Resin-coated metal sheet for can ends

Abstract

The resin-coated metal plate for the can end is thermally fused with a thermoplastic resin film (A) mainly composed of PBT and PET on the surface of the metal plate (1) which becomes the outer surface side of the can end, and on the surface which becomes the inner surface side of the can end. The thermoplastic resin film (B) mainly composed of PET is formed by thermal fusion, and the composition ratio (wt %) of PBT / PET of the thermoplastic resin film (A) is (40 / 60)~(80 / 20). The ratio of the Raman band intensity I0 of 1615 ± 10 cm-1 on the polarization plane horizontal to the surface to the Raman band intensity I90 of 1615 ± 10 cm-1 on the polarization plane perpendicular to the surface is 0.60 or more, and the thermoplastic resin film ( B) PET is 95 mol% or more, the thermoplastic resin film (B) has a melting point derived from PET of 250° C. to 265° C. and is 25° C. or more higher than the melting point of the thermoplastic resin film (A) derived from PBT. The half-maximum width of the Raman band at 1730±10cm-1 on the polarization plane is 15-20cm-1.

Description

technical field [0001] The present invention relates to a resin-coated metal plate for can lids mainly used for lids of food cans. Background technique [0002] Conventionally, solvent-based coatings mainly composed of thermosetting resins have been coated on the inner and outer surfaces of metal beverage cans and food cans. Its purpose is to maintain the flavor of the contents, prevent metal corrosion as the material of beverage cans and food cans, improve the design of the outer surface of beverage cans and food cans, protect the printed surface, etc. However, solvent-based paints require heating at high temperatures in order to form a coating film, and since a large amount of solvent is generated during heating, there are problems in terms of work safety and influence on the environment. Therefore, recently, as a corrosion prevention method not using a solvent, coating of a metal with a thermoplastic resin has been proposed. In particular, among thermoplastic resins, po...

AI Technical Summary

Problems solved by technology

However, when the high-melting-point side film is laminated at high temperature, not only the interface between the low-melting-point side film and the metal plate, but also the entire layer of the low-melting-point side film melts, and sometimes the low-melting-point side film adheres to the bonding film. Defective condition of the roller (welding)

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