Phase change ink compositions

C - Chemistry – Metallurgy – 09 – D

Patent

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C09D 11/00 (2006.01) C09D 139/04 (2006.01)

Patent

CA 2400930

Disclosed is a phase change ink composition comprising a colorant and an ink vehicle, the ink being a solid at temperatures less than about 50°C and exhibiting a viscosity of no more than about 20 centipoise at a jetting temperature of no more than about 160°C, wherein at a first temperature hydrogen bonds of sufficient strength exist between the ink vehicle molecules so that the ink vehicle forms hydrogen-bonded dimers, oligomers, or polymers, and wherein at a second temperature which is higher than the first temperature the hydrogen bonds between the ink vehicle molecules are sufficiently broken that fewer hydrogen-bonded dimers, oligomers, or polymers are present in the ink at the second temperature than are present in the ink at the first temperature, so that the viscosity of the ink at the second temperature is lower than the viscosity of the ink at the first temperature.

Il est divulgué le changement d'état d'une encre composée d'un colorant et d'un véhicule de l'encre, l'encre étant solide à des températures inférieures à 50.degrés.C et présentant une viscosité d'environ 20 centipoises tout au plus à une température de projection n'excédant pas 160.degrés. C. € une première température, des liaisons d'hydrogène suffisamment fortes sont présentes entre les molécules du véhicule de l'encre de façon que celui-ci forme des dimères, des oligomères et des polymères. € une seconde température, plus élevée que la première, les liaisons d'hydrogène entre les molécules du véhicule de l'encre sont suffisamment brisées pour que l'encre contienne moins de dimères, d'oligomères et de polymères qu'elle n'en contient à la première température, si bien que sa viscosité est moins dense.

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