EP1781571A2 - Dispersion de carbonate de strontium et poudre redispersible pouvant etre obtenue a partir de cette dispersion - Google Patents

Dispersion de carbonate de strontium et poudre redispersible pouvant etre obtenue a partir de cette dispersion

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Publication number
EP1781571A2
EP1781571A2 EP05768799A EP05768799A EP1781571A2 EP 1781571 A2 EP1781571 A2 EP 1781571A2 EP 05768799 A EP05768799 A EP 05768799A EP 05768799 A EP05768799 A EP 05768799A EP 1781571 A2 EP1781571 A2 EP 1781571A2
Authority
EP
European Patent Office
Prior art keywords
dispersion
strontium carbonate
particles
organic liquid
crystallization inhibitor
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.)
Withdrawn
Application number
EP05768799A
Other languages
German (de)
English (en)
Inventor
Karl Köhler
Ferdinand Hardinghaus
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.)
Solvay Infra Bad Hoenningen GmbH
Original Assignee
Solvay Infra Bad Hoenningen 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 Solvay Infra Bad Hoenningen GmbH filed Critical Solvay Infra Bad Hoenningen GmbH
Publication of EP1781571A2 publication Critical patent/EP1781571A2/fr
Withdrawn legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • C01F11/186—Strontium or barium carbonate
    • C01F11/187—Strontium carbonate
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01F—COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM, CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THE RARE-EARTH METALS
    • C01F11/00—Compounds of calcium, strontium, or barium
    • C01F11/18—Carbonates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y30/00—Nanotechnology for materials or surface science, e.g. nanocomposites
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K9/00—Use of pretreated ingredients
    • C08K9/04—Ingredients treated with organic substances
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09C—TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES ; PREPARATION OF CARBON BLACK  ; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS
    • C09C1/00—Treatment of specific inorganic materials other than fibrous fillers; Preparation of carbon black
    • C09C1/02—Compounds of alkaline earth metals or magnesium
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/10—Particle morphology extending in one dimension, e.g. needle-like
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/62—Submicrometer sized, i.e. from 0.1-1 micrometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2004/00—Particle morphology
    • C01P2004/60—Particles characterised by their size
    • C01P2004/64—Nanometer sized, i.e. from 1-100 nanometer
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/12—Surface area
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
    • C01P2006/00—Physical properties of inorganic compounds
    • C01P2006/22—Rheological behaviour as dispersion, e.g. viscosity, sedimentation stability
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • C08K3/26—Carbonates; Bicarbonates
    • C08K2003/265—Calcium, strontium or barium carbonate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
    • Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
    • Y10T428/2991—Coated

