Abstract:
본 발명은 유기 감광체용 오버코트 형성용 조성물 및 이로부터 형성된 오버코트층을 채용한 유기 감광체에 관한 것으로서, 상기 유기 감광체는 도전성 지지체; 상기 도전성 지지체 상부에 형성된 감광층; 상기 감광층 상부에 형성되며, 화학식 1의 유기 실란 화합물, 알콜 용해성 고분자 및 용매를 포함하는 오버코트층 형성용 조성물을 코팅 및 열처리하여 얻어진 결과물로 이루어진 오버코트층을 포함하는 것을 특징으로 한다.
상기식중, R'은 C1-C20의 알킬기, 페닐기, 비닐기, 메타크릴옥시프로필기, 아미노프로필기, 아미노에틸아미노프로필기, 페닐아미노프로필기, 클로로프로필기, 메르캅토프로필기, 아크릴옥시프로필기, 3-글리시독시프로필기, 트리플루오로프로필기, 헵타데카플루오로데실기 및 이소시아네이트프로필기로 이루어진 군으로부터 선택된 하나이고, R''은 가수분해가능한 관능기로서, C1-C20의 알콕시기 또는 할로겐 원자이다. 본 발명에 의하면, 유기 실란 화합물, 알콜 용해성 고분자 및 용매를 포함하는 오버코트층 형성용 조성물을 이용하여 오버코트층을 형성하는 경우, 접착력 향상을 위하여 필수적으로 요구되던 프라이머 또는 접착층 코팅이 불필요하게 되어 막 코팅 과정을 단순화시킬 수 있다. 그리고 내마모성이 우수하여 전자사진용 유기 감광체의 수명을 향상시킬 수 있다. 또한, 전자 사진적인 화상 형성시, 대전 전위의 감소 및 잔류 전위의 상승을 완화시켜 수명 특성이 향상된 유기 감광체를 제조할 수 있다.
Abstract:
A composition forms an overcoat layer for an organic photoreceptor by combining an organic silane compound, an acrylic polymer, polyvinyl butyral and a solvent. The organic photoreceptor has increased electrical and mechanical properties, leading to improved life characteristics. Also, unlike when a single material of either acrylic polymer or silsesquioxane is used in forming an overcoat layer, when the composition of the present invention is used, it is not necessary to coat a primer or an adhesive layer, thereby simplifying a coating process and reducing the cost required in forming additive layers.
Abstract:
PURPOSE: A coating apparatus using a heat source is provided to prevent moisture absorbtion and falling of a photo-conductor by promptly drying the photo-conductor, thereby coating a drum in equal thickness. CONSTITUTION: In a coating apparatus including a solution container(37) filled with a photo-conductor(33) to coat a surface of a drum(31), the coating apparatus includes a heat source(35) separated from the drum and the solution container to move at regular speed according to the movement of the solution container and to supply heat to dry the photo-conductor of the surface of the drum, wherein the heat source includes a hot air generating unit generating hot air, a hot air supply unit supplying hot air to the drum, and a hot air passage connecting the hot air generating unit and the hot air supply unit to pass hot air.
Abstract:
PURPOSE: Provided is a double-layered constant-static type organic photoreceptor for electrophotography, which has a proper interface for charge transfer between a charge generation layer and a charge transport layer and can overcome contamination problem generated in coating the charge generation layer. CONSTITUTION: The double-layered constant-static type organic photoreceptor contains: a conductive support; the charge transport layer placed on the conductive support, which contains a first charge transport material which is soluble in an acetate solvent, a second charge transport material which is hardly soluble in the acetate solvent, and a binder resin; the charge generation layer placed on the charge transport layer. The first charge transport material is at least one selected from the charge transport material represented by the formula 1, wherein R1 and R2 are independently hydrogen, alkyl, aryl, or styryl, wherein at least one of R1 and R2 is the aryl or the styryl, R3 is alkyl, aralkyl, or aryl, R4 and R5 are independently hydrogen, alkyl, benzyl, or phenyl, and R6 is hydrogen, alkyl, alkoxy, or halogen. And the second charge transport material is selected from the charge transport material represented by the formula 2, wherein n is an integer of 2-6, R1 and R2 are independently alkyl, cycloalkyl, or aryl, or can form a ring by being connected with nitrogen, Y is a bond, carbon, -CR3, aryl, cycloalkyl, or cyclosiloxyl, wherein R3 is hydrogen, alkyl, or aryl, X is a linking group represented by -(CH2)m, wherein m is an integer of 4-10 and at least one methylene group is substituted by oxygen, carbonyl, or ester.
Abstract:
PURPOSE: Provided is an electrophotographic photoreceptor for use in a copying machine, a printer and an electrophotographic device, which minimizes the image defect and inhibits the expose potential increase to improve the electrical properties. CONSTITUTION: The electrophotographic photoreceptor comprises a conductive substrate, an undercoating layer and a photoreceptive layer, wherein the undercoating layer comprises a charge transport material soluble in an organic solvent and a binder resin. In particular, the organic solvent for dissolving the charge transport material is an alcohol solvent, a halogenated solvent or a mixed solvent thereof. Preferably, the binder resin is a polyamide resin.
Abstract:
PURPOSE: A composition for forming an overcoat layer of an organic photoreceptor, an organic photoreceptor employing the overcoat layer formed from the composition and an electrophotographic image formation method using the organic photoreceptor are provided, to improve electrical properties, abrasion resistance, lifetime and resistance against a wet toner of an organic photoreceptor. CONSTITUTION: The composition comprises 100 parts by weight of a poly(amino-ether); and 900-9,900 parts by weight of solvent. Preferably the poly(aminio-ether) is represented by the formula 1, wherein n is 10-400; and the solvent is at least one selected from the group consisting of 1-methoxy-2-propanol, methanol, ethanol, propanol, butanol and isopropanol. The organic photoreceptor comprises a conductive supporter; a photosensitive layer formed on the supporter; and an overcoat layer formed by coating the composition on the photosensitive layer and drying it. Preferably the overcoat layer has a thickness of 0.1-10 micrometers.
Abstract:
PURPOSE: A ground stripe, an organic photosensitive material including the ground stripe, an apparatus and a method for forming an electrophotographic image employing the photosensitive material are provided to form an image with high quality even after repeated electrophotographic cycles. CONSTITUTION: An organic photosensitive material includes at least one photoconductive element capable of possessing an electrophotographic latent image, a conductive substrate having a conductive surface, a conductive ground stripe, a charge transport compound, and a charge generation compound. The conductive ground stripe electrically comes into contact with the conductive substrate, being adjacent to the photoconductive element, and includes a film forming binder, conductive grains, and inorganic grains having Moh's hardness 5 or more.