ADDITIVE CONCENTRATES FOR FORMULATION OF LUBRICATING OIL COMPOSITIONS

PROBLEM TO BE SOLVED: To provide storage stable additive concentrates for formulation of lubricating oil compositions.SOLUTION: A lubricant additive concentrate contains (i) a dispersant that is the polybutenyl succinimide reaction product; (ii) an overbased magnesium colloidal detergent having a total base number (TBN) of about 300 to about 900 mg KOH/g; and an organic friction modifier containing an organic friction modifier (iii). The combined mass percentage of the dispersant (i) and the overbased magnesium colloidal detergent (ii) in the concentrate is about 15 to about 50 mass%; the mass ratio of (i):(ii) is about 1:1 to about 6:1; and the concentrate contains about 2 to about 10 mass% of the organic friction modifier (iii). The remainder of the concentrate is composed of a base oil and additives other than the dispersant (i), the overbased magnesium colloidal detergent (ii) and the organic friction modifier (iii).SELECTED DRAWING: None 【課題】潤滑油組成物を配合するための保存安定性添加剤濃縮物を提供する。【解決手段】(i) ポリブテニルスクシンイミド反応生成物である分散剤；(ii) 約300〜約900mg KOH/gという全塩基価(TBN)を持つ過塩基化マグネシウムコロイド状洗浄剤；および有機摩擦調整剤(iii)を含む有機摩擦調整剤を含有し、該濃縮物における分散剤(i)および過塩基化マグネシウムコロイド状洗浄剤(ii)の総計質量％は、約15〜約50質量％であり；(i):(ii)の質量比は、約1:1〜約6:1であり；かつ該濃縮物は、約2質量％〜約10質量％の有機摩擦調整剤(iii)を含み、該濃縮物の残部は、ベースオイルおよび分散剤(i)、過塩基化マグネシウムコロイド状洗浄剤(ii)および有機摩擦調整剤(iii)以外の添加剤を含む潤滑油添加剤濃縮物に関する。【選択図】なし