Alkali-soluble-film surface-lubricated metal product...

B - Operations – Transporting – 32 – B

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B32B 15/08 (2006.01) B05D 7/14 (2006.01) C08G 18/08 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08G 18/66 (2006.01) C08G 18/75 (2006.01) C08G 18/76 (2006.01) C09D 175/04 (2006.01) C10M 107/44 (2006.01) C23C 22/00 (2006.01)

Patent

CA 2442748

In order to provide an alkali-soluble-film surface--lubricated metal product excellent in moldability and long-term stable film-removability independent of the film drying temperature, an alkali-soluble lubricating film mainly comprising an alkali-soluble polyurethane aqueous composition containing a polyether polyol as a skeleton and also containing a carboxyl group within the molecule, and a lubricating function-imparting agent in an amount of 1 to 30 mass% based on the alkali-soluble polyurethane aqueous composition is coated on both surfaces or one surface of a metal to have a film thickness of 0.5 to 10 µm, thereby constituting an alkali-soluble-film surface-lubricated metal product excellent in moldability and long-term stable film--removability independent of the film drying temperature, wherein the elastic modulus of the film after coating is from 0.5 to 20 GPa at 25°C.

La présente invention concerne un produit métallique enduit d'une pellicule lubrifiante alcalino-soluble, caractérisé en ce que l'une au moins des faces du produit est enduite d'une pellicule lubrifiante alcalino-soluble à base essentiellement d'une composition aqueuse contenant, d'une part un polyurétane alcalino-soluble dont l'ossature est un polyol de polyéther, et d'autre part un groupe carbonyle dans la molécule-même, et enfin un lubrifiant pour 1 à 30% de la masse de la composition aqueuse renfermant le polyurétane alcalino-soluble, la pellicule représentant une épaisseur de 0,5 à 10 ?m pour un coefficient d'élasticité après enduction de 0,5 GPa à 25·C. Ce produit métallique, qui se prête particulièrement au formage et au dépelliculage, est stable à long terme, et peu sensible à la température de séchage de la pellicule.

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