Abstract: Pressure sensitive paper adhesive tape which is especially designed for use in libraries and archives to restore, preserve and assemble paper substrates such as books, documents, charts, drawings, engravings and the like. It contains a transparent to opaque base paper weighing 10-50 g/m.sup.2 which is coated on one side with a self-adhesive (self-sticking) material, and the coated side of the tape may be covered with a silicon-treated separating paper. The self-adhesive material composition consists essentially of:60-85 parts by weight of copolymerisates consisting essentially of from 50-90 wt. % acrylates whose alcohol component has 2 to 12 C atoms, and 10-50 wt. % styrene;5-20 parts by weight of alkali metal and/or alkaline earth metal salts of polyacrylic acids;3-15 parts by weight of primary softeners based on alkylbenzyl phthalates;5-15 parts by weight of alkylphenol polyglycol ethers; and1-4 parts by weight of calcium carbonate;wherein the total of all parts by weight amounts to 100.