One-step method of producing an elastic, breathable film structure
AssigneeKimberly-Clark Worldwide, Inc.
InventorMichael T. Heffelfinger
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Abstract
A one-step method of imparting breathability and elasticity to a film includes coextruding elastic fibers within a matrix of a filled, semi-rigid film structure. Once the elastic fibers are within the film structure, the film can be stretched to impart breathability, while the elastic fibers provide elasticity. Furthermore, the elastic fibers can include an absorbent material. The resulting breathable, elastic film is particularly useful in diapers and other personal care products.
Claims25
A breathable, elastic film comprising a mixture of filler particles, a thermoplastic polymer, and at least one elastic fiber substantially continuously embedded within the thermoplastic polymer and the filler particles, the film having voids formed around the filler particles to facilitate passage of water vapor through the film.
A breathable, elastic multilayer film comprising:
- a primary breathable layer including a mixture of filler particles and a thermoplastic polymer, and having voids formed around the filler particles to facilitate passage of water vapor;
- at least one skin layer;
- and
- at least one elastic fiber between the primary breathable layer and the at least one skin layer.
Dependencies are inferred from the claim text.