PROCESS FOR MAKING CERTAIN EPOXIDIZED FATTY ACID ESTER PLASTICIZERS
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United States of America Patent
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Issued Date -
Aug 13, 2015
app pub date -
Feb 12, 2014
filing date -
Feb 12, 2014
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Abstract
A process is described for making an epoxidized fatty acid ester material useful as a plasticizer for flexible PVC applications, comprising: transesterifying a low moisture epoxidized natural fat or oil with a first alcohol in a first transesterification step; then, after the resultant product mixture phase separates into an epoxidized fatty acid ester phase and a second phase comprising byproduct glycerol, substantially removing the second phase; combining epoxidized fatty acid esters in the epoxidized fatty acid ester phase with more of the first alcohol and with a second alcohol which includes 5 to 7 members in a ring structure and carrying out a second transesterification step, while continuously removing first alcohol during the second transesterification step in order to drive the reaction with the second alcohol toward the desired epoxidized fatty acid ester material from the second alcohol, but without large molar excesses of the second alcohol being required.
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