Magnetized hot melt adhesive articles

• US 5,985,435 A
• Filed: 01/23/1996
• Issued: 11/16/1999
• Est. Priority Date: 01/23/1996
• Status: Expired due to Term

• Current Assignee: Zephyros, Inc.
• Original Assignee: L&L Products Inc.
• Inventors: Coon, Thomas, Stebbins, Thomas, Czaplicki, Michael
• Primary Examiner(s): Speer, Timothy
• Assistant Examiner(s): Bahta, Abraham
• Application Number:
  US08/590,009
• Time in Patent Office: 1,393 Days
• Field of Search: 156/306.6, 156/244.17, 156/327, 156/244.25, 428/195, 428/411.1, 428/204, 428/688, 428/689, 428/692, 428/323, 428/900, 428/356, 204/174.11
• US Class Current: 428/323
• CPC Class Codes: B32B 27/18 characterised by the use of special additives
• CPC Class Codes: C08K 2201/01 Magnetic additives
• CPC Class Codes: C09J 2301/122 the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
• CPC Class Codes: C09J 2301/304 the adhesive being heat-activatable, i.e. not tacky at temperatures inferior to 30°C
• CPC Class Codes: C09J 2301/408 additives as essential feature of the adhesive layer
• CPC Class Codes: C09J 2433/00 Presence of (meth)acrylic polymer
• CPC Class Codes: C09J 7/22 Plastics; Metallised plastics
• CPC Class Codes: C09J 7/35 Heat-activated
• CPC Class Codes: Y10S 428/90 Magnetic feature
• CPC Class Codes: Y10T 428/24802 Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]
• CPC Class Codes: Y10T 428/24876 Intermediate layer contains particulate material [e.g., pigment, etc.]
• CPC Class Codes: Y10T 428/25 Web or sheet containing structurally defined element or component and including a second component containing structurally defined particles
• CPC Class Codes: Y10T 428/2857 including metal or compound thereof or natural rubber
• CPC Class Codes: Y10T 428/31504 Composite [nonstructural laminate]

Abstract

A reinforced magnetic hot patch has an attached rigid backing. The hot patch expands and flows when heated to seal an opening in a structural member. A non-planar magnetic hot patch is also provided.

Claims

1. An assembly for sealing an opening in a surface, comprising:

a hot melt patch, said hot melt patch having a rigid reinforcing backing; and

said hot melt patch further having a non-planar magnetic hot melt adhesive body, said non-planar magnetic hot melt adhesive body having magnetic particles dispersed therein;

said non-planar magnetic hot melt adhesive body being bonded to said rigid reinforcing backing.

2. The invention recited in claim 1, wherein said opening has surrounding surfaces which are non-planar and wherein said non-planar magnetic hot melt adhesive body mates with said non-planar surfaces surrounding said opening.

3. The invention recited in claim 1, wherein said non-planar magnetic hot melt adhesive body includes a thermoplastic resin.

4. The invention recited in claim 1, wherein said non-planar magnetic hot melt adhesive body contains an elastomer, a tackifier, an acrylic resin and a curing agent.

5. The invention recited in claim 1, wherein said magnetic particles are selected from the group consisting of barium ferrite, strontium ferrite, and iron oxide.

6. The invention recited in claim 1, wherein said non-planar magnetic hot melt adhesive body further contains an additive selected from the group consisting of antioxidants, antiozonants, ultraviolet absorbers, antistatic agents, colorants, coupling agents, curing agents, flame retardants, blowing agents, heat stabilizers, impact modifiers, lubricants, plasticizers, preservatives, processing aids and stabilizers and combinations thereof.

7. The invention recited in claim 4, wherein said non-planar magnetic hot melt adhesive body further contains a multifunctional cross-linking monomer.

8. The invention recited in claim 1, wherein said non-planar magnetic hot melt adhesive body contains a blowing agent.

9. The invention recited in claim 1, wherein said rigid backing is metal.

10. The invention recited in claim 1, wherein said rigid backing is plastic.

11. A patch assembly, comprising:

a magnetic hot patch having a rigid non-planar reinforcing backing;

said magnetic hot patch further having a non-planar adhesive body bonded to said rigid non-planar reinforcing backing;

said non-planar adhesive body containing a plurality of magnetized particles; and

said non-planar adhesive backing further containing a blowing agent.

12. The invention recited in claim 11, wherein said adhesive body includes a thermoplastic resin.

13. The invention recited in claim 11, wherein said adhesive body contains an elastomer, a tackifier, an acrylic resin and a curing agent.

14. The invention recited in claim 11, wherein said magnetic particles are selected from the group consisting of barium ferrite, strontium ferrite, and iron oxide.

15. The invention recited in claim 11, wherein said magnetic hot melt adhesive further contains an additive selected from the group consisting of antioxidants, antiozonants, ultraviolet absorbers, antistatic agents, colorants, coupling agents, curing agents, flame retardants, blowing agents, heat stabilizers, impact modifiers, lubricants, plasticizers, preservatives, processing aids and stabilizers and combinations thereof.

16. The invention recited in claim 13, wherein said adhesive body further contains a multifunctional cross-linking monomer.

17. The invention recited in claim 11, wherein said rigid backing is metal.

18. The invention recited in claim 11, wherein said rigid backing is plastic.

19. A hot melt patch assembly for sealing an opening in a surface, comprising:

a rigid non-planar metal backing; and

a non-planar magnetic hot melt adhesive body, said non-planar magnetic hot melt adhesive body including a plurality of magnetic particles, ethylene vinyl acetate copolymer, an acrylic resin, a tackifier, a blowing agent, a multifunctional cross-linking monomer and a peroxy cross-linking agent wherein said magnetic particles comprise from about 50 to about 85 percent by weight of said adhesive body, said ethylene vinyl acetate comprises from about 2 to about 20 percent by weight of said adhesive body, said acrylic resin comprises from about 10 to about 30 percent by weight of said adhesive body, said tackifier comprises from about 2.5 to about 10 percent by weight of said adhesive body, said blowing agent comprises from about 0.1 to about 1.0 percent by weight of said adhesive body, said multifunctional cross-linking monomer comprises from about 0.05 to about 0.5 percent by weight of said adhesive body and said peroxy cross-linking agent comprises from about 0.1 to about 1.5 percent by weight of said adhesive body.

20. A magnetic hot melt adhesive patch, comprising:

a main body portion;

said main body portion being formed of a hydrocarbon resin;

said hydrocarbon resin containing a plurality of magnetic particles; and

a flange portion extending from said main body portion, said flange and said main body portion being shaped to be received by an opening and a metal surface surrounding said opening.

21. An assembly for sealing an opening in a surface, comprising:

a hot melt patch, said hot melt patch having a rigid reinforcing backing; and

said hot melt patch further having a non-planar magnetic hot melt adhesive body, said non-planar magnetic hot melt adhesive body having magnetic particles dispersed therein;

said non-planar magnetic hot melt adhesive body being bonded to said rigid reinforcing baking and said reinforcing backing generally retaining its shape after said hot melt adhesive body has been cured by exposure to heat.