Patent ID: 11905432
Assignee: NIPPON PAINT MARINE COATINGS CO., LTD.
Field: Basic materials chemistry (Chemistry)
Classification: CPC C | IPC C

Claim 0:
1. An antifouling coating composition comprising a silicon atom-containing resin,
wherein
the silicon atom-containing resin includes:
a constituent unit (A) derived from a monomer (a) having at least one kind of silicon atom-containing group selected from the group consisting of a group represented by a formula (I) below, a group represented by a formula (II) below, a group represented by a formula (III) below, and a group represented by a formula (IV) below;
a constituent unit (B) derived from a monomer (b) which is a (meth)acrylic acid ester represented by a formula (b) below; and

a constituent unit (C) derived from a monomer (c) other than the monomer (a) and the monomer (b),
the monomer (a) has a number average molecular weight of greater than 2500,
a content of the constituent unit (A) is greater than 20% by mass in all constituent units contained in the silicon atom-containing resin,
the monomer (c) is a monomer having a homopolymer solubility parameter SP of greater than or equal to 9.0 (cal/cm3)1/2 and less than or equal to 9.5 (cal/cm3)1/2 and having no cyclic structure, and
a content of the constituent unit (C) is greater than 2% by mass in all constituent units contained in the silicon atom-containing resin:, , [in the formula (I), a and b each independently represent an integer of 2 to 5, m represents an integer of 0 to 50, and n represents an integer of 3 to 270; and R1 to R5 each independently represent an alkyl group, an alkoxy group, a phenyl group, a substituted phenyl group, a phenoxy group, or a substituted phenoxy group];, , [in the formula (II), c and d each independently represent an integer of 2 to 5, and p represents an integer of 0 to 50; R6, R7, and R8 each independently represent an alkyl group, Ra, or Rb;
Ra is, , (in the formula, x represents an integer of 0 to 200, and R23 to R27 are the same or different and each represent an alkyl group);
Rb is, , (in the formula, y represents an integer of 1 to 200, and R28 and R29 are the same or different and each represent an alkyl group)];, , [in the formula (III), e, f, g, and h each independently represent an integer of 2 to 5, q and s each independently represent an integer of 0 to 50, and r represents an integer of 3 to 270; R9 to R12 each independently represent an alkyl group, an alkoxy group, a phenyl group, a substituted phenyl group, a phenoxy group, or a substituted phenoxy group];, , [in the formula (IV), i, j, k, and l each independently represent an integer of 2 to 5, t and u each independently represent an integer of 0 to 50, and v and w each independently represent an integer of 0 to 70; and R13 to R22 are the same or different and each represent an alkyl group]; and

CH2═C(RA)(COORB)  (b), [in the formula (b), RA represents a hydrogen atom or a methyl group; and RB represents a monovalent group including one or more kinds selected from the group consisting of a carboxy group, and an oxyalkylene chain], and
wherein
the antifouling coating composition further comprises at least one kind of solvent selected from the group consisting of hydrocarbons, ethers, esters, ketones and alcohols,
the silicon atom-containing resin is dissolved in the solvent, and
wherein the homopolymer solubility parameter SP is measured by the following method:
at a measurement temperature of 20° C., 0.5 g of a homopolymer is weighed in a 100 mL beaker, and 10 mL of acetone is added using a whole pipette and dissolved with a magnetic stirrer to prepare a diluted solution;
n-hexane is gradually added dropwise to the diluted solution using a 50 mL burette, and the point at which turbidity occurs in the diluted solution is defined as a dropping amount of the n-hexane;
ion-exchanged water is gradually added dropwise to a second portion of the diluted solution, and the point at which turbidity occurs in the diluted solution is defined as a dropping amount of the ion-exchanged water; and
calculate the homopolymer solubility parameter SP from the dropping amount of each of the n-hexane and ion-exchanged water until the turbidity point is reached.