Dow Global Technolgoies LLC

Lutz Haeussler

Inno Rapthel

Bianka Leitner

Jochen Gerecke

Klaus Besser

Procedure for the manufacture of carboxylated ethylene polymer blends, in which in a 1step, in a fluid mixing reactor, to 100 pbw of a particulate ethylene polymer&#x2014;chosen from among ethylene homopolymers (HDPE, LDPE) and/or linear ethylene copolymers with 2 to &#x2266;20 wt.-% polymerized-in C-olefin units (LLDPE, EOP), with a melt-flow rate MFR (190&#xb0; C./2.16 kg)&#x2267;20 g/10 min&#x2014;are added 0.05-15 pbw of a &#x3b1;,&#x3b2;-ethylenically unsaturated mono and/or dicarboxylic acid or its anhydride (carboxyl monomer), or a monomer mixture containing at least one carboxyl monomer and 0.01-10 pbw of a radical initiator or initiator mixture, and graft-polymerizing at reaction temperatures of 30-120&#xb0; C., over a reaction time of 5-120 min and subsequently, in a 2step, reacting a mixture continuously fed into a reaction extruder of 100 pbw of the modified ethylene polymer obtained in the 1solid phase step, 150-4,000 pbw of an ethylene polymer or polymer blend with a melt flow rate MFR (190&#xb0; C., 2.16 kg)&#x3c;20 g/10 min, as well as 0-4,000 pbw of an olefinic elastomer, at temperatures of 160-260&#xb0; C. and continuously removing the graft-modified ethylene polymer blend that has a degree of carboxylation of 0.05-1 wt.-%. The products obtained are especially suitable as adhesion promoters and/or adhesives for numerous substrates, preferably on and between metallic surfaces.

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Halle/Saale, Germany

Lutz Haeussler