Patent ID: 8404064
Filing Date: 2013-03-26
Classification: B32B,Y10T

Abstract:
1. Processing steps for laminating a metal substrate with a thin thermoplastic polymer film to create desirable simultaneous commercial properties comprising: a. uncoiling a metal substrate from a coil on a processing line, b. wherein said metal substrate is flat rolled, c. increasing the surface energy of a first major side of said metal substrate to a dyne/cm level of at least 45, d. preheating said metal substrate to at least 200° F., e. preselecting a first film for bonding to said first major side, wherein said first film is either solid or molten, f. pressing said first film onto said first major side by use of a first roll, g. utilizing a first chemical bond for adhering said first film to said first major side thereby creating a metal polymer laminate, h. wherein said first film comprises at least 50% thermoplastic polyester by weight, i. wherein said polyester is PET, PBT, or a mixture of PET and PBT, j. wherein said first film is a maximum of 0.003 inches thick, k. wherein said first film comprises at least one layer, l. post treating said metal polymer laminate by heating said metal polymer laminate to at least the lowest melting point of any polymer in said first film, and m. cooling said metal polymer laminate to below 150° F. for coiling into a finished coil, n. wherein said cooling of said metal polymer laminate creates crystallinity in said first film according to a predetermined criterion, and whereby said finished coil has said desirable simultaneous commercial properties comprising: o. coating continuity of at least three metal thickness bending radius without metal exposure, p. bonding of said first film onto said metal substrate of at least 43 ounces per inch after said cooling, q. a minimum pencil hardness of 2B.