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
  • 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
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction 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
  • C08G18/2805—Compounds having only one group containing active hydrogen
  • C08G18/2815—Monohydroxy compounds
  • C08G18/282—Alkanols, cycloalkanols or arylalkanols including terpenealcohols
• • 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3203—Polyhydroxy compounds
  • C08G18/3206—Polyhydroxy compounds aliphatic
• • 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3203—Polyhydroxy compounds
  • C08G18/3212—Polyhydroxy compounds containing cycloaliphatic 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
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3225—Polyamines
  • C08G18/3228—Polyamines acyclic
• • 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3271—Hydroxyamines
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/62—Polymers of compounds having carbon-to-carbon double bonds
  • C08G18/6216—Polymers of alpha-beta ethylenically unsaturated carboxylic acids or of derivatives thereof
  • C08G18/625—Polymers of alpha-beta ethylenically unsaturated carboxylic acids; hydrolyzed polymers of esters of these acids
  • C08G18/6254—Polymers of alpha-beta ethylenically unsaturated carboxylic acids and of esters of these acids containing hydroxy groups
• • 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
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/721—Two or more polyisocyanates not provided for in one single group C08G18/73 - C08G18/80
  • C08G18/722—Combination of two or more aliphatic and/or cycloaliphatic polyisocyanates
• • 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
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
  • C08G18/751—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring
  • C08G18/752—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group
  • C08G18/753—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group
  • C08G18/755—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing only one cycloaliphatic ring containing at least one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group containing one isocyanate or isothiocyanate group linked to the cycloaliphatic ring by means of an aliphatic group having a primary carbon atom next to the isocyanate or isothiocyanate group and at least one isocyanate or isothiocyanate group linked to a secondary carbon atom of the cycloaliphatic ring, e.g. isophorone diisocyanate
• • 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
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
  • C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
• • 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
• • 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
  • Y10T428/31504—Composite [nonstructural laminate]
  • Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]

Definitions

• the present invention relates to novel, cycloaliphatic structural elements containing polyisocyanate mixtures with exclusively linear aliphatic bound free isocyanate groups, a process for their preparation and their use as starting material in the production of polyurethane plastics, in particular as crosslinking component in polyurethane coatings and
• Two-component polyurethane coatings (2K-PUR) have gained importance for a wide variety of applications due to their outstanding technological properties.
• Polyisocyanates based on linear aliphatic or cycloaliphatic diisocyanates are generally used as crosslinking components for light-stable, non-yellowing 2-component PUR coatings and coatings.
• HDI 1,6-diisocyanatohexane
• HDI polyisocyanates for example, highly functional HDI trimers, which are often recommended as crosslinking to formulate fast-drying 2K-PUR coatings (see, eg. As product Tolonate ® XFD 90 B, Rhodia PCS).
• crosslinkers although the drying rate over standard crosslinkers can be increased, a higher final hardness of the paint films is not achieved.
• HDI polyisocyanates are therefore frequently used in combination with corresponding cycloaliphatic polyisocyanates, for example those based on IPDI (see, for example, Meier- Westhues, Polyurethanes - Paints, Adhesives and Sealants, Vincentz Network 2007, p. 166). In this way, the drying of the paint films and in particular the hardness development can be significantly accelerated.
• cycloaliphatic poly isocyanates due to the lower reactivity of their isocyanate but temperatures in the range of 100 0 C or above. At room temperature or slightly forced drying (about 60 0 C) is quickly obtained, although dry to the touch, hard Lackf ⁇ lme, but which have a lower solvent and chemