| 摘要 |
Films consisting essentially of alpha-olefin polymers, such as normally solid polypropylene consisting essentially of recurring propylene units and having a substantial crystalline polypropylene content, and in particular isotactic polypropylene, are coated with a ketonic resin resulting from the polycondensation of aldehydes with ketones, which coating renders the films readily thermoweldable and/or impervious to gases, vapors and the like. The coated films are useful for the manufacture of containers, covers, small bags, vessels and in general for the manufacture of articles useful in the packaging industry.
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