JP2005301260A5

JP2005301260A5 -

Info

Publication number: JP2005301260A5
Application number: JP2005078403A
Authority: JP
Filing date: 2005-03-18
Publication date: 2008-05-01
Anticipated expiration: 2025-03-18

Description

すなわち本発明は、軸芯体と、該軸芯体の外周面に、導電性弾性層と、該導電性弾性層の外周を被覆する樹脂表面層との２層を少なくとも有する現像ローラであって、
該樹脂表面層が、ポリエーテルポリオール成分（Ａ）とイソシアネート成分（Ｂ）とを反応させてなる、含有窒素濃度が２．０質量％以上４．０質量％以下のウレタン樹脂（Ｉ）と、荷電制御剤（ＩＩ）とを含有し、
該ポリエーテルポリオール成分（Ａ）が、２官能ポリエーテルポリオール化合物（ａ）と２官能イソシアネート化合物（ｂ）とを反応させてなる、重量平均分子量（Ｍｗ）が１００００〜５００００、分子量分散度がＭｗ／Ｍｎが１．０以上３．０以下かつＭｚ／Ｍｗが１．０以上２．５以下のポリウレタンポリオールプレポリマー（Ａ ¹ ）であることを特徴とする現像ローラである。 That is, the present invention is a developing roller having at least two layers of a shaft core body, and a conductive elastic layer and a resin surface layer covering the outer periphery of the conductive elastic layer on the outer peripheral surface of the shaft core body. ,
A urethane resin (I) having a nitrogen concentration of 2.0 mass% or more and 4.0 mass% or less, wherein the resin surface layer is obtained by reacting the polyether polyol component (A) and the isocyanate component (B); A charge control agent (II) ,
The polyether polyol component (A) is obtained by reacting a bifunctional polyether polyol compound (a) with a bifunctional isocyanate compound (b), and has a weight average molecular weight (Mw) of 10,000 to 50,000 and a molecular weight dispersity of Mw. The developing roller is a polyurethane polyol prepolymer (A ¹ ) having / Mn of 1.0 or more and 3.0 or less and Mz / Mw of 1.0 or more and 2.5 or less .

Claims

A developing roller having at least two layers of a shaft core, and a conductive elastic layer and a resin surface layer covering the outer periphery of the conductive elastic layer on an outer peripheral surface of the shaft core,
A urethane resin (I) having a nitrogen concentration of 2.0 mass% or more and 4.0 mass% or less, wherein the resin surface layer is obtained by reacting the polyether polyol component (A) and the isocyanate component (B); A charge control agent (II) ,
The polyether polyol component (A) is obtained by reacting a bifunctional polyether polyol compound (a) with a bifunctional isocyanate compound (b), and has a weight average molecular weight (Mw) of 10,000 to 50,000 and a molecular weight dispersity of Mw. A developing roller, which is a polyurethane polyol prepolymer (A ¹ ) having a / Mn of 1.0 to 3.0 and Mz / Mw of 1.0 to 2.5 .

The developing roller according to claim 1 , wherein the bifunctional isocyanate compound (b) is diphenylmethane diisocyanate.

The bifunctional polyether polyol (a) is, the developing roller according to claim 1 or 2, characterized in that any one or a mixture of polypropylene glycol and polytetramethylene glycol.

The developing roller according to any one of claims 1 to 3, wherein the content of nitrogen concentration is 3.5 or less wt% 2.5 wt% or more.

The charge control agent (II) is, the developing roller according to any one of claims 1 to 4, characterized in that an electron-donating compound.

6. The developing roller according to claim 5 , wherein the electron donating compound is a triphenylmethane dye or a nigrosine dye.

The polyurethane polyol prepolymer (A ¹¹ 7) Mw / Mn is 2.2 or more and 3.0 or less, and Mz / Mw is 1.6 or more and 2.5 or less. Development roller.