Composite adhesive tape

• US 5,738,939 A
• Filed: 09/20/1996
• Issued: 04/14/1998
• Est. Priority Date: 12/31/1991
• Status: Expired due to Term

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Koskenmaki, David C., Calhoun, Clyde D.
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US08/710,598
• Time in Patent Office: 571 Days
• Field of Search: 428/343, 428/355, 428/354, 428/317.5, 428/317.3, 428/195, 428/198, 428/212, 428/355 EP, 428/355 R
• US Class Current: 428/343
• CPC Class Codes: B32B 2405/00 Adhesive articles, e.g. adhesive tapes labels B32B2519/00
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 7/12 using interposed adhesives or interposed materials with bonding properties
• CPC Class Codes: Y10T 428/24826 Spot bonds connect components
• CPC Class Codes: Y10T 428/249983 As outermost component
• CPC Class Codes: Y10T 428/249984 Adhesive or bonding component contains voids
• 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 428/2852 Adhesive compositions

Abstract

The present invention provides adhesive articles that include more than one adhesive, or if one adhesive is used, include more than one adhesive portion, where, in each portion, the extent of cure of the adhesive is varied in a predetermined manner so that each adhesive portion behaves as if it were two or more different adhesives. The adhesive articles of the present invention are typically provided as adhesive tapes, often in the form of a tape having a longitudinal dimension (down-web dimension) that far exceeds its width (cross-web dimension).

Claims

1. A composite adhesive layer comprising:

a predetermined open, continuous, three-dimensional, discrete, skeletal structure of a first adhesive having a multiplicity of interconnected voids throughout the structure; and

at least one continuous layer of a second adhesive having different viscoelastic properties from the first adhesive and extending through the interconnected voids.

2. An adhesive layer according to claim 1 wherein the open discrete skeletal structure comprises intertwined serpentine strands of the first adhesive.

3. An adhesive layer according to claim 1 wherein the open discrete skeletal structure comprises a woven or non-woven mat of the first adhesive.

4. An adhesive layer according to claim 1 wherein the open discrete skeletal structure is an open cell foam of the first adhesive.

5. An adhesive layer according to claim 1 wherein either the first or second adhesive is a pressure sensitive adhesive.

6. An adhesive layer according to claim 1 wherein either the first or second adhesive is a hot-tackifying adhesive.

7. An adhesive layer according to claim 1 wherein either the first or second adhesive is a thermoset adhesive.

8. A composite adhesive layer having a first and a second major surface comprising:

a first adhesive having a predetermined open, continuous, three-dimensional, skeletal structure with a multiplicity of interconnected voids throughout the structure;

and at least one continuous layer of a second adhesive, having different viscoelastic properties from the first adhesive, and extending through the interconnected voids of the first adhesive.

wherein the first and second major surface each contain distinct regions of said first adhesive and said second adhesive.