MXPA97002119A - Composition of pint - Google Patents

Abstract

The present invention relates to a paint composition comprising an anionically stabilized latex polymer, a water soluble or dispersible polymer, formed from a monomer mixture containing at least 20% by weight of a monomer which contains an amino functional group, a sufficient amount of volatile base to reach the pH of the composition to the point where essentially all the polyfunctional amine is in nonionic state and pigment, wherein the paint composition has a PVC of 30 or less and a total concentration of solids from 40 to 80% in pe

Description

Painting composition This invention relates to an aqueous paint composition and more particularly to a paint composition that excels in properties of brilliance and rapidity of drying. The compositions known in the prior art as fast-drying, water-based paint compositions are those containing emulsified polymers, polyfunctional amine and volatile base, as described in the Japanese publication (Ko ai) No. 157463 / 91 However, improvement of the aforementioned composition is needed, as well as the development of a paint composition that can be dried quickly and has excellent brilliance. This invention provides a new fast drying and high gloss paint composition. This invention relates to a paint composition comprising a latex polymer, anionically stabilized, a polymer that disperses or is soluble in water, formed from a monomer mixture containing at least 20% by weight of monomers containing amino functional groups, a sufficient amount of volatile base to reach the pH of the composition to the point where essentially all the polyfunctional amine obtains a nonionic, and pigment state, wherein said paint composition has a PVC of 30 or less and a total solid concentration of 40 to 80% by weight.

In this description, "fast-drying property" means the ability of the paint to dry quickly, as compared to conventional composition. The term "latex" that is used in this disclosure means water-insoluble polymers that can be prepared by conventional polymerization technology, such as emulsion polymerization. The latex polymer is formed from a monomer or mixture of monomers that can form a water insoluble latex polymer capable of forming a film under a coating condition. The latex polymer to be used in the aqueous paint composition of this invention must be anionically stabilized. The term "latex" that is used in this disclosure means water-insoluble polymers that can be prepared by conventional polymerization technology, such as emulsion polymerization. The latex polymer is formed from a monomer or mixture of monomers that can form a water insoluble latex polymer capable of forming a film under a coating condition. This invention can be practiced using a polymer having a more complicated shape, such as a core-shell polymer particle. The anionic character of the latex polymer can be provided by several methods. The most common method is the method by which the anionic surface active agent or dispersing agent is used as the stabilizer during the emulsion polymerization, or the method by means of which said surface active agent or dispersing agent is added to the emulsion after polymerization. The anionic surface active agent may exist in the anionically stabilized latex during or after the polymerization of said latex. The following are useful and available surface active agents and dispersing agents: the salts of aliphatic rosin and naphthenic acid, condensation products of low molecular weight formaldehydes and naphthene sulphonic acid, polymers and carboxylic acid copolymers having a lipophilic balance. suitable hydrophilic, higher alkyl sulfates such as sodium lauryl sulfate, alkyl aryl sulfonate such as dodecylbenzene sulfonate, sodium salt or potassium salt of isopropyl benzenesulfonic acid or isopropyl naphthalenesulfonic acid, sulfosuccinates such as dioctyl sulfosuccinate sodium, alkali metal salts of the alkyl sulfosuccinic acid such as sodium octyl sulfosuccinate, sodium N-methyl-N-palmitoyltaurate, sodium oleyl isethionate (SIC), alkali metal salts of the sulfuric acid polyethoxyethanol of alkyl aryl or sulfonic acid, such as the sodium sulfate polyethoxyethane t-octylphenoxy having from 1 to 5 oxyethylene units, and other anionic surface active agents and dispersing agents which are known in this technological area. Another type of latex polymer having anionic character is of the type that can be obtained as a result of including a small amount of acid groups in the polymer. In this case, the acid group may have the salt form, such as an alkali metal salt or ammonium salt. Examples of said acid group are fragments of the initiator and those which are derived from maleic acid, vinylsulfonic acid, crotonic acid, acrylic acid, methacrylic acid, itaconic acid and others. The third useful type of latex polymer having anionic character is that of latex polymers containing a neutralized basic monomer, such as acrylamide, methacrylamide and so on. The anionic character of the latex polymers can be of more than one type. The latex polymers having anionic character can be prepared by any of the conventional methods. These methods are clearly described in the text that refers to this main issue, such as D.C.

