Bioriented film

Details Bioriented film Bioriented film

1990-06-08

1993-08-31

Teskin, Fred

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Polymers from only ethylenic monomers or processes of...

5263483, 5263484, 5263485, 5263486, 525240, 428332, 428339, 428500, 428516, 428910, 2642101, 2642107, 2642902, B32B 2710, C08L 2320

Patent

active

052410307

ABSTRACT:
At least one layer of mono- or multilayered, bioriented film contains as film-forming polymers (A) from 75 to 100 percent of a linear ethylene/alpha-olefin copolymer having a density of from 0.890 g/cm.sup.3 to 0.930 g/cm.sup.3 and
(B) from 25 to 0 percent of a high density linear polyethylene having a density of from 0.935 g/cm.sup.3 to 0.960 g/cm.sup.3. All percentages are based on the total weight of (A) and (B).
The total of the film-forming polymers (A) and (B) has a single melting point as determined by differential scanning calorimetry.
The bioriented film is produced by biorienting a flat film in at least two steps first in one direction and then in the other direction. The bioriented film is useful in a process for packaging an article wherein the film is wrapped around the article, heat-shrunk and sealed.

REFERENCES:
patent: 3299194 (1967-01-01), Golike
patent: 4405774 (1983-09-01), Miwa et al.
patent: 4680207 (1987-07-01), Murray
patent: 5091228 (1992-02-01), Fujii et al.
Schwartz et al, Plastics Materials and Processes, Van Nostrand Reinhold Co., N.Y., 594 (1982).

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