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1. (WO1998052742) IMPROVED COMPOSITION FOR UNIAXIALLY HEAT-SHRINKABLE BIAXIALLY ORIENTED POLYPROPYLENE FILM
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/052742 International Application No.: PCT/US1998/009675
Publication Date: 26.11.1998 International Filing Date: 07.05.1998
Chapter 2 Demand Filed: 17.09.1998
IPC:
B29C 55/02 (2006.01) ,B32B 27/32 (2006.01)
B PERFORMING OPERATIONS; TRANSPORTING
29
WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
C
SHAPING OR JOINING OF PLASTICS; SHAPING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL; AFTER- TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
55
Shaping by stretching, e.g. drawing through a die; Apparatus therefor
02
of plates or sheets
B PERFORMING OPERATIONS; TRANSPORTING
32
LAYERED PRODUCTS
B
LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
27
Layered products essentially comprising synthetic resin
32
comprising polyolefins
Applicants:
MOBIL OIL CORPORATION [US/US]; 3225 Gallows Road Fairfax, VA 22037, US
Inventors:
AMON, Moris; US
PEET, Robert, Guthrie; US
PELLINGRA, Salvatore, James, Jr.; US
Agent:
CUOMO, Lori, F. ; Mobil Oil Corporation 3225 Gallows Road Fairfax, VA 22037, US
Priority Data:
08/858,85019.05.1997US
Title (EN) IMPROVED COMPOSITION FOR UNIAXIALLY HEAT-SHRINKABLE BIAXIALLY ORIENTED POLYPROPYLENE FILM
(FR) COMPOSITION AMELIOREE POUR PELLICULE DE POLYPROPYLENE ORIENTE BIAXIALEMENT ET THERMORETRACTABLE UNIAXIALEMENT
Abstract:
(EN) A uniaxially heat-shrinkable, biaxially oriented, multilayer film having a polypropylene-containing core layer comprising at least 70 wt.% of said multilayer film and optionally, at least one polyolefin-containing skin layer adjacent said core layer, is prepared by biaxially orienting a coextrudate and thereafter orienting said coextrudate by stretching 10 to 40 % in the machine direction. The core layer contains isotactic polypropylene and a sufficient amount of syndiotactic polypropylene to inhibit uniaxial heat shrinkage at temperatures below 50 °C. The skin layer can be selected from the group consisting of polypropylene, ethylene-propylene copolymer, polyethylene, and ethylene-propylene-butylene terpolymer.
(FR) L'invention concerne une pellicule multicouche orientée biaxialement et thermorétractable uniaxialement, qui comprend une couche centrale à base de polypropylène contenant au moins 70 % en poids de ladite pellicule multicouche et, éventuellement, au moins une couche superficielle à base de polyoléfine adjacente à ladite couche centrale. On prépare cette pellicule en réalisant une orientation biaxiale d'un mélange extrudé, puis en étirant le mélange extrudé à 10 à 40 % dans la direction de fabrication. La couche centrale contient du polypropylène isotactique et une quantité de polypropylène syndiotactique suffisante pour inhiber une thermorétraction uniaxiale à des températures inférieures à 50 °C. La couche superficielle peut être sélectionnée dans le groupe constitué par polypropylène, copolymère d'éthylène-propylène, polyéthylène, et terpolymère d'éthylène-propylène-butylène.
Designated States: AU, BR, CA, CN, ID, JP, KR, SG, VN
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
KR1020010012704SG69028VN4220EP0983138JP2001526599 CN1256661
CA2288822AU1998072964