Patent ID: 7622519
Filing Date: 2009-11-24
Classification: C08F,C08L

Abstract:
1. A process for preparing a polymer modified bituminous binder composition in the substantial absence of crosslinking agents, said process comprising the steps of: (a) heating a bitumen component in a stirred tank to a temperature from 160° C. to 221° C.; (b) adding a block copolymer composition to the bitumen component while the bitumen component is being stirred to form a homogeneous mixture of the bitumen component and the block copolymer composition; and (c) continuing to stir the homogeneous mixture at a temperature from 180° C. to 221° C. for a total period of time from 2 hours to 30 hours thereby forming a cured polymer modified bituminous binder composition; wherein said block copolymer composition comprises (ii) optionally one or more block copolymers of the formula (S-B1-B2)