Toner for developing electrostatic image

G - Physics – 03 – G

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Details

G03G 9/087 (2006.01) G03G 9/08 (2006.01) G03G 9/097 (2006.01)

Patent

CA 2139186

A toner for developing an electrostatic image is constituted by a binder resin and a colorant. The toner is characterized by a percentage change G' of at most 50 % as calculated by the following formula (1) : .gamma.G' = (1 - G' 50%/G'1%) x 100 ...(1), wherein .gamma.G. denotes a percentage change of storage modulus, G'50% denotes a storage modulus at 50 % strain at 150 °C, and G'1% denotes a storage modulus at 1 % strain at 150 °C; a percentage change .gamma.G" of at most 50 % as calculated by the following formula (2): .gamma.G" = (1 - G"50%/G"1%) x 100 ...(2), wherein .gamma.G" denotes a percentage change of loss modulus, G"50% denotes a loss modulus at 50 % strain, and G"1% denotes a loss modulus at 1 % strain; and a storage modulus G' of 3x10 3 - 7x10 4 dyn/cm2 in a range of 1 - 50 % strain at 150 °C. The toner is characterized by applicability to a wide variety of image forming apparatus, especially those having remarkably different fixing speeds.

Un toner pour produire une image électrostatique est constitué d'une résine liante et d'un colorant. Le toner est caractérisé par un pourcentage de variation G' d'au plus 50 % d'après la formule suivante (1) : gammaG' = (1 - G' 50 %/G'1 %) x 100 ...(1), où gammaG correspond au pourcentage de variation du module de conservation, G'50 % correspond au module de conservation à une force de 50 % à 150 degrés C, et G'1 % correspond au module de conservation à une force de 1 % à 150 degrés C; un pourcentage de variation gammaG" d'au plus 50 % d'après la formule suivante (2) : gammaG" = (1 - G"50 %/G"1 %) x 100 ...(2), où gammaG" correspond au pourcentage de variation du module de perte, G"50 % correspond au module de perte à une force de 50 % et G"1 % correspond au module de perte à une force de 1 %; et un module de conservation G' de 3x10 3 - 7x10 4 dyn/cm2 dans une plage de force variant de 1 - 50 % à 150 degrés C. Le toner est caractérisé par son applicabilité à une grande variété d'appareils produisant des images, surtout ceux qui ont des temps de fixation remarquablement différents.

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