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EP2276817A1 - Procédé de synthèse de liants améliorés et présentant une tacticité modifiée - Google Patents

Procédé de synthèse de liants améliorés et présentant une tacticité modifiée

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Publication number
EP2276817A1
EP2276817A1 EP09728210A EP09728210A EP2276817A1 EP 2276817 A1 EP2276817 A1 EP 2276817A1 EP 09728210 A EP09728210 A EP 09728210A EP 09728210 A EP09728210 A EP 09728210A EP 2276817 A1 EP2276817 A1 EP 2276817A1
Authority
EP
European Patent Office
Prior art keywords
meth
polymerization
acrylate
binder
polymer
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.)
Ceased
Application number
EP09728210A
Other languages
German (de)
English (en)
Inventor
Helmut Schwind
Uwe-Martin Wiesler
Cornelia Borgmann
Heike Leuninger
Thomas Schmied
Stefanie Maus
Werner Friedrich
Sven Balk
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.)
Roehm GmbH Darmstadt
Original Assignee
Evonik Roehm GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Evonik Roehm GmbH filed Critical Evonik Roehm GmbH
Publication of EP2276817A1 publication Critical patent/EP2276817A1/fr
Ceased legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D133/00—Coating compositions based on homopolymers or 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 only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Coating compositions based on derivatives of such polymers
    • C09D133/04—Homopolymers or copolymers of esters
    • 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
    • C08F2/00—Processes of polymerisation
    • C08F2/02—Polymerisation in bulk
    • 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
    • C08F20/00—Homopolymers and 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
    • C08F20/02—Monocarboxylic acids having less than ten carbon atoms, Derivatives thereof
    • C08F20/10—Esters

Definitions

  • the invention relates to a process for the preparation of polymers for coating applications by polymerization of esters of acrylic acid or of methacrylic acid or of vinylaromatics or of other free-radically polymerizable vinyl compounds or of monomer mixtures which consist predominantly of such monomers by means of a continuous polymerization process.
  • the invention relates to a solvent-free production process of polymers, can be represented by the binder for paint applications with better processing properties, a very good thermal stability, improved pigment wetting and a higher gloss.
  • (Meth) acrylate or vinyl aromatic binders for paint applications are usually prepared in the prior art by suspension polymerization or solution polymerization.
  • (Meth) acrylates are understood to mean both acrylic acid and its derivatives, for example their esters and also methacrylic acid and its derivatives, for example their esters and mixtures of the abovementioned components.
  • the present invention describes a bulk polymerization process or, more preferably, a continuous bulk polymerization process.
  • a process can be carried out without interfering solvents.
  • Solvents can during a polymerization, for example, of (meth) acrylates cause side reactions such as chain transfer reactions, undesired termination reactions or even polymer-analogous reactions.
  • the handling of solvents under production conditions poses a safety risk.
  • the choice of the solvent can also be limited by the production process - for example, by the required reaction temperature. This, in turn, impairs the later formulation and the form of application, for example with regard to excessively long drying times due to an excessively high boiling solvent.
  • the free choice of the solvent is additionally restricted if the microstructure of the polymer is to be modified by precise adjustment of the reaction temperature.
  • the polymerization of (meth) acrylates or vinylaromatics at high temperatures leads to a higher proportion of so-called head-to-head linkages.
  • Such bonds in a polymer chain significantly reduce the thermal stability of the polymer and may, inter alia, lead to a higher residual monomer content.
  • An alternative removal of the solvent used for production necessitates an additional, unwanted production step and additionally pollutes the environment through the use of two different solvents for production and application.
  • Another disadvantage is the very limited copolymerizability of polar comonomers such as (meth) acrylic acids, amino-functional or hydroxy-functional (meth) acrylates.
  • the proportion of these monomers in the respective monomer mixture must be severely limited because of their water solubility.
