Cationic electrodeposition coating composition
AssigneeKansai Print Co., Ltd
InventorsShigeo Nishiguchi, Akihiko Shimasaki
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Abstract
An object of the present invention is to provide a coating composition that has excellent electrodeposition coating applicability onto hot dip galvanized steel sheets, and that provides a cationic electrodeposition coating film having a superior finish and excellent anti-corrosion properties. The present invention provides a cationic electrodeposition coating composition having: amino group-containing modified epoxy resin (A), phenolic hydroxy group-containing resin (B), and blocked polyisocyanate curing agent (C), the components (A), (B), and (C) being contained in amounts of 5 to 50 mass %, 20 to 75 mass %, and 10 to 40 mass %, respectively, based on the total solids mass of the components (A), (B), and (C).
Claims5
A cationic electrodeposition coating composition comprising:
- amino group-containing modified epoxy resin (A),
- phenolic hydroxy group-containing resin (B), and
- blocked polyisocyanate curing agent (C),
- said component (A) being contained in an amount of 20 to 75 mass %, said component (B) being contained in an amount of 5 to 50 mass %, and said component (C) being contained in an amount of 10 to 40 mass %, based on the total solids mass of said components (A), (B), and (C),
- said phenolic hydroxy group-containing resin (B) being obtainable by reacting diepoxy compound (b11) and/or epoxy resin (b12) having an epoxy equivalent of 170 to 500 with bisphenol compound (b13) at an equivalent ratio of [epoxy groups in said diepoxy compound (b11) and epoxy resin (b12)]/[phenol groups in said bisphenol compound (b13)]=0.5 to 0.85,
- said diepoxy compound (b11) being compound (1) represented by Formula (1),
- wherein R1 is the same or different, and each represents a hydrogen atom or C1-6 alkyl group;
- and
- m and n, which represent the number of repeating units of a portion having an alkylene oxide structure, are integers where m+n=1 to 20, and/or
- compound (2) represented by Formula (2),
- wherein R2 is the same or different, and each represents a hydrogen atom or C1-6 alkyl group;
- X represents an integer of 1 to 9;
- and Y represents an integer of 1 to 50.
Dependencies are inferred from the claim text.