EP0424412A1 - Copolymeres contenant des groupes hydroxyles a base de monomeres de vinylester, de vinyles aromatiques et d'hydroxylalkylesters, leur procede de production et leur utilisation dans des agents de revetement - Google Patents

Copolymeres contenant des groupes hydroxyles a base de monomeres de vinylester, de vinyles aromatiques et d'hydroxylalkylesters, leur procede de production et leur utilisation dans des agents de revetement

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Publication number
EP0424412A1
EP0424412A1 EP19890907137 EP89907137A EP0424412A1 EP 0424412 A1 EP0424412 A1 EP 0424412A1 EP 19890907137 EP19890907137 EP 19890907137 EP 89907137 A EP89907137 A EP 89907137A EP 0424412 A1 EP0424412 A1 EP 0424412A1
Authority
EP
European Patent Office
Prior art keywords
weight
component
parts
monomers
vinyl
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP19890907137
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German (de)
English (en)
Inventor
Werner Alfons Jung
Udo Vorbeck
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
BASF Farben und Fasern AG
Original Assignee
BASF Lacke und Farben AG
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Filing date
Publication date
Application filed by BASF Lacke und Farben AG filed Critical BASF Lacke und Farben AG
Publication of EP0424412A1 publication Critical patent/EP0424412A1/fr
Pending legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
    • C08G18/622—Polymers of esters of alpha-beta ethylenically unsaturated carboxylic acids
    • C08G18/6225—Polymers of esters of acrylic or methacrylic acid
    • C08G18/6229—Polymers of hydroxy groups containing esters of acrylic or methacrylic acid with aliphatic polyalcohols
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F212/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an aromatic carbocyclic ring
    • C08F212/02—Monomers containing only one unsaturated aliphatic radical
    • C08F212/04—Monomers containing only one unsaturated aliphatic radical containing one ring
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/10—Esters
    • C08F220/20—Esters of polyhydric alcohols or phenols, e.g. 2-hydroxyethyl (meth)acrylate or glycerol mono-(meth)acrylate
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
    • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
    • C08G18/625—Polymers of alpha-beta ethylenically unsaturated carboxylic acids; hydrolyzed polymers of esters of these acids
    • C08G18/6254—Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups

