Teknologian Tutkimuskeskus Vtt Oy

Teknologian Tutkimuskeskus Vtt

Upm-kymmene Corporation

Valtion Teknillinen Tutkimuskeskus

Soili Peltonen

Mika Sievi-korte

Jani Vuorenpaa

Pertti Tormala

Harri Happonen

Sami Turunen

Mauno Miettinen

Hannu Mikkonen

Vesa Kunnari

Pia Qvintus-Leino

Eino Sivonen

Kyösti Valta

Kirsi Kataja

Leila Pohjola

Tarja Sinkko

Arto Maaninen

Sari Hyvärinen

Kimmo Koivunen

Tero Malm

Petri Varjos

Nina Pykäläinen

Kaisa Putkisto

Mika Sievi-Korte

Aki Laine

Juha Sarlin

Anne Kallioinen

Anna Suurnäkki

Saija Luukkainen

Allan Johansson

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&#xb0; 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.

Diffractive microstructure and a method of producing the same

Particles of a polysaccharide derivative, having at least one substituent with conjugated unsaturated bonds and exhibiting an index of refraction in excess of 1.50 and a method for the production thereof. In the method, the raw-material is suspended in an organic solvent to form a suspension, which is contacted with an organic reactant comprising a residue with conjugated unsaturated bonds; the raw-material and the organic reactant are reacted to form a derivative exhibiting ester or ether bond between the raw-material and the residue with conjugated unsaturated bonds; the polysaccharide derivative is dissolved in a solvent to form a solution; and the solution is contacted with a non-solvent to precipitate particles of the polysaccharide derivative. The invention provides lightweight, optically improved organic pigments and fillers based on renewable resources and which are recyclable by combustion or composting.

Polysaccharide-based pigments and fillers

Growing community of inventors

Vtt, Finland

Soili Peltonen