Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – At least one aryl ring which is part of a fused or bridged...
Reexamination Certificate
2000-03-06
2003-03-11
Cain, Edward J. (Department: 1714)
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
At least one aryl ring which is part of a fused or bridged...
C524S253000, C523S216000
Reexamination Certificate
active
06531538
ABSTRACT:
BACKGROUND OF THE INVENTION
1) Field of the Invention
The invention relates to fast-drying rendering and coating compositions, and also to a concentrate for preparing compositions of this type.
2) Background Art
Conventional coating compositions dry very slowly, particularly in the fall and in winter, and this may significantly delay subsequent operations. Solutions to this problem described in the prior art use coating compositions which rapidly form a surface film allowing the next layer of render to be applied at an early stage.
EP-A 866102 describes fast-drying coating compositions based on an aqueous synthetic-polymer dispersion which also has a salt content to lower the freezing point and chemical crosslinking agents, if desired in combination with UV crosslinking agents.
EP-A 200249 describes a method for preparing fast-drying road-marking paints, in which an aqueous synthetic-polymer emulsion paint with a high filler content is applied to the road and salt is then sprinkled on.
European Patent Applications EP-A 811663, EP-A 798350 and EP-A 409459 disclose fast-drying paints for road marking which comprise an aqueous synthetic-polymer dispersion and amine-functional copolymers.
The prior-art solutions have the disadvantage that either complicated mixes or highly specific agents have to be used.
The object was therefore to develop a coating composition which dries rapidly and on which, therefore, further work can be carried out at an early stage, using a mix which is as user-friendly and uncomplicated as possible.
SUMMARY OF THE INVENTION
The invention provides a fast-drying rendering and coating composition comprising a binder in the form of an aqueous polymer dispersion or of a water-redispersible polymer powder, and also an organic precipitant, if desired, in combination with an inorganic precipitant.
The binders used may comprise any commonly used aqueous polymer dispersions or water-redispersible polymer powders of any conventional resin type. Redispersible means that the agglomerates obtained after drying break down into the primary particles again when added to water, and these are then dispersed in the water. Suitable polymers are those based on one or more monomers selected from the group including vinyl esters of unbranched or branched alkylcarboxylic acids having from 1 to 15 carbon atoms, methacrylates and acrylates of alcohols having from 1 to 10 carbon atoms, vinyl aromatics, olefins, dienes and vinyl halides. It is also possible to use mixtures of the polymers mentioned.
Preferred vinyl esters are vinyl acetate, vinyl propionate, vinyl butyrate, vinyl 2-ethylhexanoate, vinyl laurate, 1-methylvinyl acetate, vinyl pivalate and vinyl esters of alpha-branched monocarboxylic acids having from 5 to 11 carbon atoms, such as VeoVa5®, VeoVa9®, VeoVa10® or VeoVa11®. Preferred methacrylates or acrylates are methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, propyl acrylate, propyl methacrylate, n-butyl acrylate, n-butyl methacrylate and 2-ethylhexyl acrylate. Preferred vinyl aromatics are styrene, methylstyrene and vinyltoluene. The preferred vinyl halide is vinyl chloride. The preferred olefins are ethylene and propylene, and the preferred dienes are 1,3-butadiene and isoprene.
Preference is given to polymers which also contain, based on the total weight of the polymer, from 0.1 to 8% by weight of one or more ethylenically unsaturated, carboxyl-containing monomers. Suitable ethylenically unsaturated carboxyl-containing monomers are ethylenically unsaturated mono- or dicarboxylic acids, such as acrylic acid, methacrylic acid, maleic acid, fumaric acid and itaconic acid. The content of carboxyl-containing comonomer units is preferably from 0.3 to 4% by weight, based on the total weight of the copolymer.
