DE1223088B - Coating agents and varnishes - Google Patents

Description

Coating Agents and Varnishes The invention relates to coating agents and varnishes - in the following only coating agents are mentioned - based on oil-modified alkyd resins and epoxy compounds. According to the invention, these coating agents have the following components: a) a solvent-soluble, öhnodi-Merten alky resin half-ester with a residual acidity (acid number of about 80 to 120), b) an epoxy compound which has 6 to 26 carbon atoms in a fatty acid chain (epoxidized fat Oil) and an internal oxirane oxygen, and c) an inhibitor capable of salt formation which prevents a reaction between the acid group of the modified alkyd ester and the oxirane oxygen of the epoxy compound.

Such a coating agent can contain a tertiary amine as an inhibitor.

From L ee and N evi 11 e, "Epoxy Resins", 1957, p. 270, combinations of epoxy resins and various coating agents, such as alkyd resins, are known for paint purposes. These epoxy resins are condensation compounds of epichlorohydrin or dichlorohydrin and diphenylolpropane. As can be seen from the Shell company leaflet Epikote 1-1, September 1957, p. 2; 4 (last paragraph) to 5; 7 (last paragraph) to page 8, lines 1 to 3, these condensation products only have oxirane oxygen at the end. As can also be seen from this leaflet, epoxy resins have the property, which is important for practical purposes, that they can be cured by adding small amounts of certain amines, such as ethylene diamine, diethylene triamine, dipropylene triamine, etc., even at room temperature. In the coating agent according to the invention, however, an inhibitor capable of forming salts, such as a tertiary amine, prevents a reaction between the acid group of the modified alkyd resin and the oxirane oxygen of the epoxy compound. For this reason, the coating composition according to the invention can be stored.

The paints and stoving enamels customary in industry and for vehicles have the following properties, if they are to be regarded as useful: excellent color and good color fastness, good gloss, fast curing, quick hardness, low viscosity with a high solids content, extensive compatibility and good stability with other resinous materials and good pigmentation. A few known resins that meet these requirements are various soluble alkyd resin combinations that have been modified with either urea or melamine resins. In the case of the known coating agents, however, the elasticity in comparison to the hardness and also the color fastness and the resistance to solvents and alkalis still leave something to be desired.

The coating agent according to the invention which is soluble in organic solvents has low viscosity with high solids content, it is with pigments excellently tolerated and can be hardened in the heat; they become tough, permanent and elastic films with high hardness and good gloss that have excellent Resistant to water, alkalis and acidic substances and tough and are highly resistant to weathering and abrasion are resistant to cold shock, and are also excellent in resistance compared to the Show yellowing, are color fast if they Contain pigments, and also stuck to glass, metal and other resinous surfaces be liable.

To produce a coating agent according to the invention, a modified alkyd ester is first prepared from a monobasic acid, a polybasic acid or an anhydride and a polyol, which is then reacted with a further amount of a polybasic acid anhydride to form a modified alkyd resin half-ester with an acid number of about 80 to 120 to win. The preparation can be carried out in such a way that a fatty acid, a polyalcohol and z. B. phthalic anhydride at 182 to 238'C until an acid number of 45 to 90 is reached and then a further amount of a dibasic acid anhydride, such as phthalic anhydride, monochlorophthalic anhydride, tetrachlorophthalic anhydride or hexachloro-endo-methylentetrahydrophthalic acid is added and cooked at 182 to 193'C will. The resin obtained is cooled, e.g. B. to about 149'C, and with an aromatic solvent such as xylene or a mixture of xylene and butanol (95 parts xylene, 5 parts butanol), diluted -. if necessary, a further solvent is added in order to achieve a clear solution and to adjust the viscosity. After cooling to 43 ° C or less, the epoxy compound becomes and. optionally at the same time, before or after the inhibitor capable of salt formation is added.

