Production of skins from polyurethane dispersions

Details Production of skins from polyurethane dispersions Production of skins from polyurethane dispersions

B - Operations, Transporting

29

C

B29C 41/08 (2006.01) B29C 41/22 (2006.01) B29C 41/32 (2006.01) B29C 44/14 (2006.01) C08G 18/08 (2006.01)

Patent

CA 2262075

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.

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