| abstract |
A diffractive microstructure having a minute protrusion or a minute groove or a combination thereof and a method for manufacturing the same. The microstructure is formed in a layer of polymer derived from a thermoplastic carbohydrate polymer or carbohydrate material having a glass transition point below 210 ° C. The thermoplastic polymer is preferably selected from the group of natural starch, dextrin, natural hemicellulose, natural cellulose, poly (lactic acid), polylactide, polycaprolactone, starch derivative, dextrin derivative, hemicellulose derivative, cellulose derivative and mixtures thereof. The The present invention provides an inexpensive and reliable method of incorporating safety signs into the product that can be visually inspected or detected, such as holograms and barcodes. |