Imaging member
The presently disclosed embodiments are directed to overcoat layers useful in electrostatography. More particularly, the embodiments pertain to an electrostatographic imaging member with an improved overcoat layer including a polymeric binder that lowers the surface energy involved and reduces friction.
1. An electrostatographic imaging member comprising:
a substrate having a first and second side, wherein the substrate has a conductive surface;
an imaging layer disposed on the first side of the substrate, wherein the imaging layer comprises a charge transport component selected from the group consisting of N,N′-diphenyl-N,N′-bis(alkylphenyl)-1,1′-biphenyl-4,4-diamines, (N,N′-diphenyl-N,N′-bis[3-methylphenyl]-[1,1′-biphenyl]-4,4′-diamine), N,N′-diphenyl-N,N′-bis(chlorophenyl)-1,1′biphenyl-4,4′-diamine, N,N′-bis-(4-methylphenyl)-N,N′-bis(4-ethylphenyl)-1,1′-3,3′-dimethylbiphenyl)-4,4′-diamine, N,N′-bis-(3,4-dimethylphenyl)-4,4′-biphenyl amine, and combinations thereof;
an overcoat layer disposed on the imaging layer, wherein the overcoat layer comprises a polymeric binder formed from a monomer selected from the group consisting of a modified Bisphenol A polycarbonate poly(4,4′-isopropylidene diphenyl carbonate) having a viscosity-molecular weight of 68,200 and a contact angle with water of 98 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 75,100 and a contact angle with water of 97 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 53,000 and a contact angle with water of 95 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 39,500 and a contact angle with water of 96 degrees, and mixtures thereof; and
an anti-curl backing layer disposed on the second side of the substrate, wherein the anti-curl backing layer comprises an adhesive promoter that is a copolyester made by reacting monomers consisting of isophthalic acid and terephthalic acid, ethylene glycol and dimethyl propanediol.
2. The electrostatographic imaging member of claim 1 , wherein the polymeric binder has a coefficient of friction of 0.35.
3. The electrostatographic imaging member of claim 1 further including an undercoat layer disposed between the substrate and the imaging layer.
4. The electrostatographic imaging member of claim 1 , wherein the imaging layer is a charge transport layer.
5. The electrostatographic imaging member of claim 1 , wherein the imaging layer is a charge generating layer.
6. The electrostatographic imaging member of claim 1 , wherein the polymer binder is present in an amount of from about 50% to about 100% by weight of total weight of the overcoat layer.
7. An electrostatographic imaging member comprising:
a substrate having a first and second side and wherein the substrate has a conductive surface;
an imaging layer disposed on the first side of the substrate, wherein the imaging layer comprises a charge transport component selected from the group consisting of N,N′-diphenyl-N,N′-bis(alkylphenyl)-1,1′-biphenyl-4,4-diamines, (N,N′-diphenyl-N,N′-bis[3-methylphenyl]-[1,1-biphenyl]-4,4′-diamine), N,N′-diphenyl-N,N′-bis(chlorophenyl)-1,1′-biphenyl-4,4′-diamine, N,N′-bis-(4-methylphenyl)-N,N′-bis(4-ethylphenyl)-1,1′-3,3′-dimethylbiphenyl)-4,4′-diamine, N,N′-bis-(3,4-dimethylphenyl)-4,4′-biphenyl amine, and combinations thereof;
an overcoat layer on the imaging layer, wherein the overcoat layer comprises a polymeric binder formed from a monomer selected from the group consisting of a modified Bisphenol A polycarbonate poly(4,4′-isopropylidene diphenyl carbonate) having a viscosity-molecular weight of 68,200 and a contact angle with water of 98 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 75,100 and a contact angle with water of 97 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 53,000 and a contact angle with water of 95 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 39,500 and a contact angle with water of 96 degrees, and mixtures thereof, and the overcoat layer further comprises a charge transport molecule at a 97:3 ratio by weight of polymer binder to charge transport molecule; and
an anti-curl backing layer disposed on the second side of the substrate, wherein the anti-curl backing layer comprises an adhesive promoter that is a copolyester made by reacting monomers consisting of isophthalic acid and terephthalic acid, ethylene glycol and dimethyl propanediol.
8. The electrostatographic imaging member of claim 7 , wherein the imaging layer is a charge transport layer.
9. The electrostatographic imaging member of claim 7 further including a charge generating layer.
10. The electrostatographic imaging member of claim 7 , wherein the polymer binder is present in an amount of from about 50% to about 100% by weight of total weight of the overcoat layer.
11. The electrostatographic imaging member of claim 7 further including an undercoat layer disposed between the substrate and the imaging layer.
12. An image forming apparatus for forming images on a recording medium comprising:
a) an electrostatographic imaging member having a charge retentive-surface to receive an electrostatic latent image thereon, wherein the electrostatographic imaging member comprises a substrate having a first and second side and wherein the substrate has a conductive surface, an imaging layer disposed on the first side of the substrate, an anti-curl backing layer disposed on the second side of the substrate, and an overcoat layer disposed on the imaging layer, wherein the overcoat layer comprises a polymeric binder formed from a monomer selected from the group consisting of a modified Bisphenol A polycarbonate poly(4,4′-isopropylidene diphenyl carbonate) having a viscosity-molecular weight of 68,200 and a contact angle with water of 98 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 75,100 and a contact angle with water of 97 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 53,000 and a contact angle with water of 95 degrees, a modified Bisphenol Z polycarbonate poly(4,4′-diphenyl-1-1′cyclohexane carbonate) having a viscosity-molecular weight of 39,500 and a contact angle with water of 96 degrees, and mixtures thereof, wherein the anti-curl backing layer comprises an adhesive promoter that is a copolyester made by reacting monomers consisting of isophthalic acid and terephthalic acid, ethylene glycol and dimethyl propanediol, and;
b) a development member for applying a developer material to the charge-retentive surface to develop the electrostatic latent image to form a developed image on the charge-retentive surface;
c) a transfer member for transferring the developed image from the charge-retentive surface to an intermediate transfer member or a copy substrate; and
d) a fusing member for fusing the developed image to the copy substrate.
13. The image forming apparatus of claim 12 , wherein the polymer binder is present in an amount of from about 50% to about 100% by weight of total weight of the overcoat layer.
14. The image forming apparatus of claim 12 , wherein the imaging layer is a charge transport layer.
15. The image forming apparatus of claim 12 , wherein the polymer binder is present in an amount of from about 80% to about 100% by weight of total weight of the overcoat layer.
16. The electrostatographic imaging member of claim 1 , wherein the polymer binder is present in an amount of from about 80% to about 100% by weight of total weight of the overcoat layer.
17. The electrostatographic imaging member of claim 7 , wherein the polymer binder is present in an amount of from about 80% to about 100% by weight of total weight of the overcoat layer.