Title:
TONER BINDER AND PROCESS FOR PRODUCING THE SAME
Document Type and Number:
WIPO Patent Application WO/2001/069325
Kind Code:
A1
Abstract:
A toner binder for dry toners which comprises a polyester; and a process for producing the toner binder. A known conventional technique for imparting low-temperature fixability and high-temperature non-offset properties to a toner binder is to use a mixture of two powdery polyesters. However, when the two polyesters mixed differ greatly in softening point, the effect of mixing is not obtained and pigments show poor dispersiblity during toner production. The toner binder and the process eliminate these problems. The toner binder comprises aggregates of binder resin particles comprising two polyesters (A) and (B), wherein the polyester (A) has a higher softening point than the polyester (B) and the polyesters (A) and (B) have been evenly mixed in each particle. The process for producing a toner binder is characterized by melt-mixing the two polyesters (A) and (B) at 80 to 180°C. The toner binder is used mainly as an ingredient for dry toners.
Inventors:
NAKANISHI HIDEO (JP)
KATO TOMOHISA (JP)
IWATA MASAKAZU (JP)
KATO TOMOHISA (JP)
IWATA MASAKAZU (JP)
Application Number:
PCT/JP2001/001755
Publication Date:
September 20, 2001
Filing Date:
March 07, 2001
Export Citation:
Assignee:
SANYO CHEMICAL IND LTD (JP)
NAKANISHI HIDEO (JP)
KATO TOMOHISA (JP)
IWATA MASAKAZU (JP)
NAKANISHI HIDEO (JP)
KATO TOMOHISA (JP)
IWATA MASAKAZU (JP)
International Classes:
G03G9/087; (IPC1-7): G03G9/087; C08G63/127
Foreign References:
| JPS6415755U | 1989-01-26 | |||
| JP2000039738A | 2000-02-08 | |||
| JPH10246983A | 1998-09-14 | |||
| JPH08272138A | 1996-10-18 | |||
| JPH11133660A | 1999-05-21 | |||
| JPH04211272A | 1992-08-03 |
Other References:
See also references of EP 1271255A4
None
None
Attorney, Agent or Firm:
Fujiwara, Michihiko (Uji-jadzuka Uji-shi, Kyoto, JP)
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