PRODUCTION OF SKINS FROM POLYURETHANE DISPERSIONS

A process for producing skins from polyurethane dispersions comprises I. producing on a mold a sheetlike layer of an aqueous dispersion comprising a polyurethane (A), the mold surface being free of any electrolyte which would cause the aqueous dispersion comprising a polyurethane (A) to coagulate, I...

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Bibliographische Detailangaben
Hauptverfasser:	BARTZ, THOMAS, TINTELNOT, DIETER, HITSCHFELD, KLAUS, FREI, HANS-PETER
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING CHEMISTRY COMPOSITIONS BASED THEREON INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONSONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR SHAPING OR JOINING OF PLASTICS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING WORKING OF PLASTICS WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
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Beschreibung
Zusammenfassung:	A process for producing skins from polyurethane dispersions comprises I. producing on a mold a sheetlike layer of an aqueous dispersion comprising a polyurethane (A), the mold surface being free of any electrolyte which would cause the aqueous dispersion comprising a polyurethane (A) to coagulate, II. drying the film, produced in step (I), of the aqueous dispersion comprising a polyurethane (A) to obtain a single-layered skin, III. optionally producing a skin composed of a plurality of skin layers by producing on the mold, obtained in step II, coated with a single-layered skin a further sheetlike layer of an aqueous dispersion comprising a polyurethane (A), IV. drying the new film, formed in step (III), of the aqueous dispersion comprising a polyurethane (A) to form a further skin layer, and V. optionally repeating steps (III) and (IV) from 5 to 50 times.