US4094841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly monodisperse latexes of non-film forming polymers
Assignee: Dow Chemical Co
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Filing: 1974-06-17
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Granted: 1978-06-13
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Expires: 1994-06-17
Abstract
Abstract Highly monodisperse latexes of non-film forming polymers are prepared by (1) dispersing a hard monomer and an ethylenically unsaturated amide in an aqueous medium containing a surfactant in an amount less than the critical micelle concentration of the surfactant and (2) subjecting the dispersion to emulsion polymerization. Such monodisperse latexes are useful as opacifying pigments in paper coatings, as internal calibration standards in electron microscopy, and as model systems for study of colloidal properties.
Inventors
- 👤 Inder Mani
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 07:45
CPC Classifications
D; D21; D21H; D21H19/00; D21H19/36; D21H19/44; D21H19/56; D21H19/58; C; C08; C08F; C08F2/00; C08F2/44; C09; C09D; C09D125/00; C09D125/02; C09D125/04; C09D125/08; C09D133/00; C09D133/04; C09D133/06; C09D133/062; D21H19/38; D21H19/42
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
77 words
A highly monodisperse latex of a water-insoluble copolymer of an emulsion polymerizable α,β-ethylenically unsaturated hard monomer and at least about one weight percent of an emulsion polymerizable α,β-ethylenically unsaturated amide selected from the group consisting of acrylamide, methacrylamide, fumaric amide, maleic amide, itaconic amide, and citraconic amide; said copolymer being in the form of non-film forming discrete particles having an average particle diameter in the colloidal range with a standard particle size deviation less than 2 percent.
Claim 2
Dependent Claim
77 words
A highly monodisperse latex of a water-insoluble copolymer of an emulsion polymerizable α,β-ethylenically unsaturated hard monomer and at least about one weight percent of an emulsion polymerizable α,β-ethylenically unsaturated amide selected from the group consisting of acrylamide, methacrylamide, fumaric amide, maleic amide, itaconic amide, and citraconic amide; said copolymer being in the form of non-film forming discrete particles having an average particle diameter in the colloidal range with a standard particle size deviation less than 2 percent.
Claim 3
Dependent Claim
108 words
A method for preparing the latex of claim 1 which method comprises the steps (1) dispersing the hard monomer and the amide in an aqueous phase containing surfactant in an amount which is from about 0.1 to about 0.75 of the critical micelle concentration of the surfactant, said hard monomer being inert to said amide and the proportion of said amide to said hard monomer being sufficient to provide a water-insoluble copolymer containing at least one weight percent of the amide; and (2) subjecting the dispersion to emulsion polymerization conditions such that at least a stabilizing amount of the amide is present in the aqueous phase during polymerization.
Claim 4
Dependent Claim
14 words
The method of claim 2 wherein the hard monomer is a monovinylidene aromatic monomer.
Claim 5
Dependent Claim
11 words
The method of claim 2 wherein the hard monomer is styrene.
Claim 6
Dependent Claim
12 words
The method of claim 1 wherein the hard monomer is methyl methacrylate.
Claim 7
Dependent Claim
10 words
The method of claim 2 wherein the amide is acrylamide.
Claim 8
Dependent Claim
31 words
The latex of claim 1 containing from about 1 to about 30 weight percent based on the water-insoluble copolymer of a water soluble copolymer of the hard monomer and the amide.
Claim 9
Dependent Claim
20 words
The latex of claim 7 wherein the water insoluble copolymer and water soluble copolymer are copolymers of styrene and acrylamide.
Claim 10
Dependent Claim
15 words
The latex of claim 8 wherein said standard particle size deviation is less than 1%.
Claim 11
Dependent Claim
12 words
The method of claim 2 wherein the surfactant is dihexyl sodium sulfosuccinate.
References Cited (Backward Citations)
US2647109A
Cited
US2706192A
Cited
US3207732A
Cited
US3271341A
Cited
US3255139A
Cited
US3297613A
Cited
US3350336A
Cited
US3664912A
Cited
US3865773A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-12 | 1981-12-12 | 1982-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-12 | 1985-12-12 | 1986-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-12 | 1989-12-12 | 1990-06-13 | $7700.00 | Window Closed / Lapsed |