Solar panels with adhesive layers
The present application is directed to a film they may be used as an adhesive for solar panels. For example, the present application is directed to a composition, for example an adhesive composition, comprising a low crystalline poly-alpha-olefin resin having and an alkoxysilane functional poly-alpha-olefin having a tensile strength of less than 500 MPa. The composition has a melt flow index of less than 30. The application is also directed to a panel comprising a front panel comprising a transparent barrier, a back panel and a photovoltaic material layer between the front panel and the back panel. An adhesive layer is between the front panel and the back panel, wherein the adhesive layer adheres the front panel to the back panel, and the adhesive layer comprises a low crystalline poly-alpha-olefin elastomer blended with an alkoxysilane functional polyolefin.
1. A composition comprising:
a low crystalline poly-alpha-olefin resin; and
an alkoxysilane functional poly-alpha-olefin having a tensile strength of less than 500 MPa,
wherein the composition has a melt flow index of less than 30 g/10 min @ 190° C./2.16 kg; and
wherein the low crystalline poly-alpha-olefin resin has a WVTR of greater than 5 g/m 2 /day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
2. The composition of claim 1 wherein the melt flow index is less than 20 g/10 min @ 190° C./2.16 kg.
3. The composition of claim 1 wherein the melt flow index is less than 15 g/10 min @ 190° C./2.16 kg.
4. The composition of claim 1 wherein the melt flow index is less than 10 g/10 min @ 190° C./2.16 kg.
5. The composition of claim 1 wherein the melt flow index is less than 7 g/10 min @ 190° C./2.16 kg.
6. The composition of claim 1 wherein the composition has a melt viscosity of greater than 500,000 cP at 150° C.
7. The composition of claim 1 comprising a catalyst.
8. The composition of claim 1 wherein the low crystalline poly-alpha-olefin is non-chlorinated.
9. The composition of claim 1 wherein the low crystalline poly-alpha-olefin has a melting point greater than 20° C.
10. The composition of claim 1 wherein the low crystalline poly-alpha-olefin has a density according to ASTM D 792 of greater than 0.85.
11. The composition of claim 1 wherein the alkoxysilane functional poly-alpha-olefin has a tensile strength of less than 100 MPa.
12. The composition of claim 1 wherein the alkoxysilane functional poly-alpha-olefin has a tensile strength of less than 10 MPa.
13. The composition of claim 1 wherein the low crystalline poly-alpha-olefin resin has a WVTR of greater than about 15 g/m 2 /day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
14. The composition of claim 1 wherein the alkoxysilane functional poly-alpha-olefin resin has a WVTR of greater than 0.1 g/m 2 /day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
15. The composition of claim 1 wherein the alkoxysilane functional poly-alpha-olefin resin has a WVTR of greater than about 5 g/m 2 /day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
16. The composition of claim 1 wherein the composition has an WVTR of greater than 3 g/m 2 /day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
17. The composition of claim 1 wherein greater than 35 weight percent of the total weight of the composition is low crystalline polyolefin resin.
18. The composition of claim 1 wherein at least 70 weight percent of the total weight of the composition is low crystalline polyolefin resin.
19. The composition of claim 1 wherein the composition comprises an additional resin.
20. The composition of claim 19 wherein the additional resin has a WVTR of greater than about 0.1 g/m 2 per day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
21. The composition of claim 19 wherein the additional resin has a WVTR of greater than about 5 g/m 2 per day at a film thickness of about 0.46 mm (18 mils) at 50° C. and 100% RH.
22. An article comprising the composition of claim 1 adhered to a second film.