| 摘要 |
<p>Polymer compositions are provided which may be cast as thin, self-supporting films, useful in forming sealed envelopes or pouches containing granulated pulverulent or non-aqueous liquid materials. The cast films comprise a polymeric matrix, having at least about 50 weight percent polyvinyl alcohol, and a plurality of microdomains dispersed throughout the polymeric matrix. The films have good resistance to breakage at low temperatures and low relative humidities.</p> |
