Method for producing a thermodeformable polymer/fiber composite

A process for producing a thermoformable polymer/fiber composite using a fibrous substrate, an organic di- or polyisocyanate compound I and a polymer P, where

• the fibrous substrate is introduced into a gas stream, then
• the fibrous substrate in the gas stream is contacted with an aqueous dispersion of a polymer P having a glass transition temperature Tg and an organic di- or polyisocyanate compound I, then
• the fibrous substrate that has been contacted with the aqueous dispersion of the polymer P and the organic di- or polyisocyanate compound I is dried in the gas stream and then deposited, then
• the deposited fibrous substrate obtained is converted to a fiber web, and then
• the fiber web obtained is consolidated at a temperature ≥Tg to give a thermoformable polymer/fiber composite,
• which comprises effecting the aqueous dispersion of the polymer P by free-radically initiated emulsion polymerization of a mixture of ethylenically unsaturated monomers P [monomers P] in an aqueous medium in the presence of a polymer A, where the polymer A is formed from
• a) 80% to 100% by weight of at least one ethylenically unsaturated mono- and/or dicarboxylic acid [monomers A1] and
• b) 0% to 20% by weight of at least one further ethylenically unsaturated monomer which differs from the monomers A1 [monomers A2], in copolymerized form,
• and where the monomers P are chosen in terms of type and amount such that the polymer P obtained has a glass transition temperature Tg≥20° C. measured according to DIN EN ISO 11357-2 (2013-09).