Protection of substrates against aquatic fouling
AssigneeCourtaulds Coatings Limited
InventorsWilliam W. Slater, John Kelly, Michael J. Winter
Life of this patent
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Abstract
A process for protecting a rigid substrate against aquatic fouling comprises coating the substrate with an elastomeric undercoat as a 200 to 1500 micron thick layer and with a top coat of a room temperature vulcanisable silicone rubber. The elastomeric undercoat is generally harder than the room temperature vulcanisable silicone rubber foul resistant top coat and preferably has a Shore A hardness of 60 to 90 and an extensibility of 200 to 800%. The abrasion and tear resistance of the silicone rubber foul resistant layer is markedly increased by the use of the elastomeric undercoat.
Claims19
A process for protecting a rigid substrate against aquatic fouling comprising coating the substrate with an elastomeric undercoat as a 200 to 1500 micron thick layer and with a top coat of a room temperature vulcanizable silicone rubber, the elastomer of said undercoat being a polymer having the ability to be stretched to at least twice its original length and to retract rapidly, with retraction of at least 90% of extension, when released, said undercoat being harder than the room temperature vulcanizable silicone rubber top coat.
A process for protecting a rigid substrate against aquatic fouling comprising coating the substrate with an elastomeric undercoat layer at least 300 microns thick of a coating having a Shore A hardness of 60 to 90 and an extensibility of 200 to 800%, and with a top coat of a room temperature vulcanizable silicone rubber having a Shore A hardness of less than that of the elastomeric undercoat.
A rigid substrate having a surface which is intended to be in contact with water in use, wherein said surface is coated with a 200 to 1500 micron thick undercoat layer of an elastomer, said elastomer being a polymer having the ability to be stretched to at least twice its original length and to retract rapidly, with retraction being at least 90% of extension, when released, and a anti-fouling top coat of a room temperature vulcanizable silicone rubber, the elastomeric undercoat being harder than the room temperature vulcanizable silicone rubber top coat.
Dependencies are inferred from the claim text.