Shrinkable polyamide film and process for its production

Details Shrinkable polyamide film and process for its production Shrinkable polyamide film and process for its production

1983-09-07

1984-08-21

Herbert, Jr., Thomas J.

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

Synthetic resins

From carboxylic acid or derivative thereof

4284755, 4284761, C08G 6902

Patent

active

044670842

ABSTRACT:
A shrinkable polyamide film useful for wrapping hams, sausages, etc. The shrinkable film has a hydrothermal shrinking ratio of at least 30% in both MD and TD and a hydrothermal shrinkage stress of from 300 to 700 g/mm.sup.2. The film is produced by a process which comprises biaxially stretching a substantially amorphous film composed of a copolymer of 6,6-nylon/6-nylon in a weight ratio of from 5/95 to 25/75 at a temperature of not higher than 120.degree. C. and at a stretching ratio of at least 2.5 times in both MD and TD, and subjecting the stretched film to stress relaxation at a temperature of from the stretching temperature to 170.degree. C., followed by winding it up. Further, a shrinkable film having an oxygen gas permeability of not more than 20 cc/m.sup.2 .multidot.24 hrs. atm. as well as the above properties may be obtained by coating a polyvinylidene chloride resin prior to the stretching so that its solid content after the stretching becomes to be at least 0.5 g/m.sup.2.

REFERENCES:
patent: 3557544 (1971-01-01), Simons
patent: 3687904 (1972-08-01), Middleton
patent: 3993611 (1976-11-01), Sims et al.

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