Polymer-containing composition and antifouling coating composition
Provided is an antifouling coating composition, which can form a coating film having good hardness and good physical properties and having a wear degree appropriate for expressing a long-term antifouling effect, has a viscosity not being excessively high, and makes it possible to reduce a content of volatile organic compounds, and a polymer-containing composition which is suitable for obtaining the antifouling coating composition. The polymer-containing composition contains a (meth)acryl-based copolymer (A-1), in which the (meth)acryl-based copolymer (A-1) contains a constitutional unit (U11) or a constitutional unit (U12) having carboxylate forming an ionic bond with a divalent metal atom, and has a weight-average molecular weight of 1,000 to 5,000, and the polymer-containing composition has a coating film hardness (Martens hardness) equal to or higher than 2.5 N/mm 2 .
1. A polymer-containing composition comprising:
a (meth)acryl-based copolymer (A-1) having an acid value equal to or higher than 35 mgKOH/g,
wherein the (meth)acryl-based copolymer (A-1) contains a constitutional unit (U11) represented by Formula (11), a constitutional unit (U12) represented by Formula (12), or both,
and has a weight-average molecular weight of 1,000 to 5,000, and
a vinyl-based polymer (B),
wherein the vinyl-based polymer (B) has an acid value less than 25 mgKOH/g and has a number-average molecular weight of 2,000 to 20,000, and
wherein a coating film hardness of the polymer-containing composition is equal to or higher than 2.5 N/mm 2 ,
—(C═O)—O—M—O—(C═O)— (11)
—(C═O)—O—M—R 32 (12)
wherein R 32 represents an organic acid residue, and M represents a divalent metal atom.
2. The polymer-containing composition according to claim 1 ,
wherein a Tg of the vinyl-based polymer (B) is equal to or higher than 20° C.
3. The polymer-containing composition according to claim 1 ,
wherein a ratio of the (meth)acryl-based copolymer (A-1):the vinyl-based polymer (B) contained in the polymer-containing composition is 98:2 to 70:30.
4. The polymer-containing composition according to claim 1 ,
wherein a solubility parameter of the polymer-containing composition is less than 11.1 (cal/cm 3 ) 1/2 .
5. The polymer-containing composition according to claim 1 ,
wherein the (meth)acryl-based copolymer (A-1) contains a constitutional unit (U3) in addition to the constitutional unit (U11), the constitutional unit (U12), or both, and
the constitutional unit (U3) contains a constitutional unit derived from a monomer (u3-1) having an alicyclic functional group.
6. The polymer-containing composition according to claim 5 ,
wherein a constitutional unit whose proportion in the constitutional unit (U3) is equal to or higher than 30% by mass is derived from a monomer whose corresponding homopolymer has a Tg equal to or higher than 50° C.
7. The polymer-containing composition according to claim 1 ,
wherein a Gardner viscosity of the polymer-containing composition is equal to or lower than Z at a solid content of 55% by mass.
8. An antifouling coating composition comprising:
the polymer-containing composition according to claim 1 .
9. The antifouling coating composition according to claim 8 , further comprising:
an antifouling agent.
10. The antifouling coating composition according to claim 9 ,
wherein the antifouling agent is one or more compounds selected from the group consisting of cuprous oxide, 4-bromo-2-(4-chlorophenyl)-5-(trifluoromethyl)-1H-pyrrole-3-carbonitrile, pyridine-triphenylborane, zinc pyrithione, copper pyrithione, and medetomidine.
11. The antifouling coating composition according to claim 8 , further comprising:
a thermoplastic resin other than the (meth)acryl-based copolymer (A-1), a (meth)acryl-based copolymer (A-2), or the vinyl-based polymer (B),
wherein the (meth)acryl-based copolymer (A-2) contains the constitutional unit (U11) represented by Formula (11), the constitutional unit (U12) represented by Formula (12), or both, and has a weight-average molecular weight of 1,000 to 5,000,
the (meth)acryl-based copolymer (A-2) contains a constitutional unit (U3) in addition to the constitutional unit (U11), the constitutional unit (U12), or both,
the constitutional unit (U3) contains a constitutional unit derived from a monomer (u3-1) having an alicyclic functional group, and
a constitutional unit whose proportion in the constitutional unit (U3) is equal to or higher than 30% by mass is derived from a monomer whose corresponding homopolymer has a Tg equal to or higher than 50° C.
12. The antifouling coating composition according to claim 8 ,
wherein a coating material solid content of the antifouling coating composition is equal to or greater than 60% by mass.
13. A polymer-containing composition comprising:
a (meth)acryl-based copolymer (A-1),
wherein the (meth)acryl-based copolymer (A-1) contains a constitutional unit (U11) represented by Formula (11), a constitutional unit (U12) represented by Formula (12), or both, and has a weight-average molecular weight of 1,000 to 5,000,
a solubility parameter of the polymer-containing composition is less than 11.1 (cal/cm 3 ) 1/2 , and
a coating film hardness of the polymer-containing composition is equal to or higher than 2.5 N/mm 2 ,
—(C═O)—O—M—O—(C═O)— (11)
—(C═O)—O—M—R 32 (12)
wherein R 32 represents an organic acid residue, and M represents a divalent metal atom.
14. The polymer-containing composition according to claim 13 ,
wherein the (meth)acryl-based copolymer (A-1) contains a constitutional unit (U3) in addition to the constitutional unit (U11), the constitutional unit (U12), or both, and
the constitutional unit (U3) contains a constitutional unit derived from a monomer (u3-1) having an alicyclic functional group.
15. The polymer-containing composition according to claim 14 ,
wherein a constitutional unit whose proportion in the constitutional unit (U3) is equal to or higher than 30% by mass is derived from a monomer whose corresponding homopolymer has a Tg equal to or higher than 50° C.
16. An antifouling coating composition comprising:
the polymer-containing composition according to claim 13 .
17. The antifouling coating composition according to claim 16 , further comprising:
an antifouling agent.