Abstract: The present invention relates to a sheet-form or web-form copying material having an improved shelf life. More particularly, the invention relates to that part of copying materials of the type in question which contains the dye precursor by providing a new type of binder which may be used in conjunction with a variety of known dye precursors. Applied to the support material, it forms a unit of the pressure-sensitive copying material which, in combination with a plurality of known units containing dye acceptor material, forms pressure-sensitive copying material according to the invention.

Abstract: The present invention relates to a pressure-sensitive recording material ing improved storability, lightfastness and heat resistance, which comprises a unit containing a dye precursor or its solution and a unit containing a dye acceptor material which is capable of color formation by reaction with the dye precursor. The pressure-sensitive recording material according to the invention is characterized in that the dye acceptor material is an intimate mixture comprising(a) a 2-hydroxy-benzophenone of the general formula I ##STR1## or 3,5,7,3',4'-pentahydroxy-flavone of the formula II ##STR2## (b) a substituted benzotriazole of the general formula III ##STR3## and, optionally, an inert waxy binder. The invention further relates to further embodiments of this recording material with improved properties as well as process for producing the pressure-sensitive recording materials according to the invention.