EASY TEARING FILM AND PRODUCTION THEREOF

摘要

PURPOSE:To obtain an easy tearing film free from thickness irregularity and high in surface smoothness and uniformity by subjecting a non-compatible resin compsn. to extrusion molding. CONSTITUTION:A resin compsn. containing a propylene type polymer (A) such as polypropylene and a styrenic polymer (B) such as polystyrene in an A/B wt. ratio of 50/50-98/2 is subjected to extrusion molding. At this time, when the common logarithm value [log (MIA/MIB) of the ratio of the melt index MIA (g/10min) of the propylene type polymer at 230 deg.C under load of 2.16kg and the melt index MIB (g/10min) of the styrenic polymer at 200 deg.C under load of 5kg is X and the shearing speed at a die lip is r (sec<-1>), the resin compsn. is subjected to extrusion molding under conditions such that r is r>=(160-l35X) (1) when S is X>=0 and r is r>=(160--63X) (2) at the time of X<0 without being stretched.