Abstract: Provided is a cleaning member, comprising an elastic member that includes polyurethane, wherein: when tan ? of a test piece sampled from the elastic member is measured in the temperature range of ?20° C. to +60° C., the peak temperature of a peak indicating the maximum value of tan ? is at 15.0° C. or below; the maximum value of tan ? is 0.20 to 0.55; tan ? at a temperature of 55° C. is 0.13 or larger; and where the detected quantity of all ions obtained when the test piece is heated at a rate of temperature increase of 10° C./second to 1000° C. using a direct-sampling mass spectrometer is M1 and the integrated intensity of a peak in a derived ion thermogram that corresponds to a range of m/z values originating in multifunctional isocyanate with at least three isocyanate groups is M2, M2/M1 is at least 0.001.

Abstract: A vehicle windshield wiper blade comprising: a blade support portion; and a lip portion, wherein the lip portion has a tapered portion having a cross section that is taken along a direction perpendicular to the longitudinal direction of the wiper blade and that has a width that gradually decreases from a side closer to the blade support portion towards a direction farthest away from the blade support portion, the lip portion has a tip surface and first and second tapered surfaces constituting the tapered portion, and, in a specific observation region of the first and second tapered surfaces, the average value of the elastic modulus measured at a 0.1 ?m pitch is 15-470 MPa and the coefficient of variation of the elastic modulus is at most 17.6%.

Abstract: A vehicle wiper blade comprises a blade support part and a lip part coupled swingably with the blade support part via a neck. The lip part comprises polyurethane. The polyurethane comprises a reactant of a composition including an isocyanate compound which includes diisocyanate and tri- or higher functional polyfunctional isocyanate, and an alcohol which includes tri- or higher functional polyfunctional alcohol. The diisocyanate has an aromatic ring in a molecule. When a molecule of the polyurethane is ionized with a mass spectrometer of a direct sample injection system, then obtained M1, M2 and M3 satisfy the following relation: M2/M1 is 0.001 to 0.028, M3/M1 is 0.020 to 0.110, and M2/M3 is 0.013 to 0.300, and a concentration of the polyfunctional alcohol in the polyurethane is 0.12 mmol/g to 0.65 mmol/g.

Abstract: A wiper blade comprising: a hand grip portion; and an elastic portion supported by the hand grip portion and that is pressed against a surface to be cleaned; the elastic portion having, on a tip side, a main surface opposing a member to be cleaned, and a tip surface that forms a tip side edge together with the main surface, and in a specific observation region of the tip surface and the main surface, the average value of elastic modulus values obtained through measurement at a 0.1 ?m pitch being 15 MPa to 470 MPa, and the coefficient of variation of the elastic modulus being 17.6% or less.

Abstract: A vehicle windshield wiper blade comprising: a blade support portion; and a lip portion, wherein the lip portion has a tapered portion having a cross section that is taken along a direction perpendicular to the longitudinal direction of the wiper blade and that has a width that gradually decreases from a side closer to the blade support portion towards a direction farthest away from the blade support portion, the lip portion has a tip surface and first and second tapered surfaces constituting the tapered portion, and, in a specific observation region of the first and second tapered surfaces, the average value of the elastic modulus measured at a 0.1 ?m pitch is 15-470 MPa and the coefficient of variation of the elastic modulus is at most 17.6%.

Abstract: A cleaning wiper blade comprises a hand grip part and an elastic part. The elastic part comprises a polyurethane. The polyurethane comprises a reactant of a composition including an isocyanate compound which includes diisocyanate and polyfunctional isocyanate, and an alcohol which includes polyfunctional alcohol. The diisocyanate has an aromatic ring in a molecule. When a molecule of the polyurethane is ionized with a mass spectrometer of a direct sample injection system, then obtained M1, M2 and M3 satisfy the is 0.013 to 0.300, and a concentration of the polyfunctional alcohol in the polyurethane is 0.12 mmol/g to 0.65 mmol/g.

Abstract: The electrophotographic electroconductive member includes a support having an electroconductive outer surface, and an electroconductive layer on the surface of the support. The electroconductive layer has a matrix containing a crosslinked product of a first rubber, and domains dispersed in the matrix, and the domains each contain a crosslinked product of a second rubber and electroconductive particles. The matrix has a volume resistivity R1 of more than 1.0×1012 ?·cm, and the domains each have a volume resistivity R2 lower than the volume resistivity R1 of the matrix. The electroconductive layer further has a pore, and an inner wall of the pore is constituted by a part of the matrix and a part of the domains. The domains constituting the inner wall protrude into the pore at sites on the inner wall.

Abstract: An electro-conductive member for an electrophotographic image forming apparatus for which a change in resistance value is small even when a large current is applied at a high voltage for a long period of time is provided. The electro-conductive member includes a support having an electro-conductive outer surface and an electro-conductive layer on the outer surface of the support, in which the electro-conductive layer has a matrix including a cross-linked product of a first rubber and domains dispersed in the matrix, the domains include a cross-linked product of a second rubber different from the first rubber and an electrically conductive agent, and the cross-linked product of the second rubber has, in a molecule, a structural unit represented by Structural Formula (I). [—(CH2)n—O—]??Structural Formula (I) In Structural Formula (I), n is an integer of 1 to 3.