US4684596A
Expired / Lapsed
US
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Electrographic toner and developer composition containing quaternary ammonium salt charge-control agent
Assignee: Eastman Kodak Co
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Filing: 1986-02-18
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Granted: 1987-08-04
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Expires: 2006-02-18
Abstract
Abstract The present invention relates to the use of quaternary ammonium salt as a charge-control agent for electrostatic toner contained in a dry developer composition. The dry, particulate, electrostatic toner composition of the present invention comprises (a) a polymeric binder and (b) a charge-control agent comprising an N-benzyl quaternary ammonium salt, wherein the benzyl ring contains at least one substituent with a Hammett substituent constant that is greater than zero.
Inventors
- 👤 Steven M. Bonser
- 👤 Douglas E. Bugner
- 👤 Lawrence P. DeMejo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:40
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09741
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
41 words
A dry, particulate, electrostatic toner composition comprising (a) a polymeric binder, and (b) a charge-control agent comprising an N-benzyl quaternary ammonium salt, wherein the benzyl ring contains at least one substituent with a Hammett substituent constant that is greater than zero.
Claim 2
Dependent Claim
41 words
A dry, particulate, electrostatic toner composition comprising (a) a polymeric binder, and (b) a charge-control agent comprising an N-benzyl quaternary ammonium salt, wherein the benzyl ring contains at least one substituent with a Hammett substituent constant that is greater than zero.
Claim 3
Dependent Claim
123 words
A dry, particulate, electrostatic toner composition comprising (a) a polymeric binder, and (b) a charge control agent comprising quaternary ammonium salt having the formula: ##STR5## wherein X - is an anion, R is hydrogen, a straight or branched chain alkyl group having 12 to 24 carbon atoms, an aryl group or a substituted aryl group; R 1 is any substituent with a Hammett substituent constant that is greater than zero; R 2 is H or any substituent with a Hammett substituent constant that is greater than zero; R 3 and R 4 , which may be the same or different, are alkyls containing from 1 to 5 carbon atoms; or, when taken together, R, R 3 and R 4 form a ring system.
Claim 4
Dependent Claim
123 words
A dry, particulate, electrostatic toner composition comprising (a) a polymeric binder, and (b) a charge control agent comprising quaternary ammonium salt having the formula: ##STR5## wherein X - is an anion, R is hydrogen, a straight or branched chain alkyl group having 12 to 24 carbon atoms, an aryl group or a substituted aryl group; R 1 is any substituent with a Hammett substituent constant that is greater than zero; R 2 is H or any substituent with a Hammett substituent constant that is greater than zero; R 3 and R 4 , which may be the same or different, are alkyls containing from 1 to 5 carbon atoms; or, when taken together, R, R 3 and R 4 form a ring system.
Claim 5
Dependent Claim
22 words
A composition according to claim 2 wherein R 1 is NO 2 , CN, CF 3 , CH 3 CO or halide.
Claim 6
Dependent Claim
16 words
A composition according to claim 1 wherein the polymeric binder also has a colorant dispersed therein.
Claim 7
Dependent Claim
20 words
A composition according to claim 1 wherein said polymeric binder has a softening temperature from 65° C. to 200° C.
Claim 8
Dependent Claim
10 words
A composition according to claim 2 wherein R is octadecyl.
Claim 9
Dependent Claim
22 words
A composition according to claim 1 wherein the toner contains from 0.05 to 2 percent by weight of said quaternary ammonium salt.
Claim 10
Dependent Claim
14 words
A composition according to claim 1 wherein said quaternary ammonium salt is (p-nitro)benzyldimethyloctadecylammonium chloride.
Claim 11
Dependent Claim
57 words
A dry, particulate, electrostatic toner composition comprising (a) a polymeric binder, (b) a pigment or dye stuff, and (c) from about 0.05 to about 2 percent by weight of a charge-control agent comprising an N-benzyl quaternary ammonium salt, wherein the benzyl ring contains at least one substituent with a Hammett substituent constant that is greater than zero.
Claim 12
Dependent Claim
57 words
A dry, particulate, electrostatic toner composition comprising (a) a polymeric binder, (b) a pigment or dye stuff, and (c) from about 0.05 to about 2 percent by weight of a charge-control agent comprising an N-benzyl quaternary ammonium salt, wherein the benzyl ring contains at least one substituent with a Hammett substituent constant that is greater than zero.
Claim 13
Dependent Claim
143 words
A dry, particulate electrostatic toner composition comprising (a) a polymeric binder, (b) a pigment or dye stuff in an amount sufficient to color the particles, and (c) from about 0.05 to about 2 percent by weight of a quaternary ammonium salt of the formula: ##STR6## wherein X - is an anion, R is hydrogen, a straight or branched chain alkyl group having 12 to 24 carbon atoms, an aryl group or a substituted aryl group; R 1 is any substituent with a Hammett substituent constant that is greater than zero; R 2 is H or any substituent with a Hammett substituent constant that is greater than zero; R 3 and R 4 , which may be the same or different, are alkyls containing from 1 to 5 carbon atoms; or, when taken together, R, R 3 and R 4 form a ring system.
Claim 14
Dependent Claim
143 words
A dry, particulate electrostatic toner composition comprising (a) a polymeric binder, (b) a pigment or dye stuff in an amount sufficient to color the particles, and (c) from about 0.05 to about 2 percent by weight of a quaternary ammonium salt of the formula: ##STR6## wherein X - is an anion, R is hydrogen, a straight or branched chain alkyl group having 12 to 24 carbon atoms, an aryl group or a substituted aryl group; R 1 is any substituent with a Hammett substituent constant that is greater than zero; R 2 is H or any substituent with a Hammett substituent constant that is greater than zero; R 3 and R 4 , which may be the same or different, are alkyls containing from 1 to 5 carbon atoms; or, when taken together, R, R 3 and R 4 form a ring system.
Claim 15
Dependent Claim
30 words
An electrostatic developer composition comprising (a) carrier particles, and (b) toner particles which are electrostatically attractable to said carrier particles, said toner particles having the composition defined in claim 1.
Claim 16
Dependent Claim
17 words
A composition according to claim 1 wherein the polymeric binder is styrene-butyl-acrylate copolymer, polyester, polycarbonate or polyamide.
Claim 17
Dependent Claim
37 words
A developer according to claim 11 wherein the toner contains 0.05 to 2 parts by weight of said quaternary ammonium salt and 2 to 8 parts by weight of carbon black per 100 parts of polymeric binder.
Claim 18
Dependent Claim
51 words
A method for developing latent images which comprises forming an electrostatic latent image on an imaging member, contacting the resulting image with a developer composition comprised of toner particles having the composition defined in claim 1, followed by transferring the image to a suitable substrate and permanently affixing the image thereto.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-03 | 1991-02-02 | 1991-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-03 | 1995-02-02 | 1995-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-03 | 1999-02-02 | 1999-08-04 | $7700.00 | Window Closed / Lapsed |