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 invention relates to curable compositions which are prepared from polyol components containing one or more polyols and isocyanate components containing one or more isocyanates, which compositions contain at least one indicator having at least one quinonoid group, which indicator signifies the degree of curing by a change of color. The invention also relates to a method for indicating the progress of curing in such curable compositions.

Abstract: The invention concerns a method for producing removable surface protection by the application of a curable, liquid coating composition (liquid film), in which the surface is treated using water, or an aqueous solution of surface-active agents, and the coating composition is subsequently applied. Preferably, the surface is the topcoat of a motor vehicle. The invention further relates to the use of water or aqueous solutions of surface-active agents in such a method. Finally, the invention also relates to a removable surface protection coating of this nature. According to the invention, the flow of the coating composition into a uniform film is improved.

Abstract: A molding material based on polyisocyanato-isocyanurates, polyols and flameproofing and fireproofing agents, as well as optionally polyisocyanates, fillers and promoters is described which is preferably in the form of a 2-component material and comprises 5 to 40% by weight of branched polyols, 20 to 40% by weight of the isocyanurate of 1,6-hexamethylene diisocyanate, 0 to 20% by weight of crude MDI and/or prepolymer of polyol and crude MDI and/or isophorone diisocyanate optionally in combination with further isocyanate groups containing compounds, 5 to 20% by weight of a fireproofing mixture mainly consisting of secondary ammonium phosphate, 0 to 50% by weight filler and 0 to 5% by weight promoter. This mass, which permits quick processing at room temperature or slighty increased temperatures, is useful as construction and repair material for many applications, especially in connection with the construction and repair of land, air and water vehicles.

Abstract: A one-component molding material based on polyisocyanato-isocyanurates and flameproofing and fireproofing agents, as well as optionally polyisocyanates, fillers and promoters is described which comprises 40 to 80% by weight of the isocyanurate of 1,6-hexamethylene diisocyanate, 0 to 20% by weight of crude MDI and/or prepolymer of polyol and crude MDI and/or isophorone diisocyanate optinally in combination with further isocyanate groups containing compounds, 5 to 20% by weight of a fireproofing mixture mainly consisting of secondary ammonium phosphate, 0 to 50% by weight filler and 0 to 5% by weight promoter. This low viscosity putty-like mass which is cold-workable and is cured under the influence of moisture, especially at increased temperatures, is useful as construction material for many applications, especially for the manufacture of molded components and plate elements for the construction of land, air and water vehicles.