US4424298A
Expired / Lapsed
US
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Preparation of concentrated polyacrylate dispersions
Assignee: BASF SE
•
Filing: 1982-04-28
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Granted: 1984-01-03
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Expires: 2002-04-28
Abstract
Abstract Emulsion copolymerization of acrylic or methacrylic acid esters with from 0.3 to 10% by weight of α,β-monoolefinically unsaturated monocarboxylic acids and/or dicarboxylic acids and/or their amides, with or without up to 25% by weight of styrene, acrylonitrile, vinyl acetate and/or vinyl chloride, using the emulsion feed process, gives particularly concentrated copolymer dispersions if an emulsifier system of 0.01-5.0% by weight of a sulfuric acid half-ester of an oxyalkylated alkylphenol and 0.01-1% by weight of a dialkyl sulfosuccinate, where alkyl is of 6 to 18 carbon atoms, is employed and the polymerization is carried out at pH 2-6.
Inventors
- 👤 Erich Penzel
- 👤 Guenter Eckert
- 👤 Lothar Heider
- 👤 Lothar Wuertele
- 👤 Werner Schackert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:31
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
148 words
A process for the preparation of a concentrated polyacrylate dispersion consisting of polymerization of 65-97 percent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, 0.3-10 percent by weight of α, β-monoolefinically unsaturated monocarboxylic and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their amides and 0-25 percent by weight of monomers from the group consisting of styrene, acrylonitrile, vinyl acetate and vinyl chloride, in aqueous emulsion at pH 2-6 in the presence of 0.01-5.0 percent by weight, based on monomers, of the sulfuric acid half-ester of an adduct of an alkylphenol, alkyl being of 8 to 9 carbon atoms, with 5-50 moles of ethylene oxide and 0.01-1 percent by weight, based on monomers, of a dialkyl sulfosuccinate, alkyl being of 6 to 18 carbon atoms, and conventional water-soluble free radical initiators at 30°-95° C., by the emulsion feed process.
Claim 2
Dependent Claim
148 words
A process for the preparation of a concentrated polyacrylate dispersion consisting of polymerization of 65-97 percent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, 0.3-10 percent by weight of α, β-monoolefinically unsaturated monocarboxylic and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their amides and 0-25 percent by weight of monomers from the group consisting of styrene, acrylonitrile, vinyl acetate and vinyl chloride, in aqueous emulsion at pH 2-6 in the presence of 0.01-5.0 percent by weight, based on monomers, of the sulfuric acid half-ester of an adduct of an alkylphenol, alkyl being of 8 to 9 carbon atoms, with 5-50 moles of ethylene oxide and 0.01-1 percent by weight, based on monomers, of a dialkyl sulfosuccinate, alkyl being of 6 to 18 carbon atoms, and conventional water-soluble free radical initiators at 30°-95° C., by the emulsion feed process.
Claim 3
Dependent Claim
142 words
The process for the preparation of a concentrated polyacrylate dispersion according to claim 1, wherein 65-97 percent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, 0.5-7.5 percent by weight of α, β-monoolefinically unsaturated monocarboxylic and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their amides and 0-25 percent by weight of monomers from the group consisting of styrene, acrylonitrile, vinyl acetate and vinyl chloride are polymerized in aqueous emulsion at pH 3-5 in the presence of 0.1-0.5 percent by weight, based on monomers, of the sulfuric acid half-ester of an adduct of an alkylphenol, alkyl being of 8 to 9 carbon atoms, with 20-30 moles of ethylene oxide and 0.1-0.5 percent by weight, based on monomers, of di-2-ethylhexyl sulfosuccinate and conventional water-soluble free radical initiators at 50°-85° C. by the emulsion feed process.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-02 | 1987-07-04 | 1988-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-02 | 1991-07-04 | 1992-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-02 | 1995-07-04 | 1996-01-03 | $7700.00 | Window Closed / Lapsed |