Polyether carbonate polyols made via double metal cyanide (DMC) catalysis
View Patent ↗The present invention relates to a polyether carbonate polyol made by copolymerizing a starter molecule with carbon dioxide, at a pressure ranging from about 10 psia to about 2,000 psia, and an alkylene oxide, at a temperature ranging from about 50° C. to about 190° C. and in the presence of from about 0.001 wt. % to about 0.2 wt. % of a substantially non-crystalline double metal cyanide (DMC) catalyst, wherein the polyol has an incorporated carbon dioxide content of from about 1 wt. % to about 40 wt. %, wherein the ratio of cyclic carbonate by-product to total carbonate is less than about 0.3 and wherein the weight percentages are based on the weight of the polyol. The inventive polyether carbonate polyols may find use in producing polyurethane foams, elastomers, coatings, sealants and adhesives with improved properties.
1. A process for producing a polyether carbonate polyol comprising:
copolymerizing a starter molecule with carbon dioxide, at a pressure ranging from about 10 psia to about 2,000 psia, and an alkylene oxide, at a temperature ranging from about 50° C. to about 190° C., in the presence of from about 0.001 wt. % to about 0.2 wt. % of a substantially non-crystalline double metal cyanide (DMC) catalyst, wherein the resultant polyether carbonate polyol has an incorporated carbon dioxide content of from about 1 wt. % to about 40 wt. %, wherein the ratio of cyclic carbonate by-product to total carbonate is less than about 0.3 and wherein the weight percentages are based on the weight of the polyol.
2. The process according to claim 1 , wherein the starter molecule is chosen from C 1 -C 30 monols, ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, neopentyl glycol, 1,3 propanediol, 1,4 butanediol, 1,2 butanediol, 1,3 butanediol, 2,3 butanediol, 1,6 hexanediol, water, glycerin, trimethylolpropane, trimethylolethane, pentaerythritol, α-methylglucoside, sorbitol, mannitol, hydroxymethylglucoside, hydroxypropyiglucoside, sucrose, 1,4-cyclohexanediol, cyclohexanedimethanol, hydroquinone, resorcinol and alkoxylates thereof.
3. The process according to claim 1 , wherein the starter molecule is chosen from alkoxylated oligomers of ethylene glycol, propylene glycol, glycerin and trimethylolpropane.
4. The process according to claim 1 , wherein the starter molecule is added prior to the alkylene oxide.
5. The process according to claim 1 , wherein the alkylene oxide is chosen from ethylene oxide, propylene oxide, 1,2-butylene oxide, 2,3-butylene oxide, isobutylene oxide, epichlorohydrin, cyclohexene oxide, styrene oxide, C 5 -C 30 α-alkylene oxides, polycarboxylic anhydrides and lactones and mixtures thereof.
6. The process according to claim 1 , wherein the alkylene oxide is propylene oxide.
7. The process according to claim 3 , wherein the polyol has an incorporated carbon dioxide content of from about 1 wt. % to about 20 wt. %.
8. The process according to claim 1 , wherein the ratio of cyclic carbonate by-product to total carbonate is less than about 0.15.
9. The process according to claim 1 , wherein the substantially non-crystalline double metal cyanide (DMC) catalyst is a zinc hexacyanocobaltate.
10. The process according to claim 1 , wherein the carbon dioxide pressure ranges from about 40 psia to about 150 psia.
11. The process according to claim 1 , wherein the temperature ranges from about 60° C. to about 140° C.
12. The process according to claim 1 , in which the process comprises adding an amount of a continuously added starter (S c ), and an amount of an initially charged starter (S i ), wherein the S c comprises at least 2 eq. % of the total starter used; and wherein the alkylene oxide and S c are continuously added to the reaction during copolymerization.
13. The process according to claim 12 , wherein the alkylene oxide, carbon dioxide and S c are continuously added to the reaction during copolymerization.
14. The process of claim 1 , wherein the starter molecule is added continuously during the copolymerization.