Patent US4579889A successfully refreshed from Google Patents.
US4579889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Stabilized cationic latex
Assignee: Lilly Industries Inc
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Filing: 1985-03-27
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Granted: 1986-04-01
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Expires: 2005-03-27
Abstract
Abstract Mechanical stability and coating characteristics of structurally cation-active, film-forming latex, especially useful in electrodeposition coatings can be improved by the addition of small stabilizing amounts of linear cationic amine-modified epoxy resin having tertiary amine functionality and base number in the range of 30-500. Such stabilized latex remain substantially non-agglomerated even after being subjected to pumping and shear. The improved latex and process circumvent the purification steps, i.e. ion exchange and also ultrafiltration, often required treatments to render latex compositions suitable for electrodeposition coatings. The thickness of the film electrodeposited on the metal can be controlled by proper selection of the stabilizer amount and/or system voltage.
Inventors
- 👤 Sharon L. Kaffen
- 👤 Victoria A. Drexler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 20:05
CPC Classifications
C; C09; C09D; C09D5/00; C09D5/44; C09D5/4407; Y; Y10; Y10S; Y10S524/00; Y10S524/901
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
181 words
A latex composition which comprises a major amount of structured cation-active latex formed by emulsion polymerization of various vinyl monomers in an aqueous medium and a minor amount of from about 0.5 to 25 weight percent basis latex solids of a substantially oxirane-free, cationic resin adduct sufficient to impart mechanical and shear stability to said latex; wherein said cationic resin adduct is an amine-modified epoxy resin salt resulting from the reaction of an oligomer selected from the group consisting of polyether, polyester, polyamide, polyepoxide, or polyamine or mixtures thereof having at least one reactive epoxide ring with an amine having at least one amino hydrogen capable of reacting with said epoxide to form said adduct; wherein said oligomer has a molecular weight of from about 400 to 1,500; said resin and said adduct are at least partially neutralized with an inorganic or organic acid; and wherein the stability of said latex is evidenced by the lack of substantial particle agglomeration in a disc centrifuge photosedimentometer trace after subjecting said latex to stress mixing for a period of at least 30 minutes.
Claim 2
Dependent Claim
181 words
A latex composition which comprises a major amount of structured cation-active latex formed by emulsion polymerization of various vinyl monomers in an aqueous medium and a minor amount of from about 0.5 to 25 weight percent basis latex solids of a substantially oxirane-free, cationic resin adduct sufficient to impart mechanical and shear stability to said latex; wherein said cationic resin adduct is an amine-modified epoxy resin salt resulting from the reaction of an oligomer selected from the group consisting of polyether, polyester, polyamide, polyepoxide, or polyamine or mixtures thereof having at least one reactive epoxide ring with an amine having at least one amino hydrogen capable of reacting with said epoxide to form said adduct; wherein said oligomer has a molecular weight of from about 400 to 1,500; said resin and said adduct are at least partially neutralized with an inorganic or organic acid; and wherein the stability of said latex is evidenced by the lack of substantial particle agglomeration in a disc centrifuge photosedimentometer trace after subjecting said latex to stress mixing for a period of at least 30 minutes.
Claim 3
Dependent Claim
31 words
The composition according to claim 1 wherein the resin oligomer is a polyether epoxide added in an amount of from about 2.0 to about 12 weight percent basis total resin solids.
Claim 4
Dependent Claim
39 words
The composition according to claim 1 wherein the cationic resin adduct is a dispersion of the reaction product of a diamine reacted in part with a multifunctional epoxy terminated polyether and in part with an C 4-20 alkyl monoepoxide.
Claim 5
Dependent Claim
40 words
The composition according to claim 3 wherein the diamine is dimethylaminopropylamine, which is first partially reacted with bisphenol A derived polyether epoxide, and then further reacted with an α-olefin epoxide and the said resin is neutralized with an organic acid.
Claim 6
Dependent Claim
55 words
The composition according to claim 3 wherein the cationic latex is an acrylic resin having cationic functionality derived from an amino containing monomer copolymerized in the preparation of said latex by emulsion polymerization in an aqueous environment with one or more esters selected from the gorup consisting of acrylic acid esters and methacrylic acid esters.
Claim 7
Dependent Claim
37 words
The composition of claim 5 wherein the said latex is a copolymer containing acrylate and/or methacrylate monomer units, monomer units having secondary and/or tertiary amino functionality, and/or vinyl unsaturated hydrocarbon monomers and hydroxyalkyl acrylate or methacrylate monomers.
Claim 8
Dependent Claim
27 words
The composition of according to any one of claims 4-6 which further includes particulate material in the nature of pigment, filler, plastic pigment and/or powder paint particles.
Claim 9
Dependent Claim
21 words
The composition of claim 6 which further includes crosslinking agents adapted for reaction with said hydroxy functional acrylate or methacrylate monomers.
