Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
• • 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
  • C09D7/00—Features of coating compositions, not provided for in group C09D5/00; Processes for incorporating ingredients in coating compositions
• • 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
  • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
  • C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
• • 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
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
• • 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
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6633—Compounds of group C08G18/42
  • C08G18/6659—Compounds of group C08G18/42 with compounds of group C08G18/34
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J3/00—Processes of treating or compounding macromolecular substances
  • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
  • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L75/00—Compositions of polyureas or polyurethanes; Compositions of derivatives of such polymers
  • C08L75/04—Polyurethanes
  • C08L75/06—Polyurethanes from polyesters
• • 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

Definitions

• the present invention relates to an aqueous polyester-polyurethane dispersion comprising a polyester resin as the reaction product of a polyester polyol, dimethylol butyric acid and a HDI based polyisocyanate.
• the invention further relates to a process for the production of these polyesters and to their use.
• water-based binders which have a relatively high solids content and contain little or no organic auxiliary solvent can be produced by using internal or external nonionic emulsifiers. Since these emulsifiers remain in the film even after curing, they can adversely affect the properties of the coatings, including their resistance to water, detergents and weathering.
• Another problem of nonionic emulsions of the type in question is their generally poor stability, for example, to shear stressing during the production of lacquers, such that they tend to coagulate. In addition, it is not possible to obtain high-gloss coatings from these products.
• the water-dilutability of polymers can also be obtained by chemically incorporated, base- neutralized acid groups, more particularly carboxyl groups, or by chemically incorporated acid- neutralized tertiary amino groups.
• base- neutralized acid groups more particularly carboxyl groups
• acid- neutralized tertiary amino groups chemically incorporated acid- neutralized tertiary amino groups.
• the films become insoluble in water through dissociation of the hydrophilic salt groups and evaporation of the volatile neutralizing agents.
• large quantities of neutralizing agent may remain in the film.
• hydrophilic salt groups represent potential points of attack, for example for moisture, such that the quality of the coatings can be adversely affected.
• evaporation of an amine in relatively large quantities results in environmental concerns, especially when relatively large quantities of volatile, organic auxiliary solvents are also used.
• a water-based coating composition which contain very little organic solvent and, in addition, only require a small quantity of volatile neutralizing agents.
• a water-based coating composition is expected to have a high solids content in water. This is desirable for energy-saving reasons, for example, reduced transport costs and a relatively low heat demand for evaporating the water during the curing of the binders.
• more favorable application or film properties, including greater layer thicknesses, can be obtained. Dry film thicknesses of 50 to 70 ⁇ are generally difficult to achieve with water-based binders because there is a pronounced tendency towards the formation of boiling -induced bubbles, craters and other film defects.
• Highly flexible coatings find use in many fields of application, for example, in industrial coatings, in automotive non-chip coatings and fillers, for crack-covering coatings, etc.
• Newly developed binders should enable highly flexible coatings to be produced, whether in combination with cross- linking resins or as a flexibilizing additive to existing binder compositions having insufficient flexibility.
