Epoxy tape

Abstract

An epoxy tape useful as an adhesive sealant comprised of a first band of an uncured epoxy resin composition and a second band comprised of a composition capable of curing the epoxy resin. Kneading together of substantially equal lengths of opposed portions of the first and second bands results in an epoxy composition which is self-curing.

Having thus described the invention, what is claimed is: 
     
       1. An epoxy tape comprising a first band of of an uncured epoxy resin composition and a second band, said bands being joined in close side-by-side relation throughout their entire length, said second band comprising a composition capable of curing of said epoxy resin in said tape when said first and second bands are combined to form a substantially uniform mixture .Iadd.whereby said tape may be mixed by kneading and may be cured at ambient temperature, at elevated tempertures, and under water and remains in a stable uncured state in absence of kneading.Iaddend.. 
     
     
       2. An epoxy tape according to claim 1 wherein said epoxy resin has an epoxy equivalent weight of about 650 to 750 and a kinematic viscosity of 15 to 25 poises at 25° C. and said curing agent for said epoxy resin is a blend of polyamide resins having an amine value of 90 to 375 and a viscosity of 5 to 80 poises at 150° C. 
     
     
       3. An epoxy tape according to claim 2 wherein said epoxy resin is a blend of a solid epoxy resin with a liquid epoxy resin said blend having a kinematic viscosity of 0.01 to 10 poises at 25° C. 
     
     
       4. An epoxy tape according to claim 2 wherein said epoxy resin and said polyamide resin are admixed with fillers and colorants selected from the group consisting of talc, alumina, asbestos fiber, titanium dioxide, carbon black and mixtures thereof forming an extrudable composition. 
     
     
       5. An epoxy tape according to claim 4 wherein said epoxy tape also includes about 30% to 40%, by weight, based on the weight of said tape of an electrically conductive substance selected from the group consisting of electrically conductive carbon black and silver powder. .Iadd. 6. A kneadable epoxy tape according to claim 1 wherein said first and second bands are of different color and visually distinct one from the other, so that substantially complete mixing of the material of one band with that of the other to form a substantially uniform mixture can be detected 
     
     
        visually by formation of a substantially uniform color. .Iaddend. 7. A kneadable epoxy tape according to claim 1 wherein said first and second bands are self supporting and characterized in that substantially equal portions of said first and second bands can be removed from the tape and kneaded together forming a curable epoxy resin product. .Iadd. 8. A kneadable epoxy tape according to claim 1 wherein said first and second bands remain in a stable and uncured state in absence of removing portions of said bands from the epoxy tape and kneading said removed portions of said bands to form a curable epoxy resin product. .Iaddend..Iadd. 9. A kneadable epoxy tape according to claim 1 wherein said second band contains a sufficient amount of curing agent to crosslink about 70 to about 150 percent of the available crosslinking sites in the epoxy resin in said first band of the epoxy tape. .Iaddend..Iadd. 10. A kneadable epoxy tape according to claim wherein said first and second bands are simultaneously extruded in side-by-side relationship. .Iaddend.