PRECOATED METAL SHEET EXCELLENT IN PROCESSED PART CORROSION RESISTANCE AND METAL PART USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a precoated metal sheet excellent in the outdoor corrosion resistance of a draw processing part.;SOLUTION: The precoated metal sheet has at least one layer comprising a coating film, which has a flow region in a viscoelasticity curve showing a relation between the logarithm of storage elastic modulus (E') and a temprature (T) and is characterized in that the minimum inclination of [log E'/T] in the flow region is -0.02 Pa/°C or below, on one side or both sides thereof. A main resin constituting the coating film is a polyester resin obtained from an acid component containing 70 mol % or above of an aromatic dicarboxylic acid and a polyol component containing 70 mol % or above of one of or both of ethylene glycol and propylene glycol and has a number average molecular weight of 10,000-30,000 and a hydroxyl number of 1-10 mg/KOH.;COPYRIGHT: (C)2004,JPO&NCIPI