Blackley "Emulsion Polymerization: Theory and Practice" (Emulsion polymerization: Theory and Practice), published in 1965 by Interscience Publishers. The latex polymers are polymers or copolymers prepared from the following monomers: methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, decyl acrylate, methyl methacrylate, ethyl methacrylate, butyl methacrylate, styrene, butadiene, ethylene, vinyl acetate, vinyl esters of versatic acid (monocarboxylic acid with a tertiary chain of C9, Cio and Cu) (this vinyl ester is also known as "vinyl versatate"), vinyl chloride, vinyl pyridine, vinylidene chloride, acrylonitrile, chloroprene, acrylic acid methacrylic acid, itaconic acid, maleic acid, fumaric acid, α, β-ethylene monomers and their esters. Polymers and copolymers of acrylic esters and methacrylic esters are particularly desired. It is desired to prepare said polymers and copolymers by means of the publicly known method, illustrated in the "Emulsion Polymerization of Acrylic Monomers" published by Rohm and Haas Company, Philadelphia, Pennsylvania, E.U.A. in May 1966. Copolymers prepared using butyl acrylate, methyl methacrylate and 2-ethylhexyl acrylate, which act as acrylic esters, and acrylic acid and methacrylic acid, which act like acrylic acids, are favorably used. as well as styrene. The preferred Tg of the latex polymers is in the index of 0 ° C to 70 ° C. The "glass transition temperature" or "Tg" used in this description means the glass transition temperature of the polymer calculated by the Fox equation ("Bulletin of the American Physical Society") 1, 3, page 123 (1956)).

Formula 1 1 / Tg = W? / Tg (l) + 2 / Tg (2) With reference to the copolymer, Wi and 2 mean the fractions by weight of two types of comonomers and the Tg (l) and Tg (2) mean the transition temperatures to glass (unit: absolute temperature) of two types of respective homopolymers. The paint composition of this invention contains a polymer that disperses or is soluble in water, from a monomer mixture containing at least 20% by weight of the monomer containing an amino functional group. As an example, the following monomers are available as amino functional group-containing monomers: 1) The aminoalkyl vinyl sulphides or ethers, wherein the alkyl group may be linear or branched, having from 2 to 3 carbon atoms, and the Nitrogen atom can be a primary, secondary or tertiary nitrogen atom (Description, U.S. Patent No. 2,879,178). In the last example, one of the remaining hydrogen atoms can be substituted by an alkyl, hydroxyalkyl or alkoxyalkyl group, and its alkyl component can have from 1 to 4 carbon atoms, preferably only one carbon atom. The following are specific examples: ß-aminoethylvinyl ether; ß-aminoethylvinyl sulfide; sulfur or N-monomethyl-β-aminoethylvinyl ether; Sulfur or N-monoethyl-β-amino-ethylvinyl ether; and N-monomethyl-3-aminopropylvinyl sulfide or ether. 2) Acrylamide or acrylic esters, such as those presented in formula II.

Chemical formula 1 0 H2C = C (R) C- (X) n-A-NR * Rü; ID In formula II, R is H or CH 3; n is 0 or 1; X is O or N (H); and if n is 0, A is 0 (CH2) x [X is 2 - 3] or (O-alkylene) and; [O-alkylene) and is a poly (oxyalkylene) group having a molecular weight of 88 to 348, and the alkyl groups may be the same or different propylene or ethylene groups]; and if n is 1, A is an alkylene group having 2 to 4 carbon atoms; R * is H, ethyl or methyl group; R ° is H, a phenyl, benzyl, methylbenzyl, cyclohexyl or (d-C6) alkyl group. The following are available as examples of the compounds represented by the chemical formula II: acrylamide or methacrylamide of N-β-aminoethyl; acrylamide or methacrylamide of N- (monomethylaminoethyl); N- (mono-n-butyl) -4-aminobutyl acrylate or methacrylate; methacryloxyethoxyethylamine; and acryloxypropoxypropylamine. 3) The N-acryloxyalkyl oxazoline and N-acryloxyalkyltetrahydro-1,3-oxazine, and the compounds corresponding to the aforementioned oxazoline and oxazine, wherein the "alkyl" link has been replaced by the alkoxyalkyl group and the poly group (alkoxyalkyl). All these compounds are included in the following formula III.

