Unilever Patent Holdings B.v.

Emery Industries, Inc.

Unichema Chemie B.v.

Gijsbert Van Der Waal

Dirk Kenbeek

Arie Dick Kardol

Ramires Rolando Poulina

Adrianus Trapman

Cornelis Verboom

An ester resulting from an esterification reaction between at least one polyfunctional alcohol and at least one polyfunctional carboxylic acid using a chain stopping agent to form ester bonds with the remaining hydroxyl or carboxyl groups is disclosed. The polyfunctional carboxylic acid comprises an aliphatic dicarboxylic acid containing from 9 to 18 carbon atoms, dimerised and/or trimerised fatty acids or mixtures thereof, with the proviso that dimerised and trimerised fatty acids do not constitute more than 80% by weight of the total amount of polyfunctional carboxylic acid used. The chain stopping agent may be a monocarboxylic acid or a monofuntional alcohol having at least 14 carbon atoms. The complex esters have a kinematic viscosity at 100 C of from 30 to 1000 cSt, preferably from 30 to 200 cSt. The complex ester is useful &ldquo;as is&rdquo; or as an additive and/or as a base fluid and/or a thickener in transmission oils, hydraulic fluids, four-stroke oils, fuel additives, compressor oils, grease, chain oils and for metal working metal rolling applications. A multigrade gear oil formulation comprising one of more of the above complex esters is also part of the invention.

Complex esters, formulations comprising these esters and use thereof

The invention provides a polyester based on dimeric fatty acid, a glycol without hydrogen atoms at an alpha carbon atom in which a C3-C12 monoalcohol chainstopper is present and which contains approximately equivalent quantities of acid and alcohol groups. Preferably the dimer acid contains 36 carbon atoms and the monoalcohol is a branched chain C6-C10 alkanol. The invention also provides lubricant compositions comprising 30-2% (w.w.) of the polyester and 70-98% (w.w.) of an synthetic lubricant base.

Polyester viscosity index improver

Improved water-emulsifiable ester lubricants for polymeric and metal materials are provided which yield stable emulsions even in the absence of emulsifying agents. The ester lubricants are obtainable from a higher molecular weight di- or polycarboxylic acid and a polyalkoxylated lower alkyl alcohol.

Mixed synthetic ester lubricants as useful polymeric fiber lubricants

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Bergambacht, Netherlands

Gijsbert Van Der Waal