JP2007004113A5

JP2007004113A5 -

Info

Publication number: JP2007004113A5
Application number: JP2005363509A
Authority: JP
Filing date: 2005-12-16
Publication date: 2008-10-09
Anticipated expiration: 2025-12-16

Description

特に、上記フッ化アルキル基を有する加水分解性シラン化合物として、上記式（３）で示される構造を有する加水分解性シラン化合物を用いる場合、Ｒｆ^３１の炭素数ｎ_Ａ（ｎ_Ａは６以上３１以下の整数）のもの（シラン化合物Ａ）と、炭素数ｎ_Ｂ（ｎ_Ｂは６以上３１以下の整数かつｎ_Ｂ≠ｎ_Ａ）のもの（シラン化合物Ｂ）とを併用すると、得られるポリシロキサンは、炭素数の異なるパーフルオロアルキル基を有することになる。パーフルオロアルキル基は、帯電部材の表面に向かって配向する傾向にあるため、帯電部材の表面層に含有されるポリシロキサンが炭素数の異なるパーフルオロアルキル基を有していれば、帯電部材の表面に向かって長さの異なるパーフルオロアルキル基が配向することになる。この場合、単一の長さのパーフルオロアルキル基が帯電部材の表面に向かって配向する場合に比べて、帯電部材の表面近傍のフッ素原子濃度が高くなり、帯電部材の表面自由エネルギーが低くなるため、長期間繰り返し使用した際の帯電部材の表面へのトナーや外添剤などの固着をより抑制することができる。
In particular, when a hydrolyzable silane compound having a structure represented by the above formula (3) is used as the hydrolyzable silane compound having a fluorinated alkyl group, the carbon number n _{A of} Rf ³¹ (n _A is 6 or more and 31). The following integer) (silane compound A) and a polysiloxane obtained by using a combination of carbon atoms n _B (n _B is an integer of 6 to 31 and n _B ≠ n _A ) (silane compound B) Will have perfluoroalkyl groups with different carbon numbers. Since the perfluoroalkyl group tends to be oriented toward the surface of the charging member, if the polysiloxane contained in the surface layer of the charging member has perfluoroalkyl groups having different carbon numbers, the charging member Perfluoroalkyl groups having different lengths are oriented toward the surface. In this case, the concentration of fluorine atoms in the vicinity of the surface of the charging member is higher and the surface free energy of the charging member is lower than when a single length of perfluoroalkyl group is oriented toward the surface of the charging member. For this reason, it is possible to further suppress sticking of toner, external additives, and the like to the surface of the charging member when repeatedly used for a long period of time.