Patent ID: 8133542
Filing Date: 2012-03-13
Classification: B32B,B65D,Y10T

Abstract:
1. A method for making a resin-coated metal plate for a drawn can, said method comprising the steps of: step (a) applying a layer [A] and a layer [B] either together or separately on at least one surface of a metal plate to form a resin-coated metal plate, so that the layer [B] is laminated on the metal plate to form a tight contact with the metal plate, in which the layer [A] and the layer [B] are substantially unoriented and uncrystallized before heating of step (b), wherein the layer [A] is a saturated polyester resin produced from dicarboxylic acid and dihydroxy compounds, in which the components of dicarboxylic acid are terephthalic acid and isophthalic acid, or only terephthalic acid, and the layer [B] comprises a saturated polyester resin and an ionomer resin; and step (b) heating the resin-coated metal plate while the resin-coated metal plate is held with a wicket to form a highly crystallized layer (X) on a surface of the layer [A], so that the highly crystallized layer (X) is resistant to corrosion, to thereby form the resin-coated metal plate for a drawn can, wherein the ratio of the thickness of the layer [A] to the layer [B] is in range of 2:1 to 1:9, wherein the heating of step (b) is performed at a temperature of 150 to 200° C. for 1 to 30 minutes, wherein the highly crystallized layer (X) has a degree of crystallization that is 10-60%, and wherein the highly crystallized layer (X) is at least 2% of thickness of the layer [A].