Diffractive microstructure and a method of producing the same
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United States of America Patent
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Aug 18, 2020
Grant Date -
Dec 30, 2010
app pub date -
Dec 17, 2008
filing date -
Dec 21, 2007
priority date (Note) -
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Abstract
Diffractive microstructure comprising micro-protrusions or microgrooves or a combination thereof and method of producing the same. The microstructure is formed in a layer of a thermoplastic carbohydrate polymer or a polymer derived from a carbohydrate material, said polymer having a glass transition point of less than 210° C. The thermoplastic polymer is preferably selected from the group of native starch, dextrin, native hemicellulose, native cellulose, poly(lactic acid), polylactides, polycaprolactone, starch derivatives, dextrin derivatives, hemicellulose derivatives, cellulose derivatives, and mixtures thereof. The invention provides an inexpensive and reliable way of incorporating into the products safety markings, which allow for visual inspection or detection, such as holograms and barcodes.
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International Classification(s)
- B41M:PRINTING, DUPLICATING, MARKING, OR COPYING PROCESS....
- B29C:SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTAN....
- B28B:SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS, SLAG O....
- B29D:PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FRO....
- G02B:OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
- B44F:SPECIAL DESIGNS OR PICTURES
- B32B:LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA....
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