Patent ID: 6099924
Filing Date: 2000-08-08
Classification: B32B,B65D,Y10T

Abstract:
A laminate obtained by laminating a resin comprising a polyester a metal base material, said resin layer having(a) a melt viscosity ratio (R) defined by the following formula (1), ##EQU3## wherein .eta..sub.12.2 is a melt viscosity at an extrusion temperature of the polyester at a shearing rate of 12.2 sec.sup.-1, and .eta..sub.1216 is a melt viscosity at an extrusion temperature of the polyester at a shearing rate of 1216 sec.sup.-1,of not smaller than 2.0 at a melt extrusion temperature of the polyester,(b) .eta..sub.1216 of 500 to 4000 poises, and(c) a melt tension of larger than 0.2 and not larger than 1.5 grams at a temperature during the melt extrusion and said resin layer being further quickly quenched after it is melt-extruded,wherein said polyester comprises (1) terephthalic acid with (2) ethylene glycol or 1,4-butanediol, and has a melting point (Tm) of 160 to 270.degree. C., andthe difference between the density (.rho.) of the polyester layer of the laminate after extrusion and the amorphous density (.rho.a) is not larger than 0.05.