Soy-based polyols
The invention provides processes for preparing soy-based oligomeric polyols or substituted oligomeric polyols, as well as urethane bioelasteromers comprising the oligomeric polyols or substituted oligomeric polyols.
1. A process for preparing an oligomeric polyol, the process comprising contacting an epoxidized triglyceride having a viscosity of about 3,000 to about 6,000 cP at 22° C. with a hydroxyl-containing reactant in the presence of an aromatic sulfonic acid to form the oligomeric polymer, the oligomeric polymer having a hydroxyl value of at least 100 mg KOH/g.
2. The process of claim 1 , wherein the epoxidized triglyceride is derived from soybean oil, and wherein about 20% to 100% of the double bonds of the epoxidized triglyceride comprise an oxirane ring.
3. The process of claim 2 , wherein about 60% to 90% of the double bonds of the epoxidized triglyceride comprise an oxirane ring.
4. The process of claim 2 , wherein epoxidized triglyceride has an epoxy content of about 5% to about 6.5%.
5. The process of claim 1 , wherein the epoxidized triglyceride has a viscosity of about 3,500 to about 4,500 cP at 22° C.
6. The process of claim 1 , wherein the hydroxyl-containing reactant is chosen from an alcohol and a diacid.
7. The process of claim 6 , wherein the alcohol is a diol chosen from ethylene glycol, propylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol.
8. The process of claim 1 , wherein the aromatic sulfonic acid is chosen from p-toluenesulfonic acid and benzenesulfonic acid.
9. The process of claim 1 , wherein the molar ratio of the epoxidized triglyceride to the hydroxyl-containing reagent to the aromatic sulfonic acid is about 1:0.1:0.005 to about 1:3:0.2; and the process is conducted at a temperature of about 100° C. to about 240° C.
10. The process of claim 1 , wherein the hydroxyl-containing reactant is ethylene glycol; the aromatic sulfonic acid is p-toluenesulfonic acid; the molar ratio of epoxidized triglyceride to ethylene glycol to p-toluenesulfonic acid is about 1:0.4:0.02 to about 1:0.8:0.05; and the process is conducted at a temperature of about 130° C. to about 160° C.