Definitions

  • the invention relates to dispersions of strontium carbonate in organic liquids, powder obtainable from the dispersions and its use as additive in polymers with reduced birefringence or without birefringence.
  • optical polymers find use for optical articles such as lenses or as functional films for liquid crystal displays.
  • Corresponding-but-because-of-the-orientation of the polymer chains have a tendency to form birefringence during processing; This forms an anisotropic material. As a result, the optical properties deteriorate.
  • One aspect of the invention comprises rod-shaped strontium carbonate particles having a length of at most 1000 nm, preferably not more than 500 nm, in particular not more than 200 nm, dispersed in an organic liquid or water, the dispersion of the particles in the organic liquid using a dispersant ⁇ was witnessed. These limits apply for at least 90% of all particles, preferably for at least 95%, in particular for substantially all particles.
  • rod-shaped means that the length of the particles exceeds the thickness of the particles.
  • the length to thickness ratio is at least 2.
  • organic liquids are organic liquids.
  • organic liquid protic and aprotic organic liquids are useful. Liquids with protons which are so acidic that they react with the strontium carbonate with elimination of CO 2 are less suitable.
  • Suitable as organic liquid are linear or branched alcohols, for example those having 1 to 6 C atoms, linear or branched ketones, for example those having 3 to 10 C atoms, cyclic ketones such as cyclopentanone, hydrocarbons or hydrocarbon mixtures such as petroleum ether, and halogenated hydrocarbons, for example chlorocarbons such as dichloromethane (methylene chloride).
  • Esters of carboxylic acids for example, those of carboxylic acids having, for example, a total of 2 to 6 carbon atoms and alcohols having 1 to 4 carbon atoms are also usable. It is assumed that linear aliphatic ethers or cyclic ethers having preferably up to 6 C atoms are also suitable as solvents.
  • the strontium carbonate can be prepared by known methods, for example from strontium hydroxide and CO2. Such a method is described in WO 97/15530. An aqueous solution of strontium hydroxide is contacted with CC 2 gas in a reactor in which shear, shear and frictional forces act on the reaction mixture. If desired, a crystallization preventing agent may also be present during the precipitation. Although unmodified strontium carbonate can be used in the present invention, it is preferable to use a strontium carbonate containing a crystallization inhibitor (crystallization inhibitor).
  • a crystallization inhibitor crystallization inhibitor
  • the crystallization inhibitor is deprotonated, for example by using the crystallization inhibitor at least partially or completely as the alkali metal salt, for example as the sodium salt or as the ammonium salt.
  • the inhibitor in the form of the acid and add an appropriate amount of the base or as a lye.
  • a compound or a salt of the formula (I) can be used with a carbon chain R and n substituents [A (O) OH]
  • R is an organic radical which has hydrophobic and / or hydrophilic substructures and where R is a low molecular weight, oligomeric or polymeric, optionally branched and / or cyclic carbon chain which optionally contains oxygen, nitrogen, phosphorus or sulfur as heteroatoms, and / or is substituted by radicals which are bound to the radical R via oxygen, nitrogen, phosphorus or sulfur and
  • A is C, P (OH), OP (OH), S (O) or OS (O),
  • n 1 to 10,000.
  • n is preferably 1 to 5.
  • Useful crystallization inhibitors of this type include hydroxy-substituted carboxylic acid compounds.
  • hydroxy-substituted mono- and dicarboxylic acids having 1 to 20 carbon atoms in the chain are very useful, for example citric acid, malic acid (2-hydroxy-1,4-dibutanoic acid) , Dihydroxysuccinic acid and 2-hydroxyoleic acid.
  • citric acid and polyacrylate are very useful, for example citric acid, malic acid (2-hydroxy-1,4-dibutanoic acid) , Dihydroxysuccinic acid and 2-hydroxyoleic acid.
  • citric acid and polyacrylate is very particularly preferred.
  • phosphonic acid compounds with an alkyl (or alkylene) radical having a chain length of 1 to 10 carbon atoms.
  • compounds which have one, two or more phosphonic acid residues are useful. They may additionally be substituted by hydroxy groups.
  • 1-hydroxyethylenediphosphonic acid, 1, 1-diphosphonopropane-2,3-dicarboxylic acid, 2-phosphorus phonobutane-1, 2,4-tricarboxylic acid are also very useful.
  • polyamino acids for example polyaspartic acid.
  • ⁇ sulfur-substituted carboxylic acids having T to 20 carbon atoms (calculated without C-atoms of the COO group), and 1 or more COO- groups, eg. B. sulfosuccinic acid bis-2-ethylhexyl ester (dioctylsulfosuccinat).
  • a crystallization inhibitor it is possible to include, for example, substances used for this purpose, for example shorter-chain or longer-chain polyacrylates, usually in the form of the sodium salt; Polyethers such as polyglycol ethers; Ether sulfonates such as lauryl ether sulfonate in the form of the sodium salt; Esters of phthalic acid and its derivatives; Esters of polyglycerol; Amines such as triethanolamine; and esters of fatty acids, such as stearic acid esters, as mentioned in WO 01/92157.
  • substances used for this purpose for example, for example shorter-chain or longer-chain polyacrylates, usually in the form of the sodium salt; Polyethers such as polyglycol ethers; Ether sulfonates such as lauryl ether sulfonate in the form of the sodium salt; Esters of phthalic acid and its derivatives; Esters of polyglycerol; Amines such as triethanolamine; and esters of fatty acids, such
  • carboxylic acid salts mentioned in WO 97/15530 or their free acids for example citric acid or its alkali or ammonium salts.
  • Preferred crystallization inhibitors have at least one anionic group.
  • the crystallization inhibitor preferably contains as anionic group at least one sulfate, at least one sulfonate, at least two phosphate, at least two Phospho ⁇ at-, at least two carboxylate groups or at least one hydroxy and at least one carboxylate group.
  • the strontium carbonate used for the dispersions according to the invention which according to an alternative does not contain a crystallization inhibitor, but according to a preferred alternative, contains a crystallization inhibitor, is further comminuted in the presence of a dispersing agent. This can be done for example in a bead mill.
  • the dispersant will be further described below.
  • the dispersant should prevent reagglomeration and stabilize the dispersion of the strontium carbonate in the solvent. This is brought about by electrostatic forces which the dispersant exerts on the particle surface, for example by negatively charged substituents, which consequently prevents the reagglomeration, or by steric effects of the dispersant.
  • the Oispe ⁇ giefstoff" a barren m "EHT mönisch ⁇ " ⁇ e groups aüfrdie in kann ⁇ effectively with the surface of the strontium carbonate can occur.
  • Preferred groups are the carboxylate group, the phosphate group, the phosphonate group, the bisphosphonate group, the sulfate group and the sulfonate group.
  • some of the above-mentioned agents are usable, which also have a dispersing effect in addition to a crystallization-inhibiting effect.
  • crystallization inhibitor and dispersant may be identical. Suitable agents can be determined by hand tests.
  • Such agents with crystallization-inhibiting and dispersing action have the consequence that the strontium carbonate forms readily redispersible agglomerates. If one uses such an agent with crystallization-inhibiting and at the same time dispersing action, it can be added in the precipitation and subsequently the deagglomeration, for example in a bead mill as already mentioned above, can be carried out in its presence.
  • desagglomerated strontium carbonate according to the invention which contains dispersants which give the strontium carbonate particles an electropollutant. rust, steric or electrostatic and sterically impart the agglomeration inhibiting or the reagglomeration preventing surface.
  • a particularly advantageous deagglomerated strontium carbonate is characterized in that the dispersant has carboxylate, phosphate, phosphonate, bisphosphonate, sulfate or sulfonate groups that can interact with the strontium carbonate surface and that it has one or more or more ⁇ Ganische remainders R 1 exhibits, which have hydrophobic and / or hydrophilic partial structures auf ⁇ .
  • R 1 is, for example, a low molecular weight, oligomeric or polymeric, optionally branched and / or cyclic carbon chain which optionally contains oxygen, nitrogen, phosphorus or sulfur as heteroatoms, and / or is substituted by radicals which are bonded via oxygen, nitrogen, phosphorus or sulfur to the radical R ⁇ are attached, and the carbon chain optionally "substituted by ⁇ hydrophilic ⁇ or hydrophobic residues.
  • substituting groups are polyether groups.
  • preferred polyether groups have 3 to 50, preferably 3 to 40 insbe ⁇ sondere
  • the alkyleneoxy groups are selected from the group consisting of the methyleneoxy, ethyleneoxy, propyleneoxy and butyleneoxy groups.
  • An advantageous strontium carbonate according to the invention contains a dispersing agent which has groups for attachment or coupling into polymers. These may be groups which chemically effect this coupling or coupling in, for. As OH groups or NH groups or NH 2 groups. The groups may also be those which cause a physical coupling or coupling.
  • the dispersant is suitably adjusted to the solvent in which the strontium carbonate is to be dispersed.
  • Dispersants with more hydrophobic properties are advantageously used for the preparation of dispersions in non-polar or slightly polar solvents.
  • An example of a dispersant which is suitable for the preparation of strontium carbonate dispersions in nonpolar to slightly polar solvents is represented by phosphoric acid esters which have side chains with polyether moieties from ethylene oxide. have oxidei ⁇ whatsoever, for example, in which an oxygen atom of the P (O) group is substituted by a C3-C10 alkyl or alkenyl radical and another oxygen atom of the P (O) group by a polyether function. Another acidic oxygen atom of the P (O) group can interact with the strontium carbonate surface.
  • Such dispersants are available, for example, from BYK CHEMIE under the name Disperbyk® 102, 106 and 111. Nonpolar to low polar solvents are already mentioned above.
  • linear ketones such as methyl ethyl ketone
  • esters of carboxylic acids having, for example, a total of 2 to 6 carbon atoms and alcohols having 1 to 4 carbon atoms
  • hydrocarbons or mixtures thereof such as petroleum distillate (with boiling points of 21 to 55 0 C, 55 to 100 0 C and such hydrocarbons with boiling point above 100 0 C)
  • solvent naphtha or halogenoalkyl especially methylene chloride.
  • strontium carbonate particles are externally hydrophilized.
  • Such strontium carbonate according to the invention is readily dispersible and gives stable dispersions in polar or solvents.
  • the polar groups in particular hydroxyl and amino groups, represent reactive groups which are suitable for coupling or coupling into corresponding plastics, e.g. especially suitable in epoxy resins.
  • Very particularly good properties has a strontium carbonate, which is coated with a dispersant having a plurality of polycarboxylate and a plurality of hydroxyl groups and other substituents that are sterically demanding, z.
  • a very preferred group of dispersants are terminally attached to the polyether groups by hydroxy-substituted polyether polycarboxylates.
  • Such strontium carbonate containing a crystal growth inhibitor and one of the most preferred steric reagglomeration preventing dispersants. center! has, in particular a dispersing agent substituted by polar groups as described above, has the great advantage that it comprises very fine primary particles and at most slightly agglomerated secondary particles which, because they are readily redispersible, are very well applicable, for example themselves can be incorporated well into polymers and not prone to reagglomeration, and even further deagglomerated in the application.
  • strontium carbonate with a crystallization inhibitor is preferably used. If the sum of strontium carboxylate crystallization inhibitor and dispersant (ie calculated without the solvent) is set as 100% by weight, the crystallization inhibitor and the dispersant are preferably present therein in an amount of in each case from 1 to 15% by weight.
  • the strontium carbonate represents the balance to 100% by weight; preferably, the Stron ⁇ tiumcarbonat is in an amount of 20 to 80 wt .-% in the sum of Kristallisati ⁇ onsinhibitor containing Dispe £ giej ⁇ nittel and SrCO j.
  • the dispersions according to the invention preferably contain 20 to 70% by weight of the strontium carbonate, including crystallization inhibitor and dispersant, and 30 to 80% by weight of a solvent or solvent mixture.
  • the dispersions may consist of strontium carbonate, dispersant and solvent and preferably crystallization inhibitor or contain additives.
