DE1043553B - Sprayable, non-thread-forming paint based on polyacrylic acid methyl esters - Google Patents

Description

GERMAN

The invention relates to a sprayable, non-thread-forming paint based on poryacrylic acid methyl esters, optionally mixed with copolymers of vinyl resins, containing plasticizers and pigments.

Polymethacrylic acid methyl esters are well-known paint raw materials that can be expanded with molecular weights Area and the most diverse solvents are processed into paints and where you have the most diverse Has used viscosity grades and solids contents. Because the consistency of spray paints has a certain degree must not exceed, these lacquers were thinned more, which, however, suffered from the filling and covering power. If the paints could be sprayed without thread formation, the layers obtained were so thin that numerous Layers had to be sprayed on in order to achieve a sufficiently strong film. But it turned out that these varnishes had insufficient flow, so that wrinkling and cracking occurred. The setting on a sufficient Spray viscosity or the addition of plasticizers and pigments to the polyacrylate paints sufficed for the practical ones Requirements do not. This could also be achieved with solvent mixtures of aromatics and ketones Defects cannot be remedied.

The surprising observation has now been made that a sprayable, non-thread-forming paint is obtained based on polyacrylic acid methyl esters, optionally mixed with copolymers Vinyl resins with a. Content of plasticizers and pigments is obtained if the following conditions are met will:

a) The polymethacrylic acid methyl ester must have a relative viscosity of 1.117 to 1.196, where Sprayable, non-thread-forming lacquer based on polyacrylic acid methyl esters

Applicant:

E. I. du Pont de Nemours and Company, Wilmington, Del. (V. St. A.)

Representative: Dr.-Ing. G. Knoth, patent attorney, Hamburg-Wellingsbüttel, Up de Worth 24

Claimed priority: V. St. v. America 6 January 1954

Laverne William Crissey, Penfield, Pa.,

and John Herbert Lowell, Brookline, Pa. (V. St. A.),

have been named as inventors

(A) Outflow time of the polymer solution (B) Outflow time of the solvent used

is. The outflow times are according to ASTM-D-445-46 T (Zerbe, "Mineralöl", Berlin 1952, p. 52, footnote 2) Method B determined, with a solution of 0.25 g instead of the oil (A) provided therein of the methyl polymethacrylate to be investigated in 50 ecm of ethylene dichloride and (B) a sample this ethylene dichloride is used. The determinations are made at 25 ° C in a modified Oswald viscometer, group 50, performed;

the methyl polymethacrylate must be based on the total weight related to polymer and solvent, in the solution in an amount of at least 10% and a maximum amount according to a function based on the following values:

Yl Applicable maximum amount ijr of polyanera in percent by weight 1.117 19.6 1.122 19.0 1.153 16.5 1.176 14.1 1.190 12.9 1.196 12.4

wherein the solvent consists of fractions which have the following boiling limits and relative solvency power :

Factions

of each
20 percent by volume

1st parliamentary group ...

2nd parliamentary group ...

3rd parliamentary group ...

4th parliamentary group ...

5th parliamentary group ...

Boiling limits

58-121 ° C from 64.5 to 122 ⁰ C 67.5 to 142 ° C from 73 to 159 ⁰ C 90-172 ° C

Relative dissolving power according to

0.74 to 2.18 0.74 to 2.16 0.71 to 2.10 0.10 to 2.08 0.02 to 2.02

The composition of the solvent mixture is of considerable importance, although it depends less on it.

Sm 67 &'339

What kind of solvents these are, than their boiling limits and their dissolving power.

The solvent mixture must once have sufficient solvent power, so that a thin-bodied paint is achieved, which can be sprayed into the finest mist. The solvent mixture must have low-boiling components which allow perfect spraying to a fine mist, but after leaving the spray nozzle on evaporate on the way to the surface to be treated. The paint must therefore be very thin in the spray nozzle be. As a result of the evaporation of the volatile components takes place on the way to the to be treated Surface an accumulation of the mist particles in solids instead, so that a paint film is applied to the surface which is so viscous that it no longer flows or collapses, but has a good flow, the sprayed particles converge and a smooth coating is achieved. Cores from the paint are also allowed solid particles are deposited, so that cloud formation is avoided.

