Light-emittnig diode mark and its used semi-transparent plastic sheet
A light-emitting diode, translucent technology, applied in the field of LED signs, can solve problems such as deviation and excessive slack of the gauge sheet
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preparation example Construction
[0053] The particle layer can be prepared by melt-mixing the particles in an amount of 1-60%, preferably 10-50%, with a thermoplastic matrix.
[0054] Melt mixing is well known in the industry, and one example of a method of making an article of the invention is as follows: After drying the thermoplastic matrix resin in a dehydrating, forced-air oven, it is passed through, for example, a Single-screw extruder and cross-linked granulate compounding. Compounding can also be carried out using a twin-screw extruder equipped with a vacuum degassing system. Pellets, matrix resin and additives are fed into the feed hopper of the extruder through separate feeders. The particle conveying system should be a closed system to avoid safety hazards and dust hazards. The pellets are metered into the feed hopper of the extruder using a feeder with a twisted screw by gravimetric control or volumetric control. When the composition contains 1-60% dispersed particles and 40-99% thermoplastic m...
Embodiment 1
[0092] flakes with two layers
[0093] Preparation of granular layer (composition x)
[0094] Cross-linked particles containing 96% methyl methacrylate / 4% ethyl acrylate copolymer and allyl methacrylate as a cross-linking agent were melt mixed at 40% by weight in a molded acrylic resin (methacrylic acid In methyl ester / ethyl acrylate=96 / 4), described particle is spherical substantially, and average particle diameter is about 10-32 micron, and wherein its diameter of 90% by weight particle is less than 40 micron, and refractive index (n D ) is 1.4907. The refractive index (n D ) is 1.4935, measured according to ASTM D 542. Therefore, the refractive index of the particles differs by 0.002 units compared to the acrylic matrix.
[0095] Preparation of granular layer (composition y)
[0096] Crosslinked particles containing 74.3% methyl methacrylate, 24.8% styrene, and 0.9% allyl methacrylate as a crosslinking agent were melt mixed at 40% by weight in a molded acrylic resi...
Embodiment 2
[0120] Sheet products with multiple layers
[0121] The following are examples of materials fabricated using the three-layer coextrusion technique. Two extruders were used (A = primary extruder, B = secondary extruder). The resin extruded from the primary extruder was used as the A layer, and the resin extruded from the secondary extruder was used as the B layer. Flake samples were fabricated with an "ABA" layer structure. In Example 3a, a reference sheet for these experiments was made by feeding a standard red acrylate resin through these two extruders.
[0122] Tables V-A show that the standard red acrylate sample (Example 3a) and the coextruded red samples (Examples 3b-f) have approximately the same light transmittance and transmitted color values. Table V-B shows that the upper surface of the coextruded samples had about the same gloss and reflective color values as the upper surface of the standard acrylate sample.
[0123] Examples 3a-f contained pigment in the b...
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Abstract
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