Preparation of carboxyl-containing copolymers of ethylene
AssigneeBASF SE
InventorsAndreas Deckers, Ruger Schlund, Roger Klimesch
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Abstract
Carboxyl-containing copolymers of ethylene are prepared by polymer-analogous pyrolytic ester cleavage of copolymers consisting of a) from 60 to 99.9 mol% of ethylene, b) from 0.1 to 40 mol% of C.sub.4 -C.sub.8 -tert-alkyl esters of copolymerizable C.sub.3 -C.sub.12 -carboxylic acids and c) from 0 to 20 mol% of further copolymerizable monomers by a method in which pyrolytic ester cleavage is carried out at from 150.degree. to 250.degree. C. in the presence of organic sulfonic acids, in the absence of a solvent and in the virtual absence of free radical initiators.
Claims4
A process for the preparation of carboxyl-containing copolymers of ethylene by polymer-analogous pyrolytic ester cleavage of copolymers consisting of
- a) from 60 to 99.9 mol% of ethylene,
- b) from 0.1 to 40 mol% of C.sub.4 -C.sub.8 -tert-alkyl esters of copolymerizable C.sub.3 -C.sub.12 -carboxylic acids and
- c) from 0 to 20 mol% of further copolymerizable monomers,
- wherein the pyrolytic ester cleavage is carried out at from 150.degree. to 250.degree. C. in the presence of organic sulfonic acids, in the absence of a solvent and in the virtual absence of free radical initiators.
Dependencies are inferred from the claim text.