Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Polymers from only ethylenic monomers or processes of...
Patent
1991-09-24
1993-07-06
Schofer, Joseph L.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Polymers from only ethylenic monomers or processes of...
526312, 5263285, C08F 218, C08F21206, C08F22018
Patent
active
052255050
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to novel acrylic copolymers which can be used as coatings, in particular as soil-repellent coatings for the building industry.
It is customary in the building industry to use coatings for the protection of tiles against soiling, these coatings most frequently being present as resins in an organic solvent medium. It is likewise known to use resins in organic solvent medium as anti-graffiti coatings, in order to prevent deteriorations of buildings, in particular tiles and ceramic wall coatings which decorate the majority of public and private buildings. In both cases, the use of an organic solvent makes it possible, provided suitable resins are chosen, to achieve the desired goal, i.e. the protection of tiles and ceramics against soiling of any nature (blood, greases, colorants such as eosine) and especially against inks of various compositions used in felt-tip pens and indelible marker pens. However, the use of an organic solvent has obvious drawbacks with respect to odour and more generally with respect to environmental and pollution problems. In particular, the manufacture of a soil-repellent coating in an organic solvent requires recovery, purification and recycling steps of the solvent, in order to avoid its discharge into nature.
Accordingly, a constant problem with research in the area of soil-repellent coatings consists in preparing formulations in which the proportion of organic solvent used is reduced or, if possible, the use of organic solvents is even avoided, while maintaining the soil-repellent properties of the known products in the organic solvent medium at the same level.
SUMMARY OF THE INVENTION
With a view to solving the problem formulated in this manner, the present invention first relates to new acrylic copolymers comprising, per 100 parts by weight: alkyl group has 1 to 10 carbon atoms or aryl acrylate or methacrylate whose aryl group has 6 to 10 carbon atoms, ##STR2## in which n is an integer between 1 and 20 and R.sub.1 is an alkyl radical having 1 to 10 carbon atoms, and about 0 to 65 parts of at least one fluorinated alkyl (meth)acrylate and up to 5 parts of acrylic acid.
Fluorinated alkyl (meth)acrylate according to the present invention is understood to mean a compound of the formula: ##STR3## where: R.sub.1 is a methyl radical, CH.sub.2 -CH.sub.3 and CFH;
Examples of such compounds are in particular 2,2,2-trifluoroethyl acrylate and methacrylate.
The radical R.sub.1 of the aminated methacrylate of the formula (II) can be chosen in particular from methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, tert.-butyl, isoamyl, n-hexyl, 2-ethylhexyl, n-octyl, 3,5,5-trimethylhexyl radicals, and the like. Of these, the radicals which are sterically strongly hindered, in particular the tert.-butyl radical, are preferred.
The alkyl radical of the alkyl acrylate or methacrylate can be chosen from the same radicals already mentioned as the radical R.sub.1. The aryl radical of the aryl acrylate or methacrylate can be chosen in particular from phenyl, benzyl, tolyl and xylyl radicals.
The molecular weight of the copolymers according to the invention is in general between 10.sup.5 and 3.times.10.sup.6.
The copolymers according to the invention can be present in aqueous dispersion, it being possible for the dry extract (solids content) of said dispersion to reach up to about 70% by weight. The particle size of the aqueous dispersion (determined by turbidimetry or scattering of light) can be between about 0.05 and 0.5 .mu.m. The Brookfield viscosity at 20.degree. C. of an aqueous copolymer dispersion according to the invention can in general be between 30 and 2000 mPa.s.
The copolymers according to the invention can furthermore contain, per 100 parts by weight of the monomers already mentioned, up to about 5 parts of acrylic acid and/or up to about 3 parts of at least one crosslinking monomer, preferably chosen from N-hydroxyalkylacrylamides and -methacrylamides, acrylamide, methacrylamide, divinylbenzene and oligoacrylates and oligome
REFERENCES:
patent: 3099636 (1963-07-01), Skiles
patent: 3384627 (1968-03-01), Anello et al.
patent: 4147851 (1979-04-01), Raynolds
Atochem
Sarofim N.
Schofer Joseph L.
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