USH1250HExpiredUtility

Modification of asphalt

Assignee: SHELL OIL COPriority: Jul 6, 1992Filed: Jul 6, 1992Granted: Nov 2, 1993

Est. expiryJul 6, 2012(expired)· nominal 20-yr term from priority

Inventors:Dennis W. Gilmore Anne R. Spell Richard Gelles James H. Collins Mark A. Berggren Mark G. Bouldin

C08L 95/00

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Claims

Abstract

A bituminous composition comprising: (a) a bitumen, (b) a block copolymer of at least one conjugated diolefin and at least one vinyl aromatic hydrocarbon, and (c) a thermoplastic or low crystallinity polymer.

Claims

exact text as granted — not AI-modified

We claim: 
     
       1. A bituminous composition comprising: (a) a bitumen,   (b) at least 0.1 but less than 4 wt % of a block copolymer of at least one conjugated diolefin and at least one vinyl aromatic hydrocarbon, and   (c) from 0.1 to 15 wt % of a thermoplastic polymer.   
     
     
       2. A bituminous composition comprising: (a) a bitumen,   (b) from 0.1 to 8 wt % of a block copolymer of at least one conjugated diolefin and at least one vinyl aromatic hydrocarbon, and   (c from 0.1 to less than 20 wt % of a low crystallinity polymer which contains less than 40% crystallinity.   
     
     
       3. The composition of claim 2 wherein the low crystallinity polymer is atactic polypropylene and the block copolymer is a hydrogenated styrene-butadiene-styrene block copolymer.

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