| 摘要 |
<p>Grafted linear polyethylenes of low density (<940 kg/dm<3>) (LLDPE) and, in particular, having very low density (</=910 kg/dm<3>) (VLDPE) and having ultralow density (</=900 kg/dm<3>) (ULDPE) and grafted, in particular, with styrene/maleic anhydride are very good impact modifiers which are highly UV resistant and have high toughness and do not cause any discoloration of the polyamides and polyesters modified using them. They are simple and economical to prepare in high conversions. …<??>These polyethylenes are also highly suitable as impact modifiers, adhesives or adhesive coatings, heat-sealing layers, adhesive layers in multilayer films or sheeting, compatibility-increasing agents and adhesion improvers or as components of agents or layers of this type. …<??>Grafted polyethylenes can be prepared by reacting a low-density polyethylene with the graft material at a temperature above 110 DEG C under the action of shear forces using free-radical catalysts and optionally antioxidants, the graft material optionally being employed in the presence of a solvent.</p> |