If more than 25 to 30 parts by weight of the epoxy compound are added, a partial reaction between the alkyd resin half-ester formed and the epoxy compound is necessary in order to achieve optimal film properties, whereby care must be taken that the reaction between the oil-modified alkyd resin half-ester and the epoxy compound does not proceed to completion.

If about 25 % of the epoxy compound is added to the alkyd resin half-ester, tough, high-gloss films are obtained on curing at 121 to 149 ° C. for about 30 minutes. If, on the other hand, more than about 25 to 300/0 of the epoxy compound is added to the alkyd resin half-ester, a partial reaction is preferably achieved by forming a solvent-soluble interinolecular complex which still has an acidity which is neutralized before the reaction is complete. Softer films can be obtained without partial reaction by adding more than 30 l) /, of the epoxy compound. In order to obtain hard, tough, high gloss films, the epoxy compound preferably contains 8% or more internal oxirane oxygen.

Films formed from the coating composition according to the invention can be cured in 16 to 60 minutes or for a longer period of time at temperatures between 65 and 149 ° C. Longer curing times are required at lower temperatures. Curing for about 30 minutes at about 120 to 150.degree. C. enables films to be achieved which have optimal properties.

The inhibitor is added in an amount which is at least chemically equivalent to the acidity of the alkyd resin half-ester. The neutralization stabilizes the coating agent during storage. When a film is formed by dipping or spraying, the inhibitor evaporates or is driven off so that a reaction between the alkyd resin half-ester and the epoxy compound takes place to form the desired film in the form of an alkyd-epoxy resin complex. Example I. First procedural step Parts of the mind A. Hydrogenated Coconut Fatty Acids .......... 440 B. Pentaerythritol ......................... 412 C. Phthalic Anhydride ................... 552 D. Maleic anhydride .................. 4 E. Xylene ................................ 80 A mixture of the above substances was reacted under reflux at a temperature of 182.2 to 193.3 ° C. until the acid number had fallen to 80. The reaction mixture was cooled to 135 ° C. and 376 parts of tetrachlorophthalic anhydride were added and the reaction mixture was held at 176.7 ° C. for at least 30 minutes. The solution was then cooled to 148.9 ° C. and diluted to a solids content of 50% with xylene.

An analysis of the solution showed: Gardner shade 2+; Viscosity 66 stokes; Acid Number 106.9 (solids basis). Second process step A. After the first step obtained alkyd resin half ester (50 '11, in xylene) ....................... 2573 parts B. triethylamine ................... 251 parts C. Butanol ....................... 105 parts D. Epoxidized linseed oil (8.3 %, oxirane) 261 parts The solution of the alkyd resin half-ester was cooled to 26.7 ' and then the triethylamine and butanol were added and the whole was mixed homogeneously. During the mixing, the temperature rose to 43.3 to 48.9 ° C. The solution was then cooled to below 43.3 ° C. and the epoxidized linseed oil was added with stirring until a homogeneous solution was obtained.

The analysis of the product resulted in: Gardner shade 2; Viscosity 10 stokes; Non-volatile 49.1 ″ /, 0. Hard and elastic films formed from the solution; after curing at 121.1 ° C. for 30 minutes, waterproof and chemically resistant coatings formed.