Definitions

  • the invention relates to copolymers which contain hydroxyl groups and are soluble in organic solvents and can be prepared by means of free radical solution polymerization of vinyl ester, vinyl aromatic and hydroxyalkyl ester monomers and, if appropriate, further copolymerizable monomers, processes for their preparation and their use in coating compositions.
  • Hydroxyl group-containing acrylate polymers are well known, as are coating compositions which contain these polymers as an essential binder component (cf. for example EP-A-103 199, EP-A-52 233, EP-B-39 797, EP-A -136 667, EP-B-64 338).
  • a disadvantage of this process is the very high residual monomer content (ie the amount of unreacted starting monomer, expressed in% by weight, based on the total amount of this monomer originally used) of up to 40% by weight of vinyl ester when using one high vinyl aromatic content of up to 50% by weight and the associated toxicity problems.
  • Another disadvantage with regard to the solvent pollution of the environment when drying the paint films is the high solvent content of the coating agents caused by the high viscosity of the binder solutions.
  • the invention was therefore based on the object of making available copolymers containing hydroxyl groups on the basis of vinyl ester, vinylaromatic and hydroxyalkyl ester monomers and, if appropriate, further copolymerizable monomers which can be prepared by a simple process which can also be used when using a high vinyl aromatic content of up to 50% by weight, based on the total amount of monomers, have a low residual monomer content (-tlO% by weight) and give clear solutions.
  • the coating compositions produced using these copolymers should have the highest possible solids content with a viscosity of 16 to 20 s, which is favorable for processing, measured in the discharge cup according to DIN 4, show good pigmentability and, in particular, coatings with good technological properties ⁇ particularly good hardness.
  • a hydroxyl-containing copolymer (A) which can be prepared by means of free-radical solution polymerization and which is characterized in that the copolymer (A) has an OH number of 50 to 200 mg KOH / g, preferably 70 to Has 150 mg KOH / g and an average molecular weight (number average) of 1500 to 6000 and can be produced by radical solution polymerization at temperatures from 140 to 200 ° C, from
  • vinyl esters of monocarboxylic acids preferably vinyl esters of monocarboxylic acids with 5 to 15 carbon atoms per molecule branched in the t position
  • the branched monocarboxylic acids can be obtained by reacting formic acid or carbon monoxide and water with olefins in the presence of a liquid, strongly acidic catalyst; the olefins can be cracked products of paraffinic hydrocarbons, such as mineral oil fractions, and can contain both branched and straight-chain acyclic and / or cycloaliphatic olefins.
  • olefins When such olefins are reacted with formic acid or with carbon monoxide and water, a mixture of carboxylic acids is formed in which the carboxyl groups are predominantly located on a quaternary carbon atom.
  • Other olefinic starting materials are, for example, propylene triene, propylene tetramer and diisobutylene.
  • the vinyl esters can also be produced from the acids in a manner known per se, e.g. B. by allowing the acids to react with acetylene.
  • vinyl esters of saturated aliphatic are particularly preferred
  • Monocarboxylic acids with 9 - 11 C atoms, which are attached to the -C atom. are branched.
  • the vinyl ester of p-tert-butylbenzoic acid is also particularly preferred.
  • Examples of other suitable vinyl esters are vinyl acetate and vinyl propionate.
  • the amount of components a. is 5 to 25% by weight, preferably 10 to 19% by weight.
  • Component a 2 is a monovinylaromatic compound. It preferably contains 8 to 9 carbon atoms per molecule. Examples of suitable compounds are styrene, vinyltoluenes, ch-methylstyrene, chlorostyrene, o-, m- or p-methylstyrene, 2,5-dimethylstyrene. p-methoxystyrene, p-tert. -Butyl styrene, p-dimethylaminostyrene, p-acetamidostyrene and m-vinylphenol. Vinyl toluenes and in particular styrene are preferably used. The amount of component a ⁇ is 10 to 50% by weight, preferably 20 to 45% by weight.
  • hydroxyalkyl esters of d ⁇ -unsaturated carboxylic acids with primary or secondary hydroxyl groups are suitable. If a high reactivity of the acrylate copolymer is desired, only hydroxyalkyl esters with primary hydroxyl groups can be used; if the polyacrylate is to be less reactive, only hydroxyalkyl esters with secondary hydroxyl groups can be used. Mixtures of hydroxyalkyl esters with primary hydroxyl groups and hydroxyalkyl esters with secondary hydroxyl groups can of course also be used.
  • Suitable hydroxyalkyl esters ei, (B-unsaturated carboxylic acids with primary hydroxyl groups are hydroxyethyl acrylate, hydroxypropyl acrylate, hydroxybutyl acrylate, hydroxyamyl acrylate, hydroxyhexyl acrylate, hydroxyoctyl acrylate and the corresponding methacrylates.
  • suitable hydroxyalkyl esters with a secondary hydroxyl group are 2-hydroxypropyl groups with a secondary hydroxyl group "Hydroxybutyl acrylate, 3-hydroxybutyl acrylate and the corresponding methacrylates.
  • the corresponding esters of other ot / ⁇ -unsaturated carboxylic acids such as crotonic acid and isocrotonic acid can of course also be used.
  • component a 3 can be at least partially a reaction product of one mole of hydroxyethyl acrylate and / or hydroxyethyl methacrylate and an average of two moles of ⁇ -caprolactone.
  • a reaction product of acrylic acid and / or methacrylic acid with the glycidyl ester of a carboxylic acid with a nem tertiary «carbon atom can be used.