Chemical formula 2 K R¿ (III) In formula III, R is H or CH 3; m is an integer from 2 to 3; R 'is selected from a group comprising hydrogen, a phenyl group, benzyl group and C? -C? 2 alkyl groups, if not directly attached to R2; R 2 is selected from a group comprising hydrogen and C 1 -C 4 alkyl groups, if it is not directly linked to R '; R 'and R2, if they are directly attached to each other, form a ring of 5 to 6 carbons with the carbon atom attached to the ring shown in the above formula. A) Yes, R1 and R2, if they are linked to each other, are selected from a group comprising pentamethylene and tetramethylene groups; A 'is a group (O-alkylene) nu 0 (CmH2m), in which the group (O-alkylene) n is a poly (oxyalkylene) group having a molecular weight of 88 to 348, and the alkyl groups can be equal or different propylene or ethylene groups. The compounds of the formula III can be hydrolysed in secondary amines under various conditions. Hydrolysis produces the compound having the following formula IV.

Chemical formula 3 OR H2C = C (R) C-A'-N (H) - (CmH2m) -0H (IV) The compounds of the above formula III have been disclosed in the description of US Pat. 3,037,006 and U.S. Patent No. 3,502,627, property of the assignee common to this application, and also in the description of the corresponding foreign patent application and the description of the corresponding foreign patents, and the monomeric compounds disclosed in said descriptions can be used for the production of the copolymers that are will use in the composition of this invention. The following are suitable as examples of the compounds of formula III: oxazolidinylethyl methacrylate; oxazolidiniethyl acrylate; 3- (β-methacryloxypropyl) -tetrahydro-l-3-oxazine; 3- (β-methacryloxyethyl) -2,2-pentamethylene oxazolidine; 3- (β-methacryloxyethyl) -2-methyl-2-propyl oxazoline; N-2- (2-acryloxyethoxy) ethyl oxazolidine; N- (2-methacryloxyethoxy) oxazolidine (ethyl; N-2- (2-methacryloxyethoxy) -ethyl-5-methyl oxazolidine; N-2- (2-acryloxyethoxy) ethyl-5-methyl oxazolidine; [2- (2-methacryloxyethoxy) ethyl] -2,2-pentamethylene, 3- [2- (2-methacryloxyethoxy) ethyl] -2,2-dimethyl oxazolidine and 3- [2- (2-methacryloxyethoxy) oxazolidine ethyl) -2-phenyl 4) Polymers of monomers which can easily form amines by hydrolysis are useful in polymer formation of the amine-containing components of this binding composition Examples of such monomers are ketimines and aldimines acryloxy, such as those represented in the following formulas V and VI.

