Spatially modified elastic laminates

• US 5,468,428 A
• Filed: 06/02/1994
• Issued: 11/21/1995
• Est. Priority Date: 03/30/1990
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Karp, Gregory P., Hanschen, Thomas P., Krueger, Dennis L.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US08/252,898
• Time in Patent Office: 537 Days
• Field of Search: 264/22, 264/171, 264/210.7, 264/235.6, 264/288.4, 264/289.3
• US Class Current: 264/483
• CPC Class Codes: B29C 55/023 using multilayered plates or sheets
• CPC Class Codes: B29C 61/0616 layered or partially layered preforms, e.g. preforms with layers of adhesive or sealing compositions B29C61/0625 and B29C61/065 take precedence
• CPC Class Codes: B32B 2310/14 Corona, ionisation, electrical discharge, plasma treatment
• CPC Class Codes: B32B 2405/00 Adhesive articles, e.g. adhesive tapes labels B32B2519/00
• CPC Class Codes: B32B 2437/00 Clothing anti-ballistic clothing B32B2571/02
• CPC Class Codes: B32B 25/08 of synthetic resin
• CPC Class Codes: B32B 2555/02 Diapers or napkins
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: B32B 38/0008 Electrical discharge treatment, e.g. corona, plasma treatment; wave energy or particle radiation heat treatment B32B38/0036
• CPC Class Codes: Y10S 428/91 Product with molecular orientation
• CPC Class Codes: Y10T 428/24446 Wrinkled, creased, crinkled or creped
• CPC Class Codes: Y10T 428/24669 Aligned or parallel nonplanarities
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

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.

Claims

1. A method of forming a zone activatable inelastic laminate comprising the steps of providing a multilayer laminate of elastomeric core and thermoplastic skin layers and treating said laminate at certain regions in one or more layers to provide preferential activation zones wherein said preferential activation zones will preferentially elongate and recover to form an elastic zone.

2. The method of claim 1 wherein said laminate is treated to have regions with lower composite modulus values, than adjacent regions.

3. The method of claim 2 wherein said lower modulus regions are provided by annealing adjacent regions.

4. The method of claim 1 wherein said laminate is treated to have preferential stress regions.

5. The method of claim 4 wherein said preferential stress region is created by corona discharge treatment.

6. The method of claim 5 wherein said corona discharge treatment comprises treating regions of the laminate below the corona saturation point and generating microcracks ,in said region by uniform deformation of said laminate.

7. The method of claim 6 wherein said uniform deformation is provided by a sharp takeup angle of said laminate from a surface.

8. The method of claim 5 wherein said corona treatment comprises exposing said laminate to above saturation discharge levels to ablate material from one or more layers of said laminate.