Coextrusionsbindemittel, seine Verwendung für Mehrschichtstrukturen und Mehrschichtstrukturen daraus hergestellt

摘要

A coextrusion binder comprises: (i) at least one polymer (A) containing at least 75 mol.% ethylene with a ratio Ml2/Ä eta Ü<-8.77> having absolute value greater than 15; (ii) at least one polymer (B) selected from polymers (B1) containing at least 50 mol.% ethylene, block copolymers of styrene (B2), (B) having a ratio Ml2/Ä eta Ü<-8.77> having absolute value greater than 15; (iii) a mixture of (A) and (B) grafted by unsaturated carboxylic acid or one of its functional derivatives; and (iv) a co-grafted mixture eventually diluted by polymer (C) selected from (C1) homo- or copolymers of ethylene, and (C2) block copolymers of styrene. The binder contains at least 70 mol.% ethylene and 0.1-10 wt.% carboxylic acid or derivative; and it has a ratio Ml10:Ml2 = 5-20. Ml10 = flow index at 190 degrees C under charge of 10 kg and Ml2 = flow index at 190 degrees C under charge of 2.16 kg. eta = viscosity of polymer measured in solution of decalin at 135 degrees C. Also claimed are, a structure produced using the above binder; and a rigid hollow body comprising the structure.