Water-soluble film and method for manufacturing same

A composition comprising:

• a polymer containing an anionic group other than a sulfonic acid (salt) group;
• and
• a water-soluble resin,
• the anionic group-containing polymer excluding an acrylic acid homopolymer,
• the anionic group-containing polymer further containing, in addition to the anionic group, at least one group selected from the group consisting of sulfonic acid (salt) groups, cationic groups, (poly)alkylene glycol groups, hydrophobic groups, and lactam groups,
• the cationic groups being derived from a monomer unit derived from a compound represented by the formula (3):
• wherein R2 represents a hydrogen atom or a CH3 group;
• Rb represents a CH2 group, a CH2CH2 group, or a direct bond;
• Rc represents —O—CH2—CH(OH)—CH2—, —O—CH2—CH(CH2OH)—, —O-(A′O1)m—CH2—CH(OH)—CH2-, or —O-(A′O1)m—CH2—CH(CH2OH)— where A′Os are the same as or different from each other and each represent a C2-C18 oxyalkylene group and m is an average number of moles of an oxyalkylene group added represented by A1O and is 1 to 300;
• and R3, R4, and R5 are the same as or different from each other and each represent a hydrogen atom or a C1-C30 organic group where one of R3, R4, and R5 may be absent,
• the hydrophobic groups being derived from a monomer unit derived from a compound represented by the formula (5):
• wherein R9 represents a hydrogen atom or a CH3 group;
• Rd, Re, and Rf are the same as or different from each other and each represent a CH2 group, a CH2CH2 group, or a direct bond;
• x1 represents the number of units represented by (O—CH2—CH(OH)) and is 0 or 1;
• x2 represents the number of units represented by (O—CH2—CH2) and is 0 to 100;
• x3 represents the number of units represented by (O—CH2—CH(OH)) and is 0 or 1, where x2 is 1 to 100 and x3 is 1 when Rd, Re, and Rf each represent a direct bond and x1 is 0;
• and R10 represents a hydrophobic group, and
• the sulfonic acid (salt) groups being derived from a monomer unit derived from a compound represented by formula (2):
• wherein in the formula (2), R1 represents a hydrogen atom or a CH3 group, Ra represents a CH2 group, a CH2CH2 group, or a direct bond, and X and Y are the same as one another or different from one another and each represents a hydroxy group or a sulfonic acid (salt) group, wherein at least one of X and Y represent a sulfonic acid (salt) group.

A method for producing a water-soluble film that includes a polymer containing an anionic group other than a sulfonic acid (salt) group and a water-soluble resin, the anionic group-containing polymer excluding an acrylic acid homopolymer,

• the method comprising the steps of:
• polymerizing a monomer component including an anionic group-containing monomer;
• and
• mixing an anionic group-containing polymer obtained in the polymerization step with a water-soluble resin,
• the anionic group-containing polymer further containing, in addition to the anionic group, at least one group selected from the group consisting of sulfonic acid (salt) groups, cationic groups, (poly)alkylene glycol groups, hydrophobic groups, and lactam groups,
• the cationic groups being derived from a monomer unit derived from a compound represented by the formula (3):
• wherein R2 represents a hydrogen atom or a CH3 group;
• Rb represents a CH2 group, a CH2CH2 group, or a direct bond;
• RC represents —O—CH2—CH(OH)—CH2—, —O—CH2—CH(CH2OH)—, —O—(A1O)m—CH2—CH(OH)—CH2—, or —O—(A1O)m—CH2—CH(CH2OH)— where A1Os are the same as or different from each other and each represent a C2-C18 oxyalkylene group and m is an average number of moles of an oxyalkylene group added represented by A1O and is 1 to 300;
• and R3, R4, and R5 are the same as or different from each other and each represent a hydrogen atom or a C1-C30 organic group where one of R3, R4, and R5 may be absent, the hydrophobic groups being derived from a monomer unit derived from a compound represented by the formula (5):
• wherein R9 represents a hydrogen atom or a CH3 group;
• Rd, Re, and Rf are the same as or different from each other and each represent a CH2 group, a CH2CH2 group, or a direct bond;
• x1 represents the number of units represented by (O—CH2—CH(OH)) and is 0 or 1;
• x2 represents the number of units represented by (O—CH2—CH2) and is 0 to 100;
• x3 represents the number of units represented by (O-CH2-CH(OH)) and is 0 or 1, where x2 is 1 to 100 and x3 is 1 when Rd, Re, and Rf each represent a direct bond and x1 is 0;
• and R10 represents a hydrophobic group, and
• the sulfonic acid (salt) groups being derived from a monomer unit derived from a compound represented by formula (2):
• wherein in the formula (2), R1 represents a hydrogen atom or a CH3 group, Ra represents a CH2 group, a CH2CH2 group, or a direct bond, and X and Y are the same as one another or different from one another and each represents a hydroxy group or a sulfonic acid (salt) group, wherein at least one of X and Y represent a sulfonic acid (salt) group.

A method of packaging at least one selected from the group consisting of a chemical and a detergent, comprising packaging at least one selected from the group consisting of the chemical and the detergent in a package comprising a composition that comprises a polymer containing an anionic group other than a sulfonic acid (salt) group and a water-soluble resin as a material of a water-soluble film,

• the anionic group-containing polymer excluding an acrylic acid homopolymer,
• the anionic group-containing polymer further containing, in addition to the anionic group, at least one group selected from the group consisting of sulfonic acid (salt) groups, cationic groups, (poly)alkylene glycol groups, hydrophobic groups, and lactam groups,
• the cationic groups being derived from a monomer unit derived from a compound represented by the formula (3):
• wherein R2 represents a hydrogen atom or a CH3 group;
• Rb represents a CH2 group, a CH2CH2 group, or a direct bond;
• RC represents —O—CH2—CH(OH)—CH2—, —O—CH2—CH(CH2OH)—, —O—(A1O)m—CH2—CH(OH)—CH2—, or —O—(A1O)m—CH2—CH(CH2OH)— where A1Os are the same as or different from each other and each represent a C2-C18 oxyalkylene group and m is an average number of moles of an oxyalkylene group added represented by A1O and is 1 to 300;
• and R3, R4, and R5 are the same as or different from each other and each represent a hydrogen atom or a C1-C30 organic group where one of R3, R4, and R5 may be absent,
• the hydrophobic groups being derived from a monomer unit derived from a compound represented by the formula (5):
• wherein R9 represents a hydrogen atom or a CH3 group;
• Rd, Re, and Rf are the same as or different from each other and each represent a CH2 group, a CH2CH2 group, or a direct bond;
• x1 represents the number of units represented by (O—CH2—CH(OH)) and is 0 or 1;
• x2 represents the number of units represented by (O—CH2—CH2) and is 0 to 100;
• x3 represents the number of units represented by (O—CH2—CH(OH)) and is 0 or 1, where x2 is 1 to 100 and x3 is 1 when Rd, Re, and Rf each represent a direct bond and x1 is 0;
• and R10 represents a hydrophobic group, and the sulfonic acid (salt) groups being derived from a monomer unit derived from a compound represented by formula (2):
• wherein in the formula (2), R1 represents a hydrogen atom or a CH3 group, Ra represents a CH2 group, a CH2CH2 group, or a direct bond, and X and Y are the same as one another or different from one another and each represents a hydroxy group or a sulfonic acid (salt) group, wherein at least one of X and Y represent a sulfonic acid (salt) group.