Chemical formula 4 H2C = C (R) -COOA '' N = Q (V) H2C = C (R) -CO (D) n ... i- (B) "._! - (A °) n ° -? - N = Q (VI) In the formula V and VI R is H or CH3; and Q is selected from the group comprising the following; Chemical formula 5 R6 is H or, if it is in a CHR unit, it can be a methyl group; R5 is selected from a group comprising C1-C12 alkyl groups and a cyclohexyl group; R 4 is selected from a group comprising C 1 -C 12 alkyl groups and a cyclohexyl group; R3 is selected from a group comprising a phenyl group, halophenyl group, C? -C12 alkyl groups, a cyclohexyl group and C? -C4 alkoxyphenyl groups; A "is an alkylene group C? -C12; A °, B and D are the same or different oxyalkylene groups having the formula -OCH (R7) -CH (R7) [wherein R7 is H, CH3 or C2H5]; x is an integer from 4 to 5; n ° is an integer from 1 to 200; nt is an integer from 1 to 200; n1 'is an integer from 1 to 200; and n ° -l, n'-lyn "-l have a value from 2 to 200. Examples of the compounds represented by formula V and VI are as follows: 2- [4- (2,6-di ethylheptylidene) amino] ] -ethylmethacrylate; 3- [2- (4-methylpentylidino) -amino] -propyl methacrylate; β- (benzylideneamino) ethyl methacrylate; 3- [2- (4-methylpentylidene) -amino] -ethylmethacrylate; - [4- (2,6-dimethylheptylidene) -amino] ethyl; 12- (cyclopentylidene-a-ino) dodecyl methacrylate; N- (1,3-dimethylbutylidene) -2- (2-methacryloxyethoxy) -ethylamine; N- (benzylidene) -methacryloxyethoxyethylamine; N- (1,3-dimethylbutylidene) -2- (2-acryloxyethoxy) -ethylamine; and N- (benzylidene) -2- (2-acryloxyethoxy) ethylamine. The hydrolysis of the compounds represented by the formulas V and VI in the alkaline, neutral or acidic aqueous medium produces a primary amine or its salt, where -N = Q in the formula is converted to NH2 and 0 = Q. The compounds represented by formulas V and VI have been disclosed in the disclosures of US Pat. Nos. 3,037,969 and 3,497,485, and any of the monomeric compounds disclosed in said descriptions can be used for the preparation of the copolymers that are used in the water-soluble polymer portion of the composition of this invention.

The preferred amine-containing polymers of this invention are soluble in water. The word "soluble in water" means that the polymer is completely soluble in water, in the form of neutral of free base or salt. This solubility preferably covers the whole pH index, and more preferably at a pH index of about 4 to about 10. Although the amine-containing polymers can be useful and are soluble in water, they are insoluble in high pH, but which are soluble or partially soluble in acidic pH, particularly at a pH of about 4 to 7, are not as desirable as those described above. "Partially soluble" means that a part of the polymer is soluble in water or that all the polymer exists as a miscell of molecules or as aggregates, usually the polymer dissolves as highly dilated aggregates in water. The last case is regularly referred to as a "colloidal solution". It is desired that the majority of the polymer be soluble in acidic pH. As explained above, the water-soluble and amine-containing polymers of this invention include both fully soluble polymers and partially soluble polymers. Although amine-containing polymers, which are insoluble in water, having a molecular weight of the lowest molecular weight, may be useful in the molecular weight index of the corresponding water-soluble polymers, they are not as desirable as described above. . These amine-containing polymers which are insoluble in water have the same function as water-soluble polymers. When these water-insoluble polymers are used in place of the water-soluble polymers, the initial cohesive tension of the anionically stabilized latex is improved. However, normally the magnitude of the improvement is not as great as the improvement achieved by the water soluble polymers. Generally, at least 20% by weight of the amine-containing polymers, from the monomers belonging to the aforementioned categories 1, 2, 3 and 4, can be obtained by solution polymerization in aqueous media, acids, alkaline or neutral, depending on the type of the polymer. Generally speaking, this polymerization is carried out in an aqueous medium containing a small amount of organic or inorganic acid, such as acetic acid or hydrochloric acid. The amine-containing polymer contains up to 80% by weight of the copolymer (s) of one, two or more monomers, such as methyl acrylate, acrylamide, methacrylamide and quaternary ammonium salts derived from the amine monomers, such as 2-methacryloxyethyltrimethylammonium chloride. A small amount of relatively insoluble comonomer (s) can be used to obtain the water soluble polymers. The insoluble polymers may contain a larger amount of said comonomers. Examples of said monomers are esters made of alcohol and acrylic acid, esters made of C? -C? 8 alcohols, particularly C? -C alkanol, and methacrylic acid, styrene, vinyltoluene, vinyl acetate, vinyl chloride, vinylidene, substituted styrene, butadiene, substituted butadiene, ethylene and nitriles and amides of acrylic acid or methacrylic acid. The specific monomer or monomers to be used for the production of certain amine-containing polymers depend on the proportion of the amine-containing monomer that is used for the production of the copolymer. Preferably, a co -omer having a relatively high solubility in water is used in the production of the water-soluble polymer. Therefore, these polymers are polymers or copolymers of cationic vinyl monomer (s) and, if desired, nonionics. Examples of the cationic monomers are amines, imines and quaternary ammonium salts. Other monomers described are nonionic. Therefore, these water-soluble copolymers do not contain other acid groups, except for an acid group test amount that may exist due to impurities that exist in the monomer feed or due to a lesser degree of hydrolysis that may occur during synthesis, storage or use. The viscosity average molecular weight of the insoluble, amine-containing polymer is from about 5,000 to about 100,000, and the index from about 15,000 to 90,000 is preferred. The molecular weight of water-soluble polymers can reach a large index. Typically, its viscosity average molecular weight is from about 5,000 to about 300,000, and an index of from about 40,000 to about 100,000 is preferred. The amount of the amine-containing polymer is from about 0.1 to about 20% by weight, preferably from 0.3 to 5% by weight, based on the combined total weight of the anionic latex polymer and the amine-containing polymer. The amine-containing polymer that is soluble in water includes both perfectly soluble polymers and partially soluble polymers. The terminology "polymer containing amine and which is soluble in water" describes the perfectly soluble polymers which may be in the form of free base, neutral form or salt form. While some polymers are soluble over the total pH index, other polymers are soluble, for example, at a pH of about 5 to 10. Other amine-containing polymers are usually insoluble in high pH, but are soluble or partially soluble. in the acidic pH index, particularly at a pH index of about 5 to about 7. The terminology "partially soluble" means that a part of the polymer is soluble in water or that the complete polymer can dissolve as a miscell of molecules or as aggregates, that is, it usually dissolves as aggregates that dilate in water to a high degree. The last situation is usually referred to as a "colloidal solution". It is desired that the majority of the polymer be soluble in acidic pH.

