The Lubrizol Corporation

Lewis Breon

Chor Huang

A lubricant composition comprising an oil of lubricating viscosity; (A) 0.05 to 1.5 percent by weight of a copolymer comprising 70 to 79 percent by weight of units derived from ethylene ('E'), having aof 50,000 to 100,000,/less than 3, density ('D') of 860 to 896 kg/m, and a melting point (&#x201c;T&#x201d;) of 15&#xb0; C. to 60&#xb0; C., wherein E and Tfulfill the expression3.44&#x2212;206&#x2267;;and (B) 0.05 to 1.5 percent by weight of a block copolymer comprising a first block which comprises a vinyl aromatic comonomer and a second block which comprises a diene comonomer, the diene monomer-containing block being hydrogenated; wherein the weight ratio (A):(B) is 20:80 to 60:40; exhibits good low temperature performance and durability.

Viscosity improver compositions providing improved low temperature characteristics to lubricating oil

A lubricant composition comprising an oil of lubricating viscosity; (A) 0.05 to 1.5 percent by weight of a copolymer comprising 70 to 79 percent by weight of units derived from ethylene ('E'), having aw of 50,000 to 100,000,w/n less than 3, density ('D') of 860 to 896 kg/m, and a melting point (&#x201c;T&#x201d;) of 15&#xb0; C. to 60&#xb0; C., wherein E and Tfulfill the expression3.44206&#x2267;;and (B) 0.05 to 1.5 percent by weight of a block- copolymer comprising a first block which comprises a vinyl aromatic comonomer and a second block which comprises a diene comonomer, the diene monomer-containing block being hydrogenated; wherein the weight ratio (A):(B) is 20:80 to 60:40; exhibits good low temperature performance and durability.

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Aurora, OH, United States of America

Lewis Breon