| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain the subject oriented film excellent in processability causing neither planarity aggravation nor shear, 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 (e.g. polylactic acid), being <=30 deg. in the maximum strain of the orientation main axis and <=5% in the thermal shrinkage at 120 deg.C.</p> |
