| abstract |
A mixture comprising A) a copolymer comprising from about 70 to about 79 % by weight of units derived from ethylene, and having (a) M w measured 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) M w/m n less than 3; (d) melting point (T m) 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 having M w ranging 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 T m<= 1.247 D - 1037. In another embodiment, the percentage content (E: % by weight) of repeating units derived from ethylene and melting point (T m: °C) of the copolymer A) fulfill the expression 3.44E - 206 >= T m. Also, additive concentrates and lubricating compositions comprising the components making up the mixture. |