| 摘要 |
PROBLEM TO BE SOLVED: To obtain the subject film excellent in processability causing neither planarity aggravation nor shear in printing, etc., during printing and laminating processes, related to the important characteristics in wrapping films and adhesive tapes for perishables, processed foods, medicaments, medical equipment, electronic parts, etc., and excellent in hand tearability and twistability as well. SOLUTION: This film consists of a polymer predominant in an aliphatic polyester which is composed mainly of recurring unit of the general formula O-CHR-CO (R is H or a 1-3C alkyl) and has a reduced viscosity (ηsp/C) of 0.50-2.50 dL/g, being characterized by being 1.440-1.455 in the refractive index in the thickness direction (Nz), <=0.2% in the variance in the Nz in the longitudinal direction, and <=5% in thermal shrinkage at 120 deg.C.
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