Toner containing a dimer of diarylguanidine type compound for developing electrostatic image

• US 5,084,369 A
• Filed: 03/13/1990
• Issued: 01/28/1992
• Est. Priority Date: 03/13/1989
• Status: Expired due to Fees

• Current Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Original Assignee: Canon Kabushiki Kaisha (Canon Inc.)
• Inventors: Hagiwara, Kazuyoshi, Tanaka, Katsuhiko
• Primary Examiner(s): Goodrow, John
• Application Number:
  US07/492,137
• Time in Patent Office: 686 Days
• Field of Search: 430/110, 430/106, 430/106.6
• US Class Current: 430/108.21
• CPC Class Codes: G03G 9/09775 containing atoms other than carbon, hydrogen or oxygen G03G9/09741 - G03G9/09766 take precedence

Abstract

A toner for developing an electrostatic image comprises a binder resin and a dimer of a diarylguanidine type compound. The dimer is represented by the general formula (I) below: ##STR1## wherein R¹, R², R³, R⁴, R⁵, R⁶, R¹ a, R² a, R³ a, R⁴ a, R⁵ a and R⁶ a are respectively a hydrogen atom, an alkyl group, an amino group, an alkoxy group, or an aryl group which may have a substituent, and may be the same with or diffrent from each other; adjacent groups may be linked together to form a ring; and A is a linking group.

Claims

1. A toner for developing an electrostatic image, comprising a binder resin and a dimer of a diarylguanidine type compound.

2. The toner according to claim 1, wherein the dimer comprises a compound represented by the general formula (I) below:

##STR19## where R¹, R², R³, R⁴, R⁵, R⁶, R¹ a, R² a, R³ a, R⁴ a, R⁵ a, and R⁶ a are respectively a hydrogen atom, an alkyl group, an amino group, an alkoxy group, or an aryl group which may have a substituent, and may be the same with or different from each other;

adjacent groups may be linked together to form a ring; and

A is a linking group.

3. The toner according to claim 1, wherein the linking group has a partial structure represented by the formula:

##STR20## wherein l, m, and n are respectively an integer of from 0 to 8, and R⁷ and R⁸ are respectively any one of a hydrogen atom, an alkyl group, an amino group, an aryl group, and an alkoxy group; and

R⁷ and R⁸ may be the same with or different from each other.

4. The toner according to claim 1, wherein the dimer comprises a compound represented by the general formula (Ia) below:

##STR21## where R¹, R², R³, R⁴, R⁵, and R⁶ are respectively a hydrogen atom, an alkyl group, an amino group, an alkoxy group, or an aryl group which may have a substituent, and may be the same with or different from each other;

adjacent groups may be linked together to form a ring; and

A is a linking group.

5. The toner according to claim 4, wherein the linking group A has a partial structure represented by the formula:

##STR22## wherein l, m, and n are respectively an integer of from 0 to 8, and R⁷ and R⁸ are respectively any one of a hydrogen atom, an alkyl group, an amino group, an aryl group, and an alkoxy group; and

R⁷ and R⁸ may be the same with or different from each other.

6. The toner according to claim 1, wherein the dimer is contained in an amount of from 0.1 to 10 parts by weight per 100 parts by weight of the binder resin.

7. The toner according to claim 1, wherein the dimer is contained in an amount of from 0.1 to 5 parts by weight per 100 parts by weight of the binder resin.

8. The toner according to claim 1, wherein the binder resin comprises a styrene type copolymer or a polyester resin.

9. The toner according to claim 1, wherein the binder resin comprises a crosslinked styrene type copolymer.

10. The toner according to claim 1, wherein the toner has a positive chargeability.

11. The toner according to claim 1, wherein the toner contains a magnetic material in an amount of from 40 to 150 parts by weight per 100 parts of the resin.

12. The toner according to claim 1, wherein the toner contains a dye or a pigment in an amount of from 0.1 to 20 parts by weight per 100 parts by weight of the binder resin.

13. The toner according to claim 1, wherein the toner contains a dye or a pigment in an amount of from 0.5 to 10 parts by weight per 100 parts by weight of the binder resin.

14. The toner according to claim 1, wherein the toner is a cyan toner.

15. The toner according to claim 1, wherein the toner is a magenta toner.

16. The toner according to claim 1, wherein the toner is a yellow toner.

17. The toner according to claim 1, wherein the dimer is selected from the group of compounds consisting of the compounds represented by the following formulas:

##STR23## wherein Me denotes a methyl group, Et an ethyl group, and iPr an isopropyl group.