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US4812379A Expired / Lapsed US ⏱️ 0.0 years remaining

Electrophotographic toners containing an additive reinforcing the cationic charge

Assignee: Bayer AG
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Filing: 1987-02-03
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Granted: 1989-03-14
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Expires: 2007-02-03
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Abstract

Abstract Postively charged electrophotographic toners contain, in addition to conventional resin and pigment particles, an additive reinforcing the cationic charge, of the general formula ##STR1## in which R 1 and R 2 each represent hydrogen, chlorine, bromine, hydroxyl, C 1 -C 4 -alkoxy or carboxyl, A represents C 1 -C 5 -alkylene or --C 6 H 4 --CH 2 --(m or p), m represents 0 to 1, n represents 1 or 2 K.sup.⊕ represents ##STR2## R 3 represents C 1 -C 18 -alkyl, carbamoyl-C 1 -C 2 -alkyl, C 1 -C 4 -alkoxycarbonyl-C 1 -C 2 -alkyl, benzyl, cyclohexyl or allyl, R 4 represents C 1 -C 4 -alkyl or a single bond linked to D, R 5 represents C 1 -C 4 -alkyl, D represent --CH 2 , --CH 2 --CO--, --CH 2 --CO--NH--or --CH 2 --CO--NH--CH 2 -- W represents ##STR3## --CO--or a single bond, Z represents --CH 2 --, ##STR4## --O--, --S--, --SO 2 --or a single bond and An.sup.⊖ represents an anion.

Inventors

  • 👤 Horst Harnisch
  • 👤 Roderich Raue

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-11-05 13:10
CPC Classifications
G; G03; G03G; G03G9/00; G03G9/08; G03G9/097; G03G9/09733; G03G9/09741

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 163 words
Electrophotographic toners comprising an additive reinforcing the cationic charge, of the formula ##STR61## in which R 1 and R 2 each represent hydrogen, chlorine, bromine, hydroxyl, C 1 -C 4 -alkoxy or carboxyl, A represents C 1 -C 5 -alkylene or --C 6 H 4 --CH 2 -- (m or p), m represents 0 or 1, n represents 1 or 2 K.sup.⊕ represents ##STR62## R 3 represents C 1 -C 18 -alkyl, carbamoyl-C 1 -C 2 -alkyl, C 1 -C 4 -alkoxycarbonyl-C 1 -C 2 -alkyl, benzyl, cyclohexyl or allyl, R 4 represents C 1 -C 4 -alkyl or a single bond linked to D, R 5 represents C 1 -C 4 -alkyl, D represents --CH 2 --, --CH 2 --CO13 , --CH 2 --CO--NH-- or --CH 2 --CO--NH--CH 2 -- W represents ##STR63## --CO-- or a single bond, Z represents --CH 2 --, ##STR64## --O--, --S--, --SO 2 -- or a single bond and An.sup.⊖ represents an anion, resin and pigment particles.
Claim 2
Dependent Claim 163 words
Electrophotographic toners comprising an additive reinforcing the cationic charge, of the formula ##STR61## in which R 1 and R 2 each represent hydrogen, chlorine, bromine, hydroxyl, C 1 -C 4 -alkoxy or carboxyl, A represents C 1 -C 5 -alkylene or --C 6 H 4 --CH 2 -- (m or p), m represents 0 or 1, n represents 1 or 2 K.sup.⊕ represents ##STR62## R 3 represents C 1 -C 18 -alkyl, carbamoyl-C 1 -C 2 -alkyl, C 1 -C 4 -alkoxycarbonyl-C 1 -C 2 -alkyl, benzyl, cyclohexyl or allyl, R 4 represents C 1 -C 4 -alkyl or a single bond linked to D, R 5 represents C 1 -C 4 -alkyl, D represents --CH 2 --, --CH 2 --CO13 , --CH 2 --CO--NH-- or --CH 2 --CO--NH--CH 2 -- W represents ##STR63## --CO-- or a single bond, Z represents --CH 2 --, ##STR64## --O--, --S--, --SO 2 -- or a single bond and An.sup.⊖ represents an anion, resin and pigment particles.
Claim 3
Dependent Claim 96 words
Electrophotographic toners according to claim 1, wherein the additive reinforcing the cationic charge is of the formula ##STR65## in which A 1 represents C 2 -C 5 -alkylene, K 1 ⊕ represents ##STR66## R 6 represents C 1 -C 16 -alkyl, carbamoylmethyl or benzyl, R 7 represents methyl or ethyl or a single bond linked to D, R 8 represents methyl or ethyl, W 1 represents ##STR67## Z 1 represents --CH 2 --, ##STR68## --O-- or --SO 2 -- and X.sup.⊖ represents an anion, and D, m and n having the meaning given in claim 1.
Claim 4
Dependent Claim 12 words
Electrophotographic toners according to claim 1, further comprising a magnetically attractable material.
Claim 5
Dependent Claim 25 words
A method of reinforcing the positive charge in electrophotographic toners comprising adding to the toner an additive reinforcing the cationic charge according to claim 1.

References Cited (Backward Citations)

US4680245A Cited
US4686166A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-03-13 1992-09-12 1993-03-14 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-03-13 1996-09-12 1997-03-14 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-03-13 2000-09-12 2001-03-14 $7700.00 Window Closed / Lapsed

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