The polymers may, if desired, also contain from 0.01 to 10.0% by weight, based on the total weight of the copolymer, of auxiliary monomers selected from the group consisting of the ethylenically unsaturated carboxamides, preferably acrylamide, selected from the group consisting of the ethylenically unsaturated sulfonic acids and salts of these, preferably vinylsulfonic acid, selected from the group consisting of comonomers with more than one ethylenic unsaturation, for example divinyl adipate, diallyl maleate, allyl methacrylate or triallyl cyanurate and/or selected from the group consisting of the N-methylol(meth)acrylamides and ethers of these, such as isobutoxy or n-butoxy ethers.
Particularly preferred polymers are the following. The data are given in percent by weight, where appropriate, with the proportion of carboxyl-containing comonomer units, and give 100% by weight in total: from the vinyl ester polymer group, vinyl acetate polymers, vinyl acetate-ethylene copolymers with an ethylene content of from 1 to 60% by weight; vinyl ester-ethylene-vinyl chloride copolymers with an ethylene content of from 1 to 40% by weight and a vinyl chloride content of from 20 to 90% by weight; vinyl acetate copolymers with from 1 to 50% by weight of one or more copolymerizable vinyl esters, such as vinyl laurate, vinyl pivalate, vinyl esters of an alpha-branched carboxylic acid, in particular vinyl versatates (VeoVa9®, VeoVa10®, VeoVa11®), which where appropriate, also contain from 1 to 40% by weight of ethylene; vinyl acetate-acrylate copolymers with from 1 to 60% by weight of acrylate, in particular, n-butyl acrylate or 2-ethylhexyl acrylate, where appropriate, also containing from 1 to 40% by weight of ethylene. From the (meth)acrylate polymer group, polymers of n-butyl acrylate or 2-ethylhexyl acrylate; copolymers of methyl methacrylate with n-butyl acrylate and/or 2-ethylhexyl acrylate and copolymers of methyl methacrylate with 1,3-butadiene. From the vinyl chloride polymer group, in addition to the abovementioned vinyl ester-vinyl chloride-ethylene copolymers, vinyl chloride-ethylene copolymers and vinyl chloride-acrylate copolymers.
From the styrene polymer group, styrene-butadiene copolymers and styrene-acrylate copolymers, such as styrene-n-butyl acrylate or styrene-2-ethylhexyl acrylate with a styrene content of from 10 to 70% by weight in each case.
The polymers are prepared in a manner known per se, preferably by emulsion polymerization, for example as described in WO-A 94/20661, the relevant disclosure of which is incorporated into the present application by way of reference. It is also possible to use emulsifier-stabilized dispersions or protective-colloid-stabilized dispersions. Preference is given to polymers free from protective colloids. To prepare the powders, the resultant polymer dispersion is dried. The drying may take place by spray drying or freeze drying, or by coagulating the dispersion followed by fluidized-bed drying. Spray drying is preferred.
The binder is generally used in the form of an aqueous polymer dispersion or of a water-redispersible polymer powder, in amounts of from 5 to 15% by weight, preferably from 0.1 to 8% by weight, of polymer, based in each case on the coating composition.
Suitable organic precipitants are polymers selected from the group consisting of the polyethyleneimines and low-molecular-weight di-, tri- and tetramines with a molecular weight which is generally up to 200. Suitable low-molecular weight di-, tri- and tetramines are hexamethylenediamine, diaminotetramethylcyclohexane, 1,3-bis-aminomethylbenzene, diethylenetriamine, tri-ethylenetriamine and tetraethylenetetramine. Preference is given to polyethyleneimines, in particular those with an average molecular weight Mw of from 1·10
5
to 2·10
6
, particularly those with an average molecular weight Mw of from 7.5·10
5
to 1.2·10
6
, most preferably those with a Brookfield viscosity (20° C., 30% solids content) of from 150 to 350 mPas (Brookfield RVT, ISO 2225, 20° C., 20 rpm, spindle 5). The amount of organic precipitant used, based on the total weight of the coating composition, is generally from 0.01 to 1% by weight, preferably from 0.01 to 0.5% by weight, particularly preferably from 0.015 to 0.1% by weight.
If desired, the organic precipitant may
Ball Peter
Marquardt Klaus
Weitzel Hans-Peter
Zeh Harald
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