US4028294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Epoxy modified acrylic latices and method of producing same
Assignee: Valspar Corp
•
Filing: 1975-11-10
•
Granted: 1977-06-07
•
Expires: 1995-11-10
Abstract
Abstract Acrylic latices containing epoxy resins are prepared by emulsion polymerization in which an epoxy resin (polyepoxide) is incorporated into at least one of the monoethylenic monomers, including an epoxy-reactive monomer, and the monomers including the epoxy resin are emulsified into water containing surfactant to provide the oil phase of an oil-in-water emulsion. The monomers are then polymerized in the aqueous emulsion using a free radical polymerization catalyst and a reaction temperature which does not cause premature reaction between the epoxy groups and the reactive monomer. This provides thermosetting latex particles of fine particle size in the presence of less emulsifying agent than is normally needed.
Inventors
- 👤 George L. Brown
- 👤 Michael A. Tobias
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:08
CPC Classifications
C; C08; C08F; C08F283/00; C08F283/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
170 words
A method of producing a thermosetting aqueous latex comprising dissolving a polyepoxide which is a diglycidyl ether of a bisphenol having a molecular weight in the range of 350-4000 into at least one of the monoethylenically unsaturated monomers to be polymerized, said monomers including from 2 to 30% of monoethylenic carboxylic acid, and the balance of said monomers consisting essentially of nonreactive monoethylenic monomers, emulsifying said monomers and polyepoxide in water with the aid of from 0.25-3 parts of surfactant per 100 parts of said monomers, polymerizing said monomers in said aqueous emulsion with the aid of a free radical polymerization catalyst and at a temperature below which said carboxylic acid will react with the epoxy groups of said polyepoxide, the relative proportion of said polyepoxide and said carboxylic acid monomer varying from about a stoichiometrically equivalent amount up to a 50% equivalent excess of said carboxylic acid monomer, and adding ammonia to said latex to provide a pH of 7.0-9.0 to stabilize the latex and catalyze the cure thereof.
Claim 2
Independent Claim
170 words
A method of producing a thermosetting aqueous latex comprising dissolving a polyepoxide which is a diglycidyl ether of a bisphenol having a molecular weight in the range of 350-4000 into at least one of the monoethylenically unsaturated monomers to be polymerized, said monomers including from 2 to 30% of monoethylenic carboxylic acid, and the balance of said monomers consisting essentially of nonreactive monoethylenic monomers, emulsifying said monomers and polyepoxide in water with the aid of from 0.25-3 parts of surfactant per 100 parts of said monomers, polymerizing said monomers in said aqueous emulsion with the aid of a free radical polymerization catalyst and at a temperature below which said carboxylic acid will react with the epoxy groups of said polyepoxide, the relative proportion of said polyepoxide and said carboxylic acid monomer varying from about a stoichiometrically equivalent amount up to a 50% equivalent excess of said carboxylic acid monomer, and adding ammonia to said latex to provide a pH of 7.0-9.0 to stabilize the latex and catalyze the cure thereof.
Claim 3
Dependent Claim
19 words
A method as recited in claim 1 in which the epoxy reactive monomer comprises acrylic acid or methacrylic acid.
Claim 4
Dependent Claim
23 words
A method as recited in claim 1 in which at least 45% of said monomers are nonreactive monoethylenic monomers which produce hard homopolymers.
Claim 5
Dependent Claim
26 words
A method as recited in claim 3 in which said monomers producing hard homopolymers are selected from methyl methacrylate, styrene, vinyl toluene, acrylonitrile and vinyl acetate.
Claim 6
Dependent Claim
44 words
A method as recited in claim 1 in which said polyepoxide is dissolved in said monomers to provide a liquid mixture, said liquid mixture being added incrementally to the water containing said surfactant and said free radical polymerization catalyst, and heated to polymerization temperature.
Claim 7
Dependent Claim
27 words
A method as recited in claim 1 in which said monoethylenic carboxylic acid is present in an amount of from 3 to 15% of the total monomers.
Claim 8
Dependent Claim
12 words
A thermosetting aqueous latex coating composition produced as defined in claim 1.
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) | 1980-06-06 | 1980-12-06 | 1981-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-06 | 1984-12-06 | 1985-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-06 | 1988-12-06 | 1989-06-07 | $7700.00 | Window Closed / Lapsed |