Ionically crosslinked ethylene copolymers twin screw extruder able by bond a carboxyl-containing copolymer with an aqueous metal alkali band-aid in the acknowledgment area of a individual spiral extruder and appointment the artefact to a devolatilization zone, and are acclimated as adherence promoters, bang molded online writing or laminating films.

The present area assembly extruder relates to a action for the alertness of ionically crosslinked ethylene copolymers by bond an ethylene copolymer which contains, as copolymerized units, from 0.1 to 20 mol % of ,-ethylenically unsaturated carboxylic acids or ,-ethylenically unsaturated comonomers altruistic carboxyl groups with a water-soluble metal alkali at aloft the melting point of the ethylene copolymer in a twin- spiral extruder.

Processes of this blazon accord twin screw extruder with carboxyl-containing monomers, some of the carboxyl groups getting present in chargeless anatomy while the butt are affirmed to metal cations, so that a assertive amount of crosslinking is achieved.

Processes for modifying carboxyl-containing ethylene copolymers are declared in, for example, U.S. Pat. Nos. 3,264,272 and 3,969,434 and British Patent 1,475,336. The alertness is agitated out in elastic mills, two-roll mills and twin screw extruder accepting a length/diameter arrangement of 21 or in a single- spiral extruder as declared in, for example, U.S. Pat.

An affected action for the alertness of ionically crosslinked ethylene copolymers accepting bigger artefact accord is declared in EP-A-01 93 110. There, however, distinctively advised devolatilization orifices are appropriate in adjustment to anticipate the artefact from getting affected out of the devolatilization breach and getting fatigued in afresh in an amoral manner, consistent in the accumulation of specks.

It is an article of the present accompanying spiral extruder to accommodate a action for ionic crosslinking of ethylene copolymers in an extruder, in which, on the one hand, articles accepting acceptable accord are acquired and, on the added hand, able devolatilization of the product, decidedly at top polymer throughputs, is ensured individual spiral extruder.