Easy-open end
An easy-open end comprising a resin-coated metal plate obtained by coating a metal substrate with a anti-blocking agent-containing biaxially drawn film via a primer, wherein an important feature resides in that the anti-blocking agent in the biaxially drawn film is of a spherical shape having an average particle size of 0.5 to 2.5 μm and an average particle size ratio (long diameter/short diameter) in a range of 1.0 to 1.2, and is contained at a ratio of 0.05 to 0.5% by weight in the biaxially drawn film. Even without forming a top-coat layer, therefore, the film is not scratched or the forming-tool is not damaged by the anti-blocking agent that adheres and deposits on the forming tool. Besides, the resin coating favorably adheres to the metal plate offering excellent advantage in production and in economy.
1. An easy-open end comprising a resin-coated metal plate obtained by coating a metal substrate with an anti-blocking agent-containing biaxially drawn film via a primer, wherein:
the anti-blocking agent is of a spherical shape having an average particle size of 0.5 to 2.5 μm and an average particle size ratio (long diameter/short diameter) in a range of 1.0 to 1.2, and is contained at a ratio of 0.05 to 0.5% by weight in the biaxially drawn film, and no top-coat layer is formed on the biaxially drawn film, and
the primer is the one obtained by blending a single-terminal-modified epoxy resin having a number average molecular weight in a range of 3,000 to 8,000, the epoxy resin being modified with phenols or bisphenol, and an alkali resole-type phenol resin at a ratio (weight ratio) of 95:5 to 50:50.
2. The easy-open end according to claim 1 , wherein said biaxially drawn film is any one of a polyethylene terephthalate, isophthalic acid-copolymerized polyethylene terephthalate, naphthalenedicarboxylic acid-copolymerized polyethylene terephthalate, or a blend of polyethylene terephthalate/polybutylene terephthalate.
3. The easy-open end according to claim 1 , wherein said primer has a thickness of 0.3 to 3 μm.
4. The easy-open end according to claim 1 , wherein said biaxially drawn film has a thickness of 10 to 40 μm.