Surfactant composition

A surfactant composition comprising an alkyl sulfate salt derivative represented by the formula (1) which derivative is produced by steps comprising the following steps (A-I) and (A-II):

• step (A-I):
• a step of adding propylene oxide in an amount exceeding 0 mol and 0.9 mol or less to 1 mol of an alcohol having a straight-chain alkyl group having 8 to 24 carbon atoms;
• and
• step (A-II):
• a step of sulfating the alkoxylate obtained in the above (A-I) and neutralizing the resultant;
• R—O—(PO)n—SO3M (1)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms, PO represents a propylene oxide group, n denotes the average number of added moles of PO and is a number satisfying:
• 0<n≦0.9 and M represents a cation.

A surfactant composition comprising an alkyl sulfate salt derivative (1-1) represented by the following formula (1-1) and an alkyl sulfate salt (2-1) represented by the following formula (2-1), wherein the average number of added moles of propylene oxide in the mixture of the alkyl sulfate salt derivative (1-1) and the alkyl sulfate salt (2-1) exceeds 0 and is 0.9 mol or less based on 1 mol of the alcohol which is the raw material of the above mixture;

• R—O—(PO)m—SO3M (1-1)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms, PO represents a propylene oxide group, m denotes the average number of added moles of PO and is a number exceeding 0 and M represents a cation;
• R—O—SO3M (2-1)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms and M represents a cation.

A surfactant composition comprising an alkyl sulfate salt derivative represented by the formula (1) which derivative is produced by steps comprising the following steps (B-I), (B-II) and (B-III):

• R—O—(PO)n—SO3M (1)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms, PO represents a propylene oxide group, n denotes the average number of added moles of PO and is a number satisfying:
• 0<n≦0.9 and M represents a cation;
• step (B-I):
• a step of adding propylene oxide in an average amount exceeding 0 mol to 1 mol of an alcohol having a straight-chain alkyl group having 8 to 24 carbon atoms;
• step (B-II):
• a step of sulfating the alkoxylate obtained in the above (B-I) and neutralizing the resultant;
• and
• step (B-III):
• a step of blending the alkyl sulfate salt obtained in the above (B-II) and an alkyl sulfate salt represented by the following formula (2);
• R—O—SO3M (2)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms and M represents a cation.

A surfactant composition comprising an alkyl sulfate salt derivative represented by the formula (1) which derivative is produced by steps comprising the following steps (C-I), (C-II) and (C-III):

• R—O—(PO)n—SO3M (1)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms, PO represents a propylene oxide group, n denotes the average number of added moles of PO and is a number satisfying:
• 0<n≦0.9 and M represents a cation;
• step (C-I):
• a step of adding propylene oxide in an average amount exceeding 0 mol to 1 mol of an alcohol having a straight-chain alkyl group having 8 to 24 carbon atoms;
• step (C-II):
• a step of blending the alkoxylate obtained in the above (C-I) with an alcohol represented by the following formula (3);
• R—O—H (3)
• wherein R represents a straight-chain alkyl group having 8 to 24 carbon atoms;
• and
• step (C-III):
• a step of sulfating the above mixture obtained in the above (C-II) and neutralizing them.