VERFAHREN ZUR MEHRSTRICHIGEN UMKEHRBESCHICHTUNG MIT POLYURETHANLOESUNGEN

This invention relates to a process for multiple-coat reverse coating using at least two different polyurethane coating solutions, all the coating solutions containing one and the same polar solvent, preferably substantially anhydrous dimethyl formamide. By choosing (A) surface-coat polyurethane sol...

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Bibliographische Detailangaben
Hauptverfasser:	PEDAIN,JOSEF,DR, THOMA,WILHELM,DR, SCHROEER,WALTER,DR
Format:	Patent
Sprache:	ger
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR LAUNDERING MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS TEXTILES THEIR PREPARATION OR CHEMICAL WORKING-UP TREATMENT OF TEXTILES OR THE LIKE WALL, FLOOR OR LIKE COVERING MATERIALS, e.g. LINOLEUM,OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF AFIBROUS WEB COATED WITH A LAYER OF MACROMOLECULARMATERIAL
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Beschreibung
Zusammenfassung:	This invention relates to a process for multiple-coat reverse coating using at least two different polyurethane coating solutions, all the coating solutions containing one and the same polar solvent, preferably substantially anhydrous dimethyl formamide. By choosing (A) surface-coat polyurethane solutions specially made up using high-melting diol chain-extending agents and by using (B) highly concentrated adhesive-coat polyurethane solutions containing at least 40% by weight of polyurethane, it is possible to effectively prevent the so-called "frostwork effect" when applying the adhesive coat to the surface coat (A) by the reverse coating process and the troublesome "overlamination" off the web-form textile during its lamination onto the PU-layers formed by reverse coating. In addition, recovery of the solvent from the coating solutions is simplified.