Softener composition

A method of preparing quaternary ammonium salts represented by the following formula (I), (II) or (III), reacting a tertiary amine represented by the following formula (V), (VI) or (VII) with a quaternizing agent selected from the group consisting of dimethylsulfate. diethylsulfate and methyichioride, to prepare quaternary ammonium salts in at least one aprotic solvent selected from the group consisting of ketone compounds, hydrocarbon compounds, heterocyclic compounds and compounds represented by the following formula (XII):

• wherein R1 , R2 and R3 represent a long-chain alkyl or alkenyl group having the total carbon atoms of 8 to 40, which are the same as or different from one another and may be intersected by an ether group, an ester group or an amide group, R4 represents an alkyl group, an ailcenyl group or a hydroxy alkyl group, having 1 to 6 carbon atoms, plural R4's being the same as or different from one another, and X−represents an anionic group,
• wherein R1, R2, R3 and R4 are the same as described above,
• R11O-(AO)n-R12
• wherein R11 and R12, which are the same as or different from each other, represent an alkyl group, an alkenyl group or an acyl groups, each having 1 to 30 carbon atoms, A represents an alkylene group having 2 to 4 carbon atoms, n represents a number of 1 to 40 in the average value and n A's may be the same as or different from one another.