  • Another major disadvantage of the suspension polymerization is the required reaction temperature. Such a method can be carried out in a very low temperature window. Temperatures above 100 0 C are basically difficult to adjust due to the water used. A theoretical implementation under pressure and temperatures above 100 0 C is due to the additionally improved solubility of the monomers in such conditions in the
  • EP 0 096 901 describes a continuous feed of a stirred tank with a monomer mixture consisting of styrene, ⁇ -methylstyrene and acrylic acid and the simultaneous removal of the polymer.
  • reaction temperatures a range between 170 0 C and 300 0 C is described, without any influence of the conditions on the polymer microstructure or a distinction of the performance properties is made.
  • pipe reactors are of great importance for carrying out a continuous bulk polymerization.
  • WO 98 04593 describes the continuous preparation of acrylate resins or copolymers of styrene, ⁇ -methylstyrene and acrylic acid.
  • the polymerization is carried out at a temperature between 180 0 C and 260 0 C.
  • the preparation of polymers of analogous composition for dispersing or emulsifier applications in a temperature range between 210 0 C and 246 0 C is designed in US 6,476,170.
  • WO 99 23119 the preparation of adhesive resins in a tubular reactor at a polymerization temperature between 100 0 C and 300 0 C claimed - in WO 2005 066216 the production of hot melt adhesives at temperatures below 130 0 C.
  • the influence of different reaction temperatures on the microstructure of the polymers or the resulting performance properties for example, mentioned in a paint formulation. The same applies to the polymerization process described in WO 98 12229.
  • the aim of the claimed process was the preparation of polymethacrylates for the production of moldings.
  • the procedure described here is limited to a relatively narrow temperature range between 135 0 C and 150 0 C, without this restriction being in any way due to the influence on the polymer microstructure.
  • a new generation of reactors for the continuous bulk polymerization of (meth) acrylates are the so-called Taylor reactors. These reactors can also be used in a wide temperature range. A detailed description of a corresponding process for the preparation of binders for coatings or adhesives or sealants can be found in WO 03 031056, without mentioning here the microstructure of polymer chains.
  • An alternative to the continuous feed of reaction reactors is the
  • Reactive extrusion In WO 2007 087465 a process for the continuous production of poly (meth) acrylates for adhesive applications is presented.
  • the reactive extrusion has the great advantage that with short residence times, a high conversion can be achieved.
  • a targeted adjustment of the microstructure of the products has not yet been described.
  • Reactive extrusion is in principle very similar to kneader technology.
  • WO 2006/034875 describes a process for the continuous bulk polymerization, in particular for the homo- or copolymerization of thermoplastics and elastomers, above the glass transition temperature in a back-mixed kneading reactor. Monomers, catalysts, initiators etc. are continuously fed into the reactor and remixed with already reacted product. At the same time, reacted product is continuously removed from the mixing kneader.
  • the method may, for. B. be applied to the continuous bulk polymerization of MMA.
  • the unreacted monomer is separated by a residual degasser and can be recycled to the reactor.
  • Various polymerization temperatures and their influence on the tacticity of the product have not been investigated.
  • WO 2007/112901 describes a process for the treatment of viscous products, in particular for carrying out homo- or copolymerization of thermoplastics and elastomers, in which a conversion of 90-98% is achieved.
  • Monomer (s), catalyst (s) and / or initiator (s) and / or chain regulators are fed continuously to a back-mixed mixing kneader or a kneading reactor and remixed with already reacted product and the reacted product is removed from the mixing kneader.
  • the product is heated in the kneader up to a boiling temperature, parts of the reactants evaporated and an exotherm of the product absorbed by evaporative cooling.
  • This process can be carried out without or only with very small amounts of solvents.
  • the optimum boiling temperature is set by changing the pressure.
  • the backmixing takes place until a predetermined viscosity of the product is reached.
  • the viscosity is maintained by continuous addition of the educts. An investigation of the influence of the manufacturing temperature on the tacticity of the product is not described.
  • the object of the present invention was to provide improved binders on acrylate or methacrylate (hereinafter short (meth) acrylate) basis for paint formulations.
  • the binders should have a high thermal stability - for example
  • binders prepared according to the invention and thus the coating formulations prepared therefrom should optionally have improved processing properties, such as, for example, reduced melt and / or solution viscosities.