• US 5,280,062 describes to aqueous polyesters for high-solids stoving coatings which contain a) 35,0 to 65,0% by weight of a polyester resin containing urethane, carboxyl and hydroxyl groups and containing the reaction product of 77 to 89% by weight of a branched polyester polyol having a hydroxyl number of 125 to 175, an acid number of less than 4 and a molecular weight of 2500 to 6500, 2) 2,5 to 4,5% by weight of a 2,2-bis-(hydroxymethyl)alkane carboxylic acid, 3) 0 to 3,5% by weight of a diol component having a molecular weight of 62 to 250 and 4) 9 to 19% by weight of a diisocyanate component, wherein the percentages of al), a2), a3) and a4) add up to 100%, based on the weight of al), a2), a3) and a4), b) 0, 1 to 1,5% by weight of a basic neutralizing
• At least some aqueous polyesters that are described in US 5,280,062 still require the use of an organic auxiliary solvent, in particular N-methyl-2-pyrrolidone (NMP).
• NMP N-methyl-2-pyrrolidone
• auxiliary use of organic solvents is given in US 2004/204559 Al which relates to solvent-borne polyurethane resins with a high carbonate group content that are dilutable in water, to aqueous coating compositions prepared thereof, to a process for preparing them and to their use.
• the water-dilutable polyurethane resin is obtained by reacting at least one polycarbonate polyol with a number average molecular weight of from 400 to 6000 g/mole with at least one compound containing at least two isocyanate-reactive groups and at least one group capable of forming anions and one or more polyisocyanates.
• Optional reaction components are a polyester polyol which is different from the aforementioned polyol with a number-average molecular weight of 400 to 6000 g/mol, a low molecular weight compound containing two or more hydroxy and/or amino groups having a molecular weight of 60 to 400 g/mole and a compound which is monofunctional in terms of reaction with isocyanate groups or which contains active hydrogen atoms differing in reactivity, these units being located at the end of the polymer chain.
• the present invention therefore has the object of providing an aqueous polyester-polyurethane dispersion which can be dispersed in water having a solids content high enough for practical use without the presence of organic auxiliary solvents.
• an aqueous polyester-polyurethane dispersion comprising: a) a polyester resin comprising carboxyl and hydroxyl groups and which comprises the reaction product of: aa) a polyester polyol comprising the reaction product of: aal) at least one diol; aa2) at least one triol; aa3) at least one dicarboxylic acid and/or tricarboxylic acid and/or their anhydrides, the dicarboxylic acid not being succinic acid; aa4) succinic acid; bb) dimethylol butyric acid; cc) a polyisocyanate component comprising > 50 mole-% hexamethylene diisocyanate; a basic neutralizing agent; and c) water.
• the dispersions can be used as binders in 2 component PUR systems.
• the viscosity of the dispersions at 23 °C is preferably from > 10 mPa s to ⁇ 30000 mPa s, more preferred from > 50 mPa s to ⁇ 10000 mPa s and most preferred from > 500 mPa s to ⁇ 8000 mPa s.
• the pH value (ISO 976) of the dispersions is preferably from > 5 to ⁇ 10 and more preferred from > 6 to ⁇ 9 and the solids content is preferably > 30 weight-% to ⁇ 65 weight-%, preferably > 33 weight-% to ⁇ 48 weight-%.
• diisocyanate components which may be present besides hexamethylene diisocyanate include l-isocyanato-3,3,5-trimethyl-5- isocyanatomethyl cyclohexane (isophorone diisocyanate or IPDI), perhydro-2,4'- and -4,4'-diphenyl methane diisocyanate and 2,4- and 2,6-toluene diisocyanate.
• IPDI isophorone diisocyanate
• IPDI isophorone diisocyanate
• perhydro-2,4'- and -4,4'-diphenyl methane diisocyanate perhydro-2,4'- and -4,4'-diphenyl methane diisocyanate and 2,4- and 2,6-toluene diisocyanate.
• 100 mole-% of component cc) is hexamethylene diisocyanate, particularly 1,6-hexamethylene diisocyan
• the branched polyester polyols aa) may be obtained in a known manner from the above-mentioned starting materials.
• the reaction may take place in the presence of known esterification catalysts, preferably in the melt or with azeotropic condensation at a temperature of 140 °C to 240 °C with the elimination of water.
• the reaction may be conducted under vacuum.
• the entraining agent e.g., isooctane, xylene, toluene or cyclohexane
• the entraining agent e.g., isooctane, xylene, toluene or cyclohexane
• Examples for the at least one diol aal) include ethylene glycol, 1,2- and 1,3-propylene glycol, 1,3-, 1,4- and 2,3-butane diol, 1,6-hexane diol, 2,5-hexane diol, trimethylhexane diol, diethylene glycol, triethylene glycol, hydrogenated bisphenols, 1,4-cyclohexane diol, 1,4-cyclohexane dimethanol, neopentyl glycol and/or trimethylpentane diol.
