The invention relates to a polyisocyanate mixture containing at least one polyisocyanate based on 1,5-diisocyanatopentane and at least one organic solvent, said organic solvent being inert with respect to isocyanate groups and the polyisocyanate mixture has a solid body content of ?35 and ?65 wt. %. The invention also relates to a two-component system, to a method for producing a coating, to the thus obtained coatings and to a composite consisting of the coating and a substrate.

A polyisocyanate modified with sulphamic acid and a mixture thereof, the preparation method thereof, and the use thereof in the production of polyurethane, especially as a cross-linking ingredient in the field of aqueous coatings and adhesives containing groups that are capable of reacting with isocyanate groups.

Provided is an electrophotographic electroconductive member, including: an electroconductive support; an electroconductive layer; and a surface layer in order, wherein an impedance is 1.010.sup.3 to 1.010.sup.8 at an outer surface of the electroconductive member, in the surface layer, an electronic electroconductive agent is dispersed, the electroconductive layer has a matrix containing a cross-linked product of a first rubber and domains each containing a cross-linked product of a second rubber and electroconductive particles, and wherein, and wherein among the domains observed in specified observation regions, 80% by number or more of the domains satisfy (1) and (2): (1) a proportion of sectional areas of the electroconductive particles with respect to the domain is 20% or more; (2) A/B is 1.00 to 1.10 when A is a perimeter of the domain and B is an envelope perimeter.