By adding small amounts of solvent with boiling points below 58 or above 172 ° C, the specified Boiling limits changed slightly, which usually has something to do with shelf life, processability or affects the film properties.

The solvent mixtures according to the invention are characterized by certain boiling limits of five fractions each marked with the same volume. If the amount of solvent is 500 ecm, each of the five fractions has one Volume of 100 ecm.

Table 1
Mixed solvents

Components

acetone

toluene

Solvent naphtha

Amyl alcohol

Glycol Monoacetate ...

Methyl ethyl ketone

White spirit

High boiling

Mineral spirits

Xylene

solvent

No. 1 No. 2 No. 3

No. 4 No. 5

Parts by weight

40.0

30.0

20.0

3.3

6.7

50.0

15.0
35.0

40.0
15.0

3.3
6.7

15.0
20.0

28.6
21.4
33.3
5.5
11.2

50.0

35

40

-

50.0

5o

Under the name »Polymethacrylic acid methyl ester« · are, in the context of the present invention, polymers of pure methyl methacrylate, mixed polymers from polymethacrylic acid methyl ester and

other, a terminal vinylidene group CH ₂ = C

containing substances to be understood with the polymethacrylic acid methyl ester Able to form copolymers and contain at least about 95 percent by weight of polymethacrylic acid methyl ester, as well as polymer mixtures, that is, mixtures of polymers and / or copolymers.

In Fig. 1 five curves 1 to 5 are shown, which depend on the maximum permissible content of polymer of the various relative viscosities between 1.117 to 1.196 using those listed in Table 1 Show solvent mixtures. Curve 1 corresponds to solvent no. 1, curve 2 to that Solvent # 2, curve 3 for solvent # 3, curve 4 for solvent # 4 and curve 5 for solvent # 4 Solvent No. 5,

Fig. 2 illustrates the boiling limits of the five solvent fractions in five curves 1 to 5 with the points F, G, H, I, J, K, L ₁ M.

From Fig. 1 it can be seen that when using the solvent mixture No. 1 (curve 1), the relative viscosity of the polymethacrylic acid methyl ester can vary from 1.117 to 1.196 and its amount from 18.2 to 11.5%. For solvent no. 5 (curve 5) the relative viscosity, like all other curves, also extends over a range from 1.117 to 1.196 and the concentration of the polymer is 19.6 to 12.4%. The relative viscosities in points A, B, C, D, E correspond to the concentrations according to the invention of 19.6, 19.0, 16.5, 14.1, 12.9 and 12.4%. If the paint contains less than 10% polymethacrylic acid methyl ester, it can be sprayed without any problems. The paint film is very thin and less than 13 microns. If several layers are sprayed on in order to achieve the necessary film thickness, the process is not only uneconomical because of the greater expenditure of time and effort as well as the considerable consumption of solvent, but the paint films are also uneven. They shrink and show fog.

If a polymer content above 19.6% is used, thread formation already occurs, while further Increasing the polymer concentration results in spider web effects, the paint films are wrinkled and cause cracks to form even if the spraying is done very carefully.

The polymethacrylic acid methyl ester lacquers are pigmented if a polymer with a relative viscosity of less than 1.112 is used, it becomes brittle and cracked Obtain films that are not resistant to shock and bending.

If you use a polymer with a relative viscosity above about 1.196, you can only get a thread-free one Achieve splashing when the polymer concentration is below 10%, so that the above Disadvantages of the diluted paint solutions occur. However, if the polymer content is increased to over 10%, e.g. B. on 10.5 or even 12%, thread formation already occurs.

The boiling limits and the solvency, the solvency of the solvents for the polymethacrylic acid methyl ester according to the invention are determined by boiling analysis, e.g. B. according to the regulations of ASTM-D-268-46 (Zerbe, loc. Cit. OS 276), determined by determining the boiling limits of the individual successive fractions and subsequently determining for each fraction how much of the methyl polymethacrylate can be dissolved therein. The solubility tests are carried out at room temperature, the solvent fraction to be tested being added to a comparative solution of 25 percent by weight of methyl polymethacrylate in chemically pure toluene so that the mixture contains 1 percent by weight of the polymer, and the two liquids are mixed thoroughly. 25 ecm of this mixture are then placed in a 125 ecm Erlenmeyer flask and titrated with chemically pure heptane to a point at which the cloudiness is so strong that a 3.5 mm high print according to ASTM-D-1132-50 T is illegible will. The amount of heptane consumed up to this cloud point (Zerbe, loc. Cit. OS 59) in ecm is considered to be the "relative dissolving power " of the fraction. If a large amount of heptane is used for this purpose, i.e. a large solvent power is found, this fraction is to be regarded as a good solvent for the polymethacrylic acid methyl ester and vice versa.

It was found that the dissolving power depends on the relative viscosity of the

turned polymethacrylic acid methyl ester depends. The fluctuations are turned off when you do that Comparing the dissolving power of the solvent fraction in question with the dissolving power of pure toluene, i.e. the value

L ₇ , =

Solvency of the fraction
Solvent power of pure toluene

determined for each solvent fraction. This ratio L _r is referred to as the "relative solvency".

The dissolving power of chemically pure toluene is determined by adding the comparison solution of the polymethacrylic acid methyl ester for toluene determined in the same way as above for the solvent fractions to be investigated is described.

The solvent mixture can also be divided into ten fractions of the same amount of space. The boiling limits to be observed, the dissolving power in heptane and the relative dissolving power L _r of solvents no. 1 to no. 5 according to table 1 are listed in table 2.

Table 2

Faction of ever 60 number 1 No. 2 until 63.5 13.8 13.4 solvent No. 3 9.3 No. 4 No. 5 10 percent by volume 65.5 until 64.5 13.7 13.4 9.3 68 up to 65.5 until 66 13.6 13.4 to 63 9.3 62 to 78 116 to 120 Parliamentary group 1 72 to 68 Boiling limits until 67.5 13.6 13.3 in ⁰ C up to 65 8.8 78 to 85 120 to 121 Group 2 82 to 72 62 until 70 12.6 13.3 to 67 7.2 85 to 92 121 to 122 Parliamentary group 3 116 to 82 63.5 until 73 10.5 13.2 to 71 2.5 92 to 112 122 Group 4 126 to 116 64.5 until 79 8.8 13.2 to 89 0.4 112 to 132 122 to 124 Parliamentary group 5 132 to 126 66 until 90 7.7 13.0 to 117.5 0.9 132 to 142 124 to 126 Group 6 142 to 132 67.5 until 153 4.1 13.0 to 124 0.3 142 to 152 126 to 128 Group 7 159.5 to 142 70 until 157 0.9 12.4 to 135 ⁰ 152 to 159 128 to 132 Parliamentary group 8 to 159.5 73 Solving power in up to 150.5 L _T 159 to 164 132 to 139 Group 9 to 171 79 2.19 to 169 1.48 164 to 172 139 to 152 Group 10 90 2.17 ecm heptane 1.48 153 2.16 1.48 13.6 4.6 Parliamentary group 1 2.16 58 1.40 13.3 4.8 Group 2 2.00 63 1.14 13.3 4.7 Parliamentary group 3 1.67 65 0.40 12.9 4.6 Group 4 1.40 67 0.06 10.3 4.5 Parliamentary group 5 1.22 71 0.14 8.3 4.5 Group 6 0.65 89 0.05 6.3 4.0 Group 7 0.14 117.5 0 4.0 ■ 3.7 Parliamentary group 8 124 1.8 2.9 Group 9 135 ⁰ 2.5 Group 10 150.5 2.16 0.73 Parliamentary group 1 2.11 0.76 Group 2 2.11 0.75 Parliamentary group 3 2.05 0.73 Group 4 1.63 0.71 Parliamentary group 5 1.32 0.71 Group 6 1.00 0.63 Group 7 0.63 0.59 Parliamentary group 8 0.29 0.46 Group 9 Relative solvency 0 0.40 Group 10 2.13 2.13 2.13 2.11 2.11 2.09 2.09 2.06 2.06 1.97

In this determination, the comparison solution contained a polymethacrylic acid methyl ester of a relative Viscosity of 1.153 in chemically pure heptane.

The solubility in pure toluene was 6.3, that is, there was added 6.3 cc of pure heptane in the titration of a 25 l ° / _o solution of the ECM Polymethacrylsäuremethylesters in pure toluene consumed.

Under the expression "sprayable" and "non-thread-forming dtf it is understood that the paints in the usual processing of spray paints on the to be treated The surface does not form permanent threads or "cobwebs" and is smooth and uniform Film is achieved.

In this way, the values of the curves according to FIG. 1 were obtained by using the polymethacrylic acid methyl ester a relative viscosity of 1.117 to 1.196 in each of the five solvents in Table 1 and determined the maximum content of polymer at which thread formation no longer occurred.

The polymethacrylic acid methyl esters used according to the invention can be prepared by bead polymerization or emulsion polymerization or solution polymerization, with optionally up to 5% of another Substance can be present which forms copolymers with the methyl methacrylate. Your manufacture however, it is not claimed.

For the purpose of obtaining suitable methyl methacrylate polymers is placed in a closed one equipped with a thermometer, stirrer and reflux condenser Reaction vessel a corresponding amount of distilled methyl methacrylate monomers Brought catalyst and a solvent, heated for about 2 to 9 hours with constant stirring and then on Cooled to room temperature. According to this procedure

7 8

the polymers according to the invention can be obtained under the conditions listed in Table 3, in of which all parts are parts by weight.

Table 3
Methacrylic acid methyl ester polymers

Relative
Vis Methacryl
acid solvent acetone catalyst Tempe
rature yield
at poly- Around-
settling
Time, kosity methyl ester toluene 18th merem hours 1,112 40 42 18th 0.6 α, α'-azo-diisobutyronitrile 13O ⁰ C 72% 9 1.117 40 42 18th 0.362 benzoyl peroxide 90 ⁰ C 93% 9 1.141 40 42 42 0.28 α, α'-azo-diisobutyronitrile 130 ⁰ C 65% 9 1,145 50 8th 15th 0.3025 benzoyl peroxide 92 ° C 99% 6th 1.164 50 35 42 0.2813 benzoyl peroxide 92 ⁰ C 99% 6th 1.169 50 8th 16.5 0.27 benzoyl peroxide 89 ° C 96% 6th 1.173 45 38.5 10.0 0.2417 benzoyl peroxide 89 ° C 98% 8th 1.173 66.67 23.33 11.4 0.4 benzoyl peroxide 100 ⁰ C 98% 2 1.192 62 26.6 10.0 0.341 benzoyl peroxide 90 ° C 95% 3 1.207 66.67 23.33 0.3333 benzoyl peroxide 100 ⁰ C 96% 2

Suitable solvents are all mixtures of aliphatic, alicyclic or aromatic origin, such as Hydrocarbons and their functional derivatives and substitution products, e.g. B. alcohols, ketones, Esters, ethers, halogen derivatives that meet the requirements of the invention in terms of boiling limits and des Meet solvency.

