Aqueous dispersion, production method therefor, coating composition, and coating film
An aqueous dispersion including a polymer having a 2-oxazoline group; and a surfactant, the surfactant containing a sulfuric acid ester compound represented by the following Chemical Formula (S): R 1 —O—(R 2 O)nSO 3 X (S) wherein R 1 represents an aliphatic hydrocarbon group having 8 to 20 carbon atoms; R 2 represents an alkylene group having 2 to 4 carbon atoms; n represents 2 to 15; and X represents a monovalent cation.
1 . An aqueous dispersion comprising:
a polymer (A) having a 2-oxazoline ring group; and
a surfactant,
wherein the surfactant contains a sulfuric acid ester compound represented by the following Chemical Formula(S):
R 1 —O—(R 2 O) n SO 3 X (S)
wherein R 1 represents an aliphatic hydrocarbon group having 8 to 20 carbon atoms; R 2 represents an alkylene group having 2 to 4 carbon atoms; n represents 2 to 15; and X represents a monovalent cation,
wherein the aqueous dispersion comprises 0.7% by mass or more of the sulfuric acid ester compound with respect to the total amount of the polymer (A), and
wherein the polymer (A) includes 5% to 50% by mass of a structural unit having the 2-oxazoline ring group with respect to the total mass of the polymer (A).
2 . The aqueous dispersion according to claim 1 , wherein the proportion of the sulfuric acid ester compound with respect to the total amount of the surfactant included in the aqueous dispersion is 50% to 100% by mass.
3 . The aqueous dispersion according to claim 1 , further comprising an isothiazoline-based compound.
4 . The aqueous dispersion according to claim 3 , wherein the aqueous dispersion comprises 10 to 5,000 ppm by mass of the isothiazoline-based compound with respect to the total amount of the polymer (A).
5 . The aqueous dispersion according to claim 3 , wherein the isothiazoline-based compound includes benzisothiazoline.
6 . The aqueous dispersion according to claim 1 , wherein the polymer (A) includes 5% to 40% by mass of the structural unit having the 2-oxazoline group with respect to the total mass of the polymer (A).
7 . A method for producing an aqueous dispersion including a polymer (A) having a 2-oxazoline ring group; and a surfactant,
wherein the surfactant contains a sulfuric acid ester compound represented by the following Chemical Formula(S):
R 1 —O—(R 2 O) n SO 3 X (S)
wherein R 1 represents an aliphatic hydrocarbon group having 8 to 20 carbon atoms; R 2 represents an alkylene group having 2 to 4 carbon atoms; n represents 2 to 15; and X represents a monovalent cation,
wherein the method comprises a step of producing the polymer (A) by subjecting a monomer mixture containing an addition-polymerizable oxazoline monomer to emulsion polymerization in the presence of the surfactant containing the sulfuric acid ester compound, and
forming the aqueous dispersion including the polymer (A) having the 2-oxazoline ring group,
wherein the aqueous dispersion comprises 0.7% by mass or more of the sulfuric acid ester compound with respect to the total amount of the polymer (A), and
wherein the polymer (A) includes 5% to 50% by mass of a structural unit having the 2-oxazoline ring group with respect to the total mass of the polymer (A).
8 . A coating film comprising:
a polymer (A) having a 2-oxazoline ring group;
a sulfuric acid ester compound represented by Chemical Formula(S):
R 1 —O—(R 2 O) n SO 3 X (S)
wherein R 1 represents an aliphatic hydrocarbon group having 8 to 20 carbon atoms; R 2 represents an alkylene group having 2 to 4 carbon atoms; n represents 2 to 15; and X represents a monovalent cation; and
a polymer (B) having a carboxyl group;
wherein the coating film comprises 0.7% by mass or more of the sulfuric acid ester compound with respect to the total amount of the polymer (A), and
wherein the polymer (A) includes 5% to 50% by mass of a structural unit having the 2-oxazoline ring group with respect to the total mass of the polymer (A).
9 . A coating composition comprising the aqueous dispersion according to claim 1 and a polymer (B) having a carboxyl group.
10 . The aqueous dispersion according to claim 1 comprising emulsion particles.
11 . The aqueous dispersion according to claim 1 , wherein a weight average molecular weight of the polymer (A) is no less than 100,000.
12 . The method according to claim 7 , wherein the aqueous dispersion comprising emulsion particles.
13 . The method according to claim 7 , wherein a weight average molecular weight of the polymer (A) is no less than 100,000.
14 . The coating film according to claim 8 , wherein a weight average molecular weight of the polymer (A) is no less than 100,000.