Photovoltaic modules with a thermoplastic hot-melt adhesive layer and a process for their production
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Abstract
The invention relates to photovoltaic modules with a specific thermoplastic adhesive layer and the production thereof.
191 Citations
28 Claims
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1-9. -9. (canceled)
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10. Process for the production of the photovoltaic modules comprising:
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A) at least one outer covering layer on the front side, facing the energy source, of glass or an impact-resistant, UV-stable, weathering stable, transparent plastic with a low permeability to water vapor, B) at least one outer layer on the reverse side, facing away from the energy source, of glass or a weathering-stable plastic with a low permeability to water vapor, and C) at least one adhesive layer of plastic between A) and B) in which at least one or more solar cells connected electrically to one another are embedded, wherein the adhesive layer of plastic C) comprises an aliphatic, thermoplastic polyurethane with a hardness of 75 Shore A to 70 Shore D, and with a softening temperature Tsof of 90°
C. to 150°
C. at an E′
-modulus of 2 MPa (measured according to the DMS-method), which is a reaction product of an aliphatic diisocyanate, at least one Zerewitinoff-active polyol with on average at least 1.8 to not more than 3.0 Zerewitinoff-active hydrogen atoms and with a number-average molecular weight of 600 to 10,000 g/mol and at least one Zerewitinoff-active polyol with an average at least 1.8 to not more than 3.0 Zerewitinoff-active hydrogen atoms and with a number-average molecular weight of 60 to 500 g/mol as a chain lengthener, the molar ratio of the NCO groups of the aliphatic diisocyanate to the OH groups of the chain lengthener and the polyol being 0.85 to 1.2,wherein said process comprises the step of producing the photovoltaic module in a vacuum sheet laminator or in a roller laminator. - View Dependent Claims (11, 21, 22, 23, 24, 25, 26, 27, 28)
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12. Photovoltaic modules comprising:
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A) at least one outer covering layer on the front side, facing the energy source, of an impact-resistant, UV-stable, weathering-stable, transparent plastic which is capable of acting as a barrier to water vapor, B) at least one outer layer on the reverse side, facing away from the energy source, of glass or a weathering-stable plastic which is capable of acting as a barrier to water vapor, and C) at least one adhesive layer of plastic between A) and B) in which at least one or more solar cells connected electrically to one another are embedded, wherein the adhesive layer of plastic C) comprises an aliphatic, thermoplastic polyurethane with a hardness of 75 Shore A to 70 Shore D, and with a softening temperature Ts of 90°
C. to 150°
C. at an E′
-modulus of 2 MPa, which is a reaction product of an aliphatic diisocyanate, at least one Zerewitinoff-active polyol with on average at least 1.8 to not more than 3.0 Zerewitinoff-active hydrogen atoms and with a number-average molecular weight of 600 to 10,000 g/mol and at least one Zerewitinoff-active polyol with an on average at least 1.8 to not more than 3.0 Zerewitinoff-active hydrogen atoms and with a number-average molecular weight of 60 to 500 g/mol as a chain lengthener, the molar ratio of the NCO groups of the aliphatic diisocyanate to the OH groups of the chain lengthener and the polyol being 0.85 to 1.2. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20)
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Specification