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
  • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
  • C09D175/04—Polyurethanes
  • C09D175/06—Polyurethanes from polyesters
• • 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
  • C08G18/08—Processes
  • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
• • 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
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
  • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
• • 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
  • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
  • C08G18/44—Polycarbonates

Definitions

• the invention relates to water-dilutable polyurethane dispersions.
• the invention further relates to their production and their use as paint binders for the production of coatings which have improved hydrolysis stability.
• polyester-polyurethane dispersions are used here as binders.
• the object is therefore to provide a binder for aqueous coating compositions
• the invention therefore relates to water-thinnable polyurethane dispersions containing building blocks derived from multifunctional isocyanates A, polyols B with a moderate molar mass M n of at least 400 g / mol, optionally low molecular weight polyols C with M n below 400 g / mol, compounds D, which have at least two groups reactive toward isocyanate groups and at least one group susceptible to the formation of amons, low molecular weight polyols E which carry no further reactive groups with respect to isocyanate groups, compounds G which are monofunctional with isocyanates.
• CONFIRMATION COPY or contain active hydrogen of different reactivity and are different from the compounds E, and optionally compounds H which are different from B, C, D, E and G and contain at least two groups reactive with isocyanate groups.
• the polyols B contain at least a mass fraction of 85% of polycarbonate polyols 1, preferably at least 90%, and in particular at least 95%. It is particularly preferred to use exclusively polycarbonate polyols B1 for the synthesis of the water-dilutable polyurethane dispersion according to the invention.
• the isocyanates A are at least difunctional and can be selected from aromatic and aliphatic linear, cyclic or branched isocyanates, in particular diisocyanates. If aromatic isocyanates are used, they are preferably used in a mixture with the aliphatic isocyanates mentioned. The proportion of aromatic isocyanates should preferably be chosen so that the number of isocyanate groups introduced into the mixture by these is at least 5% less than the number of isocyanate groups remaining after the first stage in the prepolymer produced. Diisocyanates are preferred, and up to 5% of their mass can be replaced by trifunctional or higher-functional isocyanates.
• the diisocyanates preferably have the formula Q (NCO) 2 , Q being a hydrocarbon radical having 4 to 40 carbon atoms, in particular 4 to 20 carbon atoms, and preferably an aliphatic hydrocarbon radical having 4 to 12 carbon atoms, a cycloaliphatic hydrocarbon radical 6 to 15 carbon atoms, an aromatic hydrocarbon radical having 6 to 15 carbon atoms or an araliphatic hydrocarbon radical having 7 to 15 carbon atoms.
• Q being a hydrocarbon radical having 4 to 40 carbon atoms, in particular 4 to 20 carbon atoms, and preferably an aliphatic hydrocarbon radical having 4 to 12 carbon atoms, a cycloaliphatic hydrocarbon radical 6 to 15 carbon atoms, an aromatic hydrocarbon radical having 6 to 15 carbon atoms or an araliphatic hydrocarbon radical having 7 to 15 carbon atoms.
• Q being a hydrocarbon radical having 4 to 40 carbon atoms, in particular 4 to 20 carbon atoms, and preferably an aliphatic hydrocarbon radical
• melamine-functional isocyanates those which contain heteroatoms in the radical linking the isocyanate groups are also suitable.
• examples of this are mel rftml tional isocyanates which have carbodiimide groups, allophanate groups, isocyanurate groups, urethane groups, acylated urea groups or biuret groups.
• suitable isocyanates reference is made, for example, to DE-A 29 28 552.
• lacquer polyisocyanates based on hexamethylene diisocyanate or l-isocyanato-3J, 5-trimethyl-4-isocyanatomethyl-cyclohexane (ffDr) and / or bis (isocyanato-cyclohexyl) methane, in particular those based exclusively on hexamethylene diisocyanate
• “Lacquer polyisocyanates” based on these diisocyanates are to be understood as meaning the derivatives of these diisocyanates which contain biuret, urethane, uretdione and / or isocyanurate groups and are known in the art, following their preparation if required in a known manner, preferably by distillation of Excess starting diisocyanate have been freed up to a residual mass fraction of less than 0.5%.