  • strontium carbonate which is in the form of rod-shaped crystals. It can be prepared, for example, as described in WO 97/15530.
  • the method provides that one sets a Sr (OH) 2 solution with a concentration of 0.1 to 0.75 mol / l of Sr (OH) 2 with carbon dioxide to form a reaction mixture ver ⁇ , wherein per liter of solution About 2 to 30 l of carbon dioxide gas is used, the reaction mixture passes through a continuously operating mixing reactor, in which shear, shear and friction forces of interlocking tools with high relative speed according to the rotor-stator principle are applied to the reaction mixture , Is separated from the reaction mixture after passing through the reactor, the formed Stron ⁇ tiumcarbonat and dried.
  • the shear, shear and frictional forces in the reactor cause the carbon dioxide is introduced in extremely finely divided form in the strontium hydroxide solution.
  • the liter specification of the carbon dioxide gas refers to this on normal conditions. Preference is given to using a crystallization inhibitor in the precipitation, as described above.
  • the obtained strontium carbonate is then dispersed in an organic liquid (examples given above) or water using a dispersant. Dispersants are mentioned above. The dispersion is carried out until the strontium carbonate particles have a maximum length of 200 nm.
  • the dispersion can be carried out in conventional equipment for comminution of already small particles.
  • Very suitable are e.g. Bead mills or dissolvers with balls of glass or other hard material. Pre-mixing is possible, for example in a dissolver (even without glass balls).
  • the comminution can be carried out until the particles have the desired size, for example the length is below 200 nm or even below 150 nm.
  • the dispersions according to the invention after removal of the (preferably organic) solvent, give a powdered strontium carbonate which can be redispersed in solvents to form a dispersion which corresponds to the particle size of the originally prepared dispersion.
  • the dispersion can be produced with comparatively low energy consumption. It is by no means necessary to use the same solvent for the redispersion, which was also used in the preparation of the original dispersion, but it may be advantageous. It was unpredictable that after removal of the solvent from the originally prepared dispersion, a powder is obtainable which then again gives a finely divided dispersion of strontium carbonate comparable to the original dispersion in the same or a different solvent without requiring much energy.
  • strontium carbonate according to the invention as a redispersible powder or as a dispersion or redispersion, is suitable for all purposes for which strontium carbonate or a dispersion thereof is useful.
  • strontium carbonate in the dispersion or the powder after redispersion preferably at least 90% of all particles have a length of less than 1000 nm, more preferably less than 500 nm, most preferably less than 300 nm, particularly preferably less than 200 nm.
  • the dispersion of the strontium carbonate in the chosen solvent, preferably CH 2 Cl 2 or cyclopentanone, if desired produced by dispersing the above-described redispersible powder, is mixed with the plastic precursor or the plastic. A homogeneous distribution is desirable. If necessary, the plastic or plastic precursor is dissolved with a solvent or the viscosity is reduced. After incorporation, the solvent is evaporated if one has been used and, if necessary, polymerization is effected.
  • the chosen solvent preferably CH 2 Cl 2 or cyclopentanone
  • the strontium carbonate is particularly advantageously incorporated into the above-mentioned poly [methyl methacrylate [MMA] -co-benzyl methacrylate [BzMA]]. This is vor ⁇ geous dissolved in tetrahydrofuran before. After introduction of the dispersion, the solvent is evaporated off.
  • Plastics or their precursors obtainable using the strontium carbonate dispersion or the redispersible powder, are likewise the subject of the invention.
  • Precursors are, for example, monomers which are then polymerized in the customary manner, or reactants which are processed under condensation to form polymers.
  • Example 1 Preparation of strontium carbonate with rod-shaped crystal particles
  • the strontium carbonate was prepared as described in WO 97/15530 from a 10% Sr (OH) 2 solution by reaction with CO 2 .
  • citric acid was used in an amount such that the precipitated, dried SrCOs e * wa contained 1.5% by weight of citric acid.
  • the particles produced were rod-shaped.
  • the SrCO 3 had a BET surface area of 32 m 2 / g.
  • Example 2 Preparation of a dispersion of the strontium carbonate prepared in Example 1 in methylene chloride
  • the strontium carbonate is mixed with methylene chloride and Disperbyk 102, a dispersant available from BYK Chemie and a Copo- lymer having acidic groups on the basis of a Phosphorklareesters with side chains with polyvinyl iyetheran too-aus ⁇ poxidmaschineenistrDas Gem ⁇ sclrenthielt 50 "wt: -% Strontiumcar Methyl chloride and 10% by weight of the dispersing agent, the remainder to 100% by weight of methylene chloride formed, and a sample of the mixture was analyzed before dispersing to determine the particle size, the result being "zero" in Table 1 below.
  • a dissolver treatment (with the aid of glass spheres) of a mixture of SrCu.sub.3 and methylene chloride in a weight ratio of 1: 1, without dispersant, was also carried out, and the resulting particle size was determined.
  • Example 3 Dispersing in a bead mill
  • Example 2 was repeated after premixing in a dissolver without glass beads in a bead mill, with comparable results.
  • Example 2 was repeated, but the dispersant used was Melpers® 0030, which is a polyether polycarboxylate whose ether groups are terminally substituted by hydroxy groups and which therefore has a hydrophilic character. It is available from the company SKW.
  • the solvent used was cyclopentanone.
  • the dispersed material was similar to that of Example 2.
  • the dispersion was produced as described in Example 2 by treatment in a dissolver and then a bead mill. The resulting dispersion was removed by removal The strontium carbonate, which received the crystallization inhibitor mentioned in Example 2 and the dispersant (BYK 102) mentioned in Example 2, was obtained as a powder.
  • Example 5 The dispersion of Example 5 was dried by evaporation of the solvent under reduced pressure.
  • the powdered strontium carbonate contained the crystallization inhibitor indicated in Example 2 and the dispersant indicated in Example 5.

