Process for production of polyethers and polymers
AssigneeKaneka Corporation
InventorHideharu Jono
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Abstract
The invention aims at providing a process of subjecting a polyether polymer containing a double metal cyanide complex and/or residue compounds thereof as the metallic impurities to extraction with water to thereby remove the metallic impurities, which enables simpler and complete removal of the impurities; and polyether polymers obtained by the process. This aim is attained by a process for the purification of polyethers characterized by blending (A) a polyether containing a double metal cyanide complex and/or residue compounds thereof with ascorbic acid or a derivative thereof and water and then removing the aqueous phase from the resulting mixture to thereby remove the double metal cyanide and/or the residue compounds.
Claims13
A method of producing a polyether, including a purification step, characterized by removing double metal cyanide complex and/or the residual compound thereof by water extraction, wherein the method comprises:
- adding ascorbic acid or the derivative thereof and water to a polyether (A) containing double metal cyanide complex and/or the residual compound thereof;
- separating the resulting mixture to aqueous phase and organic phase, and removing the aqueous phase from the mixture.
A method of producing an unsaturated group-containing polyether, including a purification step, characterized by removing double metal cyanide complex and/or the residual compound thereof by water extraction, wherein the method comprises:
- adding ascorbic acid or the derivative thereof and water to an unsaturated group-containing polyether (B) containing a double metal cyanide complex and/or the residual compound thereof;
- separating the resulting mixture to aqueous phase and organic phase, and removing the aqueous phase from the mixture.
A method of producing a polyether, including a purification step, characterized by removing double metal cyanide complex and/or the residual compound thereof by water extraction, wherein the method comprises:
- adding an organic solvent and ascorbic acid or the derivative thereof and water to a polyether (A) containing double metal cyanide complex and/or the residual compound thereof, separating the resulting mixture to aqueous phase and organic phase, and removing the aqueous phase from the mixture.
A method of producing a polyether, including a purification step, characterized by removing double metal cyanide complex and/or the residual compound thereof by water extraction, wherein the method comprises:
- adding an organic solvent and ascorbic acid or the derivative thereof and water to an unsaturated group-containing polyether (B) containing a double metal cyanide complex and/or the residual compound thereof, separating the mixture to aqueous phase, and organic phase and removing the aqueous phase from the mixture.
Dependencies are inferred from the claim text.