Abstract A laminate of at least two layers including at least one flexible coating layer composed of a polyurethane composition for sealing separations in substrate layers, such as structural members, and the method of forming these laminates. The flexible coating layer covers adjacent surfaces of the substrate layer and the separation and is adhered to the substrate layer except in areas immediately adjacent to and directly over each separation, thus forming at least one nonadhering portion of the coating layer so that when the substrate layer moves due to thermal or mechanical forces substantially all of any stress associated with such movement is distributed over each nonadhering portion to prevent a concentration of stresses which would rupture the coating layer. The laminates of this invention are particularly useful for sealing separation in the bulkhead compartment of ships, and the flexible coatings of such laminates are composed of polyurethane compositions having resistance to fuels and water hydrolysis.
The laminate as claimed in claim 1, wherein the polyurethane composition is characteriZed by being resistant to water hydrolysis when immersed in distilled water for 14 days at 158* F.
Claim 2
Dependent Claim
84 words
The laminate as claimed in claim 1, wherein the polyurethane composition is a polyesterurethane having about 3,000 pounds tensile strength, or higher, after exposure in water for 14 days at 158* F., comprising the reaction product of a mol of a polyester selected from the group consisting of polyhexamethylene adipate, polyhexamethylene azelate, polytetramethylene azelate and polytetramethylene adipate having a molecular weight of 800 to 2,200, from about 1.6 to 3.5 mols of 4,4''-dicyclohexyl methane diisocyanate and 0.75 to 1.0 mols of an aromatic diamine.
Claim 3
Dependent Claim
63 words
The laminate as claimed in claim 1, wherein at least one additional flexible coating layer composed of a polyurethane composition is superposed over said substrate layer in the areas thereof immediately adjacent to each separation therein which is not adhered to said coating layer and at least one said filler is superposed over at least a portion of each said additional coating layer.
Claim 4
Dependent Claim
46 words
The laminate as claimed in claim 1, wherein said substrate layer includes two members which are inclined in relation to each other with a separation formed at the juncture thereof which is covered by fillers of flexible material positioned adjacent the separation on either side thereof.
Claim 5
Dependent Claim
46 words
The laminate as claimed in claim 1, wherein each said filler is an elongated strip of material having a tensile strength lower than that of said coating layer thereof and selected from the group consisting of natural and synthetic foam rubbers, caulking compounds and textile fabrics.