Claims
- 1. An element bearing an electrographically formed image, said element comprising:
- (A) a substrate bearing an electrographically-formed toner image of toner particles, and
- (B) an abrasion- and scratch-resistant, crosslinked polymeric overcoat layer bonded to said toner image-bearing substrate, said overcoat layer having been formed by:
- (1) coating said toner image-bearing sustrate with a curable coating composition consisting essentially of (a) either (i) a mixture of a siloxy-containing polycarbinol and an acrylated urethane or (ii) a siloxy-containing acrylated urethane, and (b) a multifunctional acrylate of the formula: ##STR17## wherein p is an integer from 1 to 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is
- hydrogen or ##STR18## provided that when p is 1, Y.sup.4 is ##STR19## and (2) curing said coating to bond it to said toner image-bearing substrate.
- 2. The element of claim 1 which is an electrographic element comprising a support and superposed thereon a toner image-bearing layer.
- 3. The element of claim 2 which is an electrophotographic element and in which said toner image-bearing layer is a photoconductive layer.
- 4. The element of claim 1 wherein said toner particles comprise a colorant in a polymeric binder.
- 5. The element of claim 4 wherein said substrate is transparent.
- 6. The element of claim 1 wherein said siloxy-containing polycarbinol is represented by the formula (I): ##STR20## wherein R, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.7, R.sup.8, R.sup.9, R.sup.10 and R.sup.11 are independently alkyl, ##STR21## R.sup.12 and R.sup.13 are independently hydrogen, halo, alkyl or aryl, R.sup.14 is alkylene, and n is an integer of from 1 to 100; R.sup.6 is ##STR22## where R.sup.12, R.sup.13, R.sup.14 and n are as defined above; m.sub.1 is an integer of from 1 to 100; m.sub.2 is an integer of from 0 to 100; m.sub.3 is an integer of from 0 to 4; m.sub.4 is an integer of from 0 to 100; and m.sub.5 is 0 or 1, provided that when m.sub.3 is 0, at least two of said R, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.7, R.sup.8, R.sup.9, R.sup.10 and R.sup.11 are ##STR23## and when m.sub.3 is 1, at least one of said R, R.sup.1, R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.7, R.sup.8, R.sup.9, R.sup.10 and R.sup.11 is ##STR24##
- 7. The element of claim 6 wherein each of R.sup.2, R.sup.3, R.sup.4, R.sup.5, R.sup.7, R.sup.8, R.sup.9, R.sup.10, and R.sup.11 is methyl; each of m.sub.1 and m.sub.5 is 1; m.sub.2 is 1 to 100; m.sub.4 is 0; R.sup.12 and R.sup.13 are independently alkyl; and R.sup.14 is alkylene of from 2 to 6 carbon atoms.
- 8. The element of claim 7 wherein each of R and R.sup.1 is methyl; m.sub.3 is 2 to 4; and n is 1 to 25.
- 9. The element of claim 1 wherein said acrylated urethane is represented by the formula (II): ##STR25## wherein X.sup.1 and X.sup.2 are independently hydrogen, halo or alkyl; X.sup.3 and X.sup.4 are independently alkylene, cycloalkylene or arylene; and X.sup.5 is a divalent aliphatic, alicyclic or aromatic radical.
- 10. The element of claim 9 wherein each of X.sup.1 and X.sup.2 is hydrogen; X.sup.3 is alkylene; X.sup.4 arylene; and X.sup.5 is alkylene, cycloalkylene or arylene.
- 11. The element of claim 10 wherein X.sup.4 is phenylene and X.sup.5 is alkylene.
- 12. The element of claim 11 wherein said acrylated urethane has the formula: ##STR26##
- 13. The element of claim 1 wherein said curable coating composition comprises said siloxy-containing acrylated urethane.
- 14. The element of claim 1 wherein said siloxy-containing acrylated urethane is the reaction product of a siloxy-containing polycarbinol, a polyisocyanate, and an acrylate polycarbinol, a least one functional group reactive with said polyisocyanate and at least one acrylic group.
- 15. The element of claim 14 wherein said acrylate compound is a hydroxyl-containing acrylic ester.
