A dispersant for a lubricating oil, containing at least one compound selected from a specific nitrogen-containing compound which is obtained by using, as raw materials, (A) at least one polyolefin selected from polybutene and polyisobutene, (B) at least one maleic acid compound selected from maleic acid and maleic anhydride, and (C) polyamine; a boride of the specific nitrogen-containing compound; and an acylated product of the specific nitrogen-containing compound. The polyolefin (A) satisfies at least one of the following conditions (α) and (β). (α) a ratio (Sb/Sa) of an integrated value (Sb) of a peak present at 4.40 to 5.00 ppm in a 1H-NMR spectrum to an integrated value (Sa) of a peak present at 5.01 to 5.60 ppm in the 1H-NMR spectrum is 2 or more. (β) a ratio (Sd/Sc) of an integrated value (Sd) of a peak present at 1.76 to 2.10 ppm in the 1H-NMR spectrum to an integrated value (Sc) of a peak present at 1.65 to 1.75 ppm in the 1H-NMR spectrum is 1 or more.
一种用于润滑油的分散剂,含有至少一种选自特定
含氮化合物的化合物,该特定
含氮化合物通过使用以下原料获得:(A) 至少一种选自聚
丁烯和聚
异丁烯的聚烯烃;(B) 至少一种选自
马来酸和
马来酸酐的
马来酸化合物;(C) 聚胺;特定
含氮化合物的
硼化物;以及特定
含氮化合物的酰化产物。聚烯烃 (A) 至少满足以下条件之一 (α)和 (β)。(α) 1H-NMR 光谱中 4.40 至 5.00 ppm 处出现的峰的综合值 (Sb) 与 1H-NMR 光谱中 5.01 至 5.60 ppm 处出现的峰的综合值 (Sa) 之比 (Sb/Sa) 为 2 或以上。(β) 存在于 1H-NMR 光谱中 1.76 至 2.10 ppm 处的峰的综合值 (Sd) 与存在于 1H-NMR 光谱中 1.65 至 1.75 ppm 处的峰的综合值 (Sc) 之比 (Sd/Sc) 为 1 或以上。