Spatially modified elastic laminates
DC CAFCFirst Claim
1. A multi-layer film laminate comprising at least one nonelastomeric skin film layer and at least one core film layer, the at least one skin film layer and the at least one core film layer together forming at least one preferential activation zone where the film laminate will preferentially elongate when stretched, wherein said at least one core film layer is substantially elastomeric, each of said core and skin layers being substantially coextensive and having relatively constant average thicknesses over both the at least one preferential activation zone and an at least one adjacent non-preferential activation zone such that, for a given skin or core layer, the skin or core layer thickness in one zone will be substantially the same as the same skin or core layer thickness in all zones, said at least one skin film layer and/or at least one core film layer are provided such that when the multi-layer laminate is stretched said at least one preferential activation zone will preferentially elongate and can recover in said preferential activation zone to become an elastic zone, of said multi-layer film laminate, and adjacent multi-layer non-preferential activation zones will not preferentially elongate to provide substantially inelastic zones.
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Abstract
Microtextured elastomeric laminates comprising at least one elastomeric layer and at least one thin skin layer is preferably prepared by coextrusion of the layers followed by stretching the laminate past the elastic limit of the skin layers in predetermined regions of the laminate and then allowing the laminate to recover in these regions.
249 Citations
56 Claims
- 1. A multi-layer film laminate comprising at least one nonelastomeric skin film layer and at least one core film layer, the at least one skin film layer and the at least one core film layer together forming at least one preferential activation zone where the film laminate will preferentially elongate when stretched, wherein said at least one core film layer is substantially elastomeric, each of said core and skin layers being substantially coextensive and having relatively constant average thicknesses over both the at least one preferential activation zone and an at least one adjacent non-preferential activation zone such that, for a given skin or core layer, the skin or core layer thickness in one zone will be substantially the same as the same skin or core layer thickness in all zones, said at least one skin film layer and/or at least one core film layer are provided such that when the multi-layer laminate is stretched said at least one preferential activation zone will preferentially elongate and can recover in said preferential activation zone to become an elastic zone, of said multi-layer film laminate, and adjacent multi-layer non-preferential activation zones will not preferentially elongate to provide substantially inelastic zones.
- 29. A multi-layer film laminate comprising at least one nonelastomeric skin film layer and at least one core film layer, the at least one skin layer and the at least one core layer forming preferential activation regions and non-preferential activation regions for a given skin or core layer, the skin or core layer thickness in one region will be substantially the same as the same skin or core layer thickness in all regions, wherein said at least one core layer is substantially elastomeric in said preferential activation regions, and said at least one skin layer and/or said at least one core layer are provided such that when the multi-layer laminate is stretched, said preferential activation regions can elongate and recover in the elongated regions to an elastic state.
- 38. An article having a film laminate with elastic regions comprising a film laminate having elasticized preferential activation zones and nonelasticized non-preferential activation zones which laminate is comprised of at least one nonelastomeric skin film layer and at least one at least partially elastomeric core film layer such that, for a given skin or core layer, the skin or core layer thickness in one zone will be substantially the same as the same skin or core layer thickness in all zones.
Specification