Amine-containing polymers, generally known in this technological area, can be obtained by solution polymerization in acidic, alkaline or neutral aqueous media, depending on the type of the polymer to be formed, as described, for example, in the U.S. Pat. do not. 4,119,600. Generally speaking, this polymerization is carried out in an aqueous medium containing a small amount of organic or inorganic acid, such as acetic acid or hydrochloric acid. The amine-containing polymer has up to 80% by weight percent of the copolymer (s) made from one, two or more monoethylenically unsaturated monomers, such as methyl acrylate, acrylamide and methacrylamide. A small amount of relatively insoluble comonomers can also be used to obtain the water soluble polymer. The water-insoluble polymer can contain a large amount of said comonomers. Examples of said monomers are esters made of C? -C? 8 alcohols and acrylic acid, esters made of C? -C? 8 alcohols, particularly C? ~ C4 alkanols, and methacrylic acid, styrene, vinyl toluene, vinyl, vinyl chloride, vinylidene chloride, substituted styrene, butadiene, substituted butadiene, ethylene and nitriles and amides of acrylic acid or methacrylic acid. The specific comonomer (s) to be used for the production of specific amine-containing polymers depends on the proportion of the amine-containing monomer to be used for the production of said copolymer. Therefore, these polymers are the polymers or copolymers of cationic vinyl monomers and, if desired, nonionics. Examples of cationic monomers are amines and isomers, and the other monomers described are nonionic. Therefore, these water-soluble copolymers do not contain other acid groups except for a test amount of the acid group that could have come from the contaminant existing in the monomer feed or could have existed due to a lesser degree of hydrolysis during the synthesis, storage or use.