  • a further object was to provide an environmentally friendly process which can be carried out either solvent-free or with a maximum solvent content of 10% by weight, and which can be carried out under high conversion or with only a very small proportion of residual monomers.
  • Another object was the requirements imposed on the high gloss properties of the binder such that the process can be carried out without the addition of auxiliaries, such as emulsifiers, stabilizers or defoamers. solution
  • the objects were achieved by a modified use of special continuous bulk polymerization, by means of which the (meth) acrylates can be polymerized solvent-free with high conversion and in principle can already be considered as prior art.
  • the advantage of a bulk polymerization process over the suspension polymerization is the high purity of the products which can be prepared without the addition of auxiliaries such as emulsifiers, stabilizers, defoamers or other suspension aids.
  • Another advantage is the freedom from water of the product. Binders prepared by suspension polymerization often show reduced gloss and sometimes also dispersancy properties in paints. This effect is due not only to the polymer microstructure, but also to the process-related residual moisture of the polymer.
  • Another advantage of the bulk polymerization over the suspension polymerization is the use of any amounts of hydrophilic comonomers such as (meth) acrylic acids, amino- or hydroxy-functional (meth) acrylates.
  • the advantage over the solution polymerization is the lack or the very small proportion of volatile constituents in the polymerization process or in the primary product.
  • the advantage of the process according to the invention over bulk polymerization in batch mode is the significantly higher conversion which can be achieved and thus the lower proportion of residual monomers in the end product.
  • a particular aspect of the solution according to the invention is the possibility of an individual choice of the polymerization temperature as a function of the requirements of the particular product or the respective application.
  • the properties of the binder to be prepared in terms of gloss, thermal stability, dispersing or wetting properties of pigments and processing properties of the Binder or paint formulation surprisingly depend not only on the composition, the molecular weight, the molecular weight distribution, the functionalities and the end groups, but in particular on the microstructure of the polymer chains.
  • microstructure in this case is meant the tacticity and the proportion of head-to-head links in the chain of the polymer.
  • a poly (meth) acrylate prepared by free radicals is a copolymer of syndiotactic and atactic portions (triads) with only a small proportion of isotactic triads.
  • Polymethacrylates with particularly large syndiotactic proportions can only be prepared by means of technically complicated processes such as anionic polymerization at particularly low temperatures or metal-initiated group transfer polymerization (GTP) with stereoselective catalysts.
  • GTP metal-initiated group transfer polymerization
  • Highly isotactic polymers on the other hand, can almost only be realized by the latter method.
  • a third possibility to make a stereoselective effect on a polymerization is to add a complexing agent in the form of an optically active reagent in the polymerization solution. See, for example, EP 1 611 162.
  • this procedure has several disadvantages: on the one hand, it can be used efficiently only in a solution polymerization, on the other hand, the auxiliary is a further polymerization, which either has to be removed consuming or affects the optical properties of the final product ,
  • Another aspect is the viscosity of the finished paint formulation.
  • the skilled worker is aware that in the formulation of, for example, inorganic pigments in a paint, the viscosity is greatly influenced. This effect is due to the interaction between binder and pigment and is an indication of the quality of the surface wetting of the color additive.
  • binders prepared according to the invention it is surprisingly found that the initial viscosity of such a formulation can be lower and thus more favorable compared to a standard formulation with a corresponding suspension polymer. With the According to the invention, a faster and more efficient pigment dispersion is possible.
  • Another aspect of the paint quality is the gloss. It has already been designed that the gloss is strongly influenced by the water or solvent content in the coating matrix. Surprisingly, however, it has additionally been found that the microstructure too can bring about a great measurable effect on the gloss values of a lacquer. Depending on the polymer composition could be shown that polymers improved with lower gloss values compared to syndiotactic content considered as the standard suspension polymers which were prepared at 80 0 C show.
  • Initiator / controller system may vary the tacticity of a polymer in a limited, but technically quite interesting frame without having to add additional components such as complexing agents to the system. It has also been found that in this regard - for reasons already explained - bulk polymerization is most suitable.
