Claims
- 1. A toner for developing an electrostatic image, comprising:toner particles, which are comprised of 100 parts by weight of a binder resin, and 0.5 to 20 parts by weight of a long-chain compound, wherein the binder resin comprises a vinyl resin having (i) an acid value of 10-50 mgKOH/g, (ii) an OH value of at most 20, (iii) peaks at least in a molecular weight region of 3.5×103-2×104 and a molecular weight region of 1×105-1×106, respectively, in a molecular weight distribution according to GPC, (iv) a molecular weight distribution according to GPC such that a molecular weight region of at most 4.5×104 and a region of a larger molecular weight than 4.5×104 provide an areal ratio of 3:7-8.5:1.5, wherein the vinyl resin has a number-average molecular weight (Mn) of 2.5×103-5×104 and a weight-average molecular weight (Mw) of 1×104-1.5×106 the long-chain compound comprises a long-chain alkyl alcohol having (a) an OH value of 20-100 mgKOH/g, (b) a melting point of at least 91° C., (c) Mw/Mn of at most 3 and the long-chain alkyl alcohol is represented by the following formula (3): CH3(CH2)xCH2OH wherein X is 35-200, and is contained so as to satisfy conditions of the following formulas (1) and (5): acid value of binder resin+OH value of long-chain alkyl alcohol>(¼)×OH value of binder resin, Formula (1) fr×(acid value of binder resin)+fa×(OH value of long-chain alkyl alcohol)−(¼)×fr×(OH value of binder resin)>10 Formula 5 wherein fr and fa denote content factors of the binder resin and long-chain alkyl alcohol, respectively, wherein fr=(R/(a+α+R) and fa=(a/(a+α+R) and R is the content of the binder resin, a is the content of the long-chain alkyl alcohol, and α is the content of THF-insoluble resinous matter other than the long-chain alkyl alcohol.
- 2. The toner according to claim 1, wherein the long-chain alkyl alcohol contains at least 50 wt. % of a long-chain alkyl alcohol component having at least 37 carbon atoms.
- 3. The toner according to claim 1, wherein the vinyl resin has an Mn of 3×103-2×104 and an Mw of 2.5×104-1.25×106.
- 4. The toner according to claim 1, wherein the vinyl resin has a glass transition point of 45-80° C.
- 5. The toner according to claim 4, wherein the vinyl resin has a glass transition point of 55-70° C.
- 6. The toner according to claim 1, wherein the long-chain alkyl alcohol has an Mn of 150-4,000 and an Mw of 500-10,000.
- 7. The toner according to claim 6, wherein the long-chain alkyl alcohol has an Mn of 250-2,500 and an Mw of 600-8,000.
- 8. The toner according to claim 1, wherein the vinyl resin includes a resin component in a molecular weight region of at most 4.5×104 showing an acid value of 3-80 mgKOH/g and a resin component in a molecular weight region of larger than 4.5×104 showing an acid value of 0-60 mgKOH/g, the molecular weight regions being respectively based on GPC.
- 9. The toner according to claim 8, wherein the vinyl resin includes a resin component in a molecular weight region of at most 4.5×104 showing an acid value of 5-70 mgKOH/g and a resin component in a molecular weight region of larger than 4.5×104 showing an acid value of 0-50 mgKOH/g.
- 10. The toner according to claim 9, wherein the vinyl resin includes a resin component in a molecular weight region at most 4.5×104 showing an acid value of 10-60 mgKOH/g and a resin component in a molecular weight region of larger than 4.5×104 showing an acid value of 0-40 mgKOH/g.
- 11. The toner according to claim 1, wherein the value of [fr×(acid value of binder resin)+fa×(OH value of long-chain alkyl alcohol)] in Formula 5is in a range of 14-50.
Priority Claims (3)
Number |
Date |
Country |
Kind |
5-354164 |
Dec 1993 |
JP |
|
6-123295 |
May 1994 |
JP |
|
6-203024 |
Aug 1994 |
JP |
|
CROSS-REFERENCE TO THE RELATED APPLICATION
This application is a division of application Ser. No. 08/992,427, filed on Dec. 18, 1997, now U.S. Pat. No. 6,623,901, which, in turn, is a continuation of application Ser. No. 08/361,526, filed Dec. 22, 1994, now abandoned.
US Referenced Citations (29)
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EP |
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Oct 1994 |
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Non-Patent Literature Citations (2)
Entry |
Patent Abstracts of Japan, vol. 12, No. 48 (P-666) [2895], Feb. 1988 of JP 62-195676. |
Derwent Abstract No. AN 91-257358 of JP 3-168651 dated 1991. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
08/361526 |
Dec 1994 |
US |
Child |
08/992427 |
|
US |