Composite materials and process

• US 5,800,903 A
• Filed: 05/21/1996
• Issued: 09/01/1998
• Est. Priority Date: 03/30/1990
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Alberg, Randall L., Krueger, Dennis L., Wood, Leigh E., Gorman, Michael R.
• Primary Examiner(s): McCamish, Marion E.
• Assistant Examiner(s): Copenheaver, Blaine R.
• Application Number:
  US08/646,790
• Time in Patent Office: 833 Days
• Field of Search: 428/343, 428/354, 428/906, 428/152, 428/179, 428/230, 428/231
• US Class Current: 428/152
• CPC Class Codes: A61F 13/51464 being stretchable or elastomeric
• CPC Class Codes: A61F 13/58 Adhesive tab fastener elements A61F13/5611, A61F13/5616, A61F13/66 take precedence
• CPC Class Codes: A61F 2013/49023 being textured, e.g. corrugated
• CPC Class Codes: A61F 2013/51427 having valves
• CPC Class Codes: B29C 2059/023 Microembossing
• CPC Class Codes: B29C 48/05 Filamentary, e.g. strands
• CPC Class Codes: B29C 48/08 flexible, e.g. films
• CPC Class Codes: B29C 48/19 the layers being joined at their edges
• CPC Class Codes: B29C 48/20 one of the layers being a strip, e.g. a partially embedded strip
• CPC Class Codes: B29C 48/21 the layers being joined at their surfaces
• CPC Class Codes: B29C 48/22 with means connecting the layers, e.g. tie layers or undercuts
• CPC Class Codes: B29C 48/307 specially adapted for bringing together components, e.g. melts within the die
• CPC Class Codes: B29C 55/023 using multilayered plates or sheets
• CPC Class Codes: B29C 59/18 by liberation of internal stresses, e.g. plastic memory
• CPC Class Codes: B29C 61/02 Thermal shrinking
• CPC Class Codes: B32B 2307/51 Elastic
• CPC Class Codes: B32B 25/08 of synthetic resin
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 43/00 Operations specially adapted for layered products and not otherwise provided for, e.g. repairing; Apparatus therefor
• CPC Class Codes: Y10S 428/906 Roll or coil
• 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 428/249923 : Including interlaminar mechanical fastener
• CPC Class Codes: Y10T 428/28 : Web or sheet containing structurally defined element or component and having an adhesive outermost layer
• CPC Class Codes: Y10T 428/2848 : Three or more layers
• CPC Class Codes: Y10T 428/2929 : Bicomponent, conjugate, composite or collateral fibers or filaments [i.e., coextruded sheath-core or side-by-side type]
• CPC Class Codes: Y10T 428/2933 : Coated or with bond, impregnation or core
• CPC Class Codes: Y10T 428/2935 : Discontinuous or tubular or cellular core
• CPC Class Codes: Y10T 442/601 : Nonwoven fabric has an elastic quality

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.

Claims

1. A roll of tape comprising a pressure-sensitive adhesive layer and a backing of a coextruded elastic film having two faces comprising at least one discrete elastomeric core within a thermoplastic matrix, wherein said thermoplastic matrix is less elastic than the elastomeric core material, the thermoplastic matrix forming continuous surfaces on the two faces of the film with the thermoplastic matrix completely circumscribing the at least one elastomeric core, wherein the thickness of the core and/or the core material presence varies across the film, and wherein said thermoplastic matrix has been stretched passed its inelastic deformation limit in at least one direction so as to form at least one microtextured skin layer formed of the thermoplastic matrix material over the at least one elastomeric core having at least one nonelastic end region free of elastomeric core coated with a pressure-sensitive adhesive layer.

2. The roll of tape of claim 1 further comprising a low adhesion backsize on at least the face opposite the backing face coated with the pressure-sensitive adhesive layer.

3. The roll of tape of claim 1 further comprising a fibrous web layer attached to at least one face of the backing.

4. The roll of tape of claim 3 wherein the fibrous web is extrusion laminated to the coextruded film.