• the preferred aliphatic non-functional isocyanates to be used according to the invention include biuret group-containing non-functional isocyanates based on hexamethylene diisocyanate, as described, for example, by the methods of US Pat. Nos. 3,124,605, 3,358,010, 3,903,126, 3 903 127 or 3 976 622 can be obtained, and which consist of mixtures of N, N, N-tris- (6-isocyanatohexyl) ⁇ biuret with minor amounts of its higher homologues, as well as the cyclic trimer of hexamethylene diisocyanate corresponding to the criteria mentioned, such as they can be obtained according to US Pat. No.
• Hexamethylene diisocyanate using trialkylphosphanes Hexamethylene diisocyanate using trialkylphosphanes. Especially the last-mentioned mixtures having a viscosity at 23 ° C. of 50 mPa-s to 20,000 mPa-s and an NCO functionality between 2.0 and 5.0 are preferred.
• the multifractional aromatic isocyanates which are also suitable according to the invention, but preferably to be used in a mixture with the aforementioned meliphatic functional aliphatic isocyanates, are in particular "paint polyisocyanates" based on 2,4-diisocyanatotoluene or its technical mixtures with 2,6-diisocyanatotoluene or on Base of 4,4-diisocyanatodiphenylmethane or its mixtures with its isomers and / or higher homologues.
• Aromatic lacquer polyisocyanates of this type are, for example, the isocyanates containing urethane groups, as are obtained by reacting excess amounts of 2,4-diisocyanatotoluene with polyhydric alcohols such as trimethylolpropane and possibly subsequent removal of the unreacted excess diisocyanate by distillation.
• Other aromatic paint polyisocyanates are, for example, the trisates of the monomeric diisocyanates mentioned by way of example, i.e. the corresponding isocyanato-isocyanurates, which may have been freed from excess monomeric diisocyanates by distillation, preferably after their preparation.
• the amounts of these two components are chosen so that it is ensured that the isocyanate groups of the prepolymer are exclusively or at least 90% bound by (cyclo-) aliphatic.
• the isocyanate component A can also consist of any mixtures of the exemplified multifunctional isocyanates.
• the mass fraction of building blocks derived from the melamine-functional isocyanates A in the polyurethane resin is generally about 10% to 50%, preferably 20% to 35%, based on the mass of the polyurethane resin.
• the polycarbonate polyols B1 preferably have a number-average molar mass M n of 400 g / mol to 5000 g / mol, in particular 600 g / mol to 2000 g / mol.
• Your HydroxylzaM is generally 30 mg / g to 280 mg / g, preferably 40 mg / g to 250 mg / g and in particular 50 mg / g to 200 mg / g. It is preferred to use exclusively polycarbonate polyols B1; However, up to 5% of the mass of the polycarbonate polyols B1 can also be replaced by trivalent or higher polyols.
• the hydroxylza is defined in accordance with DIN 53 240 as the quotient of the particular mass m K0H of potassium hydroxide which has just as many hydroxyl groups as a sample to be examined, and the mass m B of this sample (mass of the solid in the sample in the case of solutions or dispersions); its usual unit is "mg / g".
• m K0H mass of potassium hydroxide
• m B mass of this sample in the case of solutions or dispersions
• the preferred polycarbonate polyols are polycarbonates of aliphatic linear, branched or cyclic alcohols B1 with 2 to 40 carbon atoms, preferably 3 to 20 carbon atoms, and of alkylene ether alkiols with 2 to 4 carbon atoms in the alkylene group and a total of 4 to 20 carbon atoms.
• the polycarbonate polyols B1 are particularly preferably derived from mixtures of two or more of the alcohols B1.
