Anti-fouling coating compositions containing a carboxyl-functional organosilicone
AssigneeAkzo Nobel Coatings International B.V.
InventorsCait Marie Davies, David Neil Williams, Kathryn Joyce Willett
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Abstract
An anti-fouling coating composition comprising (i) a curable polymer and (ii) an organosilicone polymer. This anti-fouling coating composition has a low surface energy, has suitable elastomeric properties, decreases the settlement of fouling organisms and their adhesion strength, and can be used as a clear coat without a misty or milky appearance.
Claims11
An anti-fouling coating composition comprising a solution of a solvent, a curable polymer and a fluid organosilicone polymer represented by the general formula:
- wherein:
- R1 may be the same or different and is selected from alkyl, aryl, and alkenyl groups, an oxygen-containing group of the formula OR5, wherein R5 is hydrogen or a C1-6 alkyl, and a functional group according to the formula (I):
- —R6—N(R7)—C(O)—R8—C(O)—XR9 (I)
- wherein
- R6 is selected from alkyl, hydroxyalkyl, carboxyalkyl of 1 to 12 carbon atoms, and polyoxyalkylene of up to 10 carbon atoms;
- R7 is selected from hydrogen, alkyl, hydroxyalkyl, carboxyalkyl of 1 to 6 carbon atoms, and polyoxyalkylene of 1 to 10 carbon atoms;
- R7 may be bonded to R8 to form a ring;
- R8 is an alkylene group with 1-20 carbon atoms;
- R9 is hydrogen or an alkyl group with 1-10 carbon atoms, optionally substituted with oxygen- or nitrogen-containing groups;
- X is selected from O, S, and NH;
- wherein at least one R1-group in the organosilicone polymer is a functional group according to the above formula (I) or a salt derivative thereof;
- R2 may be the same or different and is selected from alkyl, aryl, and alkenyl;
- R3 and R4, which may be the same or different, are selected from alkyl, aryl, capped or uncapped polyoxyalkylene, alkaryl, aralkylene, and alkenyl;
- a is an integer from 0 to 50,000;
- and
- b is an integer from 0 to 100;
- and
- a+b is at least 25,
- wherein the solid content of the coating composition is at least 50 wt %.
A method for inhibiting fouling of a substrate in an aquatic environment, the method comprising the step of applying a coating composition comprising a solution of a solvent, a curable polymer and a fluid organosilicone polymer represented by the general formula:
- wherein:
- R1 may be the same or different and is selected from alkyl, aryl, and alkenyl groups, an oxygen-containing group of the formula OR5, wherein R5 is hydrogen or a C1-6 alkyl, and a functional group according to the formula (I):
- —R6—N(R7)—C(O)—R8—C(O)—XR9 (I)
- wherein
- R6 is selected from alkyl, hydroxyalkyl, carboxyalkyl of 1 to 12 carbon atoms, and polyoxyalkylene of up to 10 carbon atoms;
- R7 is selected from hydrogen, alkyl, hydroxyalkyl, carboxyalkyl of 1 to 6 carbon atoms, and polyoxyalkylene of 1 to 10 carbon atoms;
- R7 may be bonded to R8 to form a ring;
- R8 is an alkylene group with 1-20 carbon atoms;
- R9 is hydrogen or an alkyl group with 1-10 carbon atoms, optionally substituted with oxygen- or nitrogen-containing groups;
- X is selected from O, S, and NH;
- wherein at least one R1-group in the organosilicone polymer is a functional group according to the above formula (I) or a salt derivative thereof;
- R2 may be the same or different and is selected from alkyl, aryl, and alkenyl;
- R3 and R4, which may be the same or different, are selected from alkyl, aryl, capped or uncapped polyoxyalkylene, alkaryl, aralkylene, and alkenyl;
- a is an integer from 0 to 50,000;
- and
- b is an integer from 0 to 100;
- and
- a+b is at least 25, and
- wherein the solid content of the coating composition is at least 50 wt %,
- to the substrate, and immersing the coated substrate in the aquatic environment.
Dependencies are inferred from the claim text.