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

1991-02-07

1993-01-19

Seidleck, James J.

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

Synthetic resins

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

525301, 525308, 525310, 525322, 525324, 524543, 4284761, 4284763, 428626, C08F25504, C08F25506

Patent

active

051807882

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.

REFERENCES:
patent: 4751270 (1988-06-01), Urawa et al.
patent: 4753997 (1988-06-01), Shyu et al.
patent: 4762882 (1988-08-01), Okano et al.
patent: 4908411 (1990-03-01), Kinoshita et al.
patent: 4929682 (1990-05-01), Banzi et al.

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