| 摘要 |
<p>The invention relates to an antistatic film having a polypropylene substrate and a polymeric heat-sealable surface layer on which is present an antistatic composition comprising (a) a quaternary ammonium compound, such as choline chloride, (b) an organic polyol containing at least two free hydroxyl groups, such as glycerol, (c) a glyceride of a long chain fatty acid, such as glyceryl monostearate, and, optionally, (d) an ethoxylated amine salt. such as an ethoxylated tallow amine sulphate.</p><p>The composition is conveniently applied directly to the surface of a polymeric extrudate which is subsequently drawn to yield an oriented film, but at least the glyceride may be preblended into the film-forming polymer.</p><p>The invention facilitates the production of uniformly antistatic packaging films despite variations in ambient relative humidity.</p> |
