INKS FOR THERMAL JET PRINTER AND INK CARTRIDGE Russian patent published in 2009 - IPC B41J2/215 C09D11/00 

FIELD: polygraphy.

SUBSTANCE: ink cartridge comprises printing head for thermal jet printing. The said printing head incorporates element to generate heat for ejecting ink out through appropriate orifice. Aforesaid element has protective layer on its surface in contact with inks, that comprises at least one layer selected from the group consisting of silicon oxide, silicon nitride and silicon carbide. Note that inks contain a substance that dissolves the protective layer and compound described by formula (R₂)_nA-…-N(R₁)C(O)R₃(R₄)-(A), where A represents alkylen or alkenylen that forms a ring with nitrogen atom. It contains also carbonyl group and R₃, R₁ and R₄, representing hydrogen atom, hydroxyl, alkyl, alkenylen, acyl, carbamoyl, carboxyl or sulphonyl. R₂ stands for a group related with arbitrary carbon atom A, and represents hydrogen atom, hydroxyl, alkyl, alkenylen, acyl, carbamoyl, carboxyl or sulphonyl. n varies from 0 to 4, while R₃ stands for carbon or nitrogen atom. Content of X (% wt.) of the compound satisfies the ratio 1≤X≤30.

EFFECT: prevention deterioration of images, stability of printing.

8 cl, 9 dwg, 9 tbl