Carbohydrate esters for using as lubricants
AssigneesSudzucker Aktiengesellschaft, Fuchs Petrolub SE
InventorsMarkwart Kunz, Jörg Kowalczyk, Alireza Haji Begli, Rainer Kohlstrung, Manfred Harperscheid, Angela Kesseler, Rolf Luther, Theo Mang, Christian Puhl, Helena Wagner
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Abstract
The present invention relates to compositions which comprise mixtures of open-chain and cyclic molecules of the sugar alcohols D-sorbitol and D-mannitol which have been esterified with at least one carboxylic acid, processes for preparing these compositions and the use of this composition as lubricant or hydraulic liquid.
Claims58
A composition comprising a mixture of D-sorbitol and its dehydrated derivatives monoanhydrosorbitol and dianhydrosorbitol, and also of D-mannitol and its dehydrated derivatives monoanhydromannitol and dianhydromannitol, these constituents having been esterified with at least one carboxylic acid, wherein the composition has viscosity-temperature behavior, load-bearing capability, cold stability and resistance toward oxidative aging which are suitable for use as a lubricant or hydraulic liquid.
A process for preparing a composition which comprises a mixture of D-sorbitol, D-mannitol and cyclic derivatives thereof, these constituents having been esterified with at least one carboxylic acid, comprising the steps of:
- a) cyclizing D-sorbitol and D-mannitol by dehydration to obtain a mixture of D-sorbitol, D-mannitol, monoanhydrohexitols and dianhydrohexitols, and
- b) partially or fully esterifying the hexitols which have been dehydrated to differing degrees with at least one carboxylic acid, at least one derivative thereof or a mixture thereof, or
- c) carrying out the process as a one-pot reaction with at least one catalyst.
Dependencies are inferred from the claim text.