Volatile Base The paint composition of this invention requires a volatile base. The type and amount of volatile base to be used should be sufficient to avoid interaction with the anionically stabilized latex polymer and other anionic components present in this fast-drying paint composition, as long as the pH of the composition is removed. to the point where the amino functional group of the amine-containing polymer will be non-ionized (deprotonated), typically at least a pH of 5 and, preferably, a pH of from 7 to 9. An estimated starting point of the amount of volatile base required to reach this point can be calculated from the number of base equivalents required to neutralize all the acid groups in the latex (ie, the acid group of the copolyzed monomers having a carboxylic group, surface active agent and initiator) and the conjugate acid of the amine base. If the amines were not completely deprotonated, the emulsion will show an observable tendency to instability regardless of time, such as increased viscosity and "particle transport" that can be observed with a microscope, an early aggregation / gelatin stage. A volatile base equivalent (the standard is the titrated amount of latex acid and polyamine) is usually sufficient to form a stable system. For a longer stability time, a higher level of volatile base (from 3 to 4 equivalents) will be needed. Although a higher amount of volatile base may be used within the scope of this invention, in that case the "drying speed" of the paint may decrease. If the equipment used in this production method provides an opportunity to lose the volatile base by evaporation at any stage, from the time the volatile base was added until the product has been packed in a sealed container, the amount of volatile amine that will be added to the production equipment must be increased in such a way that this loss is compensated. After coating, the volatile base evaporates and the pH of the composition drops. As long as the pH of the composition falls to the point where the protonation of the amine functional group begins, the amine functional group will become cationic. Although it is believed that this drying rate begins with the conversion of the amino functional group into a cation, in the presence of an anionically stabilized emulsion polymer, the exact mechanism that creates such rapid drying has not been stabilized. Therefore, the present inventors do not intend to link the speed of drying by means of a theory of an exact mechanism. Although not intended to limit its scope, examples of the appropriate base are ammonia, morpholine, alkylamines, 2-dimethyl aminoethanol, N-methyl morpholine, ethylenediamine and mixtures thereof, the preferred base being ammonia. The preferred equivalency ratio of the amines and the acid in the latex polymer is amino / acid = 0.5 - 1.0. In addition, the paint composition of this invention contains a pigment. Titanium dioxide or iron oxides can be used as pigments. The preferred pigment is titanium dioxide. The titanium dioxide favorably used in this invention is one of the rutile type. Although satisfactory brilliance can be obtained with any of the types of titanium dioxide to be used in the paint composition of this invention, one of the high gloss type is preferred since it may give a better effect of this invention. With the paint composition of this invention, the pigment volume concentration (PVC) should be 30 or less, and the total solids concentration should be 40 to 80 weight percent. The preferred PVC is from 10 to 25 and, even more preferred, from 15 to 22. The total preferred solids concentration is from 50 to 65% by weight, even more than 55 to 60% by weight is desired. If the PVC is very high, the brilliance will be adversely affected. If this is very low, the opaque properties will decrease. And, if the total concentration of solids is very high, the work ability will suffer and the production of the paint and coating will be difficult. On the other hand, if the total concentration of solids is very low, a desired drying speed and brightness is not achieved. Incidentally, the aforementioned PVC value is that only for titanium dioxide. And, other organic or inorganic pigments can be used to replace the titanium dioxide or said organic or inorganic pigments can be used together with the titanium dioxide. For example, sunken pigment, ultrafine particulate pigment or colored pigment, or others, may be included. Preferably, the paint composition of this invention additionally contains at least one type of lower alcohols as a solvent. The solvent is the low boiling lower alcohol having a boiling point of less than 10 ° C and, preferably, it is at least one type of solvent selected from a group containing methanol, ethanol and isopropyl alcohol. The solvent that is most desired is methanol. The amount of solvent to be added may change with the type of solvent and composition of the latex, but