| 摘要 |
PURPOSE: A polypropylene sheet is provided which shows no color in a place where no sunlight exists but specific colors in a place where sunlight exists by a photosensitive coloring dye so that it greatly improves users' satisfaction with products. CONSTITUTION: In the extrusion form method of transparent or semi-transparent polypropylene sheet, it is followed by the next steps of: (a) diluting photosensitive coloring materials in a solvent such as toluene and mixing the diluted materials with polypropylene resin particles; (b) heating to adsorb the photosensitive coloring materials into polypropylene particles and drying; and (c) mixing the product with a particle-typed composition for general polypropylene sheet use.
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