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US 9,039,822 B2Granted
Ceramic inks for inkjet printers
AssigneeLamberti SPA
InventorsDario Fornara, Alan Nappa, Tamara Verzotti, Paolo Prampolini, Stefano Crespi, Giovanni Floridi, Giuseppe Li Bassi
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Abstract
Ceramic inkjet inks comprising ceramic inorganic pigments having average particle size between 0.1 and 0.8 μm, an organic medium and a dispersant, the dispersant being the reaction product of a polyethyleneimine with a homo- or co-polyester based on lactic acid, and method for decorating green or fired ceramic bodies by the use of the above ceramic inkjet inks.
Claims20
A ceramic inkjet ink comprising:
- a ceramic inorganic pigment having an average particle size of from about 0.1 to about 0.8 μm,
- an organic medium and
- a dispersant which is the reaction product of a polyethyleneimine and a homo- or co-polyester of formula (1)
- R—[(—O-A-CO)n-(-O—(CH)CH3-CO)m-]-OH (1)
- wherein:
- R is hydrogen or a polymerization terminating group;
- A is a linear or branched alkylene radical deriving from a hydroxycarboxylic acid having from about 2 to about 20 carbon atoms or a lactone thereof;
- and
- n and m are integers.
6 more elements
A method for decorating green or fired ceramic bodies by inkjet printing comprising:
- milling a ceramic inorganic pigment having average particle size of from about 1.0 to about 10 μm in an organic medium in the presence of a dispersant which is a reaction product of a polyethyleneimine and a homo- or co-polyester of formula (1),
- R—[(—O-A-CO)n-(-O—(CH)CH3-CO)m-]-OH (1)
- wherein:
- R is hydrogen or a polymerization terminating group;
- A is a linear or branched alkylene radical deriving from a hydroxycarboxylic acid having from about 2 and about 20 carbon atoms or a lactone thereof;
- and
- n and m are integers
- until the average particle size of the pigment is between 0.1 and 0.8 μm to produce a ceramic inkjet ink;
- spreading a glaze on the surface of a green or fired ceramic body;
- inkjet printing a decoration onto the green or fired ceramic body by using the ceramic inkjet ink:
- and
- firing the green or fired ceramic body at a temperature of from about 900 to about 1250° C. for from about 15 to about 240 minutes.
9 more elements
Dependencies are inferred from the claim text.