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US 2014/0349048 A1Published application
Multilayer composite films and articles prepared therefrom
AssigneeE. I. Du Pont de Nemours and Company
InventorsGeraldine M. LENGES, Diego BOERI
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Abstract
The present invention is an optically transparent laminate film comprising: at least three layers of film, wherein at least two of the at least three layers comprise ionomeric films, and wherein the film can be suitable for use in a photovoltaic cell or in packaging.
Claims21
A laminate article comprising:
- (i) a first outer layer comprising a first ionomer;
- (ii) a core layer comprising at least one polymer layer and positioned such that a first surface of the core layer is in direct contact with at least one surface of the first outer layer;
- (iii) a second outer layer comprising a second ionomer and positioned such that a second surface of the core layer is in direct contact with at least one surface of the second outer layer;
- wherein the at least one core layer polymer is a non-ionomeric polymer and
- wherein the individual optical transmittance for each of the first ionomer layer, the second ionomer layer, the core layer unit, and the laminate at the same wavelength can each be measured, and wherein the measured transmittance for the laminate is greater than the expectation value of the transmittance calculated from the transmittance of the three individual layers in their non-laminated state weighted by their thicknesses in the laminate;
- or
- wherein the laminate article, the first ionomer and the second ionomer and the core layer polymer are characterized by a transition temperature measured under tensile conditions at 1 Hz by DMA such that the value of the transition temperature for the laminate article is greater than the value of the transition temperature of the core layer polymer measured under identical conditions in a non-laminated state.
4 more elements
An optically transparent laminate film comprising:
- at least three layers of film, wherein (a) at least two of the at least three layers of film comprise an ionomeric film (b) at least one of the at least three layers of film independently in a non-laminated state (i) transmits less than about 85% incident visible light or (ii) has a haze value of equal to or greater than about 6% as measured according to ASTM D1003-00 on the at least one layer having a thickness of about 40 mil or less and (c) the transparent laminate (i) transmits at least about 85% of incident visible light or (ii) has a haze value of equal to or less than about 6% as measured according to ASTM D1003-00.
17-29. (canceled)
Dependencies are inferred from the claim text.