Mineral oils: processes and products – Products and compositions – Lubricating oils
Reexamination Certificate
2001-07-30
2008-07-22
Mruk, Brian P (Department: 1796)
Mineral oils: processes and products
Products and compositions
Lubricating oils
C510S188000, C510S475000, C508S591000, C526S348000, C585S012000, C585S018000
Reexamination Certificate
active
07402235
ABSTRACT:
A mixture comprising A) a copolymer comprising from about 70 to about 79% by weight of units derived from ethylene, and having (a)Mwmeasured by gel permeation chromatography employing polystyrene standard ranging from about 50,000 up to less than 130,000 and/or (f) SSI≦18; (b) density (D) ranging from about 845 to about 895 kg/m3; (c)Mw/Mnless than 3; (d) melting point (Tm) measured by differential scanning calorimeter ranging from about 15° C. to about 60° C.; and (e) degree of crystallinity≧15%, and B) an amorphous polymer havingMwranging from about 130,000 to about 1,000,000 having degree of crystallinity≦5%. In one embodiment the density and the melting point of the copolymer A) fulfill the expression Tm≦1.247 D−1037. In another embodiment, the percentage content (E: % by weight) of repeating units derived from ethylene and melting point (Tm: ° C.) of the copolymer A) fulfill the expression 3.44E−206≧Tm. Also, additive concentrates and lubricating compositions comprising the components making up the mixture.
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PCT International Application WO 96/17041, Jun. 6, 1996.
Hilker Christopher D.
Mruk Brian P
Shold David M.
The Lubrizol Corporation
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