  • Glycidyl esters of strongly branched monocarboxylic acids are available under the trade name "Cardura”.
  • the reaction of acrylic acid or methacrylic acid with the glycidyl ester of a carboxylic acid with a tertiary carbon atom can take place before, during or after the polymerization reaction. Care must be taken that the acid number of the finished polyacrylate is in the range from 5 to 30 mg KOH / g, preferably 8 to 25 mg-K0H / g.
  • Component a_ is used in an amount of 10 to 40% by weight, preferably 15 to 35% by weight
  • component a 0 to 40% by weight of other ethylenically unsaturated, copolymerizable monomers (component a.) Can also be used to build up the copolymer (A) containing hydroxyl groups.
  • the selection of these monomers is not particularly critical. However, care must be taken to ensure that the incorporation of these monomers does not lead to undesirable properties of the copolymer. This is how component a is selected. largely according to the desired properties of the curable composition in terms of elasticity, hardness, compatibility and polarity. Preferred as component a. Alkyl esters of olefinically unsaturated carboxylic acids used.
  • Examples include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, isopropyl (meth) acrylate, isobutyl (meth) acrylate, pentyl (meth) acrylate, Isoamyl (meth) acrylate, hexyl (meth ⁇ acrylate, cyclohexyl (meth) acrylate, 2-ethylhexyl (meth), acrylate, octyl (meth) acrylate, 3,5,5-trimethylhexyl (meth) acrylate, Decyl (meth) acrylate, dodecyl (meth) acrylate, hexadecyl (rneth) acrylate, octadecyl (meth) acrylate, octa-decenyl (eth) acrylate and
  • Suitable as component a. are also other ethylenically unsaturated compounds, such as alkoxyethyl acrylates, aryloxyethyl acrylates and the corresponding methacrylates, such as butoxyethyl (meth) acrylate, phenoxyethyl (meth) acrylate; unsaturated carboxylic acids such as, for example, acrylic acid, methacrylic acid, itaconic acid, crotonic acid and half esters of maleic and fumaric acid and mixtures thereof; unsaturated compounds with tertiary amino groups such as N, N'-diethylaminoethyl methacrylate, 2-vinylpyridine, 4-vinylpyridine, vinylpyrroline, vinylquinoline, vinylisoquinoline, N, N'-dimethylaminoethyl vinyl ether and 2-methyl-5-vinylpyridine; Compounds such as acrylonitrile, methacrylonitrile, acrolein and meth
  • the polymerization of the mono components a-. to a. is preferably carried out in the absence of oxygen, for example by working in a nitrogen atmosphere.
  • the reactor is equipped with appropriate stirring, heating and cooling devices and with a reflux condenser in which volatile constituents, such as styrene, are retained.
  • the polymerization reaction is conducted at temperatures from 130 to 200 ⁇ C, preferably 150-180 C ⁇ conducted tion controllers using polymerization initiators and optionally Polymerisa ⁇ .
  • Suitable free-radical initiators are organic peroxides, such as, for example, dibenzoyl peroxide, dicumyl peroxide, cumene hydroperoxide, di-tert-butyl peroxide, tert-butyl hydroperoxide, 2,2-di-tert-butyl peroxybutane, tert-amyl perbenzoate, 1,3-bis (tert.-butylperoxyisopropyl) benzene, diisopropylbenzene monohydroperoxide and diacyl peroxides, such as, for example, diacetyl peroxide, peroxyketal, such as, for example, 2,2-di (tert.-amylperoxy) propane and ethyl-3,3-di- (tert.- amylperoxy) butyrate, thermolabile highly substituted ethane derivatives, for example based on silyl-substituted ethane derivatives and based
  • aliphatic azo compounds such as, for example, azobiscyclohexanenitrile
  • azo compounds there is a risk of yellowing of the polymers which, depending on the intended use of the polymers, can be troublesome, so that in these cases other initiators must be used.
  • the amount of initiator is in most cases 0.1 to 5% by weight, based on the amount of monomers to be processed, but it can also be higher if necessary.
  • the initiator, dissolved in part of the solvent used for the polymerization, is gradually metered in during the polymerization reaction.
  • the initiator feed preferably takes about 1 to 2 hours longer than the monomer feed in order to also achieve a good effect during the post-polymerization phase. If initiators with only a low decomposition rate are used under the present reaction conditions, so it is possible to present the initiator.
  • the reaction is preferably carried out in the presence of polymerization regulators, since clouding of the polymer solutions can thus be avoided better.
  • Polymerization regulators are preferably suitable as regulators, mercaptoethanol being particularly preferably used.
  • Other possible regulators are, for example, alkyl ercaptane, e.g. t-Dodecyl mercaptan, octyl mercaptan, phenyl mercaptan, octyldecyl mercaptan, butyl mercaptan, thiocarboxylic acids, such as thioacetic acid or thiolic acid.
  • regulators are used in an amount of up to 2% by weight, based on the amount of monomers to be processed. They are preferably dissolved in one of the monomer feeds and added with the monomers. The amount of regulator added is preferably constant over time.
  • the polymerization is carried out in a high-boiling, organic solvent which is inert towards the monomers used.
  • suitable solvents are high-boiling alcohols, such as, for example, n-hexanol, 2-ethylhexanol, isooctyl alcohol, isononyl alcohol, isodecyl alcohol, isotridecyl alcohol, cyclohexanol, methylcyclohexanol, benzyl alcohol, methylbenzyl alcohol, tetrahydrofufuryl alcohol, 2,6-diacetone alcohol Dimethyl-4-heptanol, 4-methyl-2-pentanol, tridecanol; Glycols and glycol derivatives, such as, for example, ethylene glycol, 1,2-propylene glycol, 1,3-butylene glycol, 1,4-butanediol, hexylene glycol, 2-ethylhexanediol-1,
