MULTILAYERED STRETCHABLE SHRINK FILM

Title:

MULTILAYERED STRETCHABLE SHRINK FILM

Document Type and Number:

WIPO Patent Application WO/1992/008611

Kind Code:

A1

Abstract:

A high-strength multilayered shrink film produced from a group A resin comprising low-density polyethylene, a copolymer of a specified monomer with ethylene and so forth, a group B resin comprising a flexible thermoplastic elastomer with a Vicat softening point of 80 °C or below, and a group C resin comprising a specified polymer such as crystalline polypropylene or a mixture thereof, which film has at least five layers including a surface layer (S layer) mainly comprising at least one polymer selected among the groups A and B resins, etc., at least one base layer (SBC layer) mainly comprising a mixed composition comprising a combination of the groups A, B and C resins, etc., at least one core layer (H layer) mainly comprising a polymer selected among the group C resins, and at least one auxiliary layer (R layer) mainly comprising at least one polymer selected among the groups A and B resins as the inner layer, provided that when the R layer is adjacent to the S layer, the R layer comprises a resin different from that of the S layer. This film is excellent in heat-resistant shrink and stretchability and applicable to various packaging uses. The invention also discloses a process for producing this film.

Inventors:

YOSHIMURA ISAO (JP)
KAHATA SHIN (JP)

Application Number:

PCT/JP1991/001551

Publication Date:

May 29, 1992

Filing Date:

November 13, 1991

Export Citation:

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Assignee:

ASAHI CHEMICAL IND (JP)

International Classes:

B29C55/02; B29C61/06; B32B25/08; B32B27/08; B32B27/32; B65D65/40; C08L53/02; B29K23/00; (IPC1-7): B29C5/12; B29K23/00; B29L9/00; B32B25/08; B32B27/32

Foreign References:

JPS58175635A	1983-10-14
JPS6079932A	1985-05-07
JPS55118859A	1980-09-12
US4430378A	1984-02-07
JPS58175635A	1983-10-14
JPS6079932A	1985-05-07
US4619859A	1986-10-28

Other References: