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21. 发明专利

JP2002003586A UNSATURATED POLYESTER AND METHOD OF PRODUCING THE SAME 失效
公开(公告)号：JP2002003586A
公开(公告)日：2002-01-09
申请号：JP2000189515
申请日：2000-06-23
申请人： DAINIPPON INK & CHEMICALS
发明人： MAEKAWA FUMIHIKO , KUWANA YASUHIRO , DEMURA SATOSHI , TAKAHASHI KATSUJI
IPC分类号： C08J5/18 , C08F283/01 , C08F299/04 , C08G63/181 , C08G63/52 , H01B3/42
摘要： PROBLEM TO BE SOLVED: To provide an unsaturated polyester having excellent thermal resistance, low thermal expansion, and processability together with low dielectric characteristics, namely low dielectric constant and low dielectric loss tangent, to provide a cross-linked polyester composition by further polymerizing the unsaturated polyester and to provide a method of producing it. SOLUTION: This unsaturated polyester consists of a polyester structural unit (I) and a fumarate structural unit (C), the former comprising a structural unit (A) expressed by phthaloyl group, isophthaloyl group, terephthaloyl group or naphtyl group or the like and a structural unit (B) expressed by divalent secondary and/or tertiary alkoxy group. This cross-linked polyester composition is produced by further polymerization of the polyester.

22. 发明专利

JP2000089486A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JP2000089486A
公开(公告)日：2000-03-31
申请号：JP25665798
申请日：1998-09-10
申请人： DAINIPPON INK & CHEMICALS
发明人： KUWANA YASUHIRO , ARAKAWA HIROMICHI
IPC分类号： G03G5/043 , G03G5/05 , G03G5/06
摘要： PROBLEM TO BE SOLVED: To provide an practicably more preferable electrophotographic photoreceptor by improving the environment resistant characteristic which is an increasing hindrance in the practicable use of the electrophotographic photoreceptor formed with layers having a charge generating function as multiple layers, i.e., the image quality from low temp. and low humidity to high temp. and high humidity. SOLUTION: This electrophotographic photoreceptor is constituted by successively laminating the layer which is formed by dispersing org. pigments exhibiting an (n) type semiconductor characteristic into resins and has the charge generating function, a layer which is formed by dispersing org. pigments exhibiting a (p) type semiconductor characteristic into a resin and has the charge generating function and a charge transfer layer on a conductive substrate. In such a case, the layer in contact with the conductive base is the layer which is formed by dispersing the org. pigments exhibiting the (n) type semiconductor characteristic into the resin and has the charge generating function and the resins of the layer consist of at least two kinds of the resins. The one kind of the resin of these resins is the resin of the same kind as the resin which is formed by dispersing the org. pigments exhibiting the (p) type semiconductor characteristic of the upper layer into the resin and has the charge generating function. In addition, the relation between the weight ratio of the charge generating agent in the charge generating layer and the resin, defined as P and the weight ratio of the resin, defined as B, is specified to 1

23. 发明专利

JPH11184129A ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH11184129A
公开(公告)日：1999-07-09
申请号：JP35477097
申请日：1997-12-24
申请人： DAINIPPON INK & CHEMICALS
发明人： KUWANA YASUHIRO , MATSUDA YUKITO
IPC分类号： G03G5/14
摘要： PROBLEM TO BE SOLVED: To obtain an electrophotographic photoreceptor which does not cause image defects due to peeling even after repeated use and ensures stable image quality by forming an undercoat layer contg. an org. pigment and a rosin compd. in a polyamide resin. SOLUTION: An undercoat layer contg. an org. pigment and a rosin compd. in a polyamide resin and a photosensitive layer are successively laminated on an electrically conductive substrate. The content of the org. pigment in the undercoat layer is preferably 5-5O wt.% and the content of the rosin compd. is preferably 0.4-2 wt.% based on the weight of the org. pigment. The org. pigment is preferably a perylene pigment. The polyamide resin is preferably an alcohol-soluble polyamide. The rosin compd. is, e.g. natural rosin such as gum rosin or wood rosin or a polymer of the natural rosin.

24. 发明专利

JPH10268533A LAMINATED ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH10268533A
公开(公告)日：1998-10-09
申请号：JP7121897
申请日：1997-03-25
申请人： DAINIPPON INK & CHEMICALS
发明人： KUWANA YASUHIRO , ARAKAWA HIROMICHI , HOSAKA MASAKI , ISHIMORI MOTOKAZU
IPC分类号： G03G5/00 , G03G5/047 , G03G5/06
摘要： PROBLEM TO BE SOLVED: To obtain a photoreceptor which is sufficient in the improvement of image characteristics and may be easily and stably produced for a long period of time by using pigments treated with active energy rays and/or active gases as n type semiconductor pigments and/or p type semiconductor pigments. SOLUTION: This electrophotographic photoreceptor is constituted by forming photosensitive layers 2, which are successively laminated with a first charge generating transfer layer 6 formed by dispersing the n type semiconductor pigments 3 in a binder resin 5, a second charge generating layer 7 formed by dispersing the p type semiconductor pigments 4 in the binder resin 5 and a second charge layer 8 formed by dispersing a charge generating material and a hole transfer material in the resin in this order, on a conductive substrate 1. The n type semiconductor pigments 3 and/or the p type semiconductor pigments 4 are the pigments treated with the active energy rays and/or the active gases. The n type semiconductor pigments and/or the active gas treatment is preferably executed by irradiating the pigments with the active energy rays in the presence of the active gases and/or under the flow of, for example, the active gases. The samples of the active gases include, for example, gases, such as, oxygen or ozone, and compds. which turn to gases of hydrochloric acid, nitric acid, etc.

25. 发明专利

JPH07140678A COATING MATERIAL FOR ELECTROPHOTOGRAPHIC PHOTORECEPTOR AND ELECTROPHOTOGRAPHIC PHOTORECEPTOR 失效
公开(公告)号：JPH07140678A
公开(公告)日：1995-06-02
申请号：JP28920093
申请日：1993-11-18
申请人： DAINIPPON INK & CHEMICALS
发明人： KUWANA YASUHIRO , ARAKAWA HIROMICHI
IPC分类号： G03G5/05
摘要： PURPOSE:To obtain a coating material capable of preservation over a long period of time, ensuring low environmental toxicity and having stable quality and to obtain an electrophotographic photoreceptor having a photosensitive layer formed with the coating material and repeatedly giving stable high-quality printed images from an LD printer, an LED printer, an LCD printer, etc. CONSTITUTION:This coating material contains a photoconductive material, a coating film forming resin and an org. solvent contg. dichloromethane, fluorinated arom. hydrocarbon and aliphatic alcohol. This electrophotographic photoreceptor has a photosensitive layer formed with this coating material.

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