• Suitable alcohols B1 are in particular glycol, diethylene glycol, triethylene glycol, 1,2- and 1,3-propanediol, di- and tripropylene glycol, 1,2- and 1,4-butanediol, 1,6-hexanediol, neopentylglyol and 1 , 4-Dil ⁇ ydroxycyclohexan. Trihydric or polyhydric alcohols are used at most in such an amount that you
• Mass fraction in the total mass of component B1 is up to 10%.
• Suitable polyhydric alcohols are, in particular, trimethylolethane and trimethylolpropane, pentaerythritol and sorbitol. Mixtures of alkylene ether alcohols and alpha-omega-dihydroxyalkanes are particularly preferred.
• the polycarbonate polyols B1 are preferably prepared by uniesters of carbonic acid esters of volatile alcohols such as dimethyl carbonate, diethyl carbonate or cyclic esters of diols such as ethylene or propylene carbonate with the alcohols B1 in question or mixtures thereof. Transesterification catalysts such as titanium or organotin compounds can be used. If, in addition to the polycarbonate polyols, other polyols are used as component B, these are preferably polyether polyols such as, for example, polyoxyethylene polyols, polyoxypropylene polyols, polyoxybutylene polyols and preferably polytetraliydrofurans with terminal OH groups. Other polyols which can be used for the present invention are acrylate polyols or polyolefin polyols, as well as dinier fatty acids reduced to the corresponding diols.
• the mass fraction of building blocks derived from component B in the polyurethane resin is usually between 40% and 90%, preferably between 50% and 80%, based on the mass of the polyurethane resin.
• the low molecular weight polyols C which are optionally used to build up the polyurethane resins generally stiffen the polymer chain. They generally have a molar mass of about 60 g / mol to 400 g / mol, preferably 60 g / mol to 200 g / mol and hydroxyl enes of 200 mg / g to 1500 mg / g. They may contain aliphatic, alicyclic or aromatic groups. Their mass fraction, insofar as they are used, is generally 0.5% to 20%, preferably 1% to 10%, based on the mass of components B to D containing hydroxyl groups.
• the low molecular weight polyols with up to about 20 are suitable Carbon atoms per molecule, e.g. Ethylene glycol, diethylene glycol, 1,2-propanediol, 1,3-propanediol, 1,4-butanediol, 1,2- and 1,3-butylene glycol, 1,2- and 1,4-cyclohexanediol, 1,4- Cyclol ⁇ exandi ⁇ etl ⁇ anol, 1, 6-hexanediol, bisphenol A (2,2-bis (4-hydroxyphenyl) propane), hydrogenated bisphenol A (2,2-bis (4-hydroxycyclohexyl) propane) and mixtures thereof, and also as triols trimethylli- ethane and propane.
• Diols are preferably used exclusively or at least predominantly (generally more than 90% of the mass, preferably more than 95%).
• trifunctional or higher functional compounds are used for the compounds A, B and / or C, care must be taken to ensure that no gelation occurs when the prepolymerization is built up. This can be prevented, for example, by using nonionic compounds together with the trifunctional or higher-functional compounds, the amount of monofunctional compounds then preferably increasing in this way choose is that the average functionality of the component in question does not exceed 2.3, preferably 2.2, and in particular 2.1.
• the anionogenic compounds D contain at least one, preferably at least two groups reactive with isocyanates, such as hydroxyl, amino and mercaptan groups, and at least one acid group which forms anions when at least partially neutralized in aqueous solution or dispersion.
• isocyanates such as hydroxyl, amino and mercaptan groups
• acid group which forms anions when at least partially neutralized in aqueous solution or dispersion.
• polyols preferably diols, which contain at least one carboxyl group, generally 1 to 3 carboxyl groups per molecule, can be used for this purpose.
• Sulfonic acid groups or pliosphonic acid groups are also suitable as groups capable of forming anions.
