Composition containing a modified hydroxyalkyl cellulose

A composition, comprising:

• a modified hydroxyalkyl cellulose (A);
• and
• a cationic surfactant (B),
• wherein:
• the modified hydroxyalkyl cellulose (A) has a cationic group and a hydrophobic group represented by a formula (1), each of which is bound to a group resulting from eliminating a hydrogen atom from a hydroxy group of a hydroxyalkyl cellulose;
• a degree of substitution of the hydroxyalkyl group in the hydroxyalkyl cellulose is 0.1 or more and 3 or less;
• and
• a content of the cationic surfactant (B) is more than 1 part by mass and 1,500 parts by mass or less relative to 1 part by mass of the modified hydroxyalkyl cellulose (A):
• *—Z—R1 (1)
• wherein:
• Z represents a single bond or a hydrocarbon group having an oxygen atom;
• R1 represents a hydrocarbon group having 2 or more and 12 or less carbon atoms;
• * in formula (1) represents a binding position to a group resulting from eliminating a hydrogen atom from a hydroxy group of the hydroxyalkyl cellulose;
• a degree of substitution of the hydrophobic group represented by the formula (1) in the modified hydroxyalkyl cellulose (A) is 0.0001 or more and 1 or less, and
• the hydrophobic group represented by the formula (1) is any hydrophobic group represented by formulae (1-1), (1-1′), (1-2), and (1-2′);
• wherein:
• R11's each independently represent an alkylene group having 2 to 4 carbon atoms;
• R1 in formulae (1-1), (1-1′), (1-2), and (1-2′) is synonymous with R1 in the formula (1);
• n1 represents an addition molar number of —R11—O—, and n1 is an integer of 0 or more and 30 or less:
• and
• * in formulae (1-1), (1-1′), (1-2), and (1-2′) is synonymous with * in the formula (1).