In addition, 48 parts of triethylamine, 50 parts of epoxidized soybean oil (6.2 oxirane number) and 20 parts of butanol were added to 493 parts of the alkyd resin half-ester obtained in the first step, and the whole was stirred until homogeneous. Analysis of the mixture gave: Gardner shade 2; Viscosity 10.7 stokes; Non-volatile 49.1 0 / ,. By heating for 30 minutes at 121.1 ° C., a tough, elastic, water-resistant and chemical-resistant film was obtained which, however, was somewhat softer than the film obtained with the epoxidized linseed oil (8 ° 11, oxir number). Example II First step of writing Parts by weight A # Pülargonic acid ........................ 400 B. Pcntaerythritol ................ ........ 412 C. Phthalic anhydride ........... ....... 517 D. Maleic anhydride ............... 4 E. Xylene ............. ........... -..._ 80 F. Tetrachlorophthalic Anhydride ....... 376 A mixture of the above substances was reacted as described in Example 1 , then cooled and diluted with xylene to a solids content of 501110. Analysis of the alkyd resin half-ester obtained in this way gave the following results: Gardner shade 1+; Viscosity 10.5 stokes; Non-volatile 50 '/ ,; Acid number 97.4 (based on solids content). Second process step A. Alkyd resin half esters in 50 "1, xylene Solution (according to the first driving step) .................. 2607 parts B. triethylamine ................... 229 parts C. Butanol ....................... 53 parts D. Xylene .......................... 42 parts E. Epoxidized linseed oil (8.00 /, oxirane) 262 parts As indicated in Example I, these substances were mixed. Analysis of the mixture found: Gardner shade 1.5; Viscosity 8 stokes; Non-volatile 49.4 () /, Example 111 First procedural step A. Soy Fatty Acids ................... 500 parts B. Pentaerythritol ................ »... 412 parts C. Phthalic Anhydride ......... .... 570 parts D. Maleic anhydride ............. 4 parts E. Xylene ...... .................... 80 parts F. Tetrachlorophthalic Anhydride ..... 376 parts The preparation of an alkyd resin half-ester from the above substances was carried out in the manner described in Example I.

An analysis of the solution showed: Gardner shade 4; Viscosity 350 stokes; Acid number 93.5 (based on solids content); Non-volatile 50 0 /, x). Second process step A. Esterbarz of the first process step (50 0 /, solution in xylene) . . 2688 pieces B. triethylamine ........... .... 229 parts C. Butanol ....................... 175 parts D. Epoxidized linseed oil (8.3 %, oxirane) 276 parts An analysis of a mixture of these substances resulted in: Gardner shade 3; Viscosity 8.5 stokes; Non-volatile 49.00 / ,. Example IV First procedural stage A. Hydrogenated coconut fatty acid ...... H2 parts B. trimethylol ethane . -. ........... 208 pieces C. Pentaerythritol .................... 236 parts D. Phthalic Anhydride .............. 572 parts E. Xylene ........................... 80 parts F. Maleic anhydride ............. 4 parts A mixture of these substances was reacted according to Example 1 until an acid number of 64 to 68 was reached. The reaction mixture was then cooled to 135.degree. C., 376 parts of tetrachlorophthalic anhydride were added and then, as indicated in Example 1 , boiled again. Analysis of the alkyd resin half ester showed: Non-volatile 50.4 "/" Gardner shade 2; Viscosity 23.5 stokes; Acid number 87.6 (based on solids content). Second process step 2777 parts of a 500% solution of the modified alkyd resin in xylene, 216 parts of triethylamine, 275 parts of epoxidized linseed oil (8.3 %, oxirane oxygen) and 91 parts of butanol were added. Analysis of this mixture revealed. Gardner shade 2; Viscosity 5.2 stokes; Non-volatile 49.10 / ().

Curing at 121.1.degree. C. for 30 minutes gave a hard, flexible film which is comparable to the film obtained according to Example 1.

39 parts of triethylamine, 50 parts of epoxidized safflower oil (7.1 l) and 17 parts of butanol were also added to 505 parts of the alkyd resin half-ester obtained according to this example and the whole was mixed in the usual way until homogeneous.

A tough, elastic film resistant to water and chemicals was obtained from the mixture by curing at 121.1 ° C. for 30 minutes. The film hardness was somewhat lower than that which was achieved with the epoxidized linseed oil; however, the film hardness was sufficient for coating purposes. Other epoxidized oils and esters with a slightly smaller oxirane value, such as soybean oil (6.3 %, oxirani, epoxy-stearyl acetate, and the like, which were used in place of the safflower oil, gave softer and more elastic films. Example V First procedural step A. Pelargonic acid ................... 300 parts B. Trimethylolethane ................ 211 parts C. Pentaerythritol ..... ..... ......... 233 parts D. Phthalic Anhydride .............. 556 parts E. Maleic anhydride ............. 4 parts F. Xylene ........................... 80 parts G. Tetrachlorophthalic Anhydride ..... 372 parts The alkyd resin half-ester according to Example IV was produced from these substances.

