Patent ID: 8119752

Claim:
An ethylene copolymer prepared by reacting ethylene and at least one comonomer via free-radical copolymerization in a cascade comprising a first reactor and at least one additional reactor, wherein said reactors include a high-pressure autoclave and a tube reactor and wherein at least one initiator is fed into the reaction mixture downstream from said first reactor; wherein said ethylene copolymer has an MFI in the range of from 0.2 to 50 g/10 min, measured in accordance with DIN 53753, at a temperature of 190° C. under a load of 2.16 kg; and wherein said ethylene copolymer was copolymerized from (a) 50 to 75% by weight of ethylene; (b1) 2 to 10% by weight of (meth)acrylic acid; (b2) 0.1 to 2% by weight of maleic acid or maleic anhydride; and (c) 15 to 40% by weight of n-butyl (meth)acrylate.