  • a further advantage of the process according to the invention is that it can be transferred without problems to a continuous polymerization process.
  • a further aspect of the present invention is the preparation of (meth) acrylate-based binders which have a thermal stability up to 214 ° C., preferably up to 230 ° C., very particularly preferably up to 250 ° C.
  • thermostability at a given temperature is meant a mass loss of less than 2% by weight in a thermogravimetry (TGA).
  • TGA thermogravimetry
  • the polymerization at higher temperatures favors the formation of so-called head-to-head linkages.
  • These bonds in the polymer chain in which two quaternary carbon atoms are linked together in the case of poly (meth) acrylates, exhibit thermal instability at temperatures above 150 ° C. and can initiate the depolarization of a chain in the event of breakage. This leads to a reduced production yield and an increased residual monomer content in the polymer.
  • such products may show reduced storage or weather stabilities due to unstable bonds.
  • the problem of the head-to-head linkage and thus the reduced thermal stability has been solved in such a way that after the completed polymerization, the product is thermally post-treated.
  • a temperature above 120 0 C, preferably above 160 0 C, more preferably above 180 0 C, and an internal pressure between 1 mbar and 800 mbar, preferably between 5 mbar and 400 mbar and more preferably between 10 mbar and 100 mbar not only are volatile components such as residual monomers or optionally used solvents contained in the product removed, but also the head-to-head bindings are opened and the polymer chains concerned stabilized or depolymerized and removed the resulting low molecular weight compounds.
  • the monomers recovered in this way can optionally even be recycled to the polymerization process.
  • Such a procedure can be implemented in all methods described so far, such as reactive extrusion, the Taylor or tubular reactor and the kneader technology, without problems by means of a connected process step such as flash degassing or a (second) degassing extruder.
  • a connected process step such as flash degassing or a (second) degassing extruder.
  • Monomers which are polymerized are selected from the group of (meth) acrylates, for example alkyl (meth) acrylates of straight-chain, branched or cycloaliphatic alcohols having 1 to 40 carbon atoms, for example methyl (meth) acrylate, ethyl (meth ) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, tert-butyl (meth) acrylate,
  • (meth) acrylates for example alkyl (meth) acrylates of straight-chain, branched or cycloaliphatic alcohols having 1 to 40 carbon atoms, for example methyl (meth) acrylate, ethyl (meth ) acrylate, n-butyl (meth) acrylate, i-butyl (meth) acrylate, tert-butyl (meth) acrylate,
  • Aryl (meth) acrylates such as benzyl (meth) acrylate or phenyl (meth) acrylate, each of which may be unsubstituted or substituted by 1-4-substituted aryl groups; other aromatic substituted (meth) acrylates such as naphthyl (meth) acrylate;
  • Mono (meth) acrylates of ethers
  • Polyethylene glycols, polypropylene glycols or mixtures thereof with 5-80 C atoms such as tetrahydrofurfuryl methacrylate, methoxy (m) ethoxyethyl methacrylate, 1-butoxy-propyl methacrylate, cyclohexyloxymethyl methacrylate, benzyloxymethyl methacrylate, furfuryl methacrylate, 2-butoxyethyl methacrylate, 2-ethoxyethyl methacrylate, allyloxy-methyl methacrylate, 1 - Ethoxybutyl methacrylate, 1-ethoxyethyl methacrylate, ethoxy-methyl methacrylate, poly (ethylene glycol) methyl ether (meth) acrylate and poly (propylene glycol) methyl ether (meth) acrylate.
  • 5-80 C atoms such as tetrahydrofurfuryl methacrylate, methoxy (m) ethoxye
  • the monomer selection may also include respective hydroxy-functionalized and / or amino-functionalized and / or mercapto-functionalized ones and / or olefinically functionalized and / or carboxyl-functionalized acrylates or methacrylates such as allyl methacrylate or hydroxyethyl methacrylate.
  • compositions to be polymerized may also contain other unsaturated monomers which are copolymerizable or homopolymehisable with the abovementioned (meth) acrylates.
