Abstract: A textile web material impregnated with a mixture that contains at least a prepolymer prepolymerized from a starting material of one or more bifunctional or polyfunctional organic cyanates and from a starting material of one or more bifunctional or polyfunctional aromatic alcohols, wherein the one or more bifunctional or polyfunctional organic cyanates and the one or more bifunctional or polyfunctional aromatic alcohols are present in weight ratios ensuring a molar ratio of the OCN groups to the OH groups between 95:5 and 70:30 prior to prepolymerization. The mixture further contains one or more fillers.

Abstract: The use of a substrate supported polymer film as a surface coating for fiber/plastics composite structures produced by the crushed core method from composite structures having a core and at least one prepreg layer, wherein the polymer film is applied to a prepreg surface with its resin side facing the surface before the composite structure is cured and optionally before it is placed in the mold, and curing is effected under applied pressure and at an elevated temperature. The substrate supported polymer film comprises a resin matrix which has a degree of crosslinking that is below its gel point, and which is produced from at least one difunctional or polyfunctional aromatic organic cyanate and at least one difunctional or polyfunctional aromatic alcohol in proportions giving a molar ratio of OCN groups to OH groups in the starting materials used for the production of the prepolymer of from 95:5 to 70:30, and which also contains at least one filler.

Abstract: The use of a substrate supported polymer film as a surface coating for fiber/plastics composite structures produced by the crushed core method from composite structures having a core and at least one prepreg layer, wherein the polymer film is applied to a prepreg surface with its resin side facing the surface before the composite structure is cured and optionally before it is placed in the mold, and curing is effected under applied pressure and at an elevated temperature. The substrate supported polymer film comprises a resin matrix which has a degree of crosslinking that is below its gel point, and which is produced from at least one difunctional or polyfunctional aromatic organic cyanate and at least one difunctional or polyfunctional aromatic alcohol in proportions giving a molar ratio of OCN groups to OH groups in the starting materials used for the production of the prepolymer of from 95:5 to 70:30, and which also contains at least one filler.

Abstract: A prepolymer is prepared from a starting material a) of one or more bifunctional or polyfunctional organic cyanates; and a starting material b) of one or more bifunctional or polyfunctional aromatic alcohols and/or one or more bifunctional or polyfunctional aliphatic alcohols substituted in the aliphatic group with at least one fluorine atom, wherein the starting materials a) and b) are present in a weight ratio ensuring a molar ratio of the OCN groups to the OH groups between 95:5 and 70:30 in the starting materials a) and b). The prepolymer has a degree of crosslinking that is below the gel point of the prepolymer.

Abstract: A textile web material impregnated with a mixture that contains at least a prepolymer prepolymerized from a starting material of one or more bifunctional or polyfunctional organic cyanates and from a starting material of one or more bifunctional or polyfunctional aromatic alcohols, wherein the one or more bifunctional or polyfunctional organic cyanates and the one or more bifunctional or polyfunctional aromatic alcohols are present in weight ratios ensuring a molar ratio of the OCN groups to the OH groups between 95:5 and 70:30 prior to prepolymerization. The mixture further contains one or more fillers.