Tear-resistant low set elastic film and method of making

Details Tear-resistant low set elastic film and method of making Tear-resistant low set elastic film and method of making

2000-02-15

2002-10-29

Copenheaver, Blaine (Department: 1773)

Stock material or miscellaneous articles

Composite

Of addition polymer from unsaturated monomers

C428S156000, C428S332000, C428S523000

Reexamination Certificate

active

06472084

ABSTRACT:

BACKGROUND
The present invention relates to elastic films, and more particularly, to elastic films having high tear-strength and low set. Elastic films of the present invention having high tear-strength and low set exhibit surprisingly high tear resistance, especially when holes form on the films.
Elastic films of the present invention have a wide range of potential uses in both durable and disposable articles, but are particularly well suited for use in elastic waistbands and in products including absorbent products and the like.
SUMMARY OF THE INVENTION
The present invention relates to the coextrusion of a thin multi-layer elastic film that stretches in the transverse direction. The elastic film has a first layer, a second layer and a core layer. The film has activation zones and non-activated zones. The activated zones have sufficient elasticity to stretch to at least 200% while maintaining a permanent set percent of no more than 5%. The non-activated zones have sufficient non-elastic to stretch at least 200% while maintaining a permanent set percent of up to 5%. The activated zones have a tear strength as measured by the Elmendorf Tear Test of 30 g while the non-activated zones have a tear strength as measured by the Elmendorf Tear Test of at least 50 g. The elastic film is particularly useful as an elastic waistband for use in products including absorbent products such as waist bands, side panels and the like. The superior tear-strength of the film prevents tearing during use of the film and promotes longer-lasting applications of the film., In addition, the superior tear-strength of the film prevents existing tears from propagating throughout the film. For ease of illustration, a thin multi-layer coextruded elastomeric film is described in detail herein in
FIGS. 1-7
. However, this detailed description will allow those skilled in the art to adapt this invention to produce elastomeric film for other applications.


REFERENCES:
patent: 4300967 (1981-11-01), Sigl
patent: 4350655 (1982-09-01), Hoge
patent: 4368565 (1983-01-01), Schwartz
patent: 4476180 (1984-10-01), Wnuk
patent: 4777073 (1988-10-01), Sheth
patent: 4880682 (1989-11-01), Hazelton et al.
patent: 4892903 (1990-01-01), Himes
patent: 5167897 (1992-12-01), Weber et al.
patent: 5344691 (1994-09-01), Hanschen et al.
patent: 5354597 (1994-10-01), Capik et al.
patent: 5395471 (1995-03-01), Obijeski et al.
patent: 5429856 (1995-07-01), Krueger et al.
patent: 5501679 (1996-03-01), Krueger et al.
patent: 5691034 (1997-11-01), Krueger et al.
patent: 5733628 (1998-03-01), Pelkie
patent: 5840412 (1998-11-01), Wood et al.
patent: 5993432 (1999-11-01), Lodge et al.
patent: 0 703 068 (1993-06-01), None
patent: 0521 883 (1996-08-01), None
“SEF: A New Elastic Film for the Hygiene Industry”, Nordenia Technologies, pp. 1-4, date of first publication unknown, but published at least as early as Apr. 1999.
Baldaug, Georg, “Zero Stain Film for Elastic Diaper Components”, Nordenia Technologies GbmH, pp. 1-6, date of first publication unknown, but published at least as early as Mar. 1999.

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