Coating agent, and coating layer and film using same
AssigneeAGC Inc.
InventorsMakito Nakamura, Kaoru Oguro, Tomeyoshi Ohori
Life of this patent
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Abstract
To provide a coating agent capable of forming a coating layer or film excellent in moisture permeability, flexibility and tensile strength. A coating agent comprising an isocyanate group-containing prepolymer obtainable by reacting a polyol mixture (A) and a polyisocyanate compound (B), wherein the polyol mixture (A) is a mixture of at least two polyoxyalkylene polyols which are different in the number of hydroxy groups or the hydroxy value, and said mixture has an average number of hydroxy groups being from 2.2 to 2.6, a molecular weight per hydroxy group being from 1,500 to 10,000 and an oxyethylene group content being at least 60 mass %.
Claims14
A coating agent comprising an isocyanate group-containing prepolymer obtained by reacting a polyol mixture (A) and a polyisocyanate compound (B),
- wherein
- the polyisocyanate compound (B) is an aromatic diisocyanate, and
- the polyol mixture (A) comprises:
- a polyoxyalkylene polyol (a) which has a number of hydroxy groups being at least 3, and an oxyethylene group content being at least 60 mass %;
- and
- a polyoxyalkylene diol (b) which has a number of hydroxy groups being 2, and an oxyethylene group content being at least 60 mass %,
- wherein the polyol mixture (A) has an average number of hydroxy groups being from 2.2 to 2.6, and an oxyethylene group content being at least 60 mass %,
- wherein a value obtained by dividing a molecular weight of the polyoxyalkylene polyol (a) calculated from a hydroxyl value (mgKOH/g) of the polyoxyalkylene polyol (a) by the number of hydroxyl groups in the polyoxyalkylene polyol (a) is from 1,500 to 10,000,
- wherein a value obtained by dividing a molecular weight of the polyoxyalkylene diol (b) calculated from a hydroxyl value (mgKOH/g) of the polyoxyalkylene diol (b) by the number of hydroxyl groups in the polyoxyalkylene diol (b) is from 1,500 to 10,000, and
- wherein a value obtained by dividing a molecular weight of the polyol mixture (A) calculated from a hydroxyl value (mgKOH/g) of the polyol mixture (A) by the average number of hydroxyl groups in the polyol mixture (A) is from 1,500 to 10,000.
Dependencies are inferred from the claim text.