초록 ▼

An inorganic black pigment is made by calcining raw materials such as manganese dioxide, manganese carbonate, strontium carbonate or calcium carbonate. The product is a perovskite structure made up of (a) 25-84 mol % of a manganese oxide and (b) 75-16 mol % SrO and/or CaO plus residual carbonates an

An inorganic black pigment is made by calcining raw materials such as manganese dioxide, manganese carbonate, strontium carbonate or calcium carbonate. The product is a perovskite structure made up of (a) 25-84 mol % of a manganese oxide and (b) 75-16 mol % SrO and/or CaO plus residual carbonates and mineralizers. The thus-produced black pigment is particularly advantageous in that it contains no heavy metals or highly toxic material and that it has very low oil absorption and high tinting strength.

대표청구항 ▼

An inorganic black pigment having a distorted perovskite structure in which the net oxide composition after calcination at a temperature between 1200°and 1900°F. consists essentially of (a) 25 to 84 mol % of an oxide of manganese and (b) 75 to 16 mol % strontium oxide and/or calcium oxide, together

An inorganic black pigment having a distorted perovskite structure in which the net oxide composition after calcination at a temperature between 1200°and 1900°F. consists essentially of (a) 25 to 84 mol % of an oxide of manganese and (b) 75 to 16 mol % strontium oxide and/or calcium oxide, together with residual amounts of carbonates and/or mineralizers.