The analysis of the ester resulted in: Garnder shade 2-; Viscosity 17.8 stokes; Acid number 93.9 (based on solids content); Non-volatile 50.3 0 / ,.

Second process step There were 2517 parts of a 500% solution of the modified alkyd resin half-ester specified above in xylene, 212 parts of triethylamine, 250 parts of epoxidized linseed oil (8.3 %, oxir number) and 70 parts of butanol, as described in Example 1 , admitted. Analysis showed the following: viscosity 7 stokes; Gardner shade 2 -; Non-volatile 49 0], Example VI First procedural stage An alkyd resin half-ester was obtained according to Example 1V made from the following materials: A. Pelargonic acid .................. 800 parts B. Technical benzoic acid .......... 18 parts C. Pentaerythritol ................... 1030 parts D. Phthalic Anhydride ............. 1280 parts E. Maleic anhydride ............ 10 parts F. Xylene .......................... 200 parts The alkyd ester was then reacted with 1180 parts of hexachloro-endo-methylenetetrahydrophthalic acid. The analysis of the alkyd resin half ester showed: non-400 / "preferably contains between 20 and 300/0 oil or comparable monobasic acid.

The polyols can be used: pentaerythritol, Trünethyloläthan, trimethylolpropane, sorbitol, diethylene glycol, propylene glycol, ethylene glycol, Gly cerin, 1,2,6-hexanetriol-1,2,6-copolymers of styrene and allyl alcohol and etherified with glycolic phenols such as z. The resinous polyols from Dow Chemical Company. Of these polyols, an amount chemically equivalent to the acidity of the mixture is preferably used; however, it can be up to about 10% above and below this amount.

- The first dibasic acid component of the Alkydesters may be any of the known acids. Although phthalic anhydride, tetrahydrophthalic anhydride or hexahydrophthalic anhydride are to be preferred, other dibasic acids such as isophthalic acid, tetraphthalic acid, tetrachlorophthalic anhydride, maleic anhydride, adipic acid, fumaric acid, hexachloro-endo-endohydric acid, hexachloro-endohydric anhydride, can also be used. According to the preferred embodiment of the invention, the second dibasic component must be used in anhydrous form, namely tetrachlorophthalic acid, monochlorophthalic acid, hexachloroendomethylenetetrahydrophthalic acid, phthalic acid, tetrahydrophthalic acid and hexahydrophthalic anhydride. Maleic acid improves the color of alkyd resin solutions, especially when unsaturated fatty acids are used in alkyd resin production.

As indicated in the examples, the dibasic acid can also be used in the anhydrous form for the first process step in order to further modify the alkyd ester after the substantial part of the esterification has been completed. It is believed that these anhydrides promote reaction with the modified alkyd resin half ester and the epoxidized oil . To achieve the best filin hardness and elasticity, tetrachlorophthalic anhydride is preferred. The other dibasic compounds can be used to obtain comparable and softer films and plastics, depending on the particular fat chain and the oxirane content. The free carboxyl groups present in the alkyd resin half-ester react essentially with the oxirane oxygen of the epoxidized oil. In order to achieve optimal film and body hardness, the oxirane equivalent of the epoxy compound outweighs the free carboxyl groups. If one assumes the chemical equivalence corresponding to the acidity of the alkyd resin, then, based on the total weight of the alkyd resin half-ester and the epoxy compound, the amount of epoxidized linseed oil (8.0 to 9.5 % oxirane) is between about 15 and 200 /, and for soybean oil (5.0 to 6.70 /, oxirane) between about 20 and 25 "/ ,. With excess oil , hardness is maintained with higher oxirane values.

