Toner for developing electrostatic latent image

Abstract

Abstract A toner suitable for developing an electrostatic latent image is described comprising (a) a polyester containing not less than 5% by weight of chloroform-insoluble component as binder resin and either (b) at least one of a first mold release agent which has the general formula; wherein R 1 and R 2 are independently a saturated or unsaturated aliphatic hydrocarbon group having not less than 10 carbon atoms, R 3 and R 4 are independently a hydrogen atom or a group represented by -OCR s wherein R 5 is a saturated or unsaturated hydrocarbon group and n is a positive integer, or (c) a mixture of a second mold release agent which contains at least 20% by weight of ester component, the needle penetration degree of said mold releasing agent being not more than 4, and a third mold release agent which is a polyolefin was or a compound of the general formula given above. 2. A toner according to claim 1 in which in component (b) n is from 1 to 5. 3. A toner according to claim 1 or 2 in which in component (b) R, and/or R 2 contains 10 to 23 carbon atoms. 4. A toner according to any one of claims 1 to 3 which contains 1 to 10% by weight of mold release agent. 5. A toner according to any one of claims 1 to 4 in which the second mold release agent is a wax having a melting point of 60 to 110°C. 6. A toner according to any one of claims 1 to 5 in which in component (c) the weight ratio of the ...

Inventors

• 👤 Masafumi Uchida
• 👤 Jiro Takahashi
• 👤 Hiroyuki Takagiwa
• 👤 Meizo Shirose

Bibliographic Details