Heat-shrinkable foamed composite film and process for preparatio

Details Heat-shrinkable foamed composite film and process for preparatio Heat-shrinkable foamed composite film and process for preparatio

1990-12-17

1991-12-03

Van Balen, William J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Discontinuous or differential coating, impregnation or bond

156 78, 156229, 264 459, 428203, 428213, 428215, 4283197, 4283199, B32B 326

Patent

active

050699539

ABSTRACT:
The invention provides a heat-shrinkable foamed composite film which is a film laminate composed of: (A) a laterally monoaxially-oriented foamed film of an olefin polymer having a thickness of about 40 to about 400 .mu.m and being heat-shrinkable predominantly in a lateral direction, (B) a laterally monoaxially-oriented film of an olefin polymer having a thickness of about 5 to about 50 .mu.m and being heat-shrinkable predominantly in a lateral direction, and (C) a laterally monoaxially-oriented printed polyester film having a thickness of about 5 to about 50 .mu.m and being heat-shrinkable predominantly in a lateral direction, the film laminate being formed by laminating the films (A), (B) and (C) in this order so that the printed surface of the film (C) is faced with the film (B), and the film laminate having a heat shrinkage factor of about 25 to about 50% in a lateral direction and about 0 to about 10% in a longitudinal direction under the conditions of 100.degree. C. for 30 seconds and has a Young's modulus of about 40 to about 170 kg/mm.sup.2 in a lateral direction and a tensile strength of about 5.0 to about 15.0 kg/cm in a lateral direction. The invention also provides a process for preparing the above composite film.

REFERENCES:
patent: 4049147 (1977-09-01), Stiles et al.
patent: 4273816 (1981-06-01), Tolette
patent: 4275112 (1981-06-01), Savage, Jr.

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