BIAXIALLY ORIENTED SELF-TACK PROTECTIVE FILM FOR IN-MOLD LAMINATION

• Main Authors: SHIRAISHI YASUHIRO, FUKUDA KAZUNORI, KANBE KEIICHI, YAJIMA SHINICHIRO
• Format: Patent
• Language: English
• Published: 30.06.2011
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; 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; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

PROBLEM TO BE SOLVED: To provide a biaxially oriented self-tack protective film for in-mold lamination which shows excellent transparency and appearance property without the generation of interface irregularities or interlayer void, and also without the generation of floating or peeling to an adherend during high temperature fabrication, and for these advantages, enables an easy visual product inspection of the adherend, and exhibits an insignificant tack acceleration under high temperatures. SOLUTION: This biaxially oriented self-tack protective film for in-mold lamination is an at least three-layer laminated film constituted of a self-tack layer (X)/an intermediate layer (Y)/a non-tack layer (Z) formed in that order. (1) The intermediate layer (Y) is composed of 30-100 wt.% of propylene-based resin composition (A) made up of 60 to 70 wt.% of propylene/ethylene random copolymer component (a1) including the range of 98 to 99.9 wt.% of propylene unit in terms of weight reference of compolmer, and 30 to 40 wt.% of propylene/α-olefin random copolymer component (a2) including the range of 70 to 80 wt.% of propylene unit in terms of weight reference of the copolymer; and 0 to 70 wt.% of propylene homopolymer (B). (2) The self-tack layer (X) is composed of 55 to 70 wt.% of hydrogenated-stylene-based elastomer (C) and 30 to 45 wt.% of propylene homopolymer (D). (3) The non-tack layer (Z) is composed of a polymer composition obtained by blending 0.5 to 1.5 pts.wt. of a film anti-blocking agent (F) to 100 pts.wt. of propylene/α-olefin random copolymer (E). Thus, the biaxially oriented self-tack protective film for in-mold lamination is characterized in that the conditions have to be satisfied. COPYRIGHT: (C)2011,JPO&INPIT