UNDERGLAZE BLUE DYE Russian patent published in 2000 - IPC

FIELD: dyes. SUBSTANCE: invention relates to dyes used for decoration of porcelain and other ceramic articles. Dye has the following components, wt. -%: cobalt oxide 47.0-53.0; quartz sand 22.0-31.0; kaolin 13.0-17.8; pegmatite 5.0-6.4; porcelain grog 0.7-0.8; dolomite 1.3-1.9 and the following additional components, %: dextrin solution 12-14; casein glue 1.33-2.67 and technical glycerol 0.67-1.33. Dye has the following composition, wt.-%: Co₃O₄ 47.0-53.0; SiO₂ 35.1- -43.1; Al₂O₃ 6.5-8.8; CaO 1.1-1.5; MgO 0.5-0.7; K₂O 0.5-0.7; Na₂O 0.3-0.4; TiO₂ 0.1-0.2; Fe₂O₃ 0.2-0.3 and porcelain grog has the following chemical composition, wt.-%: SiO₂ 67.0-70.0; Al₂O₃ 23.0-25.3; CaO 0.95-1.05; MgO 0.4-0.6; K₂O 2.5-2.9; Na₂O 1.1-1.5; TiO₂ 0.4-0.6 and Fe₂O₃ 0.6-0.8. Dye shows necessary properties for pictorial art - purity of decor blue tone, surface purity that correspond to standard requirements. EFFECT: improved quality, enhanced grade of quality. 4 cl, 3 tbl