The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 15, 1994
Filed:
Feb. 24, 1993
Hideki Ohta, Ikoma, JP;
Tatsuo Imafuku, Higashiosaka, JP;
Masami Tsujihiro, Katano, JP;
Toshiro Tokuno, Takarazuka, JP;
Hiroshi Shimoyama, Osaka, JP;
Nobuhiro Hirano, Osaka, JP;
Mita Industrial Co., Ltd., Osaka, JP;
Abstract
Toner for developing electrostatic images contains at least a colorant and a charge control dye in a binding resin which is the main component thereof, the toner having a surface dye density of less than 5.times.10.sup.-3 g/g and containing a monomer having a charge control polar group within the range of 0.01 to 5 weight percent based on the weight of the toner. The binding resin is preferably formed from at least one kind of monomer selected from a group consisting of vinyl aromatic monomers, acrylic type monomers, vinyl ester type monomers, vinyl ether type monomers, diolefin type monomers and monoolefin type monomers, and further preferably from at least one kind of monomer selected from a group consisting of styrene, ester acrylate and ester methacrylate. Also, the binding resin may be formed from at least one kind of monomer selected from a group consisting of polyester, phenol and epoxy resins. It is desirable that the colorant be used in 0.1 to 50 parts by weight for every 100 parts by weight of the polymerizable monomer. A magnetic pigment may also be used in addition to or instead of the colorant. In this case, it is desirable that the magnetic pigment be used in 1 to 200 parts by weight, and preferably in 5 to 100 parts by weight, for every 100 parts by weight of the polymerizable monomer.