Composite materials and process
AssigneeMinnesota Mining and Manufacturing Company
InventorsLeigh E. Wood, Dennis L. Krueger, Michael R. Gorman, Randall L. Alberg
Life of this patent
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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.
Claims9
A continuous nonwoven film laminate comprising at least one fibrous nonwoven layer laminated to a coextruded film 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 nonelastic matrix material, wherein the thickness and the presence of the elastomeric core material varies across the film length and/or width and wherein said coextruded film has been stretched in the transverse direction past the inelastic deformation limit of the matrix material around said at least one elastomeric core 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, said laminate is extensible in the transverse direction and nonextensible in the longitudinal direction.
Dependencies are inferred from the claim text.