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 lubricating oil compositions which exhibit high wear 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 no more than about 600 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 no more than about 800 ppm of molybdenum, based upon the total mass of the composition, wherein the lubricating oil composition has a ratio of sulfur to molybdenum of about 5:1 to about 500:1. 【課題】高い摩耗防止能力を示す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ＡＳＴＭ Ｄ８７４で測定した硫酸灰分が約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約６００ｐｐｍ以下となる量の、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約８００ｐｐｍ以下となる量の、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５：１乃至約５００：１である。【選択図】なし