Claim 10
Dependent Claim
146 words
A process for preparing a mechanically stable cationic latex suitable for coating application having a major amount of cationic latex and a minor stabilizing amount of a substantially neutralized cationic resin adduct which comprises: a. forming a cationic latex by the emulsion polymerization of vinyl monomers in an aqueous medium; b. forming an amine-modified epoxy resin adduct by first reacting a lower molecular weight C 4-20 diamine with a multifunctional epoxide terminated polyether to produce an intermediate adduct having a residual amount of reactive N--H linkages suitable for further reaction with an epoxide and thereafter reacting the intermediate adduct with a C 3-20 alkyl epoxide in an amount sufficient to react substantially all the amino hydrogen linkages; c. neutralizing said amine-modified resin adduct with an inorganic or organic acid; d. combining the cationic latex with said neutralized adduct in an amount sufficient to stabilize the latex.
Claim 11
Dependent Claim
146 words
A process for preparing a mechanically stable cationic latex suitable for coating application having a major amount of cationic latex and a minor stabilizing amount of a substantially neutralized cationic resin adduct which comprises: a. forming a cationic latex by the emulsion polymerization of vinyl monomers in an aqueous medium; b. forming an amine-modified epoxy resin adduct by first reacting a lower molecular weight C 4-20 diamine with a multifunctional epoxide terminated polyether to produce an intermediate adduct having a residual amount of reactive N--H linkages suitable for further reaction with an epoxide and thereafter reacting the intermediate adduct with a C 3-20 alkyl epoxide in an amount sufficient to react substantially all the amino hydrogen linkages; c. neutralizing said amine-modified resin adduct with an inorganic or organic acid; d. combining the cationic latex with said neutralized adduct in an amount sufficient to stabilize the latex.
Claim 12
Independent Claim
53 words
A method of electrocoating an electrically conductive surface serving as a cathode in an electrical circuit comprising said cathode, an anode, and an aqueous electrodepositable composition wherein the electrodepositable composition comprises the composition which comprises passing an electric current between said cathode and anode and of any one of claims 1,3-5 or 6.
Claim 13
Dependent Claim
37 words
The method of claim 10 wherein said latex is a copolymer derived from acrylate and/or methacrylate monomer units, monomer units having secondary and/or tertiary amino functionality, and/or vinyl unsaturated hydrocarbon monomers and hydroxyalkyl acrylate or methacrylate monomers.
Claim 14
Dependent Claim
9 words
An article coated by the method of claim 10.
Claim 15
Dependent Claim
30 words
A cathodic electrocoating bath comprising a composition of claim 1 which contains protic acid ionizing agent and up to about 30% binder solids comprising said latex and said resin adduct.
Claim 16
Dependent Claim
35 words
A replenishment composition for the bath of claim 13, said replenishment composition being like that of said bath except that it is richer in latex binder solids and leaner in ionizing acid than said bath.
Claim 17
Dependent Claim
25 words
The method of claim 11 wherein said electrodepositable composition further includes particulate material in the nature of pigment, filler, plastic pigment and/or powder paint articles.
Claim 18
Dependent Claim
127 words
A coating composition suitable for deposit on a metal substrate by electrodeposition comprising a cationic latex and a minor amount of from about 0.5 to about 25 weight percent, basis latex solids of one or more amine resin adduct selected from the group consisting of polyether-amine, polyether epoxy-amine, polyamide, polyamine, and mixtures thereof sufficient to impart mechanical stability to said latex and wherein the amine resin and said latex are at least partially neutralized with a protonic acid wherein said amine adduct are effective agents for removing, complexing or otherwise fixing lower molecular amine monomers, ions or fragments which are residual in the latex following latex preparation by polymerization of monomers in the presence of amine monomers and free radical catalysts and detrimental to the electrocoating process.
Claim 19
Dependent Claim
127 words
A coating composition suitable for deposit on a metal substrate by electrodeposition comprising a cationic latex and a minor amount of from about 0.5 to about 25 weight percent, basis latex solids of one or more amine resin adduct selected from the group consisting of polyether-amine, polyether epoxy-amine, polyamide, polyamine, and mixtures thereof sufficient to impart mechanical stability to said latex and wherein the amine resin and said latex are at least partially neutralized with a protonic acid wherein said amine adduct are effective agents for removing, complexing or otherwise fixing lower molecular amine monomers, ions or fragments which are residual in the latex following latex preparation by polymerization of monomers in the presence of amine monomers and free radical catalysts and detrimental to the electrocoating process.
Claim 20
Dependent Claim
53 words
A process for improving the electrodeposition of film-forming, cation-active, amino-stabilized latex containing a minor proportion of cation-active low molecular weight substance which comprises contacting said low molecular weight substance in said latex with a substantially oxirane-free amine resin adduct of claim 1 having a Base No. of from about 30 to about 500.
Claim 21
Dependent Claim
39 words
A process for controlling film thickness of emulsion polymerized cathodic latex electrocoated on metal substrate which comprises adding to said latex from about 1.0 to about 15.0 weight percent, basis latex solids of cationic resin adduct of claim 1.
Claim 22
Dependent Claim
26 words
The process of claim 18 which comprises varying the voltages of the electrocoating system and stabilizer content to control film thickness on the electrocoated metal substate.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |