Low volatile, epoxidized plasticizer composition with low levels of organic volatiles

A method of making low volatile, epoxidized plasticizer composition comprising:

• providing one or more epoxidized fatty acid esters having at least 4% saturates, and one or more epoxidized bio-based oil;
• forming a blend of the one or more epoxidized fatty acid esters and the one or more epoxidized bio-based oils;
• hydrothermally treating the one or more epoxidized fatty acid esters and one or more epoxidized bio-based oil either before or after the blend is formed at conditions sufficient to remove at least 80% of organic volatiles while maintaining at least 4% saturates in the one or more epoxidized fatty acid esters, wherein the method results in a weight loss of epoxidized oils of 2% or less.

A plasticized polymer composition comprising one or more polymers and at least one low volatile, epoxidized plasticizer homogeneously dispersed within the polymer composition, wherein the plasticizer is at least 80% free of organic volatiles, and comprises a blend of:

• a) one or more epoxidized fatty acid esters having at least 4% saturates;
• and
• b) one or more epoxidized bio-based oil.