US 5,041,495 AGrant
Aqueous Secondary Dispersion Containing Phosphate Groups
Issue Date:1991-08-20
•11 Claims
Abstract
Aqueous secondary dispersions containing phosphate groups are obtainable by copolymerization of (A) 25-98% by weight of acrylates and/or methacrylates, (B) 1-10% by weight of acrylic and/or methacrylic acid, (C) 1-8% by weight of a compound of the general formula ##STR1## where R.sup.1 and R.sup.2 are each hydrogen and/or a C.sub.1 -C.sub.8 -hydrocarbon radical and Z is a straight-chain or branched C.sub.1 -C.sub.8 -alkylene, and (D) 0-60% by weight of a copolymerizable olefinically unsaturated compound, in an organic solvent, neutralization of the copolymer solution and dilution with water and, if required, removal of solvent by distillation.
Metadata
Assignee
- BASF Aktiengesellschaft
Inventors
- Thomas Schwerzel
- Gerhard Auchter
- Eckehardt Wistuba
Application Information
Application Number:US 5636647
Filing Date:1990-08-06
Priority Date:1987-08-29
Art Unit:155
Classifications
IPC:
C08L 4300
Field of Search:
524807;824;833
Patent Drawings
This patent does not have any drawings.
Description
EXAMPLE 1
173 g of isobutanol were heated to 100.degree. C., while stirring. A mixture of 90 g of styrene, 102 g of n-butyl acrylate, 36 g of acrylic acid, 12 g of an ester of 1 mole of hydroxyethyl methacrylate and 1 mole of orthophosphoric acid and 2.9 g of tert-butyl peroctoate in 5.8 g of isobutanol was added dropwise in the course of 30 minutes. The temperature was kept at 100.degree. C. for a further 45 minutes. A mixture of 174 g of styrene, 186 g of n-butyl acrylate, 3.6 g of tert-butyl peroctoate and 7.2 g of isobutanol was then added dropwise in the course of 3 hours. A further 7.2 g of tert-butyl peroctoate in 14.4 g of isobutanol were added, after which the mixture was diluted with 200 g of isobutanol. 50 g of concentrated aqueous ammonia solution were added, followed by 450 g of water. During distillation under reduced pressure (60.degree. C. and under 50 mbar), a further 760 g of water were run in.
Solids content: 46% by weight.
EXAMPLE 2
173 g of isobutanol were heated to 100.degree. C., while stirring. A mixture of 96 g of styrene, 108 g of n-butyl acrylate, 24 g of acrylic acid, 12 g of an ester of 1 mole of hydroxyethyl methacrylate and 1 mole of orthophosphoric acid, 2.9 g of tert-butyl peroctoate and 5.8 g of isobutanol was added dropwise in the course of 30 minutes. The temperature was kept at 100.degree. C. for a further 45 minutes. A mixture of 174 g of styrene, 186 g of n-butyl acrylate, 3.6 g of tert-butyl peroctoate and 72 g of isobutanol was then added dropwise in the course of 3 hours. 7.2 g of tert-butyl peroctoate in 14.4 g of isobutanol were then added, after which the mixture was diluted with 23 g of isobutanol. 36.4 g of concentrated ammonia were added, followed by 424 g of water. During distillation under reduced pressure (at 60.degree. C. and under 50 mbar), a further 760 g of water were run in.
Solids content: 40% by weight.
COMPARATIVE EXAMPLE
173 g of isobutanol were heated to 100.degree. C., while stirring. A mixture of 96 g of styrene, 108 g of n-butyl acrylate, 36 g of acrylic acid, 2.9 g of tert-butyl peroctoate and 5.8 g of isobutanol was added dropwise in the course of 30 minutes. The temperature was kept at 100.degree. C. for a further 45 minutes. A mixture of 174 g of styrene, 186 g of n-butyl acrylate, 3.6 g of tert-butyl peroctoate and 7.2 g of isobutanol was then added dropwise in the course of 3 hours. 7.2 g of tert-butyl peroctoate in 14.4 g of isobutanol were then added, after which the mixture was diluted with 57 g of isobutanol. 40.8 g of concentrated ammonia were added, followed by 419 g of water. During distillation under reduced pressure (at 60.degree. C. and under 50 mbar), a further 398 g of water were run in.
