| 摘要 |
<p>The packaging material comprises a paper substrate 1, a sealant layer 2 applied to the paper 1 and a barrier layer 3. The barrier layer 3 is preferably an oxygen or water vapour barrier, and it comprises a water soluble polymer containing inorganic particles. The water soluble polymer is polyvinyl alcohol (PVA) and/or the particles are clay. The preferred sealant layer 2 comprises polysaccharide (e.g. starch, carboxy-methyl cellulose (CMC), or chitosan), polyvinyl alcohol (PVOH), polyethylene vinyl alcohol (EVOH), polyester, (e.g. polylactic acid (PLA)), acrylic polymer (e.g. acrylonitrile butadiene styrene copolymer (ABS)), polyolefin or polyamide, and a crosslinking agent.</p> |