- 16. The element of claim 1 wherein p is 2 or 3; Y.sup.1 and Y.sup.2 are independently hydrogen or methyl; and Y.sup.3 is alkylene.
- 17. The element of claim 1 wherein said curable coating composition comprises a mixture of a diacrylate and a triacrylate.
- 18. The element of claim 1 wherein said curable coating composition comprises a free radical photoinitiator.
- 19. The element of claim 18 wherein said free radical photoinitiator is a haloalkyl-substituted aryl ketone compound.
- 20. The element of claim 19 wherein said photoinitiator is a haloalkylbenzophenone.
- 21. The element of claim 20 wherein said haloalkylbenzophenone is represented by the formula (IV): ##STR27## wherein t.sub.1 and t.sub.2 are independently integers from 0 to 5 provided that the sum of t.sub.1 and t.sub.2 is at least 1; and Z.sub.1 and Z.sub.2 are independently halo, alkoxycarbonyl, alkyl or haloalkyl, provided that at least one of Z.sub.1 and Z.sub.2 is haloalkyl.
- 22. The element of claim 21 wherein t.sub.1 and t.sub.2 are independently 1 or 2; and Z.sub.1 and Z.sub.2 are independently alkyl or haloalkyl.
- 23. The element of claim 22 wherein each of t.sub.1 and t.sub.2 is 1; and each of Z.sub.1 and Z.sub.2 is haloalkyl.
- 24. An electrophotographic element comprising:
- (A) a transparent electrically conductive support,
- (B) a photoconductive layer superposed on said support and comprising a photoconductor dispersed in a binder, said layer bearing a toner image of toner particles comprising a colorant and a thermoplastic resin binder, and
- (C) an abrasion- and scratch-resistant, crosslinked polymeric overcoat bonded to said toned photoconductive layer, said overcoat having been formed by:
- (1) coating said toned photoconductive layer with a curable coating composition consisting essentially of (a) either (i) a mixture of siloxy-containing polycarbinol and an acrylated urethane; or (ii) a siloxy-containing acrylated urethane; (b) a multifunctional acrylate of the formula: ##STR28## wherein p is an integer from 1 to b 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is hydrogen or ##STR29## provided that when p is 1, Y.sup.4 is ##STR30## and (c) a free radical photoinitiator; and (2) curing said coating to bond it to said toned photoconductive layer.
- 25. The element of claim 24 wherein said curable coating composition comprises (a) a siloxy-containing acrylated urethane, (b) a mixture of trimethylolpropane triacrylate and 1,6-hexanediol diacrylate, and (c) 4,4'-bis(chloromethyl)benzophenone.
- 26. A method of protecting an element bearing an electrographically-formed toner image of toner particles against abrasion and scratches, said method comprising:
- (1) coating said toner image with a curable coating composition which forms an abrasion- and scratch-resistant, crosslinked polymeric layer upon curing, said coating composition consisting essentially of (a) either (i) a mixture of siloxy-containing polycarbinol and an acrylated urethane or (ii) a siloxy-containing acrylated urethane, and (b) a multifunctional acrylate of the formula: ##STR31## wherein p is an integer from 1 to 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is hydrogen or ##STR32## provided that when p is 1, Y.sup.4 is ##STR33## and (2) curing said coating to bond it to said element.
- 27. The method of claim 26 wherein said curable coating is subjected to radiation sufficient to cure said coating.
- 28. The method of claim 27 wherein said curable coating composition comprises a free radical photoinitiator, and said curing step (2) is accomplished with ultraviolet light.
- 29. The method of claim 26 wherein said toner image is fixed prior to said coating step (1).
- 30. The method of claim 29 wherein said toner fixing is accomplished with heat.
- 31. A method of providing an element bearing an electrographically-formed toner image of toner particles which is protected against abrasion and scratches, said method comprising:
- (1) electrographically forming a toner image on a first element comprising a support having thereon an imaging layer with toner particles;
- (2) transferring said toner image to a second element comprising a receiving substrate;
- (3) coating said toner image-bearing substrate with a curable coating composition which forms an abrasion- and scratch-resistant crosslinked polymeric layer upon curing, said coating composition consisting essentially of (a) either (i) a mixture of a siloxy-containing polycarbinol and an acrylated urethane or (ii) a siloxy-containing acrylated urethane, and (b) a multifunctional acrylate of the formula: ##STR34## wherein p is an integer from 1 to 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is hydrogen or ##STR35## provided that when p is 1, Y.sup.4 is ##STR36## and (4) curing said coating to bond it to said toner image-bearing substrate.
