Low-temperature impact-resistant polyamide-based...

Details Low-temperature impact-resistant polyamide-based... Low-temperature impact-resistant polyamide-based...

2006-03-28

2006-03-28

Boykin, Terressa (Department: 1711)

Stock material or miscellaneous articles

Composite

Of polyamide

C428S195100, C428S212000, C428S500000

Reexamination Certificate

active

07018719

ABSTRACT:
A stretch-oriented multilayer film suited for use as a freeze packaging material, a deep drawing packaging material, a vertical pillow packaging material, etc., is provided as a stretch-oriented multilayer film, comprising at least three layers including a surface layer (a) comprising a thermoplastic resin, an intermediate layer (b) comprising a polyamide resin and a surface layer (c) comprising a sealable resin, said multilayer film exhibiting an impact energy of at least 1.5 Joule at a conversion thickness of 50 μm at −10° C. The multilayer film is produced through an inflation process using water having a large capacity as a cooling and a heating medium and including a combination of a high degree of stretching and a high degree of relaxation heat treatment not exercised heretofore.

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