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  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Nanotechnology (AREA)
  • Polymers & Plastics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Geology (AREA)
  • Materials Engineering (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • General Physics & Mathematics (AREA)
  • Composite Materials (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Emulsifying, Dispersing, Foam-Producing Or Wetting Agents (AREA)
  • Colloid Chemistry (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

L'invention concerne des dispersions de carbonate de strontium, de préférence modifié, dans des liquides organiques, par ex. dans des alcools, des cétones ou plus particulièrement du chlorure de méthyle. Lesdites dispersions s'utilisent pour produire des polymères présentant une réfraction double réduite ou pas de réfraction double du tout et se prêtent de ce fait à des applications optiques. La poudre qui peut être obtenue après élimination du liquide organique peut être à nouveau convertie en une dispersion, étonnamment avec peu d'énergie.
EP05768799A 2004-08-14 2005-08-09 Dispersion de carbonate de strontium et poudre redispersible pouvant etre obtenue a partir de cette dispersion Withdrawn EP1781571A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102004039485 2004-08-14
DE102005025717A DE102005025717A1 (de) 2004-08-14 2005-06-04 Strontiumcarbonat-Dispersion und daraus erhältliches redispergierbares Pulver
PCT/EP2005/008617 WO2006018180A2 (fr) 2004-08-14 2005-08-09 Dispersion de carbonate de strontium et poudre redispersible pouvant etre obtenue a partir de cette dispersion

