| Lubricant composition with improved varnish deposit resistance -> Monitor Keywords |
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Lubricant composition with improved varnish deposit resistanceLubricant composition with improved varnish deposit resistance description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20090253597, Lubricant composition with improved varnish deposit resistance. Brief Patent Description - Full Patent Description - Patent Application Claims
Non Provisional Application based on U.S. Ser. No. 61/072,432 filed Mar. 31, 2008 which is based on Patent Memorandum 2006-PL-034. The art or formulating lubricating oil compositions has become more complex as a result of increased government and user environmental standards and increased user performance requirements. Lubricants are typically marketed based upon features such as fluid durability, deposit control, antiwear protection, filterability, water tolerance, rust/corrosion protection, and viscosity. Deposit or varnish is a growing problem in many hydraulic and sensitive lubrication applications, such as gas turbine lubrication. Varnish formation is usually the result of a complex series of events which lead to lubricant degradation. There are two common causes of oil degradation. One cause is oxidation at elevated temperatures leading to the formation of decomposition products, including acids and insoluble particulate, referred to as deposits, varnish, sludge. The second cause is thermal degradation, such as, pressure induced dieseling or micro-dieseling which occurs when entrained air bubbles are collapsed under high pressure. Deposit varnish is measured using a 504 hour 120° C. DRY-TOST sludge test, which is a modified waterless ASTM D943 TOST test. This DRY-TOST test method was developed by Mitsubishi Heavy Industries in order to evaluate in short time the sludge or varnish formation tendency of turbine oils. The Dry-TOST conforms to the ASTM D943 test with the modified conditions shown in the table below. After the 504-hr test period, leave the test tube to stand overnight at room temperature and then measure the deposit amount. The sludge or varnish amount equals to the amount of filter residues that 100 g of oil is filtered through a 1 μm Millipore filter. A sludge amount of less than 100 mg/kg (ppm) is an acceptable result. The table below lists the items and test conditions for this test.
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