| 摘要 |
<p>A degradable mulching film comprises a transparent film of a polyolefine having on its undersurface an adherent opaque coating. The transparent film may be of a homo-, co- or blended polymer of ethylene, propylene, butene-1, pentene-1, 3-methyl butene-1 or 4-methyl pentene-1. It may have a thickness of 0.3-5 mils. It may contain an additive to promote degradation, e.g. rosin or polyterpene or coumarone-indene resin. The opaque coating material may be a black ink comprising a polyamide or a polyolefine. It may have a thickness of 0.005-1 mil.</p> |