  • copolymers (1) containing hydroxyl groups are modified in a second stage, e.g. by reacting with compounds (B) which contain on average 0.8 to 1.5 free NCO groups and at least one tertiary amino group per molecule, this must be the case during the polymerization, ie preparation of the polymers (A) , Solvents used are of course also inert towards the compounds (B). It is essential to the invention that the copolymerization of components a. to a. is carried out as follows:
  • At least 60% by weight, preferably 100% by weight, of the total amount of component a 1 to be used together with part of the total amount of solvent to be used are initially introduced into the reactor and heated to the respective reaction temperature.
  • the remaining amount of the solvent is preferably added gradually together with the catalyst. Any remaining amount of component a. as well as the other monomers (components a_, a 3 and a 4 ) are within a monomer addition period of the same length for all components (is generally
  • any component a. ie the residual amount of component a. which was not initially introduced
  • the amount of any component a. remains constant or decreases within the monomer addition period, the last process variant being preferred.
  • component a. preferably together with components a 3 and a. added.
  • the amount of the components added per unit of time is aa3 ,, and aa4 .. remains constant within the monomer addition period
  • the amount of component a- added per unit of time is varied within the monomer addition period such that the total amount of component a added within the first third of the monomer addition period a ⁇ 15 to 30% by weight, preferably 18 to 26% by weight .-%, the total amount of component a_ is.
  • -%, of the total amount of component a, the total of the addition amounts in the 1st, 2nd and 3rd thirds is 100% by weight.
  • the addition of the components in the manner mentioned promotes, as is assumed, the copolymerization and reduces the homopolymerization of the individual components. In addition, copolymers with a very low residual monomer content are obtained which give clear solutions with a high solids content.
  • the hydroxyl-containing copolymers (A) thus obtained have an average molecular weight (number average) of 1500 to 6000 and an OH number of 50 to 200 mg KOH / g, preferably 70 to 750 mg KOH / g and an amine number of 1 up to 10 mg KOH / g, preferably 1 to 5 mg KOH / g.
  • 50% solutions of the copolymers according to the invention in butyl acetate typically have viscosities of 0.2 to 4 dPas at 23 ° C. Except by using tert. Monomers containing amino groups in the copolymerization can be tert. Amino groups are also introduced into the hydroxyl-containing copolymer (A) by reaction with compounds (B) which contain an average of 0.8 to 1.5, preferably 1, free isocyanate groups per molecule. This process is particularly preferred when the copolymers are to be used for the production of clearcoats.
  • the copolymers (A) are reacted with the compounds (B) in an isocyanatine solvent at temperatures of 10 to 100 ° C., preferably 50 to 80 ° C., if appropriate in the presence of organic tin compounds as catalysts, up to an NCO value of practically zero.
  • the amount of compound (B) is chosen so that the resulting resin has an amine number of 1 to 10 mg KOH / g, preferably 1 to 5 mg KOH / g.
  • the compounds (B) used to introduce the tertiary amino group into the copolymer (A) are prepared by reacting diisocyanates or polyisocyanates with a stoichiometric deficit on a tertiary amine.
  • Suitable for this implementation are tertiary amines of the general formula NR-RR-, where R. preferably denotes an alkanol radical or another hydroxyl-containing radical and may represent R- or R-alkyl or cycloalkyl radicals.
  • Dialkylalkanolamines such as, for example, dimethylethanolamine, diethylethanolamine and their higher homologs or isomers, are preferred.
  • Suitable di- or polyisocyanates are, for example:
  • Aromatic isocyanates such as, for example, 2,4-, 2,6-tolylene diisocyanate and mixtures thereof, 4, 'diphenylmethane diisocyanate, m-phenylene, p-phenylene, 4,4'-diphenyl, 1,5- Naphthalene, 1,4-naphthalene,, • -toluidine, xylylene diisocyanate and substituted aromatic systems, such as dianisidine diisocyanates, 4,4'-diphenyl ether diisocyanates or chlorodiphenylene diisocyanates and higher functional aromatic isocyanates, such as
  • Diisocyanates with different reactive isocyanate groups are preferably used, e.g. Isophorone diisocyanate.
  • the invention also relates to a process for the preparation of hydroxyl-containing copolymers (A) by means of radical solution polymerization, which is characterized in that
  • Component a 15 to 30% by weight, preferably 18 to 26% by weight, of the total amount of component a_, within the second third 25-40% by weight, preferably 30 to 38% by weight and within the last third, 35-60% by weight, preferably 40 to 50% by weight, of the total amount of component a_.
  • the present invention furthermore relates to coating compositions which contain the hydroxyl-containing copolymers according to the invention as a binder component.
  • Suitable hardener components in these coating compositions are aminoplast resins, polyisocyanates and compounds containing anhydride groups.
  • the crosslinking agent is added in such an amount that the molar ratio of the OH groups of the copolymer (A) to the reactive groups of the crosslinking agent is between 0.3 r 1 and 3: 1.
