vinyl acetate copolymer is selected from among ethene, propene, butene, pentene, hexene, heptene and octene.
4. The solar module according to any claim 1 , wherein the α-olefin-vinyl acetate copolymer has an MFI (g/10 min) measured in accordance with ISO 1133 at 190° C. under a load of 21.1 N of from 1 to 40.
5. The solar module according to claim 1 , wherein the α-olefin-vinyl acetate copolymer has an MFI (g/10 min) measured in accordance with ISO 1133 at 190° C. under a load of 21.1 N of from 1 to 10.
6. The solar module according to claim 1 , wherein the α-olefin-vinyl acetate copolymer has an MFI (g/10 min) measured in accordance with ISO 1133 at 190° C. under a load of 21.1 N of from 2 to 6.
7. The solar module according to claim 1 , wherein the α-olefin-vinyl acetate copolymer has a Mooney viscosity ML 1+4 at 100° C. measured in accordance with DIN 53 523 of from 3 to 50 Mooney units.
8. The solar module according to claim 1 , wherein the α-olefin-vinyl acetate copolymer has a Mooney viscosity ML 1+4 at 100° C. measured in accordance with DIN 53 523 of from 4 to 35 Mooney units.
9. The solar module according to claim 1 , at wherein the number average molecular weight of the α-olefin-vinyl acetate copolymer determined by means of GPC is from 5000 g/mol to 200 000 g/mol.
10. The solar module according to claim 1 , that wherein the α-olefin-vinyl acetate copolymer is present in uncrosslinked form.
11. The solar module according to claim 1 , wherein the at least one layer made up of the at least one α-olefin-vinyl acetate copolymer contains no ageing inhibitors and/or no bonding agents.
12. The solar module according to claim 1 which is made up of
i) a glass substrate A having a front side and a rear side, with the front side being the side facing the sun in the finished solar module;
ii) a transparent polymer layer B applied to the rear side of the glass substrate;
iii) one or more solar cells C applied to the polymer layer B;
iv) a further transparent polymer layer D applied on top of the solar cells;
v) a protective layer E;
where the solar cells C are embedded in the transparent polymer layers B and D, wherein at least one of the transparent polymer layers B and/or D is/are made up of an α-olefin-vinyl acetate copolymer as defined in any of claims 1 to 5 .
13. The solar module according to claim 1 which is made up of
i) a glass substrate A having a front side and a rear side, with the front side being the side facing the sun in the finished solar module;
ii) a transparent polymer layer B applied to the rear side of the glass substrate;
iii) one or more solar cells C applied to the polymer layer B;
iv) a further transparent polymer layer D applied on top of the solar cells;
v) a protective layer E;
where the solar cells C are embedded in the transparent polymer layers B and D, wherein both transparent polymer layers B and D are made up of an α-olefin-vinyl acetate copolymer as defined in any of claims 1 to 5 .
14. The solar module according to claim 12 or 13 , wherein a connection socket and a connection terminal and a frame are additionally present.
15. The solar module according to claim 12 or 13 , that wherein a connection socket and a connection terminal and an aluminum profile frame are additionally present.
16. A solar power plant containing at least one solar module according to claim 1 .
17. A solar power plant containing at least one solar module according to claim 12 .
18. A solar power plant containing at least one solar module according to claim 13 .