• Examples of compounds D are, in particular, dihydroxycarboxylic acids, such as alpha, alpha-dialkylolalkanoic acids, in particular alpha, alpha-dimethylolalkanoic acids, such as 2,2-dimethylethyl acetic acid, 2,2-dimethylol propionic acid, 2,2-dimethylol butyric acid, 2,2-dimethylol pentanoic acid and the isomeric tartaric acids, further polyhydroxy acids such as glulconic acid. 2,2-Dimethylolpropionic acid is particularly preferred.
• dihydroxycarboxylic acids such as alpha, alpha-dialkylolalkanoic acids, in particular alpha, alpha-dimethylolalkanoic acids, such as 2,2-dimethylethyl acetic acid, 2,2-dimethylol propionic acid, 2,2-dimethylol butyric acid, 2,2-dimethylol pentanoic acid and the isomeric tartaric
• Compounds D containing amino groups are, for example, 2,5-diaminovaleric acid (ornitliin) and 2,4-diaminotoluenesulfonic acid (5). Mixtures of the suitable compounds D can also be used. The mass fraction of the components derived from component D in the
• Polyurethane resin is generally 2% to 20%, preferably 4% to 10%, based on the mass of the polyurethane resin.
• the compounds E are predominantly, preferably 70% to 90%, in each case at the chain ends of the molecules and terminate them (chain stopper).
• Suitable polyols have at least three, preferably 3 or 4 hydroxyl groups in the molecule. Examples include glycerol, hexanetriol, pentaerythritol, dipentaerythritol, diglycerol, trimethylolethane and trimethylolpropane, the latter being preferred.
• component E is used in excess, that is, in an amount such that the number of hydroxyl groups in the amount of component E used exceeds that of the isocyanate groups still present in the prepolymerizing AB CD.
• the mass fraction of The components derived from component E in the polyurethane resin are usually between 2% and 15%, preferably 5% to 15%, based on the mass of the polyurethane resin. If necessary, the building blocks derived from component E can be found in a mixture with the building blocks derived from G and / or H in the polyurethane resin.
• the compounds G are monofunctional compounds which are reactive with NCO groups, such as monoamines, in particular mono-secondary amines, or monoalcohols.
• Mer may be mentioned, for example: methylamine, ethylamine, n-propylamine, n-butylane in, n-octylamine, laurylamine, stearylamine, isononyloxypropylamine, dimethylamine, diethylamine, di-n- and di-isopropylamine, di-n-butylamine, N-metliylaminopropylamine , Diethyl- and dimethylaminopropylamine, morpholine, piperidine, or suitably substituted derivatives thereof, amidoamines from diprimary amines and monocarboxylic acids, and monoketimines from diprimary amines, and primary / tertiary amines, such as N, N-dimethylaminopropylamine.
• G preference is also given to compounds which contain active hydrogen with different reactivity than NCO groups, in particular compounds which, in addition to a primary amino group, also contain secondary amino groups, or in addition to an OH group also COOH groups or in addition to an amino group (primary or secondary) also have OH groups, the latter being particularly preferred.
• primary / secondary amines such as 3-amino-l-methylaminopropane, 3-
• the polyurethanes obtained in this way can be crosslinked after application to a substrate by the action of high-energy radiation, such as UV rays or electron radiation.
• the mass fraction of building blocks derived from component G in the polyurethane resin is usually between 2% and 20%, preferably 3% and 10%, based on the mass of the polyurethane resin.
• the connections H are the so-called chain extenders.
• the known, preferably functional, compounds which are reactive with NCO groups and which are not identical to B, C, D, E and G and mostly have moderate molar masses of up to 400 g / mol can be used.
• Examples include water, diamines such as ethylenediamine, 1,3-diaminopropane, 1,4-diaminobutane, hexamethylenediamine, isophoronediamine, diethylenetriamine, triethylenetetramine, and the amines can also carry substituents such as OH groups.
• Such polyamines are described, for example, in German Offenlegungsschrift 36 44 371.
• the mass fraction of building blocks derived from component H in the polyurethane resin is usually between 1% and 10%, preferably 2% and 5%, based on the mass of the polyurethane resin.
