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US 5,328,943 AGranted
Asphalt compositions for pavement
AssigneeNippon Oil Co., Ltd.
InventorsMasao Isobe, Yoshio Aizawa
Life of this patent
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Abstract
An asphalt composition for use in road pavements is disclosed which comprises chiefly of an asphalt of natural or petroleum origin, a thermoplastic elastomer and/or a styrene-butadiene rubber and a low molecular weight polypropylene. These components are premixed or plant-mixed to form a reformed asphalt which is mixed with an aggregate to provide a paving material having increased compression strength, increased low temperature viscosity and decreased high temperature viscosity.
Claims7
An asphalt composition for pavement which comprises:
- (a) 82% to 96% by weight of an asphalt;
- (b) 3% to 12% by weight of a Component (A) selected from the group consisting of a styrene-butadiene block copolymer, a styrene-isoprene block copolymer and a styrene-butadiene rubber;
- and
- (c) 1% to 6% by weight of a Component (B) which is a low molecular weight polypropylene having an average molecular weight of 500-10,000, a melting point of 80.degree. C. to 170.degree. C., and a 160.degree. C. viscosity of less than 500 cp.
1 more element
Dependencies are inferred from the claim text.