POLYPROPYLENE PROTECTIVE FILM

PROBLEM TO BE SOLVED: To provide an easily peelable polypropylene protective film reduced in the bleeding of a low-mol.wt. substance, excellent in bonding strength and tear strength and suitable for the protection of the surface of a metal. SOLUTION: A multilayered film has a three-layered structure...

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Bibliographische Detailangaben
Hauptverfasser:	KUGIMIYA YOICHI, AKITAYA SHINICHI, HIROSE TAKETO, HATTORI TAKAYUKI
Format:	Patent
Sprache:	eng
Schlagworte:	CHEMISTRY COMPOSITIONS BASED THEREON COMPOSITIONS OF MACROMOLECULAR COMPOUNDS LAYERED PRODUCTS LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM METALLURGY ORGANIC MACROMOLECULAR COMPOUNDS PERFORMING OPERATIONS THEIR PREPARATION OR CHEMICAL WORKING-UP TRANSPORTING
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide an easily peelable polypropylene protective film reduced in the bleeding of a low-mol.wt. substance, excellent in bonding strength and tear strength and suitable for the protection of the surface of a metal. SOLUTION: A multilayered film has a three-layered structure of (B)/(A)/(B) and each of respective layers comprises a compsn. consisting of a polypropylene homopolymer (PP) and an ethylene/propylene copolymer (RC). Herein, the (A)- layer comprises a compsn. (a) of a crystalline PP and an amorphous RC and is characterized by [η]RC=1.7-2.8 dl/g; [η]RC/[η]PP=0.7-1.2; ([η]RC/[η]PP)×(WPP/ WRC)=1.0-3.0, ethylene content of amorphous RC=25-55 wt.% and 'WRC-A'=22-40 wt.% and the (B)-layer comprises a compsn. (b) satisfying that 'WRC-B' is 0.5