申请人:EASTMAN KODAK COMPANY
公开号:EP0690359A2
公开(公告)日:1996-01-03
The invention provides rolls, belts and other biasable members having at least one layer or coating of an elastomeric resilient polyurethane formed by reacting:
(a) a polyisocyanate prepolymer comprising the reaction product of:
(i) a saturated aliphatic polyisocyanate, a saturated cycloaliphatic polyisocyanate, or an aromatic polyisocyanate; and
(ii) a polyol free of aliphatic unsaturation; and
(b) a hardening mixture comprising:
(i) a polyol of (a) (ii) or a diamine free of aliphatic unsaturation, or a mixture thereof; and,
(ii)as a conductivity control agent for controlling the resistivity of the elastomeric polyurethane, from 0.001 to 5.0 weight percent, based on the total weight of the polyurethane, of an ammonium tetrahaloferrate salt having the formula:
wherein R, R¹, R and R³ are the same or different and are independently selected from hydrogen; an unsubstituted alkyl group having from 1 to 24 carbon atoms; a substituted alkyl group having from 1 to 24 carbon atoms substituted with one or more hydroxy-, alkoxy-, nitro-, cyano-, keto- or halo-groups; a cycloalkyl group having from 3 to 7 carbon atoms; an unsubstituted aryl group having from 6 to 14 carbon atoms; a substituted aryl group having from 6 to 14 carbon atoms substituted with one or more hydroxy-, alkoxy-, amino-, nitro-, cyano-, keto- or halo-groups; an alkaryl group having from 1 to 20 carbon atoms in the alkyl group and 6 to 14 carbon atoms in the aryl group; an aralkyl group having from 1 to 4 carbon atoms in the alkyl group and 6 to 14 carbon atoms in the aryl group; or wherein any two or more of R, R¹, R, or R³ can be interconnected to one another to form a 5 to 14 membered saturated or unsaturated ring system, and X, which can be the same or different, is selected from fluorine, chlorine, bromine or iodine.
The biasable members find use in the transfer of electrostatographic toner images from a photoconductor to a final support sheet where the member electrically cooperates with a photoconductor to establish a directional force field therebetween.
本发明提供的辊子、传送带和其他可偏置部件至少有一层或一层通过反应形成的弹性回弹聚氨酯涂层:
(a) 多异氰酸酯预聚物,包括以下物质的反应产物
(i) 饱和脂肪族多异氰酸酯、饱和环脂族多异氰酸酯或芳香族多异 氰酸酯;和
(ii) 不含脂肪族不饱和度的多元醇;以及
(b) 一种硬化混合物,包括
(i) (a)(ii)的多元醇或不含脂肪族不饱和物的二胺,或它们的混合物;以及
(ii) 作为控制弹性聚氨酯电阻率的传导性控制剂,以聚氨酯总重量为基准,加入 0.001 至 5.0 重量百分数的四卤铁酸铵盐,其式如下
其中 R、R¹、R 和 R³ 相同或不同,且独立选自氢;具有 1 至 24 个碳原子的未取代烷基;具有 1 至 24 个碳原子的被一个或多个羟基、烷氧基、硝基、氰基、酮基或卤基取代的取代烷基;具有 3 至 7 个碳原子的环烷基; 具有 6 至 14 个碳原子的未取代芳基; 具有 6 至 14 个碳原子的被一个或多个羟基、烷氧基、氨基、硝基、氰基、酮基或卤素基取代的取代芳基;在烷基中具有 1 至 20 个碳原子、在芳基中具有 6 至 14 个碳原子的烷芳基; 在烷基中具有 1 至 4 个碳原子、在芳基中具有 6 至 14 个碳原子的芳烷基; 或其中任意两个或多个 R、R¹、R 或 R³ 可相互连接,形成 5 至 14 个成员的饱和或不饱和环系统,且 X(可以相同或不同)选自氟、氯、溴或碘。
这种可偏置构件可用于将电致发光调色剂图像从感光导体转移到最终支持片材上,在此过程中,构件与感光导体电性配合,在两者之间建立定向力场。