| 摘要 |
<p>A lubricating oil composition comprising: (a) a lubricating oil; and (b) a hydrogenated asymmetric radial polymer, molecules of which have a core composed of the remnant of a tetravalant silicon coupling agent, a plurality of rubbery arms comprising polymerized diene units and a block copolymer arm having at least one polymerized diene block and a polymerized monovinyl aromatic compound block; said monovinyl aromatic block having a molecular weight within the range of 20,000-50,000, said polymerized diene block of said block copolymer arm having a molecular weight which is equal to or lower than the molecular weight of each of said rubbery arms, and wherein said molecules are predominantly made up of three of said rubbery arms and one of said block copolymer arms, and an additive concentrate comprising such an asymmetric radial polymer.</p> |