Example 1 to

The quantities given are by weight. By grinding in a ball mill for 2 days the following two basic mixes were made:

Polymethacrylic acid methyl ester, relative viscosity 1.152

Titanium dioxide

toluene

acetone

Basic mix

for example

1 and 5

4.17 teüe

8.33 teüe

12.50 parts

25.00 parts

Basic mixture for example 2, 3 and 4

4.17 parts 8.33 parts

25.00 tea

The homogeneous dispersions obtained were then added to those required to obtain concentrated lacquer colors Made additives, whereupon the lacquer paints showed the following composition:

Table 4
Concentrated base paint mixtures

No., No. 2

sample
No. 3

No. 4

No. 5

Polymethacrylic acid methyl ester , t] _{T = 1.153}

Dibutyl phthalate plasticizers

Titanium dioxide

Solvent mixture no. 1

Solvent mixture no.2

Solvent mixture no.3

Solvent mixture no.4

Solvent mixture no.5

With the paint obtained in this way, three layers were sprayed onto metal sheets and determined up to the maximum thickness that the film could be applied to without wrinkling or fogging occurred. There was a break of 1 to 4 minutes between the spraying of the individual layers.

Paint no.3 was air-dried at room temperature, while those with paint no.1,

29.77 11.90 8.33 50.0 29.77

11.90

8.33

50.0

29.77

11.90

8.33

50.0

29.77

11.90

8.33

50.0

29.77

11.90

8.33

50.0

No. 2, No. 4 and No. 5 sprayed trays were dried for 2 to 3 minutes at 93 ° C. All coatings were smooth, uniform and free from wrinkles and veils.

The amount of solvent added, the solids content, the polymer content and the thickness of the three-layer film are for each of these paint colors in Table 5 reproduced and the values of which are characteristic of the coating compositions according to the invention.

ίο

TabeUe 5 Ready-to-use paint mix

Concentrated base coat color after number 1 No. 2 sample
No. 3 I No. 4 125
22.25
14.5
72 No. 5 Solvent additive to 100 parts of primer paint ...
Total solvent content 140
20.85
13.5
80 149
20.1
13.0
150 135
21.25
13.8
115 115
23.25
15.3
72 Content of polymethacrylic acid methyl ester, on the
Total content of methyl polymethacrylate
and solvent related
Film thickness of the three-layer coating in microns ...

It has been found that the incorporation of Pig-15 base paint

ments and plasticizers in the polymethacrylic acid methyl ester according to the invention, relative Paint mixture the amount of polymer that can be sprayed without thread formation must be reduced. The polymer content is therefore a little lower than in these cases

Parts by weight

for pure polymer- solvent mixtures the curve ABCDE of FIG. 1 can be seen.

Example 6

The following base coat was produced by grinding the following components in a ball mill for 24 hours:

Base coat color parts by weight

Polymethacrylic acid methyl ester, relative

Viscosity 1.122 10.0

Titanium dioxide 20.0

Toluene 25.0

Viscosity 1.190 10.0

Titanium dioxide 20.0

Toluene 35.0

55.0

40

45

185.0

It became a white, concentrated, methyl polymethacrylate enamel paint obtained according to the present invention, the solvent of which the composition of solvent no. 1 according to Table 1 had.

In order to obtain a sprayable, non-thread-forming paint, 83.1 parts of solvent no. 1 had to be added to 100 parts of the base mixture. The finished spray paint had a solids content of 27.3% and a polymethacrylic acid methyl ester content of 18.2%, based on the total weight of polymer and solvent, which is compatible with the curve ABCDE according to FIG.

With this diluted, sprayable paint, three layers were sprayed onto a test sheet, and that Sheet metal was dried in the oven in a manner similar to that of Examples 1, 2, 4 and 5. The film obtained had a thickness of 102 microns. It was perfectly smooth, uniform and free of wrinkles or dull spots.

