Condensation curable silicone foul release coatings and articles coated therewith
AssigneeGeneral Electric Company
InventorsJudith Stein, Timothy Brydon Burnell, James Anthony Cella
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Abstract
Anti-fouling coatings comprise a room temperature vulcanizable polyorganosiloxane composition and a polyorganosiloxane free from silanol groups and comprising at least one hydroxy- or alkoxy-terminated polyoxyalkylenealkyl radical. The latter is capable of blooming to the surface of the cured room temperature vulcanizable composition, thus inhibiting the deposition of marine life on the coated article.
Claims6
An article comprising a marine structure coated with an anti-fouling coating which is the condensation cured reaction product of a condensation curable coating composition comprising the following and any reaction products thereof:
- (A) a one- or two-part room temperature vulcanizable polyorganosiloxane composition, and
- (B) a marine foul release-enhancing proportion of at least one polyorganosiloxane free from silanol groups and comprising about 10-60% by weight of at least one hydroxy- or alkoxy-terminated polyoxyalkylenealkyl radical,
- component B being capable of blooming to the surface of the cured product of component A.
An article comprising a marine structure coated with an anti-fouling coating which is the condensation cured reaction product of a condensation curable coating composition comprising components (A) and (B) and any reaction products thereof:
- wherein the first component (A) comprises a one- or two-part room-temperature vulcanizable polyorganosiloxane composition which comprises at least one crosslinking agent wherein the agent comprises tetraalkyl silicate;
- at leat one condensation catalyst wherein the catalyst comprises a tin, zirconium or titanium compound;
- and at least one reactive silicone wherein the reactive silicone is a polydialkylsiloxane having the formula
- wherein each R2 is methyl, and each R1 is hydroxyl or
- wherein R3 and R4 is a hydrocarbon radical and a is O or 1, and
- wherein the second component (B) comprises a marine foul release-enhancing proportion which comprises compounds of the formula
- wherein each R5 has the formula
- —R7—(OR8)z—OR9 , (IV)
- wherein each R6 therein is methyl, R7 is trimethylene, R8 is ethylene and R9 is hydrogen;
- n has a value such that the weight average molecular weight of the compound of formula III is in the range of about 500-40,000;
- and z and the number of radicals of formula IV are such that said radicals of formula IV comprise about 10% and about 60% by weight of component B.
- component B being capable of blooming to the surface of the cured product of component A.
Dependencies are inferred from the claim text.