Xylene is the preferred solvent for the preparation of the modified alkyd resin half-ester. However, other aromatic solvents, such as toluene, and additionally another solvent, such as butanol, the mono- and dibutyl ethers of ethylene and diethylene glycol, and the mono- or diethyl ethers of ethylene and diethylene glycol in amounts of optionally 1 to about be 5 '/, are used, the additional solvent employed improved volatile 50.2 0 / 56.3 ,; viscosity Stokes;. Gardner color 2; acid number of 92.6 (based on solid content).

Second process step 86 parts diethanolamine (or 83 parts triethylamine) were added to 996 parts of the alkyd resin half-ester obtained after the first process step. 46 parts of butanol, 25 parts of xylene and 125 parts of epoxidized linseed oil were added and the mixture was mixed until homogeneous. Analysis of the end product showed: non-volatile 49.0 0 / ,; Viscosity 2.0 stokes; Gardner shade 2-.

Example VII First Step An alkyl ester was first prepared by mixing 231.4 parts of hydrogenated coconut fatty acid, 43.7 parts of resinous polyol, 223.3 parts of pentaerythritol, 328.6 parts of phthalic anhydride, 2.3 parts of maleic anhydride and 20 parts of xylene; the whole was boiled until an acid number of 76 to 82 was reached, and then 217.5 parts of tetrachlorophthalic anhydride were added. The analysis of the alkyd resin half ester gave: non-volatile 51.5 %; Viscosity 128 stokes; Gardner shade 2+; Acid number 97.8 (based on solids content).

In a second process step, 70 parts of triethylamine, 48 parts of butanol, 13 parts of xylene and 99 parts of epoxidized linseed oil (8.3 % oxirane oxygen) were added to 771 parts of the solution of the alkyd resin half-ester. The whole was mixed until a homogeneous solution was obtained. Analysis of the solution showed: non-volatile 49.5; Viscosity 6 stokes; Gardner shade 2.

For the production of the modified alkyd resin half-ester, which is not claimed here, the specified fatty acids are examples of saturated and unsaturated fatty acids, of fatty oils, vegetable, animal and oceanic origin with 6 to 26, preferably 8 to 20 carbon atoms in the fatty chain. In order to prevent the film from yellowing, the resin is preferably made with saturated fatty acids. Examples of fatty acids contained in or obtained from fatty oils and generally used in a mixture are caproic, daprylic, capric, lauric, myristic, palmitic, stearic, behenic, oleic, erucic, linoleic -, linolenic, arachidonic and clupanodonic acid. The fatty acids can be used at the same time as benzoic acid or a benzoic acid compound or modified by such a compound.

Glyceride oils from alcoholysis, preferably in the presence of a catalyst, with a polyfunctional alcohol before adding the dibasic acid. Examples more saturated and unsaturated fats and oils are cottonseed, grain, rapeseed, soybeans, Safflower, castor oil, dehydrated castor oil, flaxseed, menhaden, anchovy, whale, cod, Tallow and bacon.

It can also be synthetically produced monobasic acids, such as 2-ethylhexonic acid, Benzoic acid, p-tertiary butylbenzoic acid, pelargonic acid and "oxo" -derived acids be used.

The amounts of fatty oil or fatty and monobasic acids used to produce the alkyd ester can vary. In general, the alkyd resin is modified to such an extent that it is between 10 and the clarity of the solution and allows the viscosity to be adjusted.

Tertiary amines are preferred as inhibitors. It can too other volatile amines and volatile alkylamides, such as dimethylformamide, as well weak organic bases and, as less preferred inhibitors, e.g. B. ammonia, Dimethylethanolamine, monoethanolamine, diethanolamine, dipropylamine, diisopropylamine as well as mixtures of these can be used.

