A nonwoven composite that exhibits latent elastic properties is provided.
The composite is formed from an elastic film laminated to a nonwoven web
facing. Latent elasticity may be imparted to the elastic film through the
combination of a thermoplastic elastomer and a polyolefin capable of
forming semi-crystalline domains among the amorphous elastomeric chains.
More specifically, the elastic film may be stretched in one or more
directions to orient the elastomer chains. Without intending to be
limited by theory, the present inventors believe that the oriented state
of the chains may be held in place by the relatively stiff
semi-crystalline domains of the polyolefin. The stretched elastic film
may subsequently be relaxed and bonded to a nonwoven web facing to form
the composite. The composite may be later activated (e.g., heated) to
shrink the elastic film and provide it with "latent" stretchability. For
instance, the composite may be heated at or above the softening
temperature of the polyolefin to soften the crystalline domains and allow
the chains to return to their unoriented state. As a result of the
present invention, the elastic film may be extended and recover from its
unoriented state.