MULTILAYER FILM AND HEAT-RESISTANT ADHESIVE TAPE

• Main Authors: FUJIWARA, Junpei, IWASAKI, Takayuki, HIROKAW, Yasushi
• Format: Patent
• Language: English; French; German
• Published: 12.02.2020
• Subjects: ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; ADHESIVES; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; DYES; INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULARARTICLES; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; PAINTS; PERFORMING OPERATIONS; POLISHES; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; USE OF MATERIALS AS ADHESIVES; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

[Problem] The present invention is to provide: a film which is excellent in film moldability, is also excellent in heat resistance and transparency, and has a small shrinkage factor and a small heating weight loss ratio even under a high-temperature atmosphere; and a heat-resistant adhesive tape comprising the same.[Solution] A multilayer film having alternately laminated therein one or more layers of each of a substrate layer (A) comprising a sulfone-based resin having a glass transition temperature of 200°C or more and an adhesive layer (B) comprising a thermoplastic resin having a glass transition temperature of 190°C or more, and a multilayer film excellent in film moldability, heat resistance, and transparency is obtained due to at least one outermost layer of the multilayer film comprising the adhesive layer (B) and the arithmetic mean surface roughness Ra of a surface of at least one outermost layer of the multilayer film being greater than 0.1 µm and less than 10.0 µm.