Graft-modified linear low-density polyethylenes, process for their preparation and the application thereof
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United States of America Patent
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Jan 19, 1993
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N/A
app pub date -
Feb 7, 1991
filing date -
Apr 11, 1987
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Expired
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Abstract
The invention relates to graft-modified linear polyethylene with low density (<940 kg/dm.sup.3) (LLDPE), and in particular with very low density (density <915 kg/dm.sup.3) (VLDPE), grafted particularly with styrene/maleic anhydride. These polyethylenes are very good impact modifiers with a high UV resistance and a high degree of toughness and do not cause discoloration of the polyamides and polyesters modified with them. They can be prepared in a simple and economically efficient manner with a high degree of conversion. These polyethylenes are also highly suited as impact modifiers, adhesives or adhesive layers, heat-seal layers, bonding layers in composite films, compatibility enhancement agents as well as bonding promotors, or as components of such agents or layers. Graft-modified polyethylene can be prepared by converting a linear low-density polyethylene with the grafting material at at temperature higher than 110.degree. C. under the influence of shearing forces using radical catalysts and optionally anti-oxidants, in which process the grafting material may be used in the presence of a solvent.
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