  • Aminoplast resins suitable as hardener components are preferably melamine and / or benzoguanamine resins. There are etherified melamine or benzoguanamine-formaldehyde condensation products. The compatibility of the resins with other film formers and solvents is influenced by the chain length of the etherification alcohol and the degree of etherification.
  • the main etherification components are n- and isobutanol and methanol. Hexamethoxymethylmelamine resins are very important. However, they have the disadvantage that such combinations only harden at temperatures above 150 ° C. and that it is often necessary to add acidic catalysts.
  • crosslink e.g. T. already below 100 ° C.
  • the corresponding urea and urethane resins can also be used.
  • the polyisocyanates used for crosslinking the copolymers A) are the same polyisocyanates which are also used for the preparation of the compound (B). For suitable examples, reference is therefore made to the description of compound (B). Furthermore, the polyisocyanates can also be linked to prepolymers with a higher molecular weight. Adducts of tolylene diisocyanate and trimethylolpropane, a biuret formed from 3 molecules of hexamethylene diisocyanate and the trimers of hexamethylene diisocyanate and 3,5,5-trimethyl-l-isocyanato-3-isocyanatomethylcyclohexane are to be mentioned here.
  • the amount of crosslinker used is chosen so that the ratio of the isocyanate groups of the crosslinker to the hydroxyl groups of component A) is in the range from 0.3: 1 to 3.5: 1. Combinations with polyisocyanates or resins bearing isocyanate groups crosslink quickly, even at room temperature.
  • Suitable hardeners are also compounds or resins which contain carboxylic acid anhydride groups and which react with the polymers according to the invention via ester formation.
  • the curing temperature depends on the reactivity of the anhydride group contained in the combination partner. So it succeeds e.g. with polyfunctional compounds or resins, to provide coating compositions which crosslink at 80 to 120 ° C.
  • the coating compositions according to the invention can also contain customary auxiliaries and additives, such as leveling agents, silicone oils, plasticizers, such as phosphoric acid esters and phthalic acid esters, pigments and fillers, viscosity-controlling additives, matting agents, UV absorbers and light stabilizers.
  • customary auxiliaries and additives such as leveling agents, silicone oils, plasticizers, such as phosphoric acid esters and phthalic acid esters, pigments and fillers, viscosity-controlling additives, matting agents, UV absorbers and light stabilizers.
  • compositions of the invention are suitable for the coating compositions of the invention.
  • low curing temperatures between 20 and 80 ° C can be used (see above) - for the refinish of motor vehicles and especially for use as a primer and filler material.
  • the polyisocyanate solution 1 used in the examples consists of the following components:
  • the paint thinner 1 consists of the following components:
  • the monomer tank I is metered in uniformly over the course of 4.5 hours.
  • the monomer tank II is metered in over the course of 4.5 h so that in the first 90 min. 100 parts are metered in, 200 parts are metered in from the 91st to the 180th minute of the total running time and 300 parts of styrene are metered in during the remaining feed time.
  • the temperature in the boiler is kept at 165-170 ° C during the run. After all feeds have ended, they are repeated within 1 hour
  • the residual content of free vinyl ester monomer in the 71% polymer solution 1 was determined by means of gas chromatography. A residual content of 1.5% by weight was found. (This corresponds to a residual monomer content of 9.6% by weight, based on the total amount of vinyl ester monomer used.).
  • the initial charge is heated to 160-170 ° C. and the contents of monomer tank I and of the initiator tank are evenly metered into the boiler within 4.5 hours.
  • the content of the monomer tank II is metered in over the course of 4.5 hours in such a way that 25% of the amount of styrene is added in the first 90 minutes, 35% of the amount of styrene from the 91st to the 180th minute and 40% of the amount of styrene in the remaining feed time.
  • the following are then added from the initiator tank within 1 h:
  • the temperature is reduced to approx.
  • the thus obtained copolymer solution 2 has a body Fest ⁇ of 64.9% (15 '180 C ⁇ ), and a viscosity of 21 dpa.s (original) or 0.8 dPas.s (50% in butyl acetate), each determined at 23 ° C.
  • the residual content of free vinyl ester monomers in the 65% solution was determined by gas chromatography to be 0.5-1.0% by weight. This corresponds to a residual monomer content of 3.8 to 7.6% by weight, based on the total amount of vinyl ester monomer used.
  • the original copolymer solution 2 obtained (64.9% solids at 15 "180 ° C.) is diluted to 62% solids with methoxypropylacetate (copolymer solution 2a).
  • copolymer solution 2a methoxypropylacetate
  • To 54.35 parts of a tinting paste based on a commercially available OH-acrylate (OH Number of 150 mg KOH / g) 45.65 parts of the copolymer solution 2a (62% solids) are added This master lacquer solution is mixed in a volume ratio of 2: 1 with the polyisocyanate solution 1.
  • the paint dilution 1 is a spray viscosity of 18 s, measured in a DIN 4 flow cup,lich ⁇ sets. from this varnish 1 glass lifts were Untitled angefer ⁇ and 30 min baked at 60 ⁇ C. the Abprüfergeb- nit shows Table 1.
  • Lacquer 1 was also coated on phosphated and with a commercially available 2-component polyurethane filler (OH components ⁇ polyester-modified hydroxyl-containing acrylate with an OH number of 140 - 150 mg KOH / g; isocyanate component "via the biuret structure trimerized hexamethylene diisocyanate) coated steel sheets applied and 30 min. baked at 60 ° C.
