US4042478A — Process for electrocoating an aqueous composition…

Claim 1

Independent Claim 220 words

In the process for electrocoating a film-forming polymer composition on the anode of an electrocoating cell, said anode consisting of a metal article, by immersing said anode in a coating bath containing uniformly dispersed constituents, passing direct current through said cell to deposit a coating on the anode, removing the coated anode from the bath and baking the coated anode to form a continuous film thereon, the improvement therewith comprises utilizing a coating bath of an aqueous coating composition having a pH of about 7.2-10 comprising 5-50% by weight of film-forming constituents uniformly dispersed in an aqueous medium; wherein the film-forming constituents consist essentially of a. 50-97% by weight, based on the weight of the film-forming constituents, of a polymer which is the reaction product of 1. an epoxy ester resin of an epoxy resin of the formula ##STR5## where R is an alkylene group having 1-4 carbon atoms and m is a positive integer sufficiently large to provide a Gardner Holdt viscosity of A to Z 5 measure at 25° C. on a 40% weight solids polymer solution using ethylene glycol monobutyl ether solvent; and drying oil fatty acids selected from the group consisting of linseed oil fatty acids, tung oil fatty acids, dehydrated castor oil fatty acids, soya oil fatty acids and tall oil fatty acids; and 2.

Claim 2

Dependent Claim 220 words

In the process for electrocoating a film-forming polymer composition on the anode of an electrocoating cell, said anode consisting of a metal article, by immersing said anode in a coating bath containing uniformly dispersed constituents, passing direct current through said cell to deposit a coating on the anode, removing the coated anode from the bath and baking the coated anode to form a continuous film thereon, the improvement therewith comprises utilizing a coating bath of an aqueous coating composition having a pH of about 7.2-10 comprising 5-50% by weight of film-forming constituents uniformly dispersed in an aqueous medium; wherein the film-forming constituents consist essentially of a. 50-97% by weight, based on the weight of the film-forming constituents, of a polymer which is the reaction product of 1. an epoxy ester resin of an epoxy resin of the formula ##STR5## where R is an alkylene group having 1-4 carbon atoms and m is a positive integer sufficiently large to provide a Gardner Holdt viscosity of A to Z 5 measure at 25° C. on a 40% weight solids polymer solution using ethylene glycol monobutyl ether solvent; and drying oil fatty acids selected from the group consisting of linseed oil fatty acids, tung oil fatty acids, dehydrated castor oil fatty acids, soya oil fatty acids and tall oil fatty acids; and 2.

Claim 3

Dependent Claim 106 words

a malenized drying oil which is the reaction product of maleic anhydride and a drying oil selected from the group consisting of linseed oil, tung oil, dehydrated caster oil, soya oil and tall oil; and b. 3-50% by weight, based on the weight of the film-forming constituents, of a water dispersible cross-linking agent selected from the group consisting of phenol formaldehyde, urea formaldehyde, methylated urea formaldehyde, melamine formaldehyde, alkylated melamine formaldehyde having 1-4 carbon atoms in the alkyl group and benzoguanamine formaldehyde; wherein the composition contains sufficient basic compound to have said pH and wherein the basic compound is selected from the group consisting of an

Claim 4

Dependent Claim 106 words

a malenized drying oil which is the reaction product of maleic anhydride and a drying oil selected from the group consisting of linseed oil, tung oil, dehydrated caster oil, soya oil and tall oil; and b. 3-50% by weight, based on the weight of the film-forming constituents, of a water dispersible cross-linking agent selected from the group consisting of phenol formaldehyde, urea formaldehyde, methylated urea formaldehyde, melamine formaldehyde, alkylated melamine formaldehyde having 1-4 carbon atoms in the alkyl group and benzoguanamine formaldehyde; wherein the composition contains sufficient basic compound to have said pH and wherein the basic compound is selected from the group consisting of an

Claim 5

Dependent Claim 34 words

alkali metal hydroxide, an amine or a polyamine. 2. The process of claim 1 in which the aqueous coating composition contains 0.5-50% by weight, based on the weight of the film-forming constituents, of pigment.

Claim 6

Dependent Claim 13 words

The process of claim 2 in which R is either methylene or isopropylidene.

Claim 7

Dependent Claim 17 words

The process of claim 2 in which the cross-lining agent is benzoguanamine formaldehyde or hexakis (methoxymethyl) melamine.

Claim 8

Dependent Claim 28 words

The process of claim 2 in which the film-forming constituents consist essentially of 60-95% by weight of said polymer; and correspondingly, 5-40% of a water dispersible cross-linking agent.

Claim 9

Dependent Claim 139 words

The process of claim 2 in which the aqueous coating composition has a pH of about 7.5-8.5 and comprises 10-40% by weight of film-forming constituents uniformly dispersed in an aqueous medium; wherein the film-forming constituents consist essentially of a. 60-95% by weight, based on the weight of the film-forming constituents, of a polymer which is the reaction product of 1. an epoxy ester resin of an epoxy resin of the formula ##STR6## wherein m is a positive integer sufficiently large to provide a Gardner Holdt viscosity of D-G measure at 25° C. on a 40% weight solids polymer solution using ethylene glycol monobutyl ether solvent; and drying oil fatty acids selected from the group consisting of linseed oil fatty acids, tung oil fatty acids, dehydrated castor oil fatty acids, soya oil fatty acids and tall oil fatty acids; and

Claim 10

Dependent Claim 108 words

a maleinized drying oil which is the reaction product of maleic anhydride and a drying oil selected from the group consisting of linseed oil, tung oil, dehydrated castor oil, soya oil and tall oil; and the polymer has an acid number of about 30-60 and a Gardner-Holdt viscosity of Z 1 -Z 6 measured at 25° C. on a 75% weight solids polymer solution using ethylene glycol monobutyl ether solvent; and correspondingly, b. 5-40% by weight, based on the weight of the film-forming constituents, of a benzoguanamine formaldehyde or hexakis(mehtoxymethyl) melamine cross-linking agent; and wherein the composition contains sufficient potassium hydroxide or dimethylamino ethanol to have said pH.

Claim 11

Dependent Claim 108 words

a maleinized drying oil which is the reaction product of maleic anhydride and a drying oil selected from the group consisting of linseed oil, tung oil, dehydrated castor oil, soya oil and tall oil; and the polymer has an acid number of about 30-60 and a Gardner-Holdt viscosity of Z 1 -Z 6 measured at 25° C. on a 75% weight solids polymer solution using ethylene glycol monobutyl ether solvent; and correspondingly, b. 5-40% by weight, based on the weight of the film-forming constituents, of a benzoguanamine formaldehyde or hexakis(mehtoxymethyl) melamine cross-linking agent; and wherein the composition contains sufficient potassium hydroxide or dimethylamino ethanol to have said pH.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1980-08-15	1981-02-14	1981-08-16	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1984-08-15	1985-02-14	1985-08-16	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1988-08-15	1989-02-14	1989-08-16	$7700.00	Window Closed / Lapsed

Process for electrocoating an aqueous composition of the reaction product of an epoxy ester resin and a maleinized drying oil blended with a cross-linking agent

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