Autodeposition process and composition
AssigneeUnion Carbide Corporation
InventorWilbur S. Hall
Life of this patent
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Abstract
An acidic aqueous coating composition having dispersed therein solid resin particles and of the type which forms on a metallic surface immersed therein a resinous coating which increases in thickness or weight the longer the time the surface is immersed in said composition, said composition being characterized by having therein (A) particles of resin which are prepared by polymerizing (i) a conjugated diene, (ii) CH.sub.2 .dbd.CHR wherein R is an aryl or cyano group, (iii) a vinyl halide, and (iv) a monoethylenically unsaturated monomer having a functional group or (B) resin particles which are substantially chemically and physically homogeneous, and wherein said composition has little or no surfactant in the aqueous phase of the composition.
Claims55
An acidic aqueous coating composition of the type which is effective in forming on a metallic surface immersed therein a resinous coating which increases in weight or thickness the longer said surface is immersed in said composition in the absence of any electrical charge on said metallic surface other than that which may be imparted thereto by said composition and characterized by the presence therein of resin particles which are:
- (A) prepared by polymerizing (i) a conjugated diene, (ii) CH.sub.2 .dbd.CH--R wherein R is an aryl or cyano group, (iii) a vinylidene halide, and (iv) a monoethylenically unsaturated monomer having a functional group selected from the class consisting of amide and carboxyl groups;
- and/or
- (B) substantially chemically and physically homogeneous,
- wherein the concentration of surfactant, if any, in the aqueous phase of said composition is below the critical micelle concentration.
An acidic aqueous coating composition which is effective in forming on a metallic surface immersed therein a resinous coating which increases in weight or thickness the longer said surface is immersed in said composition in the absence of any electrical charge on said metallic surface other than that which may be imparted thereto by said composition, said composition comprising:
- (A) about 5 to about 550 g/l of resin solids selected from the class consisting of resin particles prepared by polymerizing (i) a conjugated diene, (II) CH.sub.2 .dbd.CH--R wherein R is an aryl or cyano group, (iii) a vinylidene halide, and (iv) a monoethylenically unsaturated monomer having a functional group selected from the class consisting of amide and carboxyl groups;
- and resin particles which are substantially chemically and physically homogeneous;
- (B) a ferric-containing compound which is soluble in the composition in an amount equivalent to about 0.025 to about 3.5 g/l of ferric iron;
- and
- (C) acid in an amount sufficient to impart to the composition a pH within the range of about 1.6 to about 5,
- wherein the concentration of surfactant, if any, in the aqueous phase of said composition is below the critical micelle concentration.
An acidic aqueous coating composition which is effective in forming on a metallic surface immersed therein a resinous coating which increases in weight or thickness the longer said surface is immersed in said composition in the absence of any electrical charge on said metallic surface other than that which may be imparted thereto by said composition, said composition comprising:
- (A) about 50 to about 100 g/l of cross-linked resin solids selected from the class consisting of resin particles prepared by polymerizing (i) a conjugated diene, (ii) CH.sub.2 .dbd.CH--R wherein R is an aryl or cyano group, (iii) a vinylidene halide, and (iv) a monoethylenically unsaturated monomer having a functional group selected from the class consisting of amide and carboxyl groups;
- and resin particles which are substantially chemically and physically homogeneous;
- (B) ferric fluoride in an amount such that it contains the equivalent of about 0.5 to about 3.5 g/l of ferric iron;
- (C) about 0.2 to about 5 g/l of HF;
- and wherein the pH of said composition is within the range of about 1.6 to about 4,
- wherein the concentration of surfactant, if any, in the aqueous phase of the composition is below the critical micelle concentration.
A process for preparing an autodepositing composition from an aqueous resin/pigment concentrate comprising combining an aqueous resin/pigment concentrate consisting essentially of:
- (A) about 350 to about 550 g/l of resin particles selected from the class consisting of resin particles prepared by polymerizing (i) a conjugated diene, (ii) CH.sub.2 .dbd.CH--R wherein R is an aryl or cyano group, (iii) a vinylidene halide, and (iv) a monoethylenically unsaturated monomer having a functional group selected from the class consisting of amide and carboxyl groups;
- and resin particles which are substantially chemically and physically homogeneous;
- and
- (B) about 10 to about 550 g/l of pigment;
- with other constituents of said autodepositing composition, including acid, oxidizing agent and additional water;
- wherein the concentration of surfactant, if any, in the aqueous phase of said composition is below the critical micelle concentration.
An acidic aqueous coating composition of the type which is effective in forming on a metallic surface immersed therein a resinous coating which increases in weight or thickness the longer said surface is immersed in said composition in the absence of any electrical charge on said metallic surface other than that which may be imparted thereto by said composition, including as activating ingredients ferric iron and fluoride, and including also dispersed pigment, and characterized by the presence therein of anionically dispersed resin particles which are prepared by polymerizing (i) a conjugated diene, (ii) CH.sub.2 .dbd.CH--R wherein R is an aryl or cyano group, (iii) a vinylidene halide, and (iv) a monoethylenically unsaturated monomer having a functional group selected from the class consisting of amide and carboxyl groups, wherein the concentration of surfactant, if any, in the aqueous phase of said composition is below the critical micelle concentration.
An acidic aqueous coating composition of the type which is effective in forming on a metallic surface of immersed therein a resinous coating which increases in weight or thickness the longer said surface is immersed in said composition in the absence of any electrical charge on said metallic surface other than that which may be imparted thereto by said composition, including as activating ingredients ferric iron and fluoride, and including also dispersed pigment, and characterized by the presence therein of anionically dispersed resin particles which are substantially chemically and physically homogeneous, wherein the concentration of surfactant, if any, in the aqueous phase of said composition is below the critical micelle concentration.
Dependencies are inferred from the claim text.