Blended pressure-sensitive adhesives

• US 6,063,838 A
• Filed: 10/03/1997
• Issued: 05/16/2000
• Est. Priority Date: 02/16/1995
• Status: Expired due to Term

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Hyde, Patrick D., Patnode, Gregg A.
• Primary Examiner(s): Warzel, Mark L.
• Application Number:
  US08/943,430
• Time in Patent Office: 956 Days
• Field of Search: 525/98, 525/99, 523/172
• US Class Current: 523/172
• CPC Class Codes: C09J 201/00 Adhesives based on unspecified macromolecular compounds
• CPC Class Codes: C09J 7/38 Pressure-sensitive adhesives [PSA]
• CPC Class Codes: C09J 9/00 Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks C09J7/00 takes precedence

Abstract

A pressure-sensitive adhesive comprising a blend of at least two components, wherein the first component is at least one pressure-sensitive adhesive and the second component is at least one thermoplastic material, wherein the components form a blended composition having more than one domain and, wherein one domain is substantially continuous (generally, the pressure-sensitive adhesive) and the other domain is substantially fibrillous to schistose (generally, the thermoplastic material). The second component can be (a) at least one thermoplastic elastomer, (b) at least one elastomer with a tackifying resin or (c) at least one elastomer.

Claims

1. A pavement marking article comprising a blend of at least one pressure-sensitive adhesive component and at least one thermoplastic material component being immiscible with the pressure-sensitive adhesive component at use temperature, the composition including (1) at least 40 weight percent pressure-sensitive adhesive component and at least 5 weight percent thermoplastic material component and (2) a morphology comprising at least two distinct domains, a first domain being substantially continuous and a second being fibrillous to schistose, having a resistance to impact shear that is at least two times greater than that of the pressure sensitive adhesive component if used alone, and having at least one pressure-sensitive adhesive property from the group consisting of (a) a peel adhesion greater than and shear strength similar to that of the pressure-sensitive adhesive component if used alone, (2) a shear strength greater than and peel adhesion similar to that of the pressure-sensitive adhesive component if used alone, (3) an anisotropic peel adhesion, (4) an anisotropic shear strength and (5) a tensile stress in the down-web direction that is at least 2 times greater than the tensile stress in the cross-web direction for all elongations up to the break elongation.

2. A pavement marking article comprising a blend of at least one pressure-sensitive adhesive component and at least one thermoplastic material component being immiscible with the pressure-sensitive adhesive component at use temperature, the composition including (1) at least 40 weight percent pressure-sensitive adhesive component and at least 5 weight percent elastomeric thermoplastic material component and (2) a morphology comprising at least two distinct domains, a first domain being substantially continuous and a second being fibrillous to schistose, having a resistance to impact shear that is at least two times greater than that of the pressure sensitive adhesive component if used alone, and having at least one pressure-sensitive adhesive property from the group consisting of (a) a peel adhesion greater than and shear strength similar to that of the pressure-sensitive adhesive component if used alone, (2) a shear strength greater than and peel adhesion similar to that of the pressure-sensitive adhesive component if used alone (3) an anisotropic peel adhesion, (4) an anisotropic shear strength and (5) a tensile stress in the down-web direction that is at least 2 times greater than the tensile stress in the cross-web direction for all elongations up to the break elongation.

3. A pavement marking article comprising a blend of at least one pressure-sensitive adhesive component and at least one thermoplastic material component being immiscible with the pressure-sensitive adhesive component at use temperature, the composition including (1) at least 40 weight percent pressure-sensitive adhesive component and at least 5 weight percent elastomeric material component and (2) a morphology comprising at least two distinct domains, a first domain being substantially continuous and a second being fibrillous to schistose, having a resistance to impact shear that is at least two times greater than that of the pressure sensitive adhesive component if used alone, and having at least one pressure-sensitive adhesive property from the group consisting of (a) a peel adhesion greater than and shear strength similar to that of the pressure-sensitive adhesive component if used alone, (2) a shear strength greater than and peel adhesion similar to that of the pressure-sensitive adhesive component if used alone, (3) an anisotropic peel adhesion, (4) an anisotropic shear strength and (5) a tensile stress in the down-web direction that is at least 2 times greater than the tensile stress in the cross-web direction for all elongations up to the break elongation.