Graft-modified linear low-density polyethylenes, process for the

Details Graft-modified linear low-density polyethylenes, process for the Graft-modified linear low-density polyethylenes, process for the

1989-10-05

1991-06-04

Bleutge, John C.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Mixing of two or more solid polymers; mixing of solid...

4284761, 4284763, 428626, 525 78, 525 66, 525 67, 525 64, 524543, C08F25502, C08L 6700, C08L 5900, B32B 2708

Patent

active

050215108

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 discolouration 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 a 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.

REFERENCES:
patent: 4440911 (1984-04-01), Inoue et al.
patent: 4762882 (1988-08-01), Okano et al.

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