Publications (1)

Publication Number Publication Date
EP1781571A2 true EP1781571A2 (fr) 2007-05-09

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EP05768799A Withdrawn EP1781571A2 (fr) 2004-08-14 2005-08-09 Dispersion de carbonate de strontium et poudre redispersible pouvant etre obtenue a partir de cette dispersion

Country Status (7)

Country Link
US (1) US8299157B2 (fr)
EP (1) EP1781571A2 (fr)
JP (1) JP2008510047A (fr)
KR (1) KR101242926B1 (fr)
CN (1) CN101006013B (fr)
DE (1) DE102005025717A1 (fr)
WO (1) WO2006018180A2 (fr)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10357115A1 (de) 2003-12-06 2005-07-07 Solvay Barium Strontium Gmbh Epoxidharz mit erhöhter Schlagbiegefestigkeit und Bruchdehnung
DE102005029309A1 (de) * 2005-06-04 2006-12-07 Solvay Infra Bad Hönningen GmbH Dispersion von desagglomeriertem Bariumsulfat in halogenierten Lösungsmitteln, Ethern oder Estern
DE102005047807A1 (de) * 2005-06-04 2006-12-07 Solvay Infra Bad Hönningen GmbH Modifizierte Nanopartikel
DE102005025720A1 (de) * 2005-06-04 2006-12-07 Solvay Infra Bad Hönningen GmbH Nanopartikelhaltige makrocyclische Oligoester
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KR101242926B1 (ko) 2013-03-13
US20070254982A1 (en) 2007-11-01
JP2008510047A (ja) 2008-04-03
WO2006018180A3 (fr) 2006-06-08
CN101006013A (zh) 2007-07-25
KR20070050474A (ko) 2007-05-15
US8299157B2 (en) 2012-10-30
DE102005025717A1 (de) 2006-02-23
CN101006013B (zh) 2011-03-23

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