Claims
- 1. A cationically electrodepositable paint composition containing as main components
- (i) at least one cationic resin selected from the group consisting of primary hydroxyl group-containing cationic resins (X) and (Y), and
- (II) a curing agent (Z),
- said primary hydroxyl group-containing cationic resin (X) being obtained by reacting an epoxy resin (A) having at least three epoxy group-containing functional groups represented by the following structural formula (I) ##STR17## with a primary or secondary amine compound (B) containing primary hydroxyl group, and said primary hydroxyl group-containing cationic resin (Y) being obtained by reacting the epoxy resin (A) with the amine compound (B) and further with a phenol compound (C) having at least one phenolic hydroxyl group in the molecule.
- 2. A paint composition according to claim 1, further comprising, as a curing catalyst, at least one compound selected from lead compounds, zirconium compounds, cobalt compounds, aluminum compounds, manganese compounds, copper compounds, zinc compounds, iron compounds, chromium compounds and nickel compounds, in such a proportion that the metal content becomes 10% by weight or less based on the solid content of the resin.
- 3. An article coated with the cationically electrodepositable paint composition according to claim 1.
- 4. A cationically electrodepositable paint composition according to claim 1 wherein the curing agent (Z) is a blocked polyisocyanate compound or a polyeposide compound selected from the group consisting of epoxy resins having the repeating unit represented by the following formula (VI): ##STR18## wherein n is an integer of 3 to 30, and (b) polymers of a number average molecular weight of 3,000 to 200,000 having the repeating unit represented by the following formula (VII): ##STR19## wherein R.sub.1 is a hydrogen atom or methyl group.
- 5. A paint composition according to claim 1, wherein the epoxy resin (A) is obtained by subjecting 4-vinylcyclohexene-1-oxide to ring-opening homopolymerization or to ring-opening copolymerization with another epoxy group-containing compound using an active hydrogen-containing organic compound as an initiator and then epoxidizing at least part of the vinyl group contained in the side chain of the polymer (co)polymer formed.
- 6. A paint composition according to claim 5, wherein the other epoxy grou-containing compound is an alicyclic oxirane group-containing vinyl monomer represented by the formula ##STR20## wherein R.sub.2 is a hydrogen atom or a methyl group and R.sub.3 is an aliphatic saturated hydrocarbon group of 1-6 carbon atoms.
- 7. A paint composition according to claim 5, wherein the epoxy resin (A) has a number-average molecular weight of about 700 to about 5,000.
- 8. A paint composition according to claim 1, wherein the amine compound (B) is secondary alkanolamine.
- 9. A paint composition according to claim 1, wherein the epoxy resin (A) is reacted with the amine compound (B) in such an amount that the molar ratio of expoxy groups in the epoxy resin (A) to amine active hydrogens in the amine compound (B) is in the range of 1:0.5 to 1:1.5.
- 10. A paint composition according to claim 1, wherein the epoxy resin (A) is used in a quantity of 20 to 90% by weight based on total quantity of the epoxy resin (A) and the amine compound (B).
- 11. A paint composition according to claim 1, wherein the cationic resin (X) has an amine value in the range of 3 to 200 in terms of KOH (mg/g solid).
- 12. A paint composition according to claim 1, wherein the cationic resin (X) contains primary hydroxyl groups in a quantity in the range of 10 to 1,000 in terms of hydroxyl value.
- 13. A paint composition according to claim 1, wherein the phenol compound (C) is bisphenol resin having a structure of bisphenol A or bisphenol F.
- 14. A paint composition according to claim 13, wherein the phenol resin has a number average molecular weight in the range of about 800 to about 3,000 and 0.8 to 1.2 phenolic hydroxyl group per molecule.
- 15. A paint composition according to claim 13, wherein the phenol resin is one represented by the following formula: ##STR21## wherein q is an integer of 0 to 7 on average, R.sub.2 is hydrogen or a methyl group, and R.sub.5 is a residue of an active hydrogen-containing compound.
- 16. A paint composition according to claim 1, wherein the epoxy resin (A) is used in the range of 0.5 to 95% by weight based on the total quantity of (A) to (C) components.
- 17. A paint composition according to claim 1, wherein the phenol compound (C) is used in the range of 20 to 90% by weight based on the total quantity of (A) to (C) components.
- 18. A paint composition according to claim 1, wherein the cationic resin (Y) has an amine value in the range of 3 to 200 in terms of KOH (mg/g solid).
- 19. A paint composition according to claim 1, wherein the cationic resin (Y) contains primary hydroxyl groups in a quantity in the range of 10 to 1,000 in terms of hydroxyl value.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-86933 |
Apr 1989 |
JPX |
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Parent Case Info
This application is a division of U.S. patent application Ser. No. 07/504,905, filed Apr. 5, 1990, now U.S. Pat. No. 5,089,542.
US Referenced Citations (1)
Number |
Name |
Date |
Kind |
4565859 |
Murai et al. |
Jan 1986 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
0150850 |
Aug 1985 |
EPX |
Non-Patent Literature Citations (1)
Entry |
Daicel Chem., Patent Abstracts of Japan, vol. 13, No. 15 (C-559) Jan. 13, 1989. |
Divisions (1)
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Number |
Date |
Country |
Parent |
504905 |
Apr 1990 |
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