  • 2-component polyurethane filler OH components ⁇ polyester-modified hydroxyl-containing acrylate with an OH number of 140 - 150 mg KOH / g; isocyanate component "via the biuret structure trimerized hexamethylene diisocyanate) coated steel sheets applied and 30 min. baked at 60 ° C.
  • the test results are shown in Table 2.
  • Example 1 prepared a copolymer solution 3 as follows:
  • Monomer and initiator tanks are evenly metered in over 4.5 h, - the temperature is kept at 155-160 ° C. Then within 0.5 h 21.6 parts of hydroxyethyl methacrylate and 12 parts of methyl methacrylate
  • copolymer solution 3 had a solids (1 h 130 ⁇ C) of 67.3% and a viscosity of 1.65 dPa.s (50% solution in ethyl glycol acetate at 23 ° C).
  • the residual content of free vinyl ester monomers in the 67.3% polymer solution was determined by means of gas chromatography under the same conditions as in copolymer solution 1. A content of 5.1% by weight was found. This corresponds to a residual monomer content of 33% by weight, based on the total amount of vinyl ester used, taking into account the theoretical solids content of the polymer solution of 70%. Comparative Example 2
  • the monomer and initiator tanks are metered in uniformly over the course of 4.5 hours, while the temperature is kept at 150-155 ° C. Then the monomer tank is removed within 0.5 h
  • the thus obtained copolymer solution 4 has a body Fest ⁇ of 63.8%, the viscosity is original> 40 dPa.s (at 23 ⁇ C).
  • the free vinyl ester monomer content in the 64.8% solution was 1.5-2% by weight. This corresponds to a residual monomer content of 11.5 to 15.2% by weight, based on the total amount of vinyl ester used.
  • the copolymer solution 4 obtained is diluted to 62% solids with methoxy propyl acetate. 45.65 parts of the copolymer solution 4 (62% solids) are added to 54.35 parts of a tinting paste based on a commercially available OH acrylate (OH number 150 mg KOH / g).
  • This stock lacquer solution is mixed with the polyisocyanate solution 1 analogously to Example 2 in a volume ratio of 2: 1.
  • a spray viscosity of 18 s, measured in the DIN 4 discharge cup, is set at 22% by weight, based on the base paint, of paint thinner 1.
  • 2 glass lifts were made with this lacquer and baked at 60 ° C. for 30 minutes.
  • the test results are shown in Table 1.
  • paint 2 was applied analogously to Example 2 on phosphated steel sheets coated with the filler described in Example 2 and baked at 60 ° C. for 30 minutes.
  • the test results are shown in Table 2.
  • the steel sheets were baked at room temperature for 1 h. stored and then subjected to the tests.
  • the direct reflection is measured at a gloss angle of - 30 ° and in the immediate vicinity of the gloss angle at - 30 ° ⁇ 0.3 °.
  • the DOI value determined from this corresponds to the visually perceived sharpness of the mirror image of an object on this surface.
  • the DOI value is also called the sharpness value.
  • the copolymer solution prepared in Example 2 2 (solids 64.9% (15 * 180 ⁇ C) is reacted with 1-methoxypropyl-2 pylacetat diluted to 62% solids and with the Components specified in Table 3 processed into a clear coat 3.
  • the clear lacquer 3 obtained was mixed with the polyisocyanate solution 1 in a volume ratio of 2: 1.
  • the resulting mixture had a viscosity of 16 s (measured in a DIN 4 cup at 23 ° C.). After 4 hours' storage at room temperature of the clear lacquer mixture, the viscosity had risen to 28 s (DIN 4 cup, 23 ° C.), and after 6 hours of storage at room temperature to 68 s (DIN 4 cup, 23 ° C.).
  • 3 glass lifts were made from this lacquer (dry layer thickness 20 .mu.m) and 30 min. baked at 60 ° C. The test results are shown in Table 1.
  • the clear lacquer mixture 3 was also applied directly after the preparation as a clear lacquer by the wet-on-wet method to a commercially available basecoat (metallic basecoat silver based on cellulose acetobutyrate, polyester, melamine resin, wax) and baked at 60 ° C. for 30 min .
  • the basecoat in turn, had previously been applied to phosphated steel sheets coated with the filler described in Example 2.
  • the test results are shown in Table 2.
  • the copolymer solution 4 prepared in comparative example 2 is diluted to 62% solids with 1-methoxypropylacetate-2 and processed into a clear lacquer 4 using the components shown in table 3, analogously to example 3.
  • the clear coat 4 obtained was mixed with the polyisocyanate solution 1 in a volume ratio of 2: 1 and 10% by volume, based on the clear coat 4, of the paint thinner 1 was added.
  • the resulting clearcoat mixture had a viscosity of 19 s (DIN 4 cup, 23 ° C). After 4 hours' storage at room temperature, the viscosity of the mixture had risen so much (beginning to gel) that the
  • Example 3 Analogously to Example 3, 4 glass elevators were made from this lacquer (dry layer thickness 20 ⁇ m) and baked at 60 ° C. for 30 minutes. The test results are shown in Table 1.
  • this lacquer 4 was applied directly after its production analogously to example 3 as a clear lacquer on the basecoat described in example 3 by the wet-on-wet method (layer structure analogous to example 3) and for 30 minutes. baked at 60 ° C.
  • the test results are shown in Table 2.
  • Example 3 In addition, in contrast to Example 3, a shift in the color of the basecoat by the clearcoat 4 was observed.
  • UV absorber (benzotriazole) 1.0 part 1.0 part the catalyst solution consists of the solution of 1 part of dibutyltin dilaurate in 50 parts of butyl acetate, 44 parts of solvent naphtha * and 5 parts of 3-methoxybutyl acetate.

