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US 5,288,773 AGranted
Sulfonated unhydrogenated copolymers of styrene and butadiene
AssigneeExxon Research & Engineering Co.
InventorsMartin L. Gorbaty, Dennis G. Peiffer
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AssigneeExxon Research & Engineering Co.
InventorsMartin L. Gorbaty, Dennis G. Peiffer
Estimating the term…
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.
A sulfonated polymer composition comprising a sulfonated block copolymer of (poly)styrene and a conjugated diene having a sulfonation level below which the copolymer is water swellable, the (poly)conjugated diene having less than about 25% of the olefinic unsaturation in the starting block copolymer saturated, and base neutralized forms of the sulfonated block copolymer, and wherein the starting block copolymer is selected from the group consisting of linear diblock, linear triblock, and radial triblock, and wherein the (poly)conjugated diene is selected from the group consisting of (poly)isoprene and (poly)butadiene, the sulfonated block copolymer having less than 0.8% weight of bound sulfur.
A process for the preparation of a sulfonated block copolymer, which comprises:
A polymer-modified asphaltic composition comprising a neutral blend of an asphalt and a sulfonated block copolymer of (poly)styrene and (poly)conjugated diene, wherein less than about 25% of the olefinic unsaturation in the starting copolymer is saturated, and wherein the conjugated diene is selected from the group consisting of (poly)isoprene and (poly)butadiene in an amount of from about 2 wt. % to about 7 wt % of the total asphaltic composition, and wherein the sulfonated block copolymer has less than 1 wt % of bound sulfur.
Dependencies are inferred from the claim text.