  • unsaturated monomers such as 1-hexene, 1-heptane, branched alkenes such as vinylcyclohexane, 3,3-dimethyl-1-propene, 3-methyl-1-diisobutylene, 4-methyl-1-pentene, acrylonitrile , Vinyl esters such as Vinyl acetate, styrene, substituted styrenes having an alkyl substituent on the vinyl group, e.g.
  • ⁇ -methylstyrene and ⁇ -ethylstyrene substituted styrenes having one or more alkyl substituents on the ring such as vinyltoluene and p-methylstyrene, halogenated styrenes such as monochlorostyrenes, dichlorostyrenes, tribromostyrenes and tetrabromostyrenes; heterocyclic compounds such as 2-vinylpyridine, 3-vinylpyridine, 2-methyl-5-vinylpyridine, 3-ethyl-4-vinylpyridine, 2,3-dimethyl-5-vinylpyridine, vinylpyrimidine, 9-vinylcarbazole, 3-vinylcarbazole, 4-vinylcarbazole , 2-methyl-1-vinylimidazole, vinyloxolane, vinylfuran, vinylthiophene, vinylthiolane, vinylthiazoles, vinyloxazoles and isoprenyl ethers; Maleic
  • Divinylbenzene, and the respective hydroxy-functionalized and / or amino-functionalized and / or mercapto-functionalized and / or olefinic funtkionalteken compounds can also be prepared in such a way that they have a hydroxyl and / or amino and / or mercapto functionality and / or an olefinic functionality in a substituent.
  • Examples of such monomers are vinylpiperidine, 1-vinylimidazole, N-vinylpyrrolidone, 2-vinylpirrolidone, N-vinylpirrolidine, 3-vinylpyrrolidine, N-vinylcaprolactam, N-vinylbutyrolactam, hydrogenated vinylthiazoles and hydrogenated vinyl oxazoles.
  • polymerization initiators which are usually added to the monomer phase, are the commonly used radical initiators, in particular peroxides and azo compounds. Under certain circumstances, it may be advantageous to use a mixture of different initiators.
  • the amount used is generally in the range between 0.1 and 5 percent by weight, based on the monomer phase.
  • azo compounds such as azobisisobutyronitrile, 1, 1-azobis (cyclohexancarbonithl) (WAKO V40 ®), 2- (carbamoylazo) -isobutyronitrile (WAKO V30 ®), or peresters such as tert
  • DTBP di (tert-butyl) peroxide
  • DTAP di (tert-amyl) peroxide
  • TBPEHC tert-butyl peroxy (2-ethylhexyl) carbonate
  • other high temperature decomposing peroxides as a radical initiator use.
  • Suitable initiators are octanoyl peroxide, decanoyl peroxide, lauroyl peroxide, benzoyl peroxide, monochlorobenzoyl peroxide, dichlorobenzoyl peroxide, p-ethylbenzoyl peroxide, tert-butyl perbenzoate or azobis (2,4-dimethyl) valeronitrile.
  • chain regulators known per se
  • examples which may be mentioned are: mercaptans, such as n-butyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan tert-dodecyl mercaptan or mercaptoethanol; Thioglycolic acid or thioglycolic acid esters such as thioglycolic acid isooctyl ester or thioglycolic acid lauryl ester; aliphatic chlorine compounds; Enol ether or dimeric ⁇ -methylstyrene.
  • mercaptans such as n-butyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan tert-dodecyl mercaptan or mercaptoethanol
  • Thioglycolic acid or thioglycolic acid esters such as
  • the monomer phase may also contain up to about one percent by weight of polyfunctional monomers, for example ethylene glycol di (meth) acrylate, butanediol di (meth) acrylate or divinylbenzene.
  • polyfunctional monomers for example ethylene glycol di (meth) acrylate, butanediol di (meth) acrylate or divinylbenzene.
  • a solvent or a plasticizer may optionally be added to the system.
  • a solvent or a plasticizer may optionally be added to the system.
  • a maximum of 5 wt .-% are added to the monomer mixture.
  • the usable additives may be, for example, acetates, aliphatics, aromatics or else polyethers or phthalates.