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  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Paints Or Removers (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)

Abstract

Des copolymères contenant des groupes hydroxyles ont un indice OH compris entre 50 et 200 mg KOH/g et un poids moléculaire moyen (moyenne numérique) compris entre 1500 et 6000. Ces copolymères peuvent être obtenus par une polymérisation radicale en solution à des températures comprises entre 130° et 200°C de 5 à 25 % en poids de monomères de vinylester, de 10 à 50 % en poids de monomères de vinyles aromatiques, de 10 à 50 % en poids de monomères d'hydroxylalkylester et, le cas échéant, d'autres monomères. On prend le monomère de vinylester et on y ajoute les autres monomères pendant une durée d'addition égale pour tous les monomères, comme suit: i) la quantité de monomères d'acrylate ajoutée par unité de temps reste constante; ii) par rapport à la quantité totale de monomères de vinyles aromatiques ajoutés, la quantité de monomères de vinyles aromatiques ajoutée pendant le premier tiers de la durée d'addition des monomères est comprise entre 15 % et 30 % en poids, de préférence entre 18 % et 26 % en poids, pendant le deuxième tiers entre 25 % et 40 % en poids, de préférence entre 30 % et 38 % en poids, et pendant le dernier tiers entre 35 % et 60 % en poids, de préférence entre 40 % et 50 % en poids. Procédé de production de ces copolymères et leur utilisation dans des agents de revêtement.
EP19890907137 1988-07-07 1989-06-19 Copolymeres contenant des groupes hydroxyles a base de monomeres de vinylester, de vinyles aromatiques et d'hydroxylalkylesters, leur procede de production et leur utilisation dans des agents de revetement Pending EP0424412A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3823005A DE3823005A1 (de) 1988-07-07 1988-07-07 Hydroxylgruppenhaltie copolymerisate auf der basis von vinylester-,vinylaromat- und hydroxylalkylester-monomeren, verfahren zur ihrer herstellung sowie ihre verwendung in beschichtungsmitteln
DE3823005 1988-07-07

Publications (1)

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EP0424412A1 true EP0424412A1 (fr) 1991-05-02

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EP19890907137 Pending EP0424412A1 (fr) 1988-07-07 1989-06-19 Copolymeres contenant des groupes hydroxyles a base de monomeres de vinylester, de vinyles aromatiques et d'hydroxylalkylesters, leur procede de production et leur utilisation dans des agents de revetement
EP19890111114 Expired - Lifetime EP0349818B1 (fr) 1988-07-07 1989-06-19 Copolymères contenant des groupes hydroxyl à base de monomères d'esters vinyliques, de monomères vinylaromatiques et de monomères d'esters hydroxylalcoyl, procédé de leur préparation et leur usage dans des compositions de revêtement

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Country Link
US (1) US5322897A (fr)
EP (2) EP0424412A1 (fr)
AT (1) ATE79888T1 (fr)
BR (1) BR8907527A (fr)
CA (1) CA1328146C (fr)
DE (2) DE3823005A1 (fr)
ES (1) ES2052820T3 (fr)
WO (1) WO1990000570A1 (fr)