Example 7

By grinding in a ball mill for 24 hours, a base coat color was made up of the following components manufactured:

65.0

175 parts of a solution of the following composition were added to this homogeneous dispersion:

Solvent parts by weight

Polymethacrylic acid methyl ester , r \ _r - 1.190 61.4

Dibutyl phthalate 28.6

Acetone 48.0

Toluene 1.0

Mineral spirits 24.0

Amyl alcohol 4.0

Ethylene glycol monoacetate 8.0

185 parts of the following solution were added to the homogeneous dispersion obtained:

Solvent parts by weight

Polymethacrylic acid methyl ester, relative

Viscosity 1.122 61.4

Dibutyl phthalate 28.6

Acetone 48.0

Toluene 11.0

Mineral spirits 24.0

Amyl alcohol 4.0

Ethylene glycol monoacetate 8.0

175.0

The mixture provided a white, concentrated methyl methacrylate base coat paint the solvent content of which had the composition according to solvent no. 1 of table 1.

100 parts of this basecoat paint had to be diluted with 427 parts of solvent no. 1 in order to achieve a perfect spray paint according to the present invention which could be sprayed without threading. This paint had a content of 18.0% solids and 11.5% polymer. Here, too, the polymer content is above the minimum value according to the invention of 10% and below the maximum value of 12.9% corresponding to the relative viscosity _r = 1.190 according to the curve ABCDE in FIG.

With this spray paint three layers were sprayed onto a test panel and the film as after Example 1, 2, 4 and 5 dried in the oven. The resulting paint film was 72 microns thick and had a smooth, uniform, wrinkle-free and haze-free surface.

Example 8

The following ingredients were ground to a homogeneous dispersion:

Base coat color parts by weight

Polymethacrylic acid methyl ester , r \ _r = 1.169 28.70

Benzyl butyl phthalate 12.90

Titanium dioxide 8.10

Phthalocyanine Blue 0.15

Carbon black 0.15

Toluene 35.00

Acetone 15.00

100.00

309 678/39?

This base coat color was made with the following solvent mixture diluted:

Solvent parts by weight

Toluene 23.3

Acetone 43.1

Amyl alcohol 4.4

Ethylene glycol acetate 9.0

Mineral spirits 20.2

100.0

With the aid of the spray test described, it was found that 144 parts per 100 parts of the base coat of the thinner were necessary to achieve a perfectly sprayable paint color.

The solvent content of the spray paint had roughly the following composition:

Parts by weight

Toluene 35.3

Acetone 39.7

Amyl alcohol 3.3

Ethylene glycol acetate 6.7

Mineral spirits 15.0

100.00

The boiling limits and the dissolving power of this solvent mixture correspond to those of Table 2.

The diluted, sprayable paint had a solids content of 20.5% and a polymer content of 12.9%, again based on the total weight of polymer and solvent. Here, too, the polymer content is above the minimum value _{according to the invention of 10 ° / 0} and below the maximum value to be taken from the curve ABCDE in FIG. 1 for a relative viscosity of 1.169.

Using the ready-to-use lacquer paint, three layers were sprayed onto a test panel and afterwards Example 1, 2, 4 and 5 dried. The resulting film was 60 microns thick. It was smooth, uniform and free of wrinkles, veils or dull spots.

The pure polymers of methyl methacrylate are to be preferred. However, these can be used in whole or in part by means of copolymers containing at least about 95% methyl methacrylate. For example, the methyl polymethacrylate listed in the examples can be completely or partially replaced by a copolymer of about 98 °; ₀ methyl methacrylate and 2% methacrylic acid can be replaced with essentially the same result. Other copolymers of polymethacrylic acid methyl ester with alkyl esters of acrylic and methacrylic acid with a short alkyl radical with 1 to 4 carbon atoms and vinyl acetate, acrylonitrile and styrene are also suitable.

Other film-forming substances compatible with these polymers can also be added to the paints with the additives mentioned in amounts of up to about 10 ⁰ J ₀ , based on the total weight of the film-forming components of the mixture, such as cellulose nitrate, other cellulose esters, alkyd resins and polymers short-chain alkyl esters of acrylic or methacrylic acid, it being useful to mix in these additional film formers in the form of their solutions.

