PROTECTIVE FILM

• Main Authors: ISHIGURO SHIGEKI, YOSHIE SATOMI, SENDA HIROKI, SEKIGUCHI YUKA, HAYASHIUCHI RIE, ENDO ASUKA
• Format: Patent
• Language: Chinese; English
• Published: 05.11.2014
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F,C08G; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; DYES; GENERAL PROCESSES OF COMPOUNDING; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PERFORMING OPERATIONS; POLISHES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; WORKING-UP

Provided is a protective film which has a polylactic acid-based film or sheet as the substrate. The protective film has such a tear strength as not to break or tear even in manufacturing or processing the protective film or in winding the protective film into a roll. Further, the protective film does not suffer from the melting or deformation of the substrate even at a high temperature exceeding 100 DEG C. The protective film has a removable pressure-sensitive adhesive layer on at least one surface of a substrate, wherein the substrate is composed of a polylactic acid-based film or sheet that contains a polylactic acid (A). The polylactic acid-based film or sheet exhibits a tear strength of 100N/mm or more when torn at least in the machine direction (MD). Further, the dimensional changes of the film or sheet in the machine direction (MD) and the transverse direction (TD) after heating are within the range of +/-3%, while the dimensional change thereof in the machine direction (MD) after heating under load is