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US 8,541,536 B2Granted
Coupling method for providing high molecular weight natural oil polyol
AssigneeMCPU Polymer Engineering, LLC
InventorsThomas M. Garrett, Xian Xian Du
Life of this patent
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Abstract
Methods of coupling plant oil based polyols so as to synthesis high molecular weight plant oil polyols having a hydroxyl number between from about 40 to about 60. The resultant polyols may be directly reacted with polyisocyanates to produce polyurethanes.
Claims12
A process of coupling plant oil based polyols together to produce a plant oil polyol having an increased molecular weight, the process comprising:
- a) forming a mixture including a low molecular weight plant oil polyol having a structure according to scheme (I)
- and an anhydride coupling reagent;
- and
- b) reacting the mixture at a temperature of from about 100° F. to about 250° F. while simultaneously removing water from the mixture for at least three hours, so as to form a plant oil based product polyol having a structure according to scheme (II)
- with a hydroxyl number of between about 50 and 60.
2 more elements
Dependencies are inferred from the claim text.