The present invention provides self-fusing, or self-amalgamating, compositions comprising rubber blends, preferably formed into a tapes, which, after being elongated and, for example, wrapped around a substrate, fuse together to form a continuous layer. In preferred aspects of the invention, the com
The present invention provides self-fusing, or self-amalgamating, compositions comprising rubber blends, preferably formed into a tapes, which, after being elongated and, for example, wrapped around a substrate, fuse together to form a continuous layer. In preferred aspects of the invention, the composition comprises a partially pre-crosslinked polyisoprene, a halogenated polyisobutylene, a second polyisobutylene, a non-extractable plasticizer and a mineral filler.
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1. A self-fusing composition comprising:a base composition including from about 40 to about 80 parts by weight of a partially pre-crosslinked polyisoprene per 100 parts base composition and from about 20 to about 60 parts by weight of a halogenated polyisobutylene per 100 parts base composition; fro
1. A self-fusing composition comprising:a base composition including from about 40 to about 80 parts by weight of a partially pre-crosslinked polyisoprene per 100 parts base composition and from about 20 to about 60 parts by weight of a halogenated polyisobutylene per 100 parts base composition; from about 20 to about 40 parts by weight, per 100 parts base composition, of a second polyisobutylene having a molecular weight (viscosity average) of from about 50,000 to about 450,000; from about 2 to about 18 parts by weight, per 100 parts base composition, of a non-extractable plasticizer; and from about 40 to about 80 parts by weight, per 100 parts base composition, of a mineral filler. 2. The composition according to claim 1, wherein said composition is formed into a tape having a thickness of from about 0.001 to about 0.120 inches and a width of from about 1 to about 8 inches. 3. The composition according to claim 1, wherein the halogenated polyisobutylene comprises from about 0.2 to about 2.2% by weight of a halogen selected from the group consisting of chlorine and bromine. 4. The composition according to claim 3, wherein the halogenated polyisobutylene comprises from about 0.2 to about 2.5% chlorine by weight 5. The composition according to claim 3, wherein the halogenated polyisobutylene comprises from about 1.0 to about 1.8% chlorine by weight 6. The composition according to claim 1, further comprising from about 0.5 to about 5 parts by weight of an antioxidant per 100 parts base composition. 7. The composition according to claim 6, wherein the antioxidant comprises an alkyl-substituted quinoline. 8. The composition according to claim 6, wherein the antioxidant comprises 1,2-dihydro-2,2,4-trimethylquinoline. 9. The composition according to claim 1, further comprising from about 10 to about 50 parts by weight carbon black per 100 parts base composition. 10. The composition according to claim 1, further comprising from about 20 to about 40 parts by weight carbon black per 100 parts base composition. 11. The composition according to claim 1, wherein the partially pre-crosslinked polyisoprene is a peptized polyisoprene. 12. The composition according to claim 11, wherein the partially pre-crosslinked polyisoprene is selected from the group consisting of partially pre-crosslinked Indonesian rubber and partially pre-crosslinked Malaysian rubber. 13. The composition according to claim 1, wherein the halogenated polyisobutylene has a Mooney viscosity of from abou t 20 to about 70 at 125° C. 14. The composition according to claim 1, wherein the halogenated polyisobutylene has a Mooney viscosity of from about 33 to about 45 at 125° C. 15. The composition according to claim 1, wherein the second polyisobutylene has a molecular weight of from about 70,000 to about 320,000 daltons. 16. The composition according to claim 1, wherein the second polyisobutylene has a molecular weight of from about 90,000 to about 210,000 daltons. 17. The composition according to claim 1, wherein the non-extractable plasticizer comprises polybutene. 18. The composition according to claim 1, wherein the mineral filler comprises a member selected from the group consisting of ground mica, carbonates, clays, silicas and talcs. 19. The composition according to claim 1, wherein the mineral filler comprises platey talc. 20. The composition according to claim 1, further comprising from about 0.1 to about 6.0 parts by weight of a pigment per 100 parts base composition. 21. The composition according to claim 20, wherein the pigment is selected from the group consisting of pyrazolone, phthalocyanine, diarylide, phthalo/diarylide and disazo. 22. The composition according to claim 20, comprising from about 0.25 to about 5.0 parts by weight of a pigment per 100 parts base composition. 23. The composition according to claim 20, comprising from about 0.5 to about 3.0 parts by weight of a pigment per 100 parts base composition. 24. A method for making a self-fusing composition, comprising:providing a composition comprising a partially pre-crosslinked polyisoprene; blending a halogentated polyisobutylene with the polyisoprene to provide a master batch; blending into the master batch a second polyisobutylene, a non-extractable plasticizer and a mineral filler to provide a finished batch; and aging the finished batch at ambient temperature for at least about 24 hours. 25. The method according to claim 24, further comprising calendering the finished batch to provide a self-fusing tape having a thickness of from about 0.001 to about 0.120 inches. 26. The method according to claim 24, wherein said providing comprises:blending a peptizer and a partially pre-crosslinked polyisoprene to provide a composition having from about 0.2 to about 1.4 parts peptizer by weight per 100 parts polyisoprene; maintaining the composition at a ambient temperature for at least about 24 hours. 27. The method according to claim 24, wherein the partially pre-crosslinked polyisoprene is se lected from the group consisting of partially pre-crosslinked Indonesian rubber and partially pre-crosslinked Malaysian rubber. 28. A method for making a self-fusing composition, comprising:providing a composition comprising a partially pre-crosslinked polyisoprene, a halogenated polyisobutylene, a second polyisobutylene, a non-extractable plasticizer and a mineral filler, wherein the composition has been aged at ambient temperature for at least about 24 hours; and calendering the composition to provide a self-fusing tape having a thickness of from about 0.001 to about 0.120 inches. 29. The method in accordance with claim 28, wherein the composition comprises:a base composition comprising from about 40 to about 80 parts by weight partially pre-crosslinked polyisoprene per 100 parts base composition and from about 20 to about 60 parts by weight of a halogenated polyisobutylene per 100 parts base composition; from about 20 to about 40 parts by weight, per 100 parts base composition, of a second polyisobutylene having a molecular weight of from about 50,000 to about 450,000; from about 2 to about 18 parts by weight, per 100 parts base composition, of a non-extractable plasticizer; and from about 40 to about 80 parts by weight, per 100 parts base composition, of a mineral filler. 30. The method in accordance with claim 28, wherein said providing comprises:blending a peptizer and a partially pre-crosslinked polyisoprene to provide a composition having from about 0.2 to about 1.4 parts peptizer by weight per 100 parts polyisoprene; rolling the composition into a first sheet; maintaining the first sheet at ambient temperature for at least about 24 hours; blending a halogenated polyisobutylene with the peptized polyisoprene to provide a master batch; rolling the master batch into a second sheet; blending into the master batch a second polyisobutylene, a non-extractable plasticizer and a mineral filler to provide a finished batch; rolling the finished batch into a third sheet; and maintaining the third sheet at a ambient temperature for at least about 24 hours. 31. The method in accordance with claim 28, wherein said providing comprises:providing a master batch blend comprising a partially pre-crosslinked polyisoprene and a halogenated polyisobutylene; blending into the master batch a second polyisobutylene, a non-extractable plasticizer and a mineral filler to provide a finished batch; and aging the finished batch at ambient temperature for at least about 24 hours.
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