Composite materials and process
First Claim
1. A fastening tab comprising a closure layer and a backing of a coextruded film having two faces comprising at least one discrete elastomeric core containing region capable of elastic elongation and a matrix of thermoplastic polymeric material, which polymeric matrix material is less elastic than the elastomeric core material, said matrix material completely circumscribing said at least one discrete elastomeric core so that there is at least two nonelastic film regions comprising matrix material, wherein the thickness and the presence of the elastomeric core material varies across the film length and/or width and wherein when said coextruded film is stretched past the inelastic deformation limit of the matrix material around said at least one elastomeric core the film will be capable of recovery in the at least one elastomeric core containing region to form a microtextured skin layer, formed of the matrix material over the at least one elastomeric core, only in the elastomeric core containing region of said film, wherein at least one nonelastic film region contains the closure layer.
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Accused Products
Abstract
Composite films and film laminates comprising at least one elastomeric core and a surrounding nonelastomeric matrix preferably prepared by coextrusion. The film when stretched and allowed to recover will create an elastomeric composite.
166 Citations
15 Claims
- 1. A fastening tab comprising a closure layer and a backing of a coextruded film having two faces comprising at least one discrete elastomeric core containing region capable of elastic elongation and a matrix of thermoplastic polymeric material, which polymeric matrix material is less elastic than the elastomeric core material, said matrix material completely circumscribing said at least one discrete elastomeric core so that there is at least two nonelastic film regions comprising matrix material, wherein the thickness and the presence of the elastomeric core material varies across the film length and/or width and wherein when said coextruded film is stretched past the inelastic deformation limit of the matrix material around said at least one elastomeric core the film will be capable of recovery in the at least one elastomeric core containing region to form a microtextured skin layer, formed of the matrix material over the at least one elastomeric core, only in the elastomeric core containing region of said film, wherein at least one nonelastic film region contains the closure layer.
Specification