| 摘要 |
<p>An ester composition comprising a plurality of esters derived from a reaction of: a) one or more alcohols, preferably pentaerythritol; and b) (b) three or more C4 to C12 carboxylic acids wherein at least one of said acids is selected from the group consisting of: (i) a branched C8 to C12 acid wherein said acid comprises a backbone having no branching at the C2 position; (ii) a branched C4 to C7 acid; and (iii) a branched C9 to C12 acid wherein said acid comprises a backbone having branching at the C3 position. A preferred acid combination is heptanoic acid, n-octanoic acid (caprylic acid), n-decanoic acid (capric acid) and 3,5,5-trimethylhexanoic acid (isononanoic acid). Also claimed is a dielectric fluid comprising an ester composition as defined above and one or more additives. The one or more additives may be selected from antioxidants, metal deactivators, and pour point depressors. Also claimed is an electrical apparatus comprising a dielectric fluid composition as defined above. Also claimed are methods of manufacturing the ester composition and the dielectric fluid composition. Dielectric fluids according to the present invention may be suitable for use in electric apparatus such as transformers.</p> |
