METHOD FOR PRODUCING ANTICORROSIVE PIGMENT Russian patent published in 2012 - IPC C09D5/08 C07F9/40 

FIELD: chemistry.

SUBSTANCE: the invention relates to preventing metal corrosion with the use of paint coatings. The invention aims to find high-effective low-hydrolising phosphonate pigments. The result is achieved by the method of producing core anticorrosive pigment by interreacting hydroxyethylidene diphosphonic acid with calcium carbonate in a water medium. The mass ratio of hydroxyethylidene diphosphonic acid to calcium carbonate is 0,5-7,0 : 93,0 - 99,5 respectively. The mass ratio of the said mixture to water is 2 : 1 respectively. The method allows to obtain core phosphonate pigment with the structure comprising a low-hydrolising core and a hydrolising phosphonate shell which provides the effective anticorrosive properties of the pigment.

EFFECT: production of pigment with better anticorrosive properties than calcium hydroxyethylidene diphosphophonate and toxic zinc tetraoxychromate.

2 tbl, 6 ex