  • a preferred process for the preparation of the polymers according to the invention is the continuously operated kneader technology.
  • a description of such a back-mixed kneading reactor for continuous bulk polymerization of the company List can be found in WO 2006/034875 or in WO 2007/112901.
  • the polymerization is carried out above the glass transition temperature of the polymer.
  • Monomers, catalysts, initiators etc. are continuously fed into the reactor and remixed with already reacted product.
  • reacted product is continuously removed from the mixing kneader.
  • the unreacted monomer is separated by a residual degasser and can be recycled to the reactor.
  • the thermal aftertreatment of the polymer is carried out in this residual degasser.
  • the (meth) acrylate-based bulk polymers are preferably used in coatings, e.g. used on metal, plastic, ceramic or wood surfaces.
  • An example of a coating composition is the use of the polymers according to the invention as binders in architectural paints, ships or container paints.
  • the polymers can likewise be used in road markings, floor coatings, printing inks, heat-sealing lacquers, reactive hot melt adhesives, adhesives or sealants.
  • the tacticity determination of the polymers produced is determined by means of 1 H
  • the metal adhesion of a binder on a steel or a zinc surface was examined by means of cross-cut test in accordance with DIN EN ISO 2409. The evaluation of the result is carried out with values between 0 (particularly good liability) to 5 (no liability). Two values are given in the tables: the first one is the visual assessment after the cut. The second value is the assessment for an additional standard test with tape.
  • the gloss values are measured according to DIN 67630.
  • the measuring angle is indicated in each case.
  • the measurement of the dynamic viscosity is carried out in accordance with DIN EN ISO 53018.
  • DSC dynamic differential thermal analysis
  • thermogravimetric measurements are carried out according to DIN EN ISO 11358.
  • a mixture consisting of 20% by weight of methyl methacrylate, 80% by weight of n-butyl methacrylate, 0.4% by weight of TBPEHC from Degussa Initiators and 0.4% by weight of ethylhexyl thioglycolate (TGEH) is continuously added to a back-mixed kneading reactor Company List, as described for example in WO 2006/034875, supplied and simultaneously reacted polymer continuously led out of the reactor.
  • the internal temperature in the reactor is 140 ° C.
  • the average residence time is about 30 minutes.
  • the polymer melt is immediately after the reactor a flash degasser from List fed, in which at a temperature of 180 0 C remaining unreacted monomers are removed from the polymer and thermally unstable head-to-head linkages are broken. Between reactor and flash degasser, it is possible to take a sample for TGA measurements.
  • Example 1 but with 0.5% TBPEHC at an internal reactor temperature of 120 0 C.
  • 720 g of n-butyl methacrylate, 180 g of methyl methacrylate, 3.6 g of TGEH and 3.6 g of TBPEHC are mixed in a beaker and homogenized for 30 minutes with stirring.
  • the mixture is placed in a mold consisting of two glass plates (20 x 20 cm) and a 6 mm thick plastic piping.
  • the piping is placed between the two glass plates so that it ensures both a constant distance between the plates and the sealing of the mold.
  • the shape is held together by brackets.
  • the filled mold is placed in an oven at 80 ° C. for 3 hours. The mold is then removed from the oven, allowed to cool to room temperature and the polymer plate removed from the mold.
  • the internal temperature is regulated to 85 0 C.
  • the polymerization is completed when the evolution of heat stops.
  • the batch is cooled.
  • the mother liquor is separated from the polymer beads through a filter suction filter, washed thoroughly with demineralized water and dried in an oven at 85 ° C.
  • a 40% solvent solution in Solvesso 100 solvent is premixed with titanium dioxide (1 to 0.5 pigmentation) as a pigment by hand. Steatite balls are placed in this mixture, the vessel is closed and moved on a roll bar for 24 hours. After completion of the dispersion process, the paint is poured off through a sieve and the dynamic viscosity of the filtrate is measured. The gloss is determined on a dried knife lift with a thickness of 200 microns. The adhesion on different substrates is examined according to the standard by means of cross-cut tests.
