| abstract |
IMPROVED MINERAL OIL COMPOSITIONS COMPRISING A NEUTRAL, NON-VOLATILE, MINERAL OIL, A POUR POINT DEPRESSANT AND A VISCOSITY INDEX IMPROVER CONSISTING OF AN OIL-SOLUBLE, SUBSTANTIALLY LINEAR, HYDROCARBON COPOLYMER CONTAINING 25 TO 55 WEIGHT PERCENT POLYMERIZED ETHYLENE UNITS AND 75 TO 45 WEIGHT PERCENT POLYMERIZED COMONOMER UNITS, SAID CONNONOMER SELECTED FROM THE GROUP CONSISTING OF TERMINALLY UNSATURATED STRAIGHT CHAIN MONOOLEFINS OF 3 TO 12 CARBON ATOMS, W-PHENYL-1-ALKENES OF 9 TO 10 CARBON ATOMS, 2-NORBORNENE, TERMINALLY UNSATURATED NON-CONJUGATED DIOLEFINS OF 5 TO 8 CARBON ATOMS, DICYCLOPENTADIENE. 5-METHYLENE-2-NORBORNENE, AND MIXTURES THEREOF, SAID COPOLYMER HAVING A PENDENT INDEX OF ABOUT 18 TO 33, AN AVERAGE PENDENT SIZE NOT EXCEEDING 10 CARBON ATOMS, AN AVERAGE CHAIN LENGTH OF 2,700 TO 8,800 CARBON ATOMS AND AN INHERENT VISCOSITY OF ABOUT 0.7 TO 1.8 AS MEASURED ON A 0.1 WEIGHT PERCENT SOLUTION IN TETRACHLOROETHYLENE AT 30*C. |