Asphaltic concrete compositions comprising diene/vinyl aromatic copolymers

DETAILED DESCRIPTION I claim: 1.
An asphaltic concrete composition comprising an asphalt, a mineral aggregate, and a radial teleblock copolymer of a conjugated diene and a monovinyl aromatic monomer wherein the teleblock copolymer has a diene/monovinyl aromatic monomer weight ratio of at least about 75/25 to about 90/10 and a weight average molecular weight range of from about 150,000-300,000.
2.
A composition according to claim 1 wherein the diene/monovinyl aromatic weight ratio of the teleblock copolymer is within the approximate range 80/20 to 85/15 and the weight average molecular weight is in the approximate range 190,000 to 300,000.
3.
A composition according to claim 1 wherein the conjugated diene is selected from 1,3-butadiene and isoprene or mixtures thereof and the monovinyl monomer is styrene.
4.
A composition according to claim 1 wherein the asphalt and the copolymer are admixed to obtain a homogeneous dispersion whereupon the mineral aggregate is then admixed with the dispersion thus obtained.
5.
A composition according to claim 1 wherein the polymer weight average molecular weight is in the approximate range 130,000-300,000.
6.
A composition according to claim 1 wherein the ingredients of the composition are as follows:
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Ingredient Weight Percent
______________________________________
Mineral Aggregate
96.
95-77.
0
Asphalt 3.
0-20.
0
Radial Teleblock Copolymer
(2-15 parts per hundred asphalt)
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7.
A composition according to claim 1 wherein the ingredients of the composition are as follows:
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Ingredient Weight Percent
______________________________________
Mineral Aggregate
95.
3-91.
2
Asphalt 4.
5-8.
0
Radial Teleblock Copolymer
0.
20-0.
80
(5-10 parts per hundred asphalt)
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