• Examples for the at least one triol aa2) include trimethylol propane and/or glycerol.
• Examples for at least one dicarboxylic acid and/or tricarboxylic acid and/or their anhydrides aa3) include phthalic acid, phthalic acid anhydride, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, tetrahydrophthalic acid anhydride, hexahydrophthalic acid, hexahydrophthalic acid anhydride, maleic acid, maleic acid anhydride, fumaric acid, adipic acid, sebacic acid, azelaic acid and/or benzenetricarboxylic acid.
• Suitable basic neutralizing agents b) include ammonia, triethyl amine, triethanolamine, dimethyl ethanolamine, monoethanolamine, diethanolamine, N-methyldiethanol amine, morpholine, N- methyl morpholine, 2-amino-2-methyl-l-propanol and mixtures of these bases .
• Dimethyl ethanolamine, N-methyl morpholine, methyl diethanol amine and ammonia are preferred.
• Alkali metal hydroxides, such as sodium or potassium hydroxide, may also be used, but are less preferred.
• the polyester polyol aa comprises the reaction product of: aal) 1,6-hexane diol, neopentyl glycol and/or 1,4-cyclohexane dimethanol; aa2) trimethylol propane and/or glycerol; aa3) isophthalic acid, phthalic anhydride and/or hexahydrophthalic anhydride; aa4) succinic acid.
• the dispersion does not comprise an organic auxiliary solvent.
• organic auxiliary solvent examples include acetone and N-methyl-2-pyrrolidone.
• the polyester resin a) has an acid number of ⁇ 22, a hydroxyl number of > 40 mg KOH/g to ⁇ 110 mg KOH/g, a weight average molecular weight M w of > 8000 g/mole to ⁇ 50000 g/mole and a urethane group content (-NH-C(O)-O-) of > 6,5 weight-% to ⁇ 11 weight-%.
• the acid number (given in mg KOH/g) of the polyester resin a) may be determined according to DIN 3682. Preferably, the acid number is ⁇ 20.
• the hydroxyl number (OH number) may be determined according to DIN 53240 part 2. Preferably, the hydroxyl number is > 60 mg KOH/g to ⁇ 10 mg KOH/g.
• the weight average molecular weight of polyester resin a) may be determined according to DIN 55672/1 or DIN 55672/2 and is preferably > 10000 g/mole to ⁇ 29000 g/mole
• the urethane group content is preferably > 7 weight-% to ⁇ 10,3 weight-% and more preferred > 7,0 weight-% to ⁇ 8,5 weight-%.
• the polyester polyol aa) is a branched polyester polyol with an acid number of ⁇ 4, a hydroxyl number of > 125 mg KOH/g to ⁇ 175 mg KOH/g and a weight average molecular weight M w of > 2500 g/mole to ⁇ 6500 g/mole.
• the acid number (given in mg KOH/g) of the polyester polyol aa) may be determined according to DIN 3682.
• the acid number is ⁇ 2,2.
• the hydroxyl number (OH number) may be determined according to DIN 53240 part 2.
• the hydroxyl number is > 140 mg KOH/g to ⁇ 165 mg KOH/g.
• the weight average molecular weight of polyester polyol aa) may be determined according to DIN 55672/1 or DIN 55672/2 and is preferably > 3500 g/mole to ⁇ 5000 g/mole.
• the components a), b) and c) are present in the following amounts, the percentages of a), b) and c) adding up to ⁇ 100 weight-%, based on the weight of a), b) and c): a) > 35 weight-% to ⁇ 65 weight-%, preferably > 40 weight-% to ⁇ 50 weight-%; b) > 0, 1 weight-% to ⁇ 1,5 weight-%, preferably > 0,5 weight-% to ⁇ 1 weight-%; c) > 26 weight-% to ⁇ 64,9 weight-%, preferably > 50 weight-% to ⁇ 59,5 weight-%.
• the components aa), bb) and cc) are present in the following amounts, the percentages of aa), bb) and cc) adding up to ⁇ 100 weight-%, based on the weight of aa), bb) and cc): aa) > 77 weight-% to ⁇ 89 weight-%, preferably > 80 weight-% to ⁇ 86 weight-%; bb) > 2,5 weight-% to ⁇ 4,5 weight-%, preferably > 4 weight-% to ⁇ 4,4 weight-%; cc) > 9 weight-% to ⁇ 19 weight-%, preferably > 10 weight-% to ⁇ 14 weight-%.
• the components aal), aa2), aa3) and aa4) are present in the following amounts, the percentages of aal), aa2), aa3 and aa4) adding up to ⁇ 100 mole-%, based on aal), aa2), aa3) and aa4): aal) > 40 mole-% to ⁇ 48 mole-%, preferably > 42 mole-% to ⁇ 46 mole-%; aa2) > 8 mole-% to ⁇ 16 mole-%, preferably > 12 mole-% to ⁇ 14 mole-%; aa3) > 26 mole-% to ⁇ 39 mole-%, preferably > 32 mole-% to ⁇ 36 mole-%;
