Claims
- 1. A process for making a thermoplastic elastomer blend composition, comprising the steps of
- providing a blend of a largely crystalline 1-olefin polymer, a random styrene-butadiene rubber and a bitumen,
- the amount of said 1-olefin polymer ranging from about 30 to about 45 parts by weight, the amount of said styrene-butadiene rubber ranging from about 65 to about 25 parts by weight, the amount of said bitumen ranging from about 10 to about 40 parts by weight,
- said 1-olefin polymer selected from the class consisting of a homopolymer and a copolymer made from 1-olefin monomers having from 2 to about 20 carbon atoms, said homopolymer or said copolymer having a melting point of at least 90.degree. C., and
- mixing said blend at a temperature at or above the melting point of said 1-olefin polymer and forming a reprocessable thermoplastic elastomer blend.
- 2. A process according to claim 1, wherein said bitumen is an asphalt, a tar, or a tar derivative,
- said asphalt selected from the group consisting of a petroleum asphalt, a native asphalt, and combinations thereof,
- said petroleum asphalt selected from the group consisting of straight-reduced asphalts, thermal asphalts, and air-blown asphalts,
- said native asphalts selected from the group consisting of an asphalt with a mineral content below 5 percent, an asphalt with a mineral content above 5 percent, and combinations thereof,
- said tar selected from the group consisting of a coal tar reduced to float grade, a coal-tar pitch, and combinations thereof,
- said tar derivative being a residua from pyrogenous distillates.
- 3. A process according to claim 2, wherein said 1-olefin polymer is polypropylene or polyethylene, wherein said 1-olefin copolymer is made from a major amount by weight of propylene monomers and a minor amount by weight of ethylene monomers, and
- wherein said butumen is said petroleum asphalt.
- 4. A process according to claim 3, wherein the molecular weight of said styrene-butadiene rubber ranges from about 50,000 to about 1,000,000, wherein the molecular weight of said 1-olefin polymer or copolymer ranges from about 20,000 to about 1,000,000, and wherein the softening point of said bitumen ranges from about 50.degree. F. to about 400.degree. F., and the melting point of said 1-olefin polymer or copolymer is at least 130.degree. C.
Parent Case Info
This is a Divisional Application of U.S. Ser. No. 140,905, filed Apr. 16, 1980, which is a continuation-in-part of Ser. No. 1,623, filed Jan. 8, 1979, now U.S. Pat. No. 4,250,273 which is a continuation-in-part of U.S. Ser. No. 879,308 filed Feb. 21, 1978 abandoned which in turn is a division of an application filed June 13, 1977 U.S. Ser. No. 806,306 abandoned.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
2918940 |
Carr |
Dec 1959 |
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Divisions (2)
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Number |
Date |
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Parent |
140905 |
Apr 1980 |
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Parent |
806306 |
Jun 1977 |
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Continuation in Parts (2)
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1623 |
Jan 1979 |
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Parent |
879308 |
Feb 1978 |
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