Carrier for electrophotographic developer, method for manufacturing the carrier, and coating liquid for the method
AssigneeRicoh Company, Ltd.
InventorsSatoshi Mochizuki, Yasuo Asahina, Kohsuke Suzuki, Tomomi Suzuki
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Abstract
A carrier for electrophotographic developer, including a core material and a resin layer formed on the surface of the core material, wherein the resin layer has a plastic deformation degree not less than 0.5 μm and an elastic deformation degree not less than 0.5 μm. The resin layer is preferably prepared by crosslinking a mixture including an acrylic resin having a reactive hydroxyl group and at least one of a perfectly-alkylated melamine compound and a perfectly-alkylated guanamine compound.
Claims48
A carrier for electrophotographic developer, comprising a core material and a resin layer on a surface of the core material, wherein the resin layer comprises a crosslinked resin prepared by crosslinking a mixture comprising an acrylic resin having a reactive hydroxyl group and a perfectly-alkylated melamine or guanamine compound having an average degree of polymerization of not greater than 2, and the resin layer has a plastic deformation degree not less than 0.5 μm and an elastic deformation degree not less than 0.5 μm.
A carrier for electrophotographic developer, comprising a core material and a resin layer on a surface of the core material, wherein the resin layer comprises a crosslinked resin prepared by crosslinking a mixture comprising an acrylic resin having a reactive hydroxyl group and a perfectly-alkylated melamine compound having an average polymerization degree not greater than 2.
A carrier for electrophotographic developer, comprising a core material and a resin layer on a surface of the core material, wherein the resin layer comprises a crosslinked resin prepared by crosslinking a mixture comprising an acrylic resin having a reactive hydroxyl group and a perfectly-alkylated guanamine compound having an average polymerization degree not greater than 2.
A method for manufacturing a carrier for a developer, comprising the steps of:
- coating a surface of a core material with a coating liquid comprising an acrylic resin having a reactive hydroxyl group and a perfectly-alkylated melamine compound having an average polymerization degree not greater than 2 to prepare a carrier having a resin layer thereon;
- and
- crosslinking the resin layer.
A method for manufacturing a carrier for a developer, comprising the steps of:
- coating a surface of a core material with a coating liquid comprising an acrylic resin having a reactive hydroxyl group and a guanamine compound having an average polymerization degree not greater than 2 to prepare a carrier having a resin layer thereon;
- and
- crosslinking the resin.
A coating liquid for coating a surface of a carrier, comprising an acrylic resin having a reactive hydroxyl group and a hydroxyl value of from 20 to 100 mgKOH/g, and a guanamine compound having an average polymerization degree not greater than 2, wherein the acrylic resin and the guanamine compound are crosslinked upon application of heat.
An electrophotographic developer, comprising:
- a carrier comprising a core material and a resin layer on a surface of the core material, wherein the resin layer comprises a crosslinked resin prepared by crosslinking a mixture comprising an acrylic resin having a reactive hydroxyl group and a perfectly-alkylated melamine or guanamine compound having an average degree of polymerization of not greater than 2, and the resin layer has a plastic deformation degree not less than 0.5 gm and an elastic deformation degree not less than 0.5 μm;
- and a toner.
Dependencies are inferred from the claim text.