Multi-layer, pre-stretched elastic articles

Details Multi-layer, pre-stretched elastic articles Multi-layer, pre-stretched elastic articles

2006-10-24

2010-10-05

Salvatore, Lynda (Department: 1786)

Fabric (woven, knitted, or nonwoven textile or cloth, etc.)

Nonwoven fabric

Nonwoven fabric with a preformed polymeric film or sheet

C442S360000, C442S361000, C442S362000, C442S363000, C442S364000, C442S381000, C442S328000, C442S394000, C428S296700

Reexamination Certificate

active

07807593

ABSTRACT:
In one embodiment the invention is an article comprising at least two layers, a first or low crystallinity layer comprising a low crystallinity polymer and a second or high crystallinity layer comprising a high crystallinity polymer. The high crystallinity polymer has a melting point as determined by differential scanning calorimetry (DSC) that is about the same or within less than 25 C of the melting point of the low crystallinity polymer. The article is elongated at a temperature below the melting point of the low crystallinity polymer in at least one direction to an elongation of at least about 50% of its original length or width, to form a pre-stretched article. Preferably, the high crystallinity layer is capable of undergoing plastic deformation upon the elongation.

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