Modified fatty acid esters and method of preparation thereof
View Patent ↗A process for the preparation of new polyols and polyesters from a natural oil or other unsaturated fatty acid esters is described. The process involves ozone cleavage of double bonds in the fatty acid chains of the oils along with coupling of a hydroxylated compound such as a mono-alcohol, a diol, or a polyol to the cleaved ends of the molecules resulting from the cleavage with a base. The resulting polyols and polyesters are as intermediates for polymers.
1. A method for making a modified fatty acid ester, the method comprising:
(a) reacting an unsaturated fatty acid ester with ozone in a reaction mixture in the presence of a hydroxylated compound and an alkaline catalyst to form a reaction product,
wherein:
(i) the ozone and the unsaturated fatty acid ester react to cleave double bonds in fatty acid groups of the unsaturated fatty acid ester, and
(ii) the hydroxylated compound, in the presence of the alkaline catalyst, is added to terminal carbons of the cleaved double bonds through an ester covalent bond.
2. The method of claim 1 , wherein the unsaturated fatty acid ester comprises a natural oil triglyceride.
3. The method of claim 2 , wherein the natural oil triglyceride comprises an animal oil triglyceride.
4. The method of claim 3 , wherein the animal oil triglyceride comprises fish oil.
5. The method of claim 2 , wherein the natural oil triglyceride comprises a vegetable oil triglyceride, the vegetable oil triglyceride comprising one or more of soybean oil, safflower oil, linseed oil, corn oil, sunflower oil, olive oil, canola oil, sesame oil, cottonseed oil, palm oil, peanut oil, coconut oil, rapeseed oil, tung oil, and castor oil.
6. The method of claim 1 , wherein the hydroxylated compound has at least two hydroxyl groups.
7. The method of claim 6 , wherein the hydroxylated compound comprises one or more of glycols, linear polyols, glycerin, trimethylol propane, pentaerythritol, glucosides, sugars, and catechols.
8. The method of claim 6 , wherein the hydroxylated compound comprises one or more of ethylene glycol, 1,2-propylene glycol, 1,3-propylene glycol, 1,2-butylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,2-pentylene glycol, 1,3-pentylene glycol, 1,4-pentylene glycol, 1,5-pentylene glycol, neopentyl glycol, and hexane diols.
9. The method of claim 1 , wherein the hydroxylated compound comprises a mono-alcohol.
10. The method of claim 9 , wherein the mono-alcohol comprises one or more of a linear hydrocarbon chain, a branched hydrocarbon chain, and combinations thereof.
11. The method of claim 1 , wherein the alkaline catalyst comprises one or more of an alkali metal hydroxide, an organic amine, a salt derived from a strong base and a weak acid, and a metal oxide having an alkaline surface.
12. The method of claim 1 , wherein the reaction product comprises:
(a) a modified fatty acid ester comprising: an ester of an alkaline-catalyzed, ozone-cleaved unsaturated fatty acid ester comprising a terminal carbon atom, wherein the terminal carbon atom is covalently linked through an ester reaction product of (i) the alkaline-catalyzed, ozone-cleaved unsaturated fatty acid and (ii) the a hydroxylated compound.
13. The method of claim 12 , wherein the reaction product further comprises:
(b) one or more of diesters and monoesters resulting from the reaction of the hydroxylated compound with cleaved portions of the fatty acid groups of the fatty acid ester.
14. A composition derived from a fatty acid ester, the composition comprising:
(a) a modified fatty acid ester comprising: an ester of an alkaline-catalyzed, ozone-cleaved unsaturated fatty acid ester comprising a terminal carbon atom, wherein the terminal carbon atom is covalently linked through an ester reaction product of (i) the alkaline-catalyzed, ozone-cleaved unsaturated fatty acid and (ii) the hydroxylated compound.
15. The composition of claim 14 , wherein the unsaturated fatty acid ester comprises a natural oil triglyceride.
16. The composition of claim 15 , wherein the modified fatty acid ester comprises more than three ester groups per triglyceride molecule.
17. The composition of claim 14 , wherein the hydroxylated compound has at least two hydroxyl groups.
18. The composition of claim 17 , wherein the modified fatty acid ester comprises primary alcohol groups.
19. The composition of claim 14 , wherein the hydroxylated compound comprises a mono-alcohol.
20. The composition of claim 14 , further comprising: (b) one or more of diesters and monoesters resulting from the reaction of the hydroxylated compound with cleaved portions of the fatty acid groups of the fatty acid ester.
21. A method of making a natural oil-based primary polyol, the method comprising ozonizing a natural oil in the presence of a polyol and an alkaline catalyst.
22. The composition of claim 15 , wherein the natural oil triglyceride comprises a vegetable oil triglyceride, the vegetable oil triglyceride comprising one or more of soybean oil, safflower oil, linseed oil, corn oil, sunflower oil, olive oil, canola oil, sesame oil, cottonseed oil, palm oil, peanut oil, coconut oil, rapeseed oil, tung oil, and castor oil.