Description Multilayer Resin Films, Resin-Coated Metal Plates, a Method of Producing Multilayer Resin Films and a Method of Producing Resin-Coated Metal Plates
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United States of America Patent
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Issued Date -
Mar 27, 2008
app pub date -
Aug 6, 2004
filing date -
Aug 6, 2004
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
Provided are a multilayer film with small surface unevenness, constructed from resin layers with different molten viscosities: a resin-coated metal plastic, formed by layering a multilayer resin film on a metal plate: a method reproducing a multilayer resin film by layering molten resins with different molten viscosities without forming unevenness on the surface of the film; and a method of producing a resin-coated metal plate. The difference in molten viscosities or adjacent resin layers is set to 3000 poise or lower at a shear rate of 20 to 500 s.sup.-1, with the temperature of an extruder, a manifold, and that part of a die which is adjacent to the manifold through which of these a resin with a high molten viscosity passes maintained higher than the temperature of an extruder, a manifold, and that part or a die which is adjacent to the manifold through which of these a resin with a low molten viscosity passes. After that, the individual molten resins are layered on each other to form a multilayer film such that the thickness of a resin whose molten tensile force is 1 g or greater is one third or more of the total thickness.
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