• the polyurethane resin according to the invention is preferably prepared by first preparing a polyurethane prepolymer from the polyfunctional isocyanates A, the polyols according to B, optionally the low molecular weight polyols C and the compounds D, which has an average of at least 1.7, preferably 2 to 2.5 free
• this prepolymer is then reacted with the compounds E and / or G, optionally in admixture with small amounts of compounds H, in a non-aqueous system, component E in a stoichiometric excess (number of hydroxyl groups in E is greater than the number of isocyanate groups is used in the prepolymer prepared in the first step), and the completely reacted polyurethane resin is preferably finally neutralized and transferred to the aqueous system. If appropriate, the reaction with G can also take place after the transfer s aqueous system.
• the preparation of the polyurethane prepolymer in the first step is carried out according to the known methods.
• the polyfunctional isocyanate A is compared to the polyols B to D used in excess, so that a product with free isocyanate groups results.
• These isocyanate groups are terminal and / or pendant, preferably terminal.
• the amount of melamine-functional isocyanate A is expediently so large that the ratio of the number of isocyanate groups in the amount of component A used to the total number of OH groups in the polyols B to D used is 1.05 to 1.4, preferably 1, Is 1 to 1.3.
• the reaction for the preparation of the prepolymer is normally carried out at temperatures from 55 ° C. to 95 ° C., preferably 60 ° C. to 75 ° C., depending on the reactivity of the isocyanate used, generally without the presence of a catalyst, but preferably in the presence of solvents inactive to isocyanates.
• Solvents which are compatible with water, such as the ethers, ketones and esters mentioned below and N-methylpyrrolidone, can be used in particular for this purpose.
• the mass fraction of this solvent advantageously does not exceed 30%, and is preferably in the range from 5% to 20%, in each case based on the sum of the masses of the polyurethane resin and the solvent.
• the polyfunctional isocyanate A is expediently added to the solution of the other components. However, it also ordered the possibility of first adding the isocyanate A to the polyol B and, if appropriate, component C, and the prepolymer ABC thus produced having component D, which was dissolved in a solvent which is inactive with isocyanates, preferably N-methylpyrrolidone or ketones, to implement the prepolymer ABCD.
• isocyanates preferably N-methylpyrrolidone or ketones
• the prepolymer ABCD or its solution is then reacted with compounds according to E and / or G, optionally in a mixture with H, the temperature expediently in the range from 50 ° C. to 160 ° C., preferably between 70 ° C. and 140 ° C lies until the NGO content in the reaction mixture has practically dropped to zero. If the compound E is used, it is added in excess (the number of hydroxyl groups in E exceeds the number of isocyanate groups in the prepolymer ABCD).
• the amount of E is inevitably such that the ratio of the number of NCO groups in the prepolymerizing ABCD or of the prepolymer ABCD (G / H) which has possibly already been reacted with compounds according to G and / or H to the number of the reactive ones Groups of E 1: 1.05 to 1: 5, preferably 1: 1 to 1: 3.
• the mass of G and / or H can be 0% to 90%, preferably 2% to 20%, based on the mass of E.
• Tertiary amines are particularly suitable for neutralizing the resulting polyurethane, preferably containing COOH groups, e.g. Trialkylamiiie with 1 to 12, preferably 1 to 6 carbon atoms in each alkyl radical. Examples include trimethylamine, triethylamine, methyldiethylamine, tripropylamine.
• the alkyl radicals can, for example, also carry hydroxyl groups, as in the case of the dialkylmonoalkanol, alkyldialkanol and triallcanolamines. An example of this is dimethylethanolamine, which preferably serves as a neutralizing agent.
• inorganic bases such as ammonium or sodium hydroxide or potassium hydroxide may also be used as neutralizing agents.
• the neutralizing agent is usually used in amounts such that the ratio of the substance close of amine groups or hydroxyl ions formed in aqueous solution to the amount of acid groups of the prepolymer is approximately 0.3: 1 to 1.3: 1, preferably approximately 0.5 : 1 to 1: 1.