in general it is from 0.5 to 10% by weight, preferably from 1.0 to 5% by weight. Still more than 1.0 to 3.0% by weight is desired. The drying speed can be improved without damaging the brightness, using the aforementioned solvent. The effect of this invention is achieved when each of the essential requirements described above is met. Naturally, the use of solvent and the use of titanium dioxide are known in the prior art, but a system having a low PVC and a high total concentration of solids, as in this invention, is not known in the system to be rapid of drying. In addition, a paint composition was added to said system in which at least one type of solvent selected from a group comprising lower alcohols, preferably methanol, ethanol and isporyl alcohol, which was not previously known. In the paint composition of this invention, it is not desired to use a wetting agent during the formation of a paint. The drying speed of the paint will improve when no wetting agent is used. In general, although an agent is used to improve the dispersibility of the pigment, the use thereof is not required in the paint composition of this invention. Thus, with the paint composition of this invention, a high gloss coating can be obtained without the use of a wetting agent. In addition to those described above, the ordinary components of the paint, such as the extender, dispersing agent, surface active agent, rheology modifier, thickening agent, drying retardants, antifoaming agents, coloring agent, wax, preservative, heat stabilizer, solvent, agents that prevent film formation, etc. they can be used in the paint composition of this invention. In case of selecting the types and amounts of additives, one must be careful enough to avoid adjusting the pH to a degree where the storage stability will be dominated by the pH of the paint composition or to a degree where the pH after of the coating does not fall sufficiently to the degree of initiating the protonation of the polyamine. Typically, the aqueous paint composition of this invention is prepared in such a way that it has a viscosity of about 100 to about 10,000 centipoise. One can obtain a paint that will become non-sticky in about 15 minutes after application and have a brightness of 60 ° of about 75 when the paint composition of this invention is coated as shown in the examples and maintained at 23 ° C. ° C and 60% humidity. The aqueous paint composition of this invention may contain multivalent metal that is dispersed or soluble in water, such as, for example, a metal ion, salt, complex or oxide. Although the multivalent metal can be added after the paint composition has been prepared, it is desired to add other components after the latex polymer has been modified by a multivalent metal. With the inclusion of the multivalent metal that disperses or is soluble in water, the paint composition can be made to have a better property of rapid drying. As the modification method, although the multivalent metal powder can be dispersed and added to the aqueous paint composition, it is desired to first convert the multivalent metal into a multivalent metal ion complex or form a salt from the multivalent metal ion and its opposite ion, to make the multivalent metal soluble or dispersed in water. The multivalent metal ion complex can be solubilized in an alkaline solution, such as diluted ammonia water having a pH = 9-10. A latex polymer can be modified with a multivalent metal by adding a multivalent metal, soluble or dispersed in water, to the latex polymer, which is maintained at a temperature of 30 to 50 ° C. The multivalent metal ion, such as calcium, aluminum, magnesium, zinc, barium, strontium, etc., can be used. Multivalent metal ion complexes can also be used, such as zinc hexammonia, zinc ammonium bicarbonate, etc. and salts made of multivalent metal ion and its opposite ion, such as, for example, chloride ion, acetate ion or bicarbonate ion. Zinc is the preferred multivalent metal. The multivalent metal ion, salt, complex or oxide is useful in an amount of about 0.1 to 10% by weight, based on the weight of the solid components of the polymer in the latex. The preferred level, based on the weight of the polymer solid in the latex, is from about 0.3 wt% to about 2.0 wt%. Said paint composition of this invention can be used as a paint to cover a wall or as the top cover in a multilayer coating that requires the property of quick drying. Y, since it is not sticky and does not stain easily, the paint composition of this invention can also be used as a single layer elastomeric coating. In addition, it can be used as an emulsion paint, fast drying, indoor or outdoor, such as traffic paint, roof paint, paint for ordinary buildings and paint to cover the interior wall of a bathroom, etc. This invention is best explained by means of the following examples, which are only illustrations and which in no way limit the scope of this invention.

