UNGLAZED COATED PAPER

PROBLEM TO BE SOLVED: To provide unglazed coated paper that has a low white paper gloss and high printing gloss and shows sufficiently its characteristics even when the coated layer is formed with a lowered application weight. SOLUTION: As pigments, are used 5-30 wt.% of precipitated calcium carbona...

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Bibliographische Detailangaben
Hauptverfasser:	MURAKAMI YASUHARU, EMOTO HIROSHI, UCHIMOTO IWAHIRO
Format:	Patent
Sprache:	eng
Schlagworte:	ADHESIVES CHEMICAL PAINT OR INK REMOVERS CHEMISTRY COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS CORRECTING FLUIDS DYES FILLING PASTES IMPREGNATING OR COATING OF PAPER INKS METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS PAINTS PAPER NOT OTHERWISE PROVIDED FOR PAPER-MAKING PASTES OR SOLIDS FOR COLOURING OR PRINTING POLISHES PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D PRODUCTION OF CELLULOSE PULP COMPOSITIONS TEXTILES TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G USE OF MATERIALS THEREFOR WOODSTAINS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide unglazed coated paper that has a low white paper gloss and high printing gloss and shows sufficiently its characteristics even when the coated layer is formed with a lowered application weight. SOLUTION: As pigments, are used 5-30 wt.% of precipitated calcium carbonate light having fusiform, or cubic crystals, 5-30 wt.% of precipitated calcium carbonate heavy, and 40-90 wt.% of delaminated kaolin to form coating layers on the paper thereby giving the unglazed coated paper of 15-45% of white paper gloss and >=45% printing glass. The delaminated kaolin has an average particle size of 0.5-1.5 μ, contains >=80 wt.% of =20. The precipitated calcium carbonate light has 1-3 μm major axis and 0.1-0.5 μm minor axis, when the crystals are fusiform, while has the average particle size of 0.1-0.5 μm, when they are cubic.