A composition, multilayer sheets made therefrom, and methods for making and using the same
A technology of multi-layer sheets and compositions, applied in the direction of chemical instruments and methods, other household appliances, synthetic resin layered products, etc., capable of solving problems such as insufficient impact resistance
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Embodiment 1
[0108] Table 1 shows the figure 2 or image 3 Compositions of the second cover layer 22 (eg, a film layer directly adhered to the EVA encapsulant) and their peel strength values from the EVA encapsulant sheet. The first film comprised a BPA-based polycarbonate homopolymer and showed a peel strength value of 4.5 N / mm. The second film comprised a polymer blend prepared from 40 wt% DMBPC carbonate homopolymer and 60 wt% BPA carbonate homopolymer and showed a peel strength of 4.0 N / mm. Finally, a film comprising an EVA copolymer with a vinyl acetate (VA) content of 6.5 wt.% showed a peel strength of 4.0 N / mm.
[0109]
[0110] Table 1 shows that film layers made from blends of DMBPC carbonate and BPA carbonate have as good peel strength for EVA encapsulants as BPA carbonate film layers or film layers based on EVA with a vinyl acetate content of 6.5%. .
Embodiment 2
[0112]In this embodiment, several different combinations of materials were used to make a single layer sheet to determine the best combination of materials for the core layer. A film extrusion process with a calender nip setup was used. The initial tensile strength and elongation at break, multiaxial impact (MAI), WVTR, and heat shrinkage properties of Samples 1 to 5 and Comparative Samples 1 to 4 (C1 to C4) were determined. The sheets for samples 1 to 3 and C1 to C3 were 0.18 mm thick, while samples 4 and 5 were 0.25 mm thick, and C4 was 0.125 mm thick. Table 2 lists the materials used to prepare the sheets tested in this example. Weight average molecular weight (Mw) was determined by gel permeation chromatography (GPC) method using standard polycarbonate samples of known molecular weight. The homopolymer of DMBPC carbonate refers to the DMBPC polycarbonate repeating unit shown in formula (7) present in 100 mol%. Table 3 shows the sheet compositions and tested physical pro...
Embodiment 3
[0120] In this embodiment, a co-extrusion process with a multi-manifold die and calender nip set-up was used to make multilayer sheets with several different formulations and with a core layer and a weather-resistant protective cover layer. The formulations and thicknesses of the core layer and weather protection layer for each multilayer sample are listed in Table 5. Multilayer sheets were tested for initial tensile strength, MAI, WVTR, heat shrinkage, and optimized properties (color and transmission). Additionally, the sheets were tested for MAI and WVTR performance after PCT treatment. The results are summarized in Table 6, where TS refers to tensile strength and TE refers to tensile elongation. The multilayer sheets were also tested for color change and light transmission (if the sample was clear) after 2,000 hours of UV exposure on the weatherproof cover side. The results are summarized in Table 7.
[0121] Sample 6 is a 0.35 mm thick opaque bilayer sheet prepared by t...
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Abstract
Description
Claims
Application Information
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