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Polysaccharide-Based Pigments And Fillers

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By: KERRY PIANOFORTE

Editor, Coatings World, Coatings World

U.S. 8,623,504 B2
Teknologian Tutkimuskeskus VTT has been granted a patent for 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, comprised of a polysaccharide derivative selected from the group of esters or ethers of starch, cellulose, dextrin or a hemicellulose, wherein the substituent is selected from aromatic radicals having 6 to 18 carbon atoms, alicyclic groups having 6 to 12 carbon atoms and at least two conjugated unsaturated bonds, and linear or branched aliphatic hydrocarbyls having at least two conjugated unsaturated bonds, and mixtures of two or more, and wherein the polysaccharide is comprised, in addition to a first substituent comprised of the substituent with conjugated unsaturated bonds, a second substituent bonded by ester or ether bonds to the polysaccharide, wherein the second substituent is comprised of  a hydrocarbyl radical derived from a C2-20 aliphatic group.

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