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US 4,066,462 AGranted
Anti-corrosive organic pigment
AssigneeDainichiseika Color & Chemicals Mfg. Co., Ltd.
InventorsShojiro Horiguchi, Michiei Nakamura, Yoshifumi Sugito
Life of this patent
Estimating the term…
Abstract
An anti-corrosive organic pigment is prepared by mixing a lignin type compound with urea, a urea derivative, melamine, a melamine derivative, ammonia or an ammonium salt, condensing the components of the mixture by heating the mixture in a molten form, and then pulverizing or dispersing the reaction mixture to form a pigment.
Claims15
An anti-corrosive organic pigment prepared by a process, comprising:
- mixing 1 part by wt of a lignin compound with from 0.5 to 5 parts by wt. of at least one nitrogen containing compound selected from the group consisting of urea, biuret, guanidine, biguanide, dicyandiamide, melamine, ammeline ammelide, melame, ammonium carbamate, cyanates, isocyanates, methylenediurea, ammonia, ammonium carbonate, and ammonium formate;
- condensing said compounds by heating the mixture to the molten state, and
- preparing said pigment by pulverizing, grinding or dispersing said condensed product.
An anti-corrosive paint composition, which comprises:
- a mixture of an anti-corrosive organic pigment prepared by mixing and condensing a reactant mixture of 1 part by wt. of a lignin compound and from 0.5 to 5 parts by wt. of a nitrogen containing compound selected from the group consisting of urea, biuret, guanidine, biguanide, dicyandiamide, melamine, ammeline, ammelide, melame, ammonium carbamate, cyanates, isocyanates, methylenediurea, ammonia, ammonium carbonate, ammonium formate, and a paint vehicle.
Dependencies are inferred from the claim text.