Composite adhesive tape

• US 5,585,178 A
• Filed: 12/31/1991
• Issued: 12/17/1996
• Est. Priority Date: 12/31/1991
• Status: Expired due to Fees

• Current Assignee: 3M Company
• Original Assignee: 3M Company
• Inventors: Koskenmaki, David C., Calhoun, Clyde D.
• Primary Examiner(s): ZIRKER, DANIEL R
• Application Number:
  US07/815,173
• Time in Patent Office: 1,813 Days
• Field of Search: 428/343, 428/355, 428/354, 428/317.5, 428/195, 428/212, 428/198
• 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. An adhesive tape including an adhesive layer having first and second planar surfaces coated on a carrier web, said adhesive layer comprising a first adhesive and a second adhesive, said first and second adhesives having different viscoelastic properties from the other, both said first and second adhesives being continuous through the thickness of the adhesive layer, and wherein said first adhesive is laterally continuous and said second adhesive is laterally non-continuous.

2. The adhesive tape of claim 1 wherein said first and second adhesives are pressure-sensitive adhesives.

3. The adhesive tape of claim 1 wherein one of said adhesives is pressure-sensitive and the other adhesive is hot-tackifying.

4. The adhesive tape of claim 1 wherein at least one of said adhesives is a thermoset adhesive.

5. The adhesive tape of claim 1 wherein the second adhesive comprises more than 50% by volume of the adhesive layer.

6. The adhesive tape of claim 1 wherein the second adhesive is provided in a precise pattern at the first and second planar surfaces of the adhesive layer.