Biasable transfer composition and member
View Patent ↗The present invention provides conductivity control agents derived from the trans esterification of dialkyl phosphonium 5-sulfoisophthalate salts with poly(alkylene glycols). The conductivity control agents can be used with semi-conductive rolls, belts and other biasable members. The inclusion of the conductivity control agent in the polymeric or polyurethane elastomers extends the electrical life of the polymer biasable member in low humidity environments. Additionally, the resistivity of the elastomeric polymers or polyurethane on the biasable member is controlled to a desirable value by adjusting the conductivity control agent level in the polymer elastomers.
1. A member for electrically cooperating with a conductive support surface to attract charged toner particles from the support surface towards the member which comprises a conductive substrate for supporting a uniform potential thereon and at least one layer which comprises a polymeric material having incorporated therein in an amount sufficient to provide the polymeric material with a resistivity of from about 10 6 to about 5.0×10 11 ohm cm a conductivity control agent from 0.001 to 5.000 weight percent, based on the total weight of the polymeric material, the conductivity control agent formed from the transesterification of dialkyl phosphonium 5-sulfoisophthalate salts with poly(alkylene glycols) represented by the formula:
where R comprises substituted or unsubstituted alkylene,
R 1 , R 2 , R 3 and R 4 comprise substituted or unsubstituted alkyl or aryl groups which may be the same or different,
R 5 comprises alkyl or
where R is defined above and with the proviso that when m =0, at least one R 5 comprises
m is an integer with a value of 0-10; and
n is an integer with a value from 1 to 1,000.
2. The member of claim 1 wherein R comprises ethylene, 1,2-propylene, 1,4-butylene, methylene, hexafluoropropylene, tetrafluoroethylene, difluoromethylene.
3. The member of claim 1 wherein R 1 , R 2 , R 3 and R 4 comprise phenyl, 4-methylphenyl, 2,4,6-trimethylphenyl, 2,4,6-trimethoxyphenyl, 2,3,4,5,6-pentafluorophenyl, methyl, ethyl, propyl, butyl, isopropyl, cyclohexyl, t-butyl or octyl.
4. The member of claim 1 wherein the layer has a resistivity of from 2.0×10 8 to about 2.0×10 10 ohm-cm.
5. The member of claim 1 wherein the layer has a hardness of about 10 Shore A and 80 Shore D.
6. The member of claim 1 , wherein the polymeric material is selected from the group consisting of elastormeric polymers, polyurethanes, polyurethane foams, adhesive polymers, plastics and rubbers.
7. The member of claim 1 wherein the conductive substrate comprises an endless belt.
8. The member of claim 1 wherein the conductive substrate comprises a roll.
9. The member of claim 1 wherein the conductive support surface comprises a photoconductor.