The oxirane compounds which can be used for the purposes of the present invention are essentially substituted and unsubstituted long-chain compounds derived from fats which have 6 to 26 carbon atoms in the fatty chain, at least one internal oxirane oxygen and preferably several internal oxirane groups per chain.

In the USA. Patents 2,485,160, 2,813,878, 2,771,472 and 2,569,502, epoxidized oils and epoxidized compounds are described. Unsaturated oils are preferred. Because of good film-forming properties are the epoxidized glyceride, the "preferably between 5 and 12 0/8 to 9.5 0/0 oxirane oxygen, and preferably an iodine value of at least 150 have emphasized. Examples are linseed oil and segregiertes soybean, safflower and For pigmented paints and stoving enamels, epoxidized linseed oil is preferable.

The unsaturated oils or their fatty acids can first be converted into other esters before or after the epoxidation by alkyholysis or esterification with aliphatic or aromatic, saturated or unsaturated, substituted or unsubstituted monohydric or polyhydric alcohols. Epoxidized long-chain fatty esters or epoxidized dimeric or trimeric polymers of these can also be used, e.g. B. mono- and polyepoxy compounds, such as epoxystearyl acetate, epoxystearyl epoxystearate, butyl epoxystearate, octyl epoxy behenate, methyl diepoxystearate, di- (epoxylauryl) adipate, propyltriepoxystearate, allylepoxystearate, and compounds containing about 4 to 12 0/0 oxirane oxygen.

The use of epoxidized compounds of synthetic origin and those made from petroleum are not excluded.

The intended uses and properties of the coating compositions according to the invention are determined, inter alia, by the following factors: 1. Degree of modification of the alkyd resin half-ester by the monobasic acid; 2. Weight ratio of the alkyd resin half ester to the epoxidized oil ; 3. Oxirane content and structure of the epoxidized oil. The film hardness and the overall quality required for the stoving films increase with the oxirane content of the epoxy oil if the amount and type of alkyd resin half-ester remain the same. On the other hand, can be hard to get up soft plastic to tacky films when the preferred Oxiranwert of 8 to 8.5 drops to about 4 0/0. If the oxirane content of the epoxidized oil remains the same, but the percentage of oil or the monobasic acid of the alkyd resin half-ester increases, the films become softer. The weight ratio of the acidic alkyd resin half ester to the epoxidized oil, i.e. H. the type of modification of the alkyd resin half-ester and the oxirane content of the epoxy compound are thus decisive for a given series of desired end properties and are related to one another.

In general, films with essentially the same properties can be obtained by the following preferred combinations: firstly, 2 parts of a short alkyd resin half-ester with 20 to 25 % monobasic acid modification and one part of an epoxidized linseed oil (8 to 9.5 % or more oxirane); second, 6 parts of a longer alkyd resin half-ester with 25 to 40 % monobasic acid modification and 1 part of an epoxidized linseed oil (8 to 9.5 or more oxirane).

The pigmented coating compositions according to the invention are preferably used for the production of stoving coatings. The films obtained with a Sward hardness of about 30 0 / "pass an impact test of about 60 0 /,) GE and with a Sward hardness of about 40" /, an impact test of about 401) /, GE . Conventional films pass by comparison with a Sward hardness of 30 to 40 0 /, only an impact test of about 12 to 20 0/0 GE

The following example shows the composition of a pigmented coating agent preferred as a stoving enamel. Example VIII Parts by weight A. Solution of a binder according to Example 1 107 B. Titanium Dioxide .......................... 195 C. Xylene ................................ 50 D. Monobutyl ether of ethylene glycol ...... 5 The above materials are milled in a ball mill for 16 to 48 hours. Then a further 290 parts of the alkyd resin half-ester-epoxy mixture of Example I and 76 parts of xylene are added and mixed until the mixture is soft and has the following composition: Resin solids .................. 26.90 /, Pigment ...................... 26.90 /, Pigment volume concentration ... 190/0 Pigment-binder ratio ...... 1 No. 4 Ford Cup Viscosity .... 44.8 seconds The mixture was sprayed and cured for 30 minutes at 121 ° C; A water- and chemical-resistant, hard, tough and high-gloss enamel paint film was obtained. Faster curing is achieved at higher temperatures; low temperatures require a longer curing time.

