Electrostatic toners with polyamine charge stabilizers
AssigneeBASF SE
InventorsJohannes P. Dix, Ulf Baus, Karin H. Beck, Friedrich-Wilhelm Raulfs
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Abstract
An electrostatic toner contains a polymeric binder and as a charge stabilizer a polyamine whose average molecular weight is from 150 to 15,000 and wherein the nitrogen atoms are separated from each other by C.sub.1 -C.sub.13 - alkylene, which may be phenyl-substituted, or by phenylene, which may be C.sub.1 -C.sub.4 -alkyl-substituted, and are substituted by C.sub.1 -C.sub.13 -alkyl, which may be phenyl-, hydroxyl- or carboxyl-substituted, phenyl, C.sub.1 -C.sub.10 -alkanoyl, benzoyl, C.sub.1 - C.sub.6 - alkylcarbamoyl, phenylcarbamoyl or a radical of the formula CO-L-CO, where L is C.sub.2 -C.sub.8 -alkylene, the last case resulting in the crosslinking of two polyamine units.
Claims11
An electrostatic toner, comprising:
- a) a polymeric binder;
- and
- b) a charge stabilizer, wherein said charge stabilizer is a polyamine having an average molecular weight of 150-15,000, said polyamine having at least three nitrogen atoms wherein adjacent nitrogen atoms are separated from each other by a first radical selected from the group consisting of C.sub.1 -C.sub.13 -alkylene and phenyl-substituted C.sub.1 -C.sub.13 -alkylene, said nitrogen atoms being substituted by a second radical selected from the group consisting of C.sub.1 -C.sub.13 -alkyl, phenyl-substituted C.sub.1 -C.sub.13 -alkyl, hydroxyl-substituted-C.sub.1 -C.sub.13 -alkyl, carboxyl-substituted C.sub.1 -C.sub.13 -alkyl, phenyl, C.sub.1 -C.sub.10 -alkanoyl, benzoyl, C.sub.1 -C.sub.6 -alkylcarbamoyl and phenylcarbamoyl, and said adjacent nitrogen atoms are bonded together by said first radical or nitrogen atoms on two of said polyamines are bonded together through a third radical of the formula CO-L-CO, where L is C.sub.2 -C.sub.8 -alkylene.
Dependencies are inferred from the claim text.