• Another aspect of the present invention is a method for the production of a dispersion according to the invention comprising the step of reacting the polyester polyol aa), dimethylol butyric acid bb) and the polyisocyanate component cc) in the presence of a urethanization catalyst, followed by the steps of adding the basic neutralizing agent b) and adding water c).
• the polyester resin a) may be produced by mixing the polyester polyol, dimethylol butyric acid and polyisocyanate and then heating the reaction mixture until no more NCO groups are present.
• the reaction is carried out in the presence of suitable catalysts, e.g., dibutyl tin oxide, tin (II)- octoate, tin(II)-ethylhexanoate, dibutyl tin dilaurate or tertiary amines such as triethyl amine, which are generally added in quantities of 0,005 to 1% by weight, based on the weight of the reaction mixture as a whole.
• the reaction may also be carried out under pressure at relatively high temperatures.
• the reaction may be carried out without using solvents or in inert solvents, such as acetone or methyl ethyl ketone, at solids contents of 40 to 96% by weight.
• the basic neutralizing agent b) may be added in a quantity of 0,1 to 1,5% by weight, preferably 0,5 to 1% by weight, based on the weight of the aqueous polyester.
• Suitable basic neutralizing agents b) include ammonia, triethyl amine, triethanolamine, dimethyl ethanolamine, monoethanolamine, triisopropyl amine, diethanolamine, N-methyldiethanol amine, morpholine, N-methyl morpholine, 2-amino-2-methyl-l-propanol and mixtures of these bases. Dimethyl ethanolamine, N-methyl morpholine, methyl diethanol amine and ammonia are preferred. Alkali metal hydroxides, such as sodium or potassium hydroxide, may also be used, but are less preferred.
• a neutralizing agent need not be added when a tertiary amine, such as triethyl amine, has been used as the catalyst for the isocyanate addition reaction, because this catalyst can also act as a neutralizing agent, provided that it is used in the proper quantity.
• Water (preferably deionized) as component c), is added to the polyester resin to form the aqueous polyester dispersion.
• the organic solvent may be partly or completely distilled off, optionally under vacuum.
• the quantity of water used is preferably selected so that the resulting aqueous polyester has a solids content of > 30 weight-% to ⁇ 65 weight-%, preferably of > 33 weight-% to ⁇ 48 weight-%.
• the water used may also be partly distilled off to obtain as high a solids content as possible.
• the production is undertaken in the absence of an organic co-solvent. Specific examples of such substances that are not used in production include acetone and N-methyl-2-pyrrolidone.
• the present invention further relates to the use of a dispersion according to the invention for the manufacture of two-component coating binders.
• the coating binder does not comprise an organic auxiliary solvent.
• organic auxiliary solvent examples include acetone and N-methyl-2-pyrrolidone.
• a further aspect of the present invention is an aqueous stoving lacquer having a solids content of > 50 weight-% and comprising:
• stoving lacquers include stoving filler coatings and wet-on-wet non-chip primers of the type used in automotive coatings.
• the coatings according to the invention may also be used for coating plastic, film, metal, wood and mineral substrates. They are also suitable as high-solids one-coat finishing coatings on optionally pretreated substrates.
• the stoving coatings according to the invention may contain the auxiliaries and additives known from lacquer technology as further described below and may be applied to the substrate to be coated by methods known per se, such as spray coating, flood coating, casting, dip coating, roll coating, spread coating.
• the stoving lacquers according to the invention possess prolonged stability in storage both at room temperature and at moderately elevated temperatures of up to 50 °C and may be cured at temperatures above 100 °C, preferably at temperatures above 110 °C, to form cross-linked films having excellent properties.
• the dispersion A) according to the invention may be combined with water-dilutable or water- dispersible OH-reactive cross-linking agents.
• hydrophobic substances which are not dispersible in water on their own may also be used as the cross-linking resins because the polyester binders containing hydroxyl and carboxylate groups can perform the function of an emulsifier for the cross-linking resins.
• Suitable cross-linking resins B) include melamine-formaldehyde or urea-formaldehyde condensates of the type described, for example, in D. H. Solomon, The Chemistry of Organic Filmformers, pages 235 et seq., John Wiley & Sons, Inc., New York, 1967.
• the melamine resins may also be completely or partly replaced by other crosslinking amino resins of the type described, for example, in "Methoden der organischen Chemie” (Houben-Weyl), Vol. 14/2, Part 2, 4th Edition, Georg Thieme Verlag, Stuttgart 1963, pages 319 et seq.
• cross-linking resins are blocked polyisocyanates based on, for example, isophorone diisocyanate, hexamethylene diisocyanate, 1,4-diisocyanatocyclohexane, bis-(4- isocyanatocyclohexyl) -methane, 1,3-diisocyanatobenzene, 1,4-diisocyanatobenzene, 2,4- diisocyanato-1 -methyl benzene, l,3-diisocyanato-2-methyl benzene, 1,3-bis-isocyanatomethyl benzene, 2,4-bis-isocyanatomethyl-l,5-dimethyl benzene, bis-(4-isocyanatophenyl)-propane, tris- (4-isocyanatophenyl)methane and trimethyl- 1 ,6-diisocyanatohexane.
• blocked polyisocyanates adducts such as biuret polyisocyanates based on 1,6- diisocyanatohexane; isocyanurate polyisocyanates based on 1,6-diisocyanatohexane; or urethane- modified polyisocyanate adducts prepared from 2,4-and/or 2,6-diisocyanatotoluene or isophorone diisocyanate and low molecular weight polyhydroxyl compounds (such as trimethylol propane, the isomeric propane diols or butane diols or mixtures of such polyhydroxyl compounds), wherein the isocyanate groups of the polyisocyanate adduct are blocked.
• blocked polyisocyanates adducts such as biuret polyisocyanates based on 1,6- diisocyanatohexane; isocyanurate polyisocyanates based on 1,6-diisocyanatohexane; or
• Suitable blocking agents for these polyisocyanates include monohydric alcohols such as methanol, ethanol, butanol, hexanol and benzyl alcohol; oximes such as acetoxime and methyl ethyl ketoxime; lactams such as .epsilon.-caprolactam; phenols; and CH-acidic compounds such as diethyl malonate.
• the optional auxiliaries and additives C) include pigments (such as titanium dioxide, iron oxide, lead oxide and zinc oxide), fillers (such as alkaline earth metal silicates, carbon black, which may also act as a filler, talcum and graphite), organic dyes, flow control agents, foam inhibitors, UV absorbers, anti-sedimenting agents, thickeners, wetting agents, antioxidants, anti-skinning agents and cross-linking catalysts.
• component A) may be present in combination with other hydroxy-functional polymers D) in an amount, based on solids, of up to 400% by weight of the quantity of component a) present in component A).
• the amount of component B), based on solids preferably is 5 to 50% by weight, based on the weight of component a) present in component A) and component D).
• hydroxy-functional polymers D examples include those described in DE-OS No. 2,528,212, DE-OS 2,556,621 and EP-A No. 0,218,906.
• the stoving lacquer does not comprise an organic auxiliary solvent.
• Specific examples of such substances that are not part of the stoving lacquer include acetone and N-methyl-2-pyrrolidone.
• the hydroxy-reactive cross-linking resin comprises one or more water-dilutable or water-dispersible melamine- formaldehyde condensate.
• Preferred cross-linking resins are melamine and urea resins, more preferably alkylated melamine/ formaldehyde resins containing 1 to 8 carbon atoms in the alkyl chain, such as butylated, methylated and/or methoxymethylated melamine resins.
• a polyester was prepared with the following components:
• the components were introduced into a reaction vessel with a distillation column attached and heated to 140 °C over the course of one hour under a nitrogen atmosphere (5-6 1 N2) . After having reached 140 °C the temperature was raised to 170 °C over three hours (10 °C/h) and subsequently to 220 °C over ten hours (5 °C/h). The temperature was kept at 220 °C until an acid number of ⁇ 2,5 was observed in the reaction mixture.
• Example 2 A polyester-polyurethane dispersion as of the convention was prepared with the following components: Amount [g] Weight-%
• Polyester I according to example 1 1270.0 84.67
• part I The components of part I were introduced into a reaction vessel, heated to 130 °C and kept at this temperature for 30 minutes. The mixture was then cooled to 80 °C and HDI (part II) was added. The subsequent reaction was carried out at 130 °C for 2 hours. After another cooling to 80 °C DMEA (part III) was added and the mixture was stirred for 30 minutes. Finally, water (part IV) was added and the mixture was stirred at 70 °C for 2 hours.

