Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-06-13
1999-04-27
Dawson, Robert
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
523407, 523412, 525530, C08K 320, C08L 6302
Patent
active
058980458
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The invention relates to aqueous polymer dispersions, to aqueous coating materials based on these polymer dispersions, and to a process for the finishing of motor-vehicle bodies.
BACKGROUND AND SUMMARY OF THE INVENTION
Aqueous polymer dispersions and aqueous coating materials based on aqueous polymer dispersions are known. EP-A-469,646, for example, describes aqueous polymer dispersions of hybrid polymers, which are used for the production of aqueous coating materials. The hybrid polymers are prepared by polymerizing ethylenically unsaturated monomers in the presence of an epoxide-containing reaction product of n mol of a bisepoxide compound and n-1 mol of a dicarboxylic acid, which product has itself been reacted with unsaturated fatty acids. Following neutralization of the acid groups contained in the polymer, the hybrid polymer is dispersible in water. From the aqueous polymer dispersions prepared in this way it is possible to product aqueous coating materials which, disadvantageously, give coating films which have a tendency to yellow, especially when relatively long baking times and/or relatively high baking temperatures are employed.
The object of the present invention is to provide aqueous polymer dispersions from which it is possible to produce aqueous coating materials which can be used to produce coating films in which the above-described disadvantages are reduced or absent and which additionally have good surface properties, in particular a high acid resistance and scratch resistance.
This object is surprisingly achieved by the provision of aqueous polymer dispersions which can be prepared in that which contains acid groups, or of a mixture of such monomers, and which is free from acid groups, or of a mixture of such monomers, being 100% by weight, are subjected to free-radical polymerization in the presence of groups, or a mixture of such compounds, and atoms, or a mixture of such monocarboxylic acids, and (b1) and saturated fatty alcohol, or a mixture of such monoesters, (b1) and components (b21) and (b3) or a mixture of components (b22) and (b3). neutralization of at least 20 percent of the acid groups contained in the polymerization product, into an aqueous polymer dispersion, components (b1), (b2), (b3) and (b4) being reacted with one another in proportions such that components (B1), (B2) and (B3) contain on average per molecule not more than 0.25 epoxide groups and at least 0.4 ethylenically unsaturated groups which derive from component (b21) and/or component (b3) .
DETAILED DESCRIPTION
As component (a1) it is possible in principle to employ any ethylenically unsaturated monomer which contains acid groups, or a mixture of such monomers. Examples of ethylenically unsaturated monomers which contain acid groups are acrylic acid, methacrylic acid, maleic acid and fumaric acid. As component (a1) it is preferred to employ methacrylic acid or acrylic acid or a mixture of methacrylic acid and acrylic acid.
As component (a2) it is possible to employ any ethylenically unsaturated monomer which is free from acid groups, or a mixture of such monomers. Examples of ethylenically unsaturated monomers which are free from acid groups are: (cyclo)alkyl (meth)acrylates having 1-12 carbon atoms in the (cyclo)alkyl radical, for example methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, butyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, octyl (meth)acrylate, isobornyl (meth)acrylate, dodecyl (meth)acrylate and cyclohexyl (meth)acrylate; (cyclo)alkyl esters of maleic acid, fumaric acid acid and itaconic acid, for example dimethyl maleate, diethyl maleate, diethyl fumarate, dipropyl maleate, dibutyl maleate and dibutyl fumarate; (meth)acrylates containing ether groups, for example 2-methoxyethyl (meth)acrylate, 2-ethoxyethyl (meth)acrylate and 3-methoxypropyl (meth)acrylate; hydroxyalkyl (meth)-acrylates, for example 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, 4-hydroxybutyl (meth)-acrylate, 6-hydroxyhexyl (meth)acrylate,
REFERENCES:
patent: 4294737 (1981-10-01), Sekmakas et al.
patent: 4564648 (1986-01-01), Huybrechts et al.
Patent Abstracts of Japan, vol. 8, No. 34 (C-210), abstract of JP, A, 58-198513, Nov. 18, 1983.
Chmielewski Dietmar
Schwarte Stephan
Wigger Georg
Aylward D.
BASF Coatings AG
Dawson Robert
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