Carbon black, chrome yellow, chrome green, calcium carbonate, barytes, etc. can also be used as pigments. The soluble alkyd resin half-ester epoxy esters are compatible with other soluble resins. If excess amine is used as a neutralizing agent, the alkyd resin half-ester-epoxy mixtures are dispersible in water, and they can be mixed with other water-soluble or water-dispersible substances. As a result, the properties of the films to be formed can be changed in such a way that the films are hard to soft and brightly glossy to matt. In general, the gloss is the smaller -and the film, the less the components are compatible with one another so as soft.

With the coating agents according to the invention, for. B. the following -in Resins soluble in organic solvents or water-dispersible compatible: Phenol-formaldehyde resin, butylated melamine resin and acrylic acid resin emulsion.

It can be z. B. mix 100 parts by weight of a binder prepared according to Example 1 and 2 to 30 parts by weight of a soluble phenol-formaldehyde resin by using a common solvent. The mixtures can be pigmented. A mixture with a melamine bar leads to an increase in the hardness of the film with increasing amounts. The addition of about 2 l) /, or more of the melamine resin also improves the resistance with regard to coloration and gloss as well as the chemical resistance of the film.

Mixtures according to the invention with epoxy compounds which have a low oxirane value of about 4 to 6 % can be modified by treating them with latex solutions or emulsions of synthetic rubber latices, such as butadiene-styrene, or other similar latices, such as polyvinyl acetate emulsions, acrylic acid emulsions or known copolymeric olemulsions are added; Such mixtures harden with the formation of adhesive to tough, elastic, rubber-like films.

In general, a small excess of neutralizing agent is added to the mixtures. In some cases it may be desirable to make the mixtures by adding an emulsifying agent and e.g. B. about 20/0 excess. tertiary in amine, such as triethylamine "as a neutralizing agent and water. The viscosity, however, decreases very slowly with the addition of water, and the emulsions are generally not suitable as coating binders diluted with water. For use in the plastics industry and as additives, however, they can be mixed with other water-soluble substances such as proteins, HarnstQff formaldehyde resins and other water- and solvent-soluble resinous systems that are compatible with the modified alkyd ester-epoxy mixtures are added Laminates and the like

Claims (2)

Claims: 1. Coating agents and varnishes based on modified alkyd resins and epoxy compounds, characterized in that they a) a solvent-soluble, oil- modified alkyd resin half-ester with a residual acidity (acid number of about 80 to 120), b) an epoxy compound, which has 6 to 26 carbon atoms in a fatty acid chain and an internal oxirane oxygen (epoxidized fatty oil) and c) an inhibitor capable of salt formation, which prevents a reaction between the acid group of the modified alkyd ester and the oxirane oxygen of the epoxy compound. 2. Coating agent according to spoke 1, characterized in that the inhibitor is a tertiary amine . 3. Coating agent according to claim 1, characterized in that the inhibitor is a volatile alkylamine. 4. Coating agent according to Claims 1 and 2, characterized by the additional content of a pigment. 5. Coating agent according to claims 1 to 3, characterized by the additional content of a modifying agent. 6. Coating agent according to claim 4, characterized by a resin which is soluble in an organic solvent or dispersible in water. 7. Coating agent according to claim 4, characterized by a synthetic latex. 8. Coating agent according to claim 6, characterized by the additional content of an emulsifying agent and water. Documents considered: Belgian Patent No. 560 432; . USA. Patent No. 2,887,459; L ee and N evi 11 e, "Epoxy Resius", 1957, p. 270; Shell company leaflet on Epikote I-1, September 1957.