Heat-sealable shrink film based on polypropylene

Details Heat-sealable shrink film based on polypropylene Heat-sealable shrink film based on polypropylene

1989-05-03

1993-08-10

Sluby, P. C.

Stock material or miscellaneous articles

Hollow or container type article

Polymer or resin containing

428215, 428349, 428516, 428910, 2641761, B65D 6540, B29C 4714, B32B 2708, B32B 2732

Patent

active

052347338

ABSTRACT:
A shrink film which is comprised of a plurality of polyolefinic layers is disclosed. The base layer comprises polypropylene and a hydrogenated hydrocarbon resin admixture, and the top layers on each side of the base layer comprise polyolefinic sealable raw materials. The film possesses a shrinkability of more than 15% in the transverse direction and of less than 6% in the longitudinal direction, both measured at 90.degree. C. Also disclosed is a process for manufacturing the film comprising coextrusion followed by stretching of the film in the longitudinal and transverse directions, whereby stretching in the longitudinal direction is performed such that the double refraction value .DELTA.n of the longitudinally oriented film is not greater than 15.times.10.sup.-3.

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Roder, "Schrumpfetikettierung-Technik und Anwendung," Verpackungs-Rundschau, Oct. 1983, pp. 1121-1122.
Patent Abstract, TORA, A97, 87-147803/21, JP2086-388-A, Nov. 10, 1985, JP224868.
Patent Abstract, 96:218923g, Jpn. Kokai Tokkyo Koho JP 82 15.958, Jan. 27, 1982, Appl. 80/91,354, Jul. 3, 1980.

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