Patent ID: 8268422
Filing Date: 2012-09-18
Classification: B32B,B65D,Y10T

Abstract:
1. A seamless can, comprising seamless walls consisting of a can bottom connected to a seamless can barrel having an upper can barrel portion at the upper portion of said can barrel and a lower can barrel portion below said upper can barrel portion, said walls of the can being formed of a metal sheet having a layer of resin on the side thereof that is on the inside of the can, wherein said resin layer comprises a surface layer (A) formed of polyethylene terephthalate/isophthalate containing less than or equal to 15 mol % of isophthalic acid, and a lower layer (B) formed of polyethylene terephthalate/isophthalate containing 8 to 25 mol % of isophthalic acid, wherein the wall thickness at said can barrel is 20-85% of the wall thickness of the can bottom, wherein the resin layer has a density of greater than or equal to 1.36 g/cm 3 at the upper can barrel portion and a density of less than or equal to 1.36 g/cm 3 at the can bottom, with the density of the resin layer at the upper can barrel portion being greater than the density of the resin layer at the can bottom, and wherein the resin layer of the can barrel comprises molecules that are oriented at least in a uniaxial direction, while the resin layer of the can bottom comprises molecules that are not oriented.