The solvent mixtures listed in the examples can also be replaced by numerous other suitable ones Solvents are replaced if they are only with regard to their boiling limits and solubility properties meet the requirements of the invention.

Many of those for methyl polymethacrylate can be used as plasticizers suitable plasticizers are used, such as benzyl butyl phthalate, dibutyl phthalate, Triphenyl phosphate, 2-ethylhexylbenzyl phthalate and dicyclohexyl phthalate. Also to be mentioned are diallyl phthalate, dibenzyl phthalate, butyl cyclohexyl phthalate, Mixtures of benzoic and fatty acid esters of pentaerythritol, polypropylene adipate dibenzoate, Diethylene glycol dibenzoate, tetrabutyl thiodisuccinate, butyl phthalyl butyl glycolate, acetyl tributyl citrate, dibenzyl sebacate, Tricresyl phosphate, toluene ethyl sulfonamide, 2-ethylhexyl ester of hexamethylene diphthalate and dimethyl cyclohexyl phthalate. The plasticizers are generally used in amounts of about 10 to 50%

¹ ^ Polymethacrylic acid methyl ester calculated, applied.

Except for the pigments mentioned in the examples

other known pigments can be added, such as Prussian blue and other blue or green iron cyanide salts, Metal oxides, hydroxides, sulfates, sili-

2Q cate and chromates; organic brown pigments, Aluminum flock, bronze powder, pearl essence and a wide variety of fillers and extenders, such as talc, Barytes, clays and diatomaceous earth.

The amount of pigment added does not play an essential role. It only needs to be big enough to be one sufficient opacity is achieved. The pigment addition can be between about 2% for light, highly opaque Pigments, such as carbon black or aluminum, and up to 100% for heavy, poorly opaque pigments, such as lead chromate, calculated on the weight of the organic film former.

The oven drying mentioned in the examples is mainly used to shorten the drying process. The coatings can also be air-dried according to Example 3 under normal temperature and humidity conditions. Air drying requires 53,150 usually 4 to 24 hours to a degree of dryness according to DIN, while the drying time in the oven drying at 65 to 95 ° C for 30 to 60 minutes and at 120 to 150 ⁰ C to about 15 is shortened to 20 minutes.

The paints according to the present invention are well suited for the application of decorative or protective Coatings on a wide variety of materials, such as wood, metal, ceramic materials and the like.

Claims (5)

Claim: Sprayable, non-thread-forming paint based on polyacrylic acid methyl esters, optionally mixed with copolymers of vinyl resins, a content of plasticizers and pigments, consisting of a solution of a polymethacrylic acid methyl ester with a relative viscosity of 1.117 to 1.196 in a solvent in amounts of at least 10% Total weight of polymer and solvent based, and a maximum amount corresponding to a function based on the following values: Y) Maximum amount to be used1 of the polymer in percent by weight 1,11719,61,12219,01,15316,51,17614,11,19012,91,19612 , 4 13 where the solvent consists of fractions that have the following boiling limits and relative solvent power: fractions of 20 percent by volume each 1st parliamentary group ... 2nd parliamentary group ... 3rd parliamentary group ... 4th parliamentary group ... 5th parliamentary group ... Boiling limits 58-121 ⁰ C 64.5 to 122 ° C from 67.5 to 142 ° C 73-159 ° C 90-172 ° C Relative dissolving power L _r 0.74 to 2.18 0.74 to 2.16 0.71 to 2.10 0.10 to 2.08 0.02 to 2.02 Considered publications: U.S. Patent No. 2,650,909; Thinius, "Hochpolymere", 1952, pp. 212, 213; Scheiber, "Chemistry and Technology of Artificial Resins", 1943, p. 241; Wagner-Sarx, "Lackkunstharze", 1950, pp. 178 to 180; Fischer, "Paintand Varnish Technology," 1948, p. 222; Brochures from Röhm und Haas GmbH., Darmstadt, regarding vPlexisol M430 "and" PlexigumM265 ". 1 sheet of drawings