EXAMPLE Preparation of the monomer mixture A 58% solution of polyoxyethylenenononylphenyl ether ammonium sulfate in deionized water and a monomer mixture containing BA / MMA / MMA raio (by weight) = 45/53/2 were slowly added to the stirred solution, to prepare an emulsified monomer mixture.

Polymerization operation, preparation of the emulsion polymer. A solution containing polyoxyethylenenononylphenyl ether ammonium sulfate and deionized water was added in an appropriate reactor equipped with a thermometer, a cooling device and a stirrer, finally heated to 80-85% C. An aqueous solution of sodium carbonate and then a part of the aforementioned monomer emulsion were added to this reactor, the temperature was adjusted to 80-82 ° C. Next, all the aqueous solution (SPS) of sodium persulfate (a solution prepared with the SPS solution in the deionized water) was added to this reactor. Within about 5 minutes, initiation of the polymerization was confirmed by raising the temperature to 3-5 ° C and by changing the external appearance of the reaction mixture. After the heat generation was stopped, the remainder of the monomer mixture and the aqueous solution (SPS) of sodium persulfate (a solution prepared by the SPS solution in the deionized water) were slowly added to the reactor. The addition was made in 2 to 3 hours, so that the heat that had been generated by the polymerization reaction could be removed by cooling. The reaction temperature for the polymerization was maintained at 80-82 ° C by cooling, if necessary. After finishing the addition, the reactor containing the reaction mixture and the feed tube were washed with deionized water and that water was added to the reactor, then cooled to room temperature. The ammonia was added to adjust the pH to 9.5 -10. A 1.25% polyoxazolidinylethyl methacrylate (solid content = 27.5 °), based on the weight of the solid content in the emulsion polymer, which was a polymer containing an amino functional group, soluble in water, was added to the emulsion thus obtained, to obtain the Emulsion 1. Using this Emulsion 1, the paint was prepared using the composition illustrated in Table 1. The brightness and drying property of the paints are shown in Table 2. Finally, Emulsion 2 was prepared by means of an identical procedure, using BA / MMA / MMA = 33/65/2. The registration of the paint composition is shown in Table 1 and the drying property of the paint thus obtained is shown in Table 2. Incidentally, in Examples 13 and 14, the drying property was measured at 22 ° C and 75% RH.

Brightness test method. The prepared paint was covered on a glass plate, using a 5 mil applicator and allowed to dry at room temperature for one week. The reflectivity in the incident angle and the reflection angle of 20 ° and 60 ° were measured.

Evaluation of drying property.

The paint was covered on a glass plate, using a 6 mil applicator, and dried under the illustrated condition. The drying state was evaluated by means of the following standard evaluation indicated below. 0 = Not dry 1 = It felt dry when it was dried with the finger (when the covered surface was touched with the tip of the finger, said tip of the finger was not stained by the sample) 3 = Dry medium (when the covered surface was scraped gently with the tip of the finger, there was no mark of the fingerprint on the covered surface) 5 = Completely dry (when the covered surface was scraped repeatedly and quickly with the tip of the finger there was no mark of the fingerprint on the surface cover). 2 and 4 represent, respectively, the cases in which the condition existed between 1 and 3 and between 3 and 5.

Tamol (SIC) is a dispersing agent of Rohm and Haas Company. Triton is a wetting agent of the Union Carbide Corporation (UCC). Dehydran (SIC) is an antifoam from San Nopco. The RM-8W and RM-2020NPR are thickened by Rohm and Haas Company.

In Table 2, KU indicates the viscosity measured by a Stomer viscometer, and ICI is the viscosity (unit: poises) measured by an ICI viscometer.

Comparative Example 1 A polymer was prepared by the procedure of Example 1, without adding the polymer containing an amino functional group, soluble in water, and the paints were prepared by means of the following registers indicated below, and their property was measured of drying. The results are presented in Table 3.

Table 3 Example 1 Comparative example 1 ° C / 80% RH 0 minute) 0 0 5 0 0 10 0 0 15 1 0 20 1.5 0 25 3 1 30 4 1 35 4.5 2 ° C / 50% RH 0 ^ minute) 0 0 2 0 0 4 1 0 6 1.5 0 8 3 1 10 4.5 1 12 5 2 3 C3 V

Claims (8)

Claims

1. A paint composition comprising an anionically stabilized latex polymer, a water soluble or dispersible polymer, formed from a monomer mixture containing at least 20% by weight of a monomer containing an amino functional group, a sufficient amount of volatile base to reach the pH of the composition to the point where essentially all the polyfunctional amine will be in the nonionic state, and pigment, wherein the paint composition has a PVC of 30 or less and a total solids concentration of 40 to 80% by weight.

2. The paint composition according to claim 1, further comprising at least one solvent, which is a lower alcohol.

3. The paint composition according to claim 2, wherein the amount of the solvent is 0.5 to 10% by weight, based on the weight of the paint composition.

4. The paint composition according to claim 2, wherein the solvent is methanol or ethanol.

5. The paint composition according to claim 1, wherein the pigment is titanium dioxide.

6. The paint composition according to claim 1, wherein the PVC (pigment volume concentration) is from 10 to 25.

7. The paint composition according to claim 1, wherein the total solids concentration is 50 to 65% by weight. The paint composition according to claim 1, wherein the Tg of the latex polymer is from 0 ° C to 70 ° C.