Solids content: 46.6% by weight. Test of stability to active pigment:
Experiment 1
30 g of zinc molybdenum phosphate were stirred into 100 g of the dispersion from Example 1. The sample showed no change even after storage for several weeks.
Experiment 2
30 g of zinc molybdenum phosphate were stirred into 100 g of the dispersion from Example 2. The sample showed no change even after storage for several weeks.
COMPARATIVE EXPERIMENT
30 g of zinc molybdenum phosphate were stirred slowly into 100 g of the dispersion from the Comparative Example. The dispersion coagulated.
EXAMPLE 3
Preparation of a paint
60 g of water, 2 g of a corrosion inhibitor (1:1 benzoic acid/sodium nitrite), 2 g of sodium polyacrylate, 2 g of a preservative (isothiazolinone), 100 g of 50% strength by weight styrene/acrylate dispersion, 10 g of mineral spirit (boiling point 180.degree.-210.degree. C.) and 3 g of a silicone-based antifoam were premixed in a dissolver. 109 g of Tremin 283/400 AST (filler based on quartz), 83 g of iron oxide red 130M and 100 g of zinc molybdenum phosphate were added, and the mixture was milled in a ball mill. 485 g of 50% strength by weight styrene/acrylate dispersion and 3 g of antifoam (based on mineral oil) were then added.
Claims
We claim:
1. An aqueous secondary dispersion containing phosphate groups and intended for use in paints, obtained by 1) copolymerization of components consisting essentially of (A) 25-98% by weight of acrylates, methacrylates or mixtures thereof (B) 1-10% by weight of acrylic acid, methacrylic acid or mixtures thereof, (C) 1-8% by weight of a compound of the formula ##STR3## where R.sup.1 and R.sup.2 independently are hydrogen or a C.sub.1 -C.sub.8 -hydrocarbon radical and Z is a straight-chain or branched C.sub.1 -C.sub.8 -alkylene, and (D) 0-68% by weight of a vinylaromatic compound, in an organic solvent, 2) neutralization of the copolymer solution and 3) dilution with water.
2. A secondary dispersion as defined in claim 1, obtained using a component (C) where R.sup.1 is CH.sub.3 and R.sup.2 is hydrogen.
3. A secondary dispersion as claimed in claim 1, obtained using styrene as component (D).
4. A secondary dispersion as claimed in claim 1, obtained by neutralization of the copolymer solution with aqueous ammonia solution.
5. A paint containing a secondary dispersion as defined in claim 1.
6. A paint containing a secondary dispersion as defined in claim 1 and active pigments with or without further assistants.
7. A coating material for coating substrates, containing a paint as defined in claim 6.
8. A coating material for coating metals, containing a paint as defined in claim 6.
9. A secondary dispersion as defined in claim 1, wherein the organic solvent is removed by distillation.
10. An aqueous secondary dispersion as defined in claim 1, where the amount of component A in the copolymer is 25-60% by weight and the amount of component D in the copolymer 20-60% by weight.
11. A process for preparing an aqueous secondary dispersion containing phosphate groups and intended for use in paints which comprises (1) copolymerizing components consisting essentially of (A) 25-98% by weight of acrylates, methacrylates or mixtures thereof (B) 1-10% by weight of acrylic acid, methacrylic acid or mixtures thereof, (C) 1-8% by weight of a compound of the formula ##STR4## where R.sup.1 and R.sup.2 independently are hydrogen or a C.sub.1 -C.sub.8 -hydrocarbon radical and Z is a straight-chain or branched C.sub.1 -C.sub.8 -alkylene, and (D) 0-68% by weight of a vinylaromatic compound, in an organic solvent, (2) neutralizing the copolymer solution and (3) diluting the neutralized copolymer solution with water.
Patent Citations (2)
| Patent | Date | Inventor | Cited By |
|---|---|---|---|
| US4487859 | 1984-12-01 | Martino | |
| EPX37150 | 1981-10-01 |