EP0065253B1
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Process for preparing concentrated acrylic dispersions
Assignee: BASF SE
•
Filing: 1982-05-07
•
Granted: 1985-11-21
•
Expires: 2002-05-07
Abstract
Abstract Emulsion copolymerization of acrylic or methacrylic acid esters with from 0.3 to 10% by weight of alpha , beta -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 Dr. Penzel
- 👤 Guenter Dr. Eckert
- 👤 Lothar Dr. Heider
- 👤 Lothar Dr. Wuertele
- 👤 Werner Schackert
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 04:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/10; C08F220/12
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
160 words
A process for the preparation of a concentrated polyacrylate dispersion by polymerization of 65-97 per cent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, 0.3-10 per cent by weight of a, ß-monoolefinically unsaturated monocarboxylic and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their amides, and 0-25 per cent by weight of monomers from the group comprising styrene, acrylonitrile, vinyl acetate and vinyl chloride, in aqueous emulsion at pH 2-6 in the presence of 0.01-5.0 per cent by weight, based on the monomers, of the sulfuric acid half-ester of an adduct of an alkylphenol, alkyl being of 8 or 9 carbon atoms, with 5-50 moles of ethylene oxide and of conventional water-soluble free radical initiators at 30-95 °C, by the emulsion feed process, wherein 0.01-1 per cent by weight, based on the monomers, of a dialkyl sulfosuccinate, alkyl being of 8 to 18 carbon atoms, is used as an additional emulsifier.
Claim 2
Dependent Claim
160 words
A process for the preparation of a concentrated polyacrylate dispersion by polymerization of 65-97 per cent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, 0.3-10 per cent by weight of a, ß-monoolefinically unsaturated monocarboxylic and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their amides, and 0-25 per cent by weight of monomers from the group comprising styrene, acrylonitrile, vinyl acetate and vinyl chloride, in aqueous emulsion at pH 2-6 in the presence of 0.01-5.0 per cent by weight, based on the monomers, of the sulfuric acid half-ester of an adduct of an alkylphenol, alkyl being of 8 or 9 carbon atoms, with 5-50 moles of ethylene oxide and of conventional water-soluble free radical initiators at 30-95 °C, by the emulsion feed process, wherein 0.01-1 per cent by weight, based on the monomers, of a dialkyl sulfosuccinate, alkyl being of 8 to 18 carbon atoms, is used as an additional emulsifier.
Claim 3
Dependent Claim
155 words
A process for the preparation of a concentrated polyacrylate dispersion as claimed in claim 1, wherein 65-97 per cent by weight of acrylic or methacrylic acid esters of alkanols of 1 to 8 carbon atoms, 0.5 bis 7.5 per cent by weight of a, β-monoolefinically unsaturated monocarboxylic and/or dicarboxylic acids of 3 to 5 carbon atoms and/or their amides, and 0-25 per cent by weight of monomers from the group comprising styrene, acrylonitrile, vinyl acetate and vinyl chloride are polymerized in aqueous emulsion at pH 3-5 in the presence of 0.1-0.5 per cent by weight, based on the monomers, of the sulfuric acid half-ester of an adduct of an alkylphenol, alkyl being of 8 or 9 carbon atoms, with 20-30 moles of ethylene oxide and of 0.1-0.5 per cent by weight, based on the monomers, of di-2-ethylhexyl sulfosuccinate as well as of conventional water-soluble free radical initiators, at 50-85 °C by the emulsion feed process.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.