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DE3942592A1 (de) * 1989-12-22 1991-06-27 Basf Lacke & Farben Loesliche vernetzbare copolymerisate auf der basis von vinylester-, vinyaromat- und acrylatmonomeren, verfahren zu ihrer herstellung sowie ihre verwendung in beschichtungsmitteln
DE4038939A1 (de) * 1990-12-06 1992-06-11 Basf Ag Mit luftfeuchtigkeit selbsthaertbare copolymerisate und mischungen
DE4143688B4 (de) 1991-03-30 2007-03-29 Basf Coatings Ag Verwendung eines Mischsystems sowie Verfahren zur Herstellung von Wasserbasislacken und von wasserverdünnbaren Überzugsmitteln
US5268438A (en) * 1991-09-06 1993-12-07 Rohm And Haas Company Aromatic polyester melt strength improver
US5464897A (en) * 1991-12-30 1995-11-07 Ppg Industries, Inc. Aqueous fluoropolymer dispersions
US5342878A (en) * 1991-12-30 1994-08-30 Ppg Industries, Inc. Base neutralized, stable, aqueous dispersion of a hydroxyl functional acrylic polymer and coating compositions prepared therefrom
US5641829A (en) * 1991-12-30 1997-06-24 Ppg Industries, Inc. Coating compositions prepared from base neutralized, stable aqueous dispersion of hydroxyl functional acrylic polymers
US5614590A (en) * 1992-09-17 1997-03-25 Herberts Gesellschaft Mit Beschrankterhaftung Coating agents, process for their preparation and their use for the preparation of transparent top layers on multilayer coatings
US5288828A (en) * 1993-03-08 1994-02-22 The Sherwin-Williams Company Dispersant polymers
DE4317861C1 (de) * 1993-05-28 1994-11-24 Herberts Gmbh Verfahren zur Mehrschichtlackierung von Substraten und Anwendung des Verfahrens
DE4317784A1 (de) * 1993-05-28 1994-12-01 Basf Lacke & Farben Verfahren zur Erzeugung von strukturierten Beschichtungen auf Kunststoffoberflächen
DE4322242A1 (de) * 1993-07-03 1995-01-12 Basf Lacke & Farben Wäßriges Zweikomponenten-Polyurethan-Beschichtungsmittel, Verfahren zu seiner Herstellung und seine Verwendung in Verfahren zur Hestellung einer Mehrschichtlackierung
US5503938A (en) * 1994-10-26 1996-04-02 Minnesota Mining And Manufacturing Company Self-wetting binders for magnetic media
DE19524787C1 (de) * 1995-07-07 1996-09-26 Herberts Gmbh Überzugsmittel, dessen Verwendung und Verfahren zur Mehrschichtlackierung
DE19542119C1 (de) * 1995-11-11 1997-02-13 Herberts Gmbh Überzugsmittel und Verfahren zur Herstellung von Mehrschichtüberzügen
DE19704020A1 (de) * 1997-02-04 1998-08-06 Herberts Gmbh Hydroxylgruppenhaltige Copolymerisate und Verfahren zu ihrer Herstellung
US20090023862A1 (en) * 2007-07-17 2009-01-22 Ppg Industries Ohio, Inc. Solventborne thermosetting compositions containing copolymers of isobutylene type monomers
JP5408888B2 (ja) * 2008-03-13 2014-02-05 日本ペイント株式会社 水分散型樹脂、二液型熱硬化性樹脂組成物及びこれらの製造方法
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CA3145474A1 (fr) 2019-07-31 2021-02-04 Alexandra Steffens Systeme melangeur pour la production d'agents de revetement aqueux a faible teneur en cov
AU2020322642B2 (en) 2019-07-31 2023-08-03 Basf Coatings Gmbh Mixer system for producing aqueous coating materials with low VOC
CN117413016A (zh) 2021-05-28 2024-01-16 巴斯夫涂料有限公司 用于制备水性涂料的混合器体系
WO2023006474A1 (fr) 2021-07-26 2023-02-02 Basf Coatings Gmbh Système de revêtement pelable et procédés de formation du système de revêtement pelable

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Also Published As

Publication number Publication date
ATE79888T1 (de) 1992-09-15
EP0349818A1 (fr) 1990-01-10
DE58902136D1 (de) 1992-10-01
CA1328146C (fr) 1994-03-29
DE3823005A1 (de) 1990-01-11
EP0349818B1 (fr) 1992-08-26
WO1990000570A1 (fr) 1990-01-25
US5322897A (en) 1994-06-21
BR8907527A (pt) 1991-06-11
ES2052820T3 (es) 1994-07-16

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