Process for producing a prepreg, comprising the steps of: a) providing a reactive composition comprising at least the following constituents: ∘ at least one blocked hardener which is preferably an internally blocked uretdione having an NCO functionality of at least two, ∘ at least one binder which is a polyol compound having an OH functionality of 3 to 6 and which has at least one polar functional group selected from an ester, carbonate, amide, urethane, urea, thioester or thiocarbonate functionality; ∘ at least one co-binder which is an epoxy resin, ∘ at least one hardener which corresponds to the co-binder and is selected from the group comprising the following substance classes: aliphatic polyamines, cycloaliphatic polyamines, polyetheramines, polymercaptans or polyamidoamines, polycarboxylic acids, polycarboxylic anhydrides; b) providing fibres; c) coating the fibres with the reactive composition; d) exposing at least the reactive composition to heat to perform a first crosslinking reaction, in the course of which hardener and binder are converted to a thermoplastic polymer, the fibres being embedded into the thermoplastic polymer; e) obtaining a prepreg comprising the thermoplastic polymer with the fibres embedded therein, characterized in that the reactive composition is provided in such a way that the glass transition temperature, measured by the DSC method according to DIN 53765 in the second heating curve at 10 K/min, of the thermoplastic polymer is above 30°C, through i) use of a polyol compound or a mixture of a number of polyol compounds as binder, the OH number determined according to DIN 53 240-2 or mean OH number of which is above 300 mg KOH/g, and/or ii) choice of the proportion of corresponding hardener in the reactive composition at greater than 2% by weight, based on the total solids content of the reactive composition. a) providing a reactive composition comprising at least the following constituents: ∘ at least one blocked hardener which is preferably an internally blocked uretdione having an NCO functionality of at least two, ∘ at least one binder which is a polyol compound having an OH functionality of 3 to 6 and which has at least one polar functional group selected from an ester, carbonate, amide, urethane, urea, thioester or thiocarbonate functionality; ∘ at least one co-binder which is an epoxy resin, ∘ at least one hardener which corresponds to the co-binder and is selected from the group comprising the following substance classes: aliphatic polyamines, cycloaliphatic polyamines, polyetheramines, polymercaptans or polyamidoamines, polycarboxylic acids, polycarboxylic anhydrides; ∘ at least one blocked hardener which is preferably an internally blocked uretdione having an NCO functionality of at least two, ∘ at least one binder which is a polyol compound having an OH functionality of 3 to 6 and which has at least one polar functional group selected from an ester, carbonate, amide, urethane, urea, thioester or thiocarbonate functionality; ∘ at least one co-binder which is an epoxy resin, ∘ at least one hardener which corresponds to the co-binder and is selected from the group comprising the following substance classes: aliphatic polyamines, cycloaliphatic polyamines, polyetheramines, polymercaptans or polyamidoamines, polycarboxylic acids, polycarboxylic anhydrides; b) providing fibres; c) coating the fibres with the reactive composition; d) exposing at least the reactive composition to heat to perform a first crosslinking reaction, in the course of which hardener and binder are converted to a thermoplastic polymer, the fibres being embedded into the thermoplastic polymer; e) obtaining a prepreg comprising the thermoplastic polymer with the fibres embedded therein, characterized in that i) use of a polyol compound or a mixture of a number of polyol compounds as binder, the OH number determined according to DIN 53 240-2 or mean OH number of which is above 300 mg KOH/g, and/or ii) choice of the proportion of corresponding hardener in the reactive composition at greater than 2% by weight, based on the total solids content of the reactive composition.