- 32. A method of providing an element bearing an electrographically-formed toner image of toner particles which is protected against abrasion and scratches, said method comprising:
- (1) forming an electrostatic latent image on a first element comprising a support having thereon an imaging layer;
- (2) transferring said latent image to a second element comprising a receiving substrate;
- (3) forming a toner image on said receiving substrate;
- (4) coating said toner image-bearing substrate with a curable coating composition which forms an abrasion- and scratch-resistant, crosslinked polymeric layer upon curing, said coating composition consisting essentially of (a) either (i) a mixture of a siloxy-containing polycarbinol and an acrylated urethane or (ii) a siloxy-containing acrylated urethane, and (b) a multifunctional acrylate of the formula: ##STR37## wherein p is an integer from 1 to 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is hydrogen or ##STR38## provided that when p is 1, Y.sup.4 is ##STR39## and (5) curing said coating to bond it to said toner image-bearingsubstrate.
- 33. A method of protecting an element bearing an electrographically-formed, unfixed toner image of toner particles which is protected against abrasion and scratches, said method comprising:
- (1) fixing said unfixed toner image by coating it with a curable coating composition which forms an abrasion- and scratch-resistant, crosslinked polymeric layer upon curing, said coating composition consisting essentially of (a) either (i) a mixture of a siloxy-containing polycarbinol and an acrylated urethane or (ii) a siloxy-containing acrylated urethane, and (b) a multifunctional acrylate of the formula: ##STR40## wherein p is an integer from 1 to 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is hydrogen or ##STR41## provided that when p is 1, Y.sup.4 is ##STR42## and (2) curing said coating to bond it to said element.
- 34. A method of providing an electrophotographic film having a toner image of toner particles which is protected against abrasion and scratches, said film comprising a transparent electrically conductive support and a photoconductive layer superposed thereon, said method comprising:
- (1) applying a blanket electrostatic charge to said photoconductive layer;
- (2) forming a latent image on said photoconductive layer by selectively dissipating said electrostatic charge;
- (3) forming an unfixed toner image on said photoconductive layer by applying a developer composition comprising toner particles;
- (4) fixing said unfixed toner image by coating said photoconductive layer with a radiation-curable coating composition which forms an abrasion- and scratch-resistant, crosslinked, polymeric layer upon radiation curing, said coating composition consisting essentially of (a) either (i) a mixture of a siloxy-containing polycarbinol and an acrylated urethane or (ii) a siloxy-containing acrylated urethane, (b) a multifunctional acrylate of the formula: ##STR43## wherein p is an integer from 1 to 3; Y.sup.1 and Y.sup.2 are independently hydrogen, halo or alkyl; Y.sup.3 is a polyvalent aliphatic, alicyclic or aromatic group; and Y.sup.4 is hydrogen or ##STR44## provided that when p is 1, Y.sup.4 is ##STR45## and (c) a free radical photoinitiator; and (5) subjecting said coating to radiation sufficient to cure said coating and to bond it to said photoconductive layer.
Parent Case Info
This is a continuation of application Ser. No. 414,128, filed Sept. 2, 1982 now abandoned.
US Referenced Citations (11)
Foreign Referenced Citations (3)
Number |
Date |
Country |
2924687 |
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DEX |
56-025749 |
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JPX |
1458617 |
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GBX |
Non-Patent Literature Citations (3)
Entry |
Rodenburg and Contois, J. Appl. Photo. Eng., 5(4), 1979, pp. 244-248. |
Research Disclosure, publication 10928, May, 1973, pp. 67-72. |
Research Disclosure, publication 10938, May, 1973, pp. 61-67. |
Continuations (1)
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Number |
Date |
Country |
Parent |
414128 |
Sep 1982 |
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