Segmented protective display film
A technology of display film and protective layer, which is applied in the field of segmented protective display film, and can solve problems such as inability to provide impact resistance
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Embodiment 1-5
[0140]Samples of shape memory polyurethane were prepared in a roll-to-roll process, where the isocyanate was mixed with the polyol with catalyst using an inline dynamic mixer. Apply the solution to the moving web between two silicone release liners at an appropriate flow rate to achieve the desired final sample thickness. The polyurethane between the films was heated at 70°C and wound into rolls. The films were post baked at 70°C for 24 hours before lamination to glass. The samples had a range of NCO equivalents reacted with 1.0 equivalent of -OH, as shown in Table 2, in order to obtain the desired glass transition temperature and crosslinking concentration. Table 2 shows the relative mass ratios of K-FLEX188 and Desmodur N3300 for samples 1-5. The coated material contained about 350 ppm dibutyltin dilaurate catalyst.
[0141] Table 2: Coating Compositions and Theoretical Crosslinking Concentrations
[0142]
Embodiment 6-9
[0144] Similar to samples 1-5, but these polyurethane coatings were made with a mixture of isocyanates. For these examples, the polyurethane consisted of an aliphatic polyol (K-FLEX 188) reacted with a blend of multifunctional isocyanates (Desmodur N3300 and Desmodur N3400), prepared in the same manner as samples 1-5. The weight ratios of K-FLEX to Desmodur N3300 to Desmodur N3400 for samples 6-9 are shown in Table 3.
[0145] Table 3: Mixing ratios of polyurethanes used in Examples 6-9
[0146]
[0147] 1 Note that the N3400 isocyanate contains uretdione units that can react with excess OH in the polyol component at elevated temperatures to form allophanate groups. Therefore, the table contains two stoichiometric ratios. The first is to calculate the NCO / OH ratio based only on the existing NCO content in N3300 and N3400 at the beginning of the reaction. The NCO+UD / OH ratio is the ratio after reaction of the uretdione with the excess OH of the polyol.
Embodiment 10
[0149] Similar to samples 1-5, but this polyurethane coating was made with an alternative polyol, Fomrez 55-112, in order to achieve an even lower glass transition temperature. The polyurethane consisted of an aliphatic polyol (Fomrez 55-112) reacted with a polyfunctional isocyanate (Desmodur N3300), prepared in the same manner as samples 1-5. The weight ratio of Fomrez 55-112 to Desmodur N3300 for sample 10 is shown in Table 4. The oven was operated at 70°C and the samples were post-cured at 70°C for 24 hours.
[0150] Table 4: Coating Compositions and Theoretical Crosslinking Concentrations
[0151]
[0152] Polyurethane Layer Characterization
[0153] glass transition temperature
[0154] The glass transition temperature of polyurethane coatings was characterized using a Q800DMA from TA Instruments. The samples were cut into strips 6.35 mm wide and approximately 4 cm long. Measure the thickness of each membrane. The membrane was mounted in a Q800DMA tensile f...
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