Transparent shrink film based on polypropylene, process for its

Details Transparent shrink film based on polypropylene, process for its Transparent shrink film based on polypropylene, process for its

1989-06-26

1992-02-25

Buffalow, Edith L.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428349, 428516, 428519, 428910, 525240, 525211, 525192, 264291, B32B 702

Patent

active

050912372

ABSTRACT:
A shrink film comprising at least one polyolefinic layer comprising polypropylene and a resin admixture is disclosed. The film processes a shrinkability of more than 20%, measured at 90.degree. C., in the transverse direction and of less than 8%, also measured at 90.degree. C., in the longitudinal direction. The film is manufactured by coextrusion followed by stretching in the longitudinal and transverse directions, whereby stretching in the longitudinal direction is performed such that the birefringence value .DELTA.n of the longitudinally oriented film does not exceed the range from 10.times.10.sup.-3 to 13.times.10.sup.-3.

REFERENCES:
patent: 4352849 (1982-10-01), Mueller
patent: 4378404 (1983-03-01), Liu
patent: 4649009 (1987-03-01), Shibata et al.
patent: 4766178 (1988-09-01), Hwo
patent: 4769421 (1988-09-01), Hwo
patent: 4786533 (1988-11-01), Crass et al.
patent: 4927885 (1990-05-01), Hayashida et al.

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