Alkali-soluble protective-film coated stainless steel sheet

Details Alkali-soluble protective-film coated stainless steel sheet Alkali-soluble protective-film coated stainless steel sheet

B - Operations, Transporting

32

B

B32B 15/08 (2006.01) B05D 7/00 (2006.01) B05D 7/14 (2006.01) B32B 27/30 (2006.01)

Patent

CA 2236006

A stainless steel sheet having a protective coat for protecting the surface of the sheet in press working on the surface, wherein the protective coat is composed of a lower coating made from an epoxy-modified acrylic resin prepared by modifying an acrylic resin having an acid value of 40 to 300 and a glass transition temperature of 0 to 20 ~C with 3 to 20 % by mass of an epoxy oligomer having a molecular weight of 500 to 2000 and an upper coating made from an acrylic resin having an acid value of 40 to 300 and a glass transition temperature of 40 to 80 ~C, these coatings being formed on the surface of the sheet successively in a total thickness of 1 to 20 µ.

L'invention porte sur une tôle d'acier inox revêtue d'un revêtement protecteur alcalino-soluble en protégeant la surface devant être soumise à un usinage à la presse. Ledit revêtement protecteur comprend une couche inférieure de résine acrylique modifiée à l'époxyde présentant un indice d'acidité compris entre 40 et 300 et une température de transition vitreuse comprise entre 40 et 20 ·C, et comportant de 3 à 20 % en masse d'un oligomère époxyde d'un poids moléculaire compris entre 40 et 300 et d'une température de transition vitreuse comprise entre 40 et 80 ·C. Ces revêtements sont formés de couches successives déposées à la surface de la tôle et dont l'épaisseur total peut atteindre entre 1 et 20 µm.

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