Patent ID: 8362289

Claim:
A method of obtaining a liquid mixture for transferring carbon dioxide, comprising reacting gaseous carbon dioxide with an alkyltin alkoxide at a temperature in a range of from −60° C. to 100° C., forming a carbon dioxide complex of an alkyltin alkoxide, and preparing a liquid mixture comprising an alkyltin alkoxide composition containing an alkyltin alkoxide, the carbon dioxide complex, and a tetraalkyldialkoxydistannoxane; and carbon dioxide; wherein taking the number of mols of tin atoms in the alkyltin alkoxide and/or the carbon dioxide complex of the alkyltin alkoxide contained in the mixture to be Z, taking carbon dioxide incorporated in the carbon dioxide complex of the alkyltin alkoxide, and carbon dioxide contained in the mixture to be (CO 2 ), and taking OR groups contained in the mixture to be (OR), wherein O in each of the OR groups represents an oxygen atom, and R represents an aliphatic group or an aralkyl group, being (i) R of an OR group forming a tin-OR linkage and/or (ii) R of an OR group forming an —O—(CO)—OR linkage in the carbon dioxide complex of the alkyltin alkoxide, in a relationship Z:(CO 2 ) x :(OR) y , a molar proportion represented by Z is 1, a molar proportion represented by x is in a range of from 0.1 to 2, and a molar proportion represented by y is in a range of from 0.5 to 2.