Patent ID: 8936893
Filing Date: 2015-01-20
Classification: G03G,Y10T

Abstract:
1. A fluorescing yellow polymeric toner particle comprising a polymeric binder phase, and having distributed therein: one or more non-fluorescing yellow colorants having one or more absorbance peak wavelengths of at least 480 nm and up to and including 600 nm, and one or more fluorescing yellow colorants having one or more emission peak wavelengths of at least 480 nm and up to and including 600 nm, wherein: the molar ratio of the one or more fluorescing yellow colorants to the one or more non-fluorescing yellow colorants is such that the covering power of the fluorescing yellow polymeric toner particle is greater than the covering power of non-fluorescing yellow polymeric toner particles having the same composition and size except that the one or more fluorescing yellow colorants are absent, the molar ratio of the one or more fluorescing yellow colorants to the one or more non-fluorescing yellow colorants is such that the L* value of the one or more non-fluorescing yellow colorants, when present in a non-fluorescing yellow polymeric toner particle comprising the same polymeric binder phase, is increased by at least 50% in the presence of the one or more fluorescing yellow colorants in the non-fluorescing yellow polymeric toner particle the molar ratio of the one or more fluorescing yellow colorants to one or more non-fluorescing yellow colorants is at least 2:1 and up to 8:1, and the one or more non-fluorescing yellow colorants are selected from group consisting of coumarins, naphthalimides, perylenes, and anthrones.