Abstract: It is an object of the present invention to provide a water-borne resin composition which can form a film being excellent in flexibility and heat resistance without reducing an insulating property and can be used suitably for a cationic electrocoating composition. A water-borne resin composition, having a hydrolysable functional group and a polymerizable unsaturated carbon bond, wherein a base resin is at least one species selected from the group consisting of a polyamide-imide resin, a polyamide resin and a polyimide resin.

Abstract: It is an object of the present invention to provide a water-borne resin composition which can form a film being excellent in flexibility and heat resistance without reducing an insulating property and can be used suitably for a cationic electrocoating composition. A water-borne resin composition, having a hydrolysable functional group and a polymerizable unsaturated carbon bond, wherein a base resin is at least one species selected from the group consisting of a polyamide-imide resin, a polyamide resin and a polyimide resin.

Abstract: It is an object of the present invention to provide a water-borne resin composition which can form a film being excellent in flexibility and heat resistance without reducing an insulating property and can be used suitably for a cationic electrocoating composition. A water-borne resin composition, having a hydrolysable functional group and a polymerizable unsaturated carbon bond, wherein a base resin is at least one species selected from the group consisting of a polyamide-imide resin, a polyamide resin and a polyimide resin.

Abstract: It is an object of the present invention to provide a water-borne resin composition which can form a film being excellent in flexibility and heat resistance without reducing an insulating property and can be used suitably for a cationic electrocoating composition. A water-borne resin composition, having a hydrolysable functional group and a polymerizable unsaturated carbon bond, wherein a base resin is at least one species selected from the group consisting of a polyamide-imide resin, a polyamide resin and a polyimide resin.

Abstract: A resin composition comprises a resin (A) and a resin (B) as constituents, said resin (A) having a number average molecular weight of 1,000 to 35,000 and being at least one member selected from the group consisting of following (A1) and (A2): (A1) a polyester polyol, a polyether polyol, a polycarbonate polyol, a polyurethane polyol, a polyolefin polyol and an acrylic polyol, (A2) a polymer obtained by reacting said (A1) with a compound having at least one functional group selected from the group consisting of isocyanato, carboxyl and epoxy groups within a molecule thereof, a dialkyl carbonate, a cyclic carbonate, an alcohol, or a mixture of these, and said resin (B) having a sulfonium group and a propargyl group within the molecule thereof.

Abstract: It is an object of the present invention to provide a method of forming a coating film by which a coating film excellent in weathering resistance, light degradation resistance, smoothness and the like can be formed on the outer panel portion of an article to be coated such as a car, and a coating film excellent in rust prevention can be formed on the inner panel portion (bag-structured portion) of the article to be coated, with the interface between the outer and inner panel portions of the article being excellent in rust prevention and finish as well, and by which resources saving and coating cost reduction can be expected.

Abstract: An electrodeposition coating composition that is excellent in bath stability and that can give a cured film enhanced in hardness and an electrodeposition coating process is provided. An electrodeposition coating composition to be used in an electrodeposition coating process which comprises the electrodeposition step of immersing a substrate in an electrodeposition coating composition and applying a voltage between the substrate as an anode or cathode and a counter electrode to thereby form a film of said electrodeposition coating composition on the surface of the substrate, and the heating step of heating said film obtained in the above electrodeposition step, and said electrodeposition coating composition comprising having electrodeposition potentiality against the curing reaction of said film.

Abstract: It is an object of the present invention to provide a resin composition excellent in throwing power as well as corrosion prevention and capable of providing coating films excellent in impact resistance, and a cationic electrodeposition coating composition containing the resin composition.

Abstract: It is an object of the present invention to provide a cationic electrocoating method capable of producing a coating film with high filiform-rust resistance, corrosion resistance, and rust prevention and a coated article obtainable by the method.

Abstract: A method for forming double-layer coatings excellent in smoothness and resistant to yellowing is provided which comprises electrodepositing a cationic electrodeposition coating composition to form an uncured cationically electrodeposited coating, applying an intermediate coating composition to said uncured coating to form an uncured intermediate coating, and heating both uncured coatings simultaneously, said cationic electrodeposition coating composition containing a sulfonium group- and propargyl group-containing resin composition.

Abstract: It is an object of the present invention to provide a method of forming a coating film by which a coating film excellent in weathering resistance, light degradation resistance, smoothness and the like can be formed on the outer panel portion of an article to be coated such as a car, and a coating film excellent in rust prevention can be formed on the inner panel portion (bag-structured portion) of the article to be coated, with the interface between the outer and inner panel portions of the article being excellent in rust prevention and finish as well, and by which resources saving and coating cost reduction can be expected.

