The purpose of the present invention is to provide an additive for lubricating oil, which does not substantially contain metal elements or the like and is safe but which demonstrates extreme pressure performance equivalent to conventional extreme pressure agents each containing a metal element when used in lubricating applications.
In order to achieve the above-mentioned purpose, the present invention provides a friction and wear reducing agent for lubricating oil consisting of a copolymer (A) comprising an alkyl acrylate (a) represented by the following general formula (1) and a hydroxyalkyl acrylate (b) represented by the following general formula (2) as essential constituent monomers, wherein the constitutive ratio of (a) to (b) is 50/50 to 90/10 (molar ratio) and the weight average molecular weight thereof is 2,000 to less than 40,000.
(in the above formula, R1 represents an alkyl group having 10 to 18 carbon atoms)
(in the above formula, R2 represents an alkylene group having 2 to 4 carbon atoms)
                            本发明的目的是提供一种润滑油添加剂,该添加剂实质上不含
金属元素或类似物,安全可靠,但在润滑应用中使用时,其极压性能与含有
金属元素的常规极压剂相当。
为了实现上述目的,本发明提供了一种用于润滑油的摩擦和磨损减少剂,它由共聚物(A)组成,共聚物(A)由以下通式(1)表示的
丙烯酸烷基酯(a)和以下通式(2)表示的
丙烯酸羟烷基酯(b)作为基本组成单体,其中(a)和(b)的构成比为 50/50 至 90/10(摩尔比),其重量平均分子量为 2,000 至小于 40,000。
(在上式中,R1 代表具有 10 至 18 个碳原子的烷基)。
(在上式中,R2 代表具有 2 至 4 个碳原子的亚烷基)。