Aqueous binder composition

A process for binding two or more layers of tissue fabrics derived from cellular pulp or cellulose fiber and having a weight per unit area of 18 to 25 g/m.sup.2, which comprises:

• (i) applying a binder composition having a viscosity of 600 to 35000 mPa.s and comprised of:
• (a) 10 to 80 parts by weight of an aqueous plastics dispersion which has a solids content of 30 to 70% by weight and is based on one or more copolymers from the group comprising vinyl acetate/ethylene copolymers, vinyl acetate/ethylene/N-methylol(meth)acrylamide terpolymers, alkyl acrylate/N-methylol(meth)acrylamide copolymers and vinyl acetate/ethylene/alkyl acrylate copolymers, or vinyl acetate/alkyl acrylate copolymers, which optionally have a N-methylol(meth)acrylamide content,
• (b) 50 to 300 parts by weight of an organic or inorganic filler which is sparingly soluble in water and has an average particle size of 0.5 to 100 .mu.m, and
• (c) 0 to 4 parts by weight of a thickener and/or at least 0.1 parts by weight of a dispersing agent to a portion of a single layer of tissue in an amount of 5 to 15 g/m.sup.2, affixing a further single layer of tissue thereto and drying to obtain a prelaminate;
• (2) Applying additional binder composition in an amount of 20 to 80 g/m.sup.2 to the prelaminate, affixing a further single layer of tissue thereto, and drying and
• (3) optionally repeating step (2) one or more times.