Sulfonated unhydrogenated copolymers of styrene and butadiene

Details Sulfonated unhydrogenated copolymers of styrene and butadiene Sulfonated unhydrogenated copolymers of styrene and butadiene

C - Chemistry, Metallurgy

08

F

C08F 297/00 (2006.01) C08F 8/36 (2006.01) C08L 25/10 (2006.01) C08L 53/02 (2006.01) C08L 95/00 (2006.01)

Patent

CA 2103875

This invention relates to polymeric compositions comprising unhydrogenated or substantially unhydrogenated sulfonated copolymers of (poly)styrene and a (poly)conjugated diene, e.g., (poly)butadiene or (poly)isoprene, preferably (poly)butadiene containing less than about 1.0 wt.%, preferably less than about 0.8 wt.% sulfur, preferably from about 0.2 to about 0.7, more preferably from about 0.22 to about 0.6 wt.% sulfur, as well as base-neutralized products thereof. The invention includes the polymeric compositions produced by the process of sulfonating unhydrogenated copolymers of (poly)styrene and a conjugated diene, e.g., (poly)butadiene or {poly)isoprene, preferably (poly)butadiene, which process optionally includes base neutralizing the sulfonated copolymer. This invention further relates to the process for making these novel copolymers comprising combining an unhydrogenated or substantially unhydrogenated copolymer of (poly)styrene and a conjugated diene, e.g., (poly)butadiene or (poly)isoprene, preferably (poly)butadiene and an effective amount of sulfonating agent in an amount for a time, temperature and under conditions sufficient to sulfonate the copolymer and, optionally, neutralizing the sulfonated copolymer. This invention uses the copolymers herein in block form, i.e., diblock; (linear or radial) triblock, multiblock. The copolymers of the present invention, particularly sulfo- nated radial block copolymers of poly(styrene)-poly(butadiene)- (poly)styrene (S-B-S), have utility as asphalt additives. They have been used herein to produce novel polymer modified asphaltic composi- tions that are storage stable to which the invention also relates.

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