Abstract: A process for cationic electrodeposition coating which comprises the steps of: (1) immersing a substrate in a cationic electrodeposition coating composition: (2) applying a voltage between an anode and said substrate, which serves as a cathode, to thereby cause coat film deposition; and (3) further applying a voltage to the coat film deposited so as to increase electric resistance per unit volume of said coat film, wherein, in said step (3), coat films are deposited at those sites of the substrate where coat films have not yet been deposited, said cationic electrodeposition coating composition having a time point when the electric resistance per unit volume of the coat film deposited increases in the course of electrodeposition under constant-current conditions.

Abstract: An acetylide-form propargyl-containing resin composition for cationic electrocoating, which comprises a resin having a skeleton of epoxy resin and has a number average molecular weight of 500 to 20,000, and which contains, per 100 grams of the resin composition solids, 5 to 400 millimoles of sulfonium group and 10 to 495 millimoles of propargyl group, the total content of the sulfonium and propargyl groups being not more than 500 millimoles per 100 grams of the resin composition solids, said propargyl group being partly in the form of an acetylide. This resin composition may further contain unsaturated double bond.

Abstract: A method for forming double-layer coatings excellent in smoothness and resistant to yellowing is provided which comprises electrodepositing a cationic electrodeposition coating composition to form an uncured cationically electrodeposited coating, applying an intermediate coating composition to said uncured coating to form an uncured intermediate coating, and heating both uncured coatings simultaneously, said cationic electrodeposition coating composition containing a sulfonium group- and propargyl group-containing resin composition.

Abstract: It is an object of the present invention to provide a cationic electrodeposition coating composition which is free of toxic rust-preventive pigments such as lead compounds and capable of giving coating films having high resistance to corrosion and rusting, even when applied to a substrate surface which is only insufficiently subjected, to a chemical conversion treatment. The present invention provides a cationic electrodeposition coating composition which comprises a rust inhibitor comprising at least one compound selected from the group consisting of compounds containing any of elemental metals belonging to the period 4, 5 or 6 of group 3 of the periodic table and a sulfonium- and propargyl group-containing resin composition. For, example, the content of said rust inhibitor is 0.03 to 10 weight parts in terms of the elemental metal in the rust inhibitor based on 100 weight parts of the solid resins in the resin composition.

Abstract: An electrodeposition coating composition that is excellent in bath stability and that can give a cured film enhanced in hardness and an electrodeposition coating process is provided.

Abstract: It is an object of the present invention to provide a cationic electrodeposition coating composition which is free of toxic rust-preventive pigments such as lead compounds and capable of giving coating films having high resistance to corrosion and rusting, even when applied to a substrate surface which is only insufficiently subjected, to a chemical conversion treatment.

Abstract: The present invention has for its object to provide a basic cationic electrodeposition coating composition with does not detract from either storage stability or bath stability even though it is basic and which does not make the coating equipment such as the electrodeposition tank and associated piping corroded, and a method for producing it. The present invention is directed to a basic cationic electrodeposition coating composition having a hydrogen ion concentration within the range of 7.5 to 12.0 in terms of hydrogen ion exponent (pH), and a method for producing it.

Abstract: An acetylide-form propargyl-containing resin composition for cationic electrocoating, which comprises a resin having a skeleton of epoxy resin and has a number average molecular weight of 500 to 20,000, and which contains, per 100 grams of the resin composition solids, 5 to 400 millimoles of sulfonium group and 10 to 495 millimoles of propargyl group, the total content of the sulfonium and propargyl groups being not more than 500 millimoles per 100 grams of the resin composition solids, said propargyl group being partly in the form of an acetylide. This resin composition may further contain unsaturated double bond.

Abstract: An aliphatic hydrocarbon group-containing resin composition for cationic electrocoating, which comprises a resin having a skeleton of epoxy resin and has a number average molecular weight of 500 to 20,000, and which contains, per 100 grams of the nonvolatile matter in said resin composition, (a) 5 to 400 millimoles of sulfonium group, (b) 80 to 355 millimoles of at least one aliphatic hydrocarbon group containing 8 to 24 carbon atoms and optionally containing unsaturated double bond within its chain, and (c) 10 to 315 millimoles of at least one member selected from among propargyl group and a terminal unsaturated double bond-containing organic group containing 3 to 7 carbon atoms; the total content of said (a), said (b) and said (c) being not more than 500 millimoles per 100 grams of the nonvolatile matter in said resin composition.