| abstract |
A mixture comprising A) a copolymer comprising from about 70 to about 79 % by weight of units derived from ethylene, and having (a) Mw 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?/mn less 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 having Mw 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 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. |