Claims
- 1. A single-component toner comprising:
- a binder resin comprising linear polyester resin (A) and polyester resin (B) bonded with urethane bonds, and a colorant, said linear polyester resin (A) composed of at least an etherified diphenol and an aromatic dicarboxylic acid, and having a weight average molecular weight of 5000 to 12000, a glass transition point of 60 to 80.degree. C., an acid value of 45 KOHmg/g or less and a molar ratio (carboxyl group/hydroxyl group) of 1.1 to 1.4;
- said polyester resin (B) composed of at least an etherified diphenol, an aromatic dicarboxylic acid, and at least one compound selected from the group consisting of aliphatic diols, polyols having three hydroxyl groups or more, aliphatic dicarboxylic acids substituted by C.sub.3 -C.sub.20 alkyl group and diols substituted by C.sub.3 -C.sub.20 alkyl group, and having a molar ratio (hydroxyl group/carboxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000 and a glass transition point of 20 to 50.degree. C.; and said binder resin prepared by mixing the linear polyester resin (A) and the polyester resin (B) which differs from the linear polyester resin (A) and treating the obtained mixture with an isocyanate compound to form said urethane bonds for chain prolongation.
- 2. The toner of claim 1, wherein said polyester resin (A) is mixed with said polyester resin (B) at a weight ratio of 8:2 to 3:7.
- 3. The toner of claim 1, wherein said isocyanate compound and said polyester resin (B) have a molar ratio (NCO/OH) of 0.8 to 1.5 of isocyanate group (NCO) of said isocyanate compound to hydroxyl group (OH) of said polyester resin (B).
- 4. The toner of claim 1, wherein said toner further comprises an off-set prevention agent.
- 5. The toner of claim 4, wherein said off-set prevention agent is an oxidized polyolefin.
- 6. The toner of claim 5, wherein said oxidized polyolefin is an oxidized polypropylene.
- 7. The toner of claim 1, wherein said binder resin has a glass transition point of 60 to 80.degree. C. and a softening point of 110 to 170.degree. C. and contains an insoluble component which is insoluble in methyl ethyl ketone at a content of 10 to 40 percent by weight.
- 8. The toner of claim 1, wherein said binder resin has an acid value of 25 KOHmg/g or less.
- 9. A single-component toner comprising:
- a binder resin comprising a linear polyester resin (A) and a polyester resin (B) bonded with urethane bonds, and a colorant, said linear polyester resin (A) having a molar ratio (carboxyl group/hydroxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000, a glass transition point of 60 to 80.degree. C. and an acid value of 45 KOHmg/g or less, said polyester resin (B) having a molar ratio (hydroxyl group/carboxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000 and a glass transition point of 20 to 50.degree. C.; and said binder resin prepared by mixing the linear polyester resin (A) and the polyester resin (B) which differs from the linear polyester resin (A) and treating the obtained mixture with an isocyanate compound to form said urethane bonds, wherein said toner further comprises an off-set prevention agent.
- 10. The toner of claim 9, wherein said off-set prevention agent is an oxidized polyolefin.
- 11. The toner of claim 10, wherein said oxidized polyolefin is an oxidized polypropylene.
- 12. A single-component toner comprising:
- a binder resin comprising a linear polyester resin (A) and a polyester resin (B) bonded with urethane bonds, and a colorant, said linear polyester resin (A) having a molar ratio (carboxyl group/hydroxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000, a glass transition point of 60 to 80.degree. C. and an acid value of 45 KOHmg/g or less, said polyester resin (B) having a molar ratio (hydroxyl group/carboxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000 and a glass transition point of 20 to 50.degree. C.; and said binder resin prepared by mixing the linear polyester resin (A) and the, polyester resin (B) which differs from the linear polyester resin (A) and treating the obtained mixture with an isocyanate compound to form said urethane bonds, wherein said binder resin has a glass transition point of 60 to 80.degree. C. and a softening point of 110 to 170.degree. C. and contains an insoluble component which is insoluble in methyl ethyl ketone at a content of 10 to 40 percent by weight.
- 13. A single-component toner comprising:
- a binder resin comprising a linear polyester resin (A) and a polyester resin (B) bonded with urethane bonds, and a colorant, said linear polyester resin (A) having a molar ratio (carboxyl group/hydroxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000, a glass transition point of 60 to 80.degree. C. and an acid value of 45 KOHmg/g or less, said polyester resin (B) having a molar ratio (hydroxyl group/carboxyl group) of 1.1 to 1.4, a weight average molecular weight of 5000 to 12000 and a glass transition point of 20 to 50.degree. C.; and said binder resin prepared by mixing the linear polyester resin (A) and the polyester resin (B) which differs from the linear polyester resin (A) and treating the obtained mixture with an isocyanate compound to form said urethane bonds, wherein said binder resin has an acid value of 25 KOHmg/g or less.
Priority Claims (2)
Number |
Date |
Country |
Kind |
2-143048 |
May 1990 |
JPX |
|
2-143049 |
May 1990 |
JPX |
|
Parent Case Info
This application is a continuation of application Ser. No. 07/707,786, filed May 30, 1991, now abandoned.
US Referenced Citations (8)
Foreign Referenced Citations (3)
Number |
Date |
Country |
0381896 |
Aug 1990 |
EPX |
63-56659 |
Mar 1988 |
JPX |
3-31858 |
Feb 1991 |
JPX |
Continuations (1)
|
Number |
Date |
Country |
Parent |
707786 |
May 1991 |
|