Bituminous composition

Details Bituminous composition Bituminous composition

2007-09-18

2007-09-18

Smith, Duane (Department: 1724)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Processes of preparing a desired or intentional composition...

C524S068000, C524S071000, C524S505000, C525S271000, C525S250000, C525S314000, C523S222000

Reexamination Certificate

active

10508908

ABSTRACT:
A bituminous composition which comprises a bituminous component and a block copolymer which comprises at least two blocks of a conjugated diene and at least two blocks of a monovinylaromatic hydrocarbon, being of the general formula: S1—B1—S2—B2wherein B1is a block of polymerized conjugated diene comprising at least 50 mole % isoprene having an apparent molecular weight of from 180,000 to 400,000, S1and S2are blocks of polymerized monovinylaromatic hydrocarbon having a weight average molecular weight of 12,000 to 40,000, and B2is a block of polymerized conjugated diene comprising at least 50 mole % isoprene having an apparent molecular weight of from 15,000 to 60,000; wherein the weight ratio W of B1over B2is in the range of 3.0 to 12.0; and wherein the content of polymerized monovinylaromatic hydrocarbon is in the range from 10 to 35 wt. %.

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