The following three patents cover the techniques for making industrial lubricants with enhanced heat stability by interesterification of an antioxidant with various natural oils such as coconut oil or synthetic esters such as glycerol tricaprylate and pentaerythritol tetrapelargonate.
U.S. Patent number 5,614,648
U.S. Patent number 5,380,890
U.S. Patent number 5,155,244
Visit the IBM patent server to view these patents.