Landscapes

• Chemical & Material Sciences (AREA)
• Organic Chemistry (AREA)
• Health & Medical Sciences (AREA)
• Polymers & Plastics (AREA)
• Medicinal Chemistry (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Engineering & Computer Science (AREA)
• Materials Engineering (AREA)
• Wood Science & Technology (AREA)
• Life Sciences & Earth Sciences (AREA)
• Manufacturing & Machinery (AREA)
• Dispersion Chemistry (AREA)
• Polyurethanes Or Polyureas (AREA)
• Paints Or Removers (AREA)

Priority Applications (5)

Applications Claiming Priority (2)

Publications (1)

Family

ID=44121739

Family Applications (1)

Country Status (6)

Cited By (3)

Families Citing this family (9)

Citations (7)

Family Cites Families (7)

• 2012
  • 2012-03-20 WO PCT/EP2012/054915 patent/WO2012126911A1/en not_active Ceased
  • 2012-03-20 JP JP2014500353A patent/JP2014510175A/ja active Pending
  • 2012-03-20 EP EP12710700.1A patent/EP2688930B1/en not_active Not-in-force
  • 2012-03-20 US US14/005,847 patent/US20140066569A1/en not_active Abandoned
  • 2012-03-20 KR KR1020137024246A patent/KR20140005283A/ko not_active Withdrawn
  • 2012-03-20 CN CN201280014309.5A patent/CN103547604B/zh not_active Expired - Fee Related

Patent Citations (7)

Non-Patent Citations (2)

Also Published As

Similar Documents

Legal Events