Hydrogenated tapered-block copolymers of conjugated dienes...

Details Hydrogenated tapered-block copolymers of conjugated dienes... Hydrogenated tapered-block copolymers of conjugated dienes...

C - Chemistry, Metallurgy

10

M

253/128

C10M 1/18 (1980.01)

Patent

CA 1097322

ABSTRACT OF THE DISCLOSURE A hydrogenated, tapered-block copolymer produced by copolymerization of at least two conjugated dienes, such as isoprene and butadiene; and a vinyl aromatic monomer, such as tyrene, upon addition to lubricating oils provides viscosity index improvement, oxidative and shear stability and enhanced visco- metric properties. When the butadiene content ranges from about 0.1 to about 10 mol. percent said tapered-block copolymer provides excellent low temperature viscometrics when dissolved into a lubricating oil composition containing an oil- soluble dispersant.

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