LUBRICATING OIL COMPOSITIONS

• Main Authors: BOFFA ALEXANDER B, CHERPECK RICHARD E, JAMES A MCGEEHAN, STEPHEN D STULTS, WIM VAN DAM, NELSON KENNETH D, WILLIAM M KLEISER
• Format: Patent
• Language: English; Japanese
• Published: 16.04.2015
• Subjects: CHEMISTRY; FUELS; LUBRICANTS; LUBRICATING COMPOSITIONS; METALLURGY; PEAT; PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATINGINGREDIENTS IN A LUBRICATING COMPOSITION

PROBLEM TO BE SOLVED: To provide low ash lubricating oil compositions which exhibit high wear and oxidation inhibition performance.SOLUTION: A lubricating oil composition having a sulfur content of up to about 0.4 wt.% and a sulfated ash content of up to about 0.5 wt.% as determined by ASTM D874 is disclosed which comprises: (a) a major amount of an oil of lubricating viscosity; (b) at least one oil-soluble or dispersed oil-stable boron-containing compound having greater than 400 ppm of boron, based upon the total mass of the composition; and (c) at least one oil-soluble or dispersed oil-stable molybdenum-containing compound having at least about 1,100 ppm of molybdenum, based upon the total mass of the composition, wherein the lubricating oil composition has a ratio of sulfur to molybdenum of less than or equal to about 4:1. 【課題】高い摩耗および酸化防止能力を示す低灰分潤滑油組成物を提供する。【解決手段】硫黄分が約０．４質量％以下、かつ硫酸灰分がＡＳＴＭ Ｄ８７４で測定して約０．５質量％以下の潤滑油組成物であって、（ａ）主要量の潤滑粘度の油、（ｂ）組成物の全質量に基づくホウ素量が４００ｐｐｍより多くなる量の、少なくとも一種の油溶性又は分散性の油中で安定なホウ素含有化合物、および（ｃ）組成物の全質量に基づくモリブデン量が少なくとも約１１００ｐｐｍとなる量の、少なくとも一種の油溶性又は分散性の油中で安定なモリブデン含有化合物を含む潤滑油組成物、ただし、潤滑油組成物の硫黄対モリブデン比は約４：１以下である。【選択図】なし