  • Suspension polymer also over the harder (i.e., higher syndiotactic portion) bulk polymer (Reference Example 8) shows that residual water and the additives required in the suspension polymerization additionally contribute to a decrease in gloss.
  • metal adhesion the effect is a combination of different
  • the formulations of binders prepared according to the invention from Example 2 contain the lowest dynamic viscosity and thus the best processing properties.
  • each other coated samples were body as follows in accordance with the respective measurement standard weathered: in successive cycles, the samples were each irradiated for eight hours at 20 0 C with UV light and then at 60 0 C for four Hours of dew. The coating is carried out according to the procedure described without the addition of titanium dioxide.
  • thermostability measurements of the material produced according to the invention from Example 3 - in each case before and after the degassing step - result in a significant improvement in the thermostability of the polymer.
  • the thermally treated samples show up to a temperature of 214 0 C to a suspension polymers (Reference Example 8) and in batch process prepared substance polymers (Reference Example 7) comparable thermal stability.
  • binders which, despite a significantly higher reaction temperature, have a comparable thermal stability or weathering stability to polymers represented by established production processes. These properties can be attributed to a comparatively low proportion of head-to-head linkages in the polymer.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Materials Engineering (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Paints Or Removers (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Sealing Material Composition (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Graft Or Block Polymers (AREA)

Abstract

L'invention porte sur un procédé de préparation de polymères pour applications de type peinture et vernis, par polymérisation d'esters de l'acide acrylique ou de l'acide méthacrylique, ou de composés vinyles aromatiques, ou d'autres composés vinyliques pouvant être polymérisés par polymérisation radicalaire, ou de mélanges de monomères constitués essentiellement de ces monomères, à l'aide d'un procédé continu de polymérisation. L'invention porte en particulier sur un procédé de préparation sans solvant de polymère, à l'aide duquel il est possible de préparer des liants pour applications de type peinture et vernis présentant des propriétés améliorées de mise en œuvre, une très bonne thermostabilité, un meilleur mouillage des pigments, et un brillant plus élevé.
EP09728210A 2008-04-01 2009-02-02 Procédé de synthèse de liants améliorés et présentant une tacticité modifiée Ceased EP2276817A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102008000914A DE102008000914A1 (de) 2008-04-01 2008-04-01 Verfahren zur Synthese von verbesserten Bindemitteln und veränderter Taktizität
PCT/EP2009/051117 WO2009121640A1 (fr) 2008-04-01 2009-02-02 Procédé de synthèse de liants améliorés et présentant une tacticité modifiée

Publications (1)

Publication Number Publication Date
EP2276817A1 true EP2276817A1 (fr) 2011-01-26

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Application Number Title Priority Date Filing Date
EP09728210A Ceased EP2276817A1 (fr) 2008-04-01 2009-02-02 Procédé de synthèse de liants améliorés et présentant une tacticité modifiée

Country Status (10)

Country Link
US (1) US8426497B2 (fr)
EP (1) EP2276817A1 (fr)
JP (1) JP5634982B2 (fr)
CN (1) CN101550310B (fr)
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CN109535838B (zh) * 2018-11-27 2021-11-23 山东国瓷康立泰新材料科技有限公司 一种光泽度可调的精雕效果的陶瓷喷墨打印墨水及其制备方法
KR102852425B1 (ko) * 2021-10-28 2025-08-29 주식회사 엘엑스엠엠에이 자외선 투과율이 우수한 uv살균용 아크릴계 공중합체의 제조방법
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CA2719850A1 (fr) 2009-10-08
JP5634982B2 (ja) 2014-12-03
US20100298466A1 (en) 2010-11-25
JP2011518238A (ja) 2011-06-23
US8426497B2 (en) 2013-04-23
TWI498390B (zh) 2015-09-01
DE102008000914A1 (de) 2009-10-08
RU2010144330A (ru) 2012-05-10
CN101550310B (zh) 2014-10-22
BRPI0910448A2 (pt) 2015-09-29
CN101550310A (zh) 2009-10-07
HK1138309A1 (en) 2010-08-20
WO2009121640A1 (fr) 2009-10-08

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