Low Humidity Cure for Moisture Curable Coatings
OwnerStephen John Crowleyinventor
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Abstract
The invention is directed to a low humidity cure moisture curable coating composition which includes a moisture cure binder component that includes: a moisture curable binder material and at least one organic solvent; and a humectant component that includes a slow evaporating volatile humectant; wherein the humectant is present in an amount sufficient to increase the cure rate of the coating and to provide a cured coating having acceptable mechanical and cosmetic properties at a relative humidity of 50% or lower; and the invention is also directed to a method for curing moisture curable coating compositions under low humidity conditions.
Claims14
A low humidity cure moisture curable coating composition comprising:
- a) a moisture cure binder component which comprises:
- i) a moisture curable binder material, and
- ii) at least one an organic solvent;
- and
- b) a humectant component which comprises a slow evaporating volatile humectant;
- wherein the humectant is present in an amount sufficient to increase the cure rate of the coating at a relative humidity of 50% or lower and to provide a cured coating having acceptable mechanical and cosmetic properties when cured at a relative humidity of 50% or lower.
A method for curing a moisture curable coating composition under low humidity conditions, said method comprising:
- a) providing a high humidity moisture curable coating composition that is capable of curing under sufficiently high relative humidity, but which fails to form a cured coating having acceptable mechanical and cosmetic properties at a relative humidity of 50 wt % or lower;
- b) adding a slow evaporating volatile humectant to the high humidity moisture curable coating, in an amount sufficient to increase the cure rate of the coating at a relative humidity of 50% or lower and sufficient to provide a cured coating having acceptable mechanical and cosmetic properties when cured under such conditions;
- c) mixing the resulting composition containing the humectant, to provide a low humidity cure coating composition;
- d) coating the low humidity cure coating composition on a substrate;
- and
- e) curing the coating on the substrate under conditions where the relative humidity is 50% or lower.
Dependencies are inferred from the claim text.