• the neutralization which generally takes place between room temperature and 110 ° C., can be carried out in any manner, for example in such a way that the water-containing neutralizing agent is added to the polyurethane or vice versa.
• the neutralizing agent is first added to the polyurethane resin and only then the water, hn in general, a solids mass fraction in the dispersion of 20% to 70%, preferably 30% to 50%, is obtained in this way.
• Coating compositions which contain the water-dispersible polyurethane dispersions according to the invention as binders lead to soft-feel coatings which, compared to the known coatings in which polyester-polyols are used as building blocks for the polyurethanes, have considerably improved properties and in particular do not have any sticky properties Surfaces.
• the advantageous properties are independent of the coated substrate, as confirmed by tests on metals, plastics, wood and mineral substrates such as stone and concrete.
• Example 2 In accordance with the procedure in Example 1, 600 g of diethylene glycol, 1257 g of 1,6-hexanediol and 48 g of trimethylolpropane were initially introduced, with the same amounts of catalyst and dimethyl carbonate giving 2255 g of a polycarbonate polyol with a PlydroxylzaM of 170 mg / g.
• Example 3 Polyurethane Dispersion 1,935 g of the polycarbonate diol PCI from Example 1, 20 g of trimethylolpropane and 73 g of diethylolpropionic acid were placed in a reaction vessel and heated to 120 ° C. until a clear solution had resulted. 260 g of hexamethylene diisocyanate were metered in submerged at this temperature with cooling during about 90 minutes. After stirring for one hour, the mixture was cooled to 95 ° C. and a mixture of 39 g of dimethylethanolamine and 39 g of fully demineralized water was stirred in over the course of 15 minutes.
• Example 5 Polyurethane Dispersion 3 (Chain Extended)
• Example 5J Polyurethane Dispersion 91 g of dietlianolamine, 2265 g of water and 39 g
• Example 5 The procedure from Example 5 was repeated, 935 g of the polycarbonate diol PCI from Example 1, 20 g of trimethylolpropane and 73 g of dimethylolpropionic acid being introduced. After adding 417 g of hexamethylene diisocyanate, the reaction was continued until the
• Mass fraction of free isocyanate groups had dropped to about 2.8%.
• the prepolymer was mixed with a mixture of 39 g dimethylamine ethanol and 1000 g
• a two-component varnish (varnish A) was produced with the following formulation, the sub-steps identified by a Roman Za being carried out one after the other:
• Part I For the preparation of the paint, Part I was submitted and mixed well. The components of Part II were then added and the mixture was mixed on one for twenty minutes
• the mixture of parts I to III had a solids mass fraction of approx. 50%, the paint produced (parts I to TV) had a viscosity measured as the outflow time from a cup
• the pigment / binder ratio (mass of the pigment divided by the mass of the solids content of the binder) was 0.2: 1.
• the pot life of the ready-mixed paint was at room temperature (23 ° C.) in an open vessel about four hours.
• a comparative lacquer (lacquer V) was produced in the same way, except that the dispersion from example 7 was used.
• Example 3 The two polyurethane dispersions from Examples 3 and 7 (comparison) were stored at 40 ° C. for 4 weeks. The acid count was titrated weekly and the viscosity measured. The dispersion of Example 3 according to the invention remained unchanged. In the case of the dispersion of comparative example 7, the acid concentration increased significantly and the viscosity decreased by more than 3 powers of ten.
• FIGS. 1 and 2 show the time course of the viscosity and the acid number of the polyurethane dispersion according to Example 3 when stored at a temperature of 40 ° C. 2 are the course of the
• Viscosity of the dispersion and the acid number for the polyurethane dispersion of the comparative example (example 7) are shown.

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• Organic Chemistry (AREA)
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• Polymers & Plastics (AREA)
• Medicinal Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
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• Polyurethanes Or Polyureas (AREA)
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