Coating composition
AssigneeAsahi Glass Company, Limited
InventorsMasanori Toyofuku, Satoru Mori, Josho Kashiwame, Kaoru Oguro
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Abstract
1. A coating composition to form a coating layer or film of a hydrophilic polyurethane resin having a moisture permeability and being substantially non-porous, which comprises, as an essential component, an isocyanate group-containing prepolymer obtainable by reacting diphenylmethane diisocyanate with the following polyoxyalkylene polyol: A polyoxyalkylene polyol which contains at least 60 wt % of a polyoxyethylene polyol having at least three hydroxyl groups and having an oxyethylene group-content of at least 10 wt %, satisfies 3.0<n<3.5, where n is the average number of hydroxyl groups, and has an average oxyethylene group-content of from 60 to 90 wt %.
Claims8
A coating composition to form a coating layer or film of a hydrophilic polyurethane resin having a moisture permeability and being non-porous, which comprises an isocyanate group-containing prepolymer obtained by reacting diphenylmethane diisocyanate with the following mixture of polyoxyalkylene polyols:
- a mixture of polyoxyalkylene polyols which contains at least 60 wt %, based on the mixture of polyoxyalkylene polyols, of a polyoxyethylene polyol, said polyoxyethylene polyol having at least three hydroxyl groups and having an oxyethylene group-content of at least 10 wt %, based on the polyoxyethylene polyol;
- wherein said mixture of polyoxyalkylene polyols satisfies 3.0<n<3.5, where n is the average number of hydroxyl groups, and has an average oxyethylene group-content of from 60 to 90 wt %, based on the mixture of polyoxyalkylene polyols,
- wherein the mixture of polyoxyalkylene polyols excludes polyoxyalkylene polyols containing only two hydroxyl groups.
Dependencies are inferred from the claim text.