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AssigneeSanyo Chemical Industries, Ltd.
InventorsTakashi Ono, Kazuki Sugiyama, Takaaki Bando, Yasuaki Ota, Takahiro Tanaka, Taiji Yamashita, Kakuhiro Kawaguchi
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A toner binder comprising a polyester, the end of which is partially esterified with a monocarboxylic acid and/or a monohydric alcohol, the polyhydric alcohol component of which comprises a C3 alkylene glycol (a21) and an aromatic-ring-bearing diol (a22) at an (a21)/(a22) molar ratio of 5/95 to 70/30, and which has an ester group concentration of 16 to 30 wt % and satisfies a specific relationship between the ester group concentration and the hydroxy value. The toner binder combines low-temperature fixability and storage stability under high-temperature conditions or heat-temperature and -humidity conditions, and exhibits excellent durability.
A toner binder comprising a polyester resin (A) having, as constitutional units, a polycarboxylic acid (a1) as a polycarboxylic acid component and a polyhydric alcohol (a2) as a polyhydric alcohol component and being esterified with a monocarboxylic acid (a3) and/or a monohydric alcohol (a4) at a part of the terminals thereof, wherein the ester group concentration of (A) based on the weight of (A) is 16 to 30% by weight, the polyhydric alcohol (a2) comprises an alkylene glycol (a21) having three carbon atoms and a diol (a22) having an aromatic ring, the molar ratio of (a21) to (a22) is (a21)/(a22)=5/95 to 70/30, and (A) fulfills the following condition 1:
Dependencies are inferred from the claim text.