Breathable coating compositions
AssigneeBrookwood Companies Incorporated
InventorThomas Colasanto
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Abstract
Coating compositions and the use thereof are provided for the coating of substrates which provide increased and durable breathability and/or waterproofness to substrates coated with cured films produced therefrom. These increased benefits are achieved through the formation of cured coating films comprising polyurethane domains with specific polymers interspersed between the domains. The polyurethane and secondary polymer are able to interact to form these unique films through the selection of specific polymers with complimentary solvent characteristics coupled with specific attractions between the polyurethanes and polymers. Preferred polymers include polyethylenimine and anionic polyurethanes (e.g., polycarbonate polyurethanes, polycarbonate polyether polyurethanes, etc.).
Claims20
A coating composition for forming a polymeric coating on a substrate comprising:
- (a) a dispersion of polyurethane particles in liquid media, wherein said polyurethane particles are present in said dispersion in an amount sufficient to coalesce to form a continuous and non-porous film upon removal of said media, and
- (b) a secondary polymer;
- dispersed in the liquid media;
- wherein said secondary polymer is polyethyleneimine and has a molecular weight of greater than 100,000 g/mol;
- wherein the substrate is a woven or knitted fabric and
- said substrate with said polymeric coating has a moisture vapor transmission rate within 0% and 30% of an otherwise identical uncoated substrate at 90° F. and 90% humidity.
A coating composition for forming a polymeric non-porous coating on a substrate comprising polycarbonate polyurethane and polyethyleneimine;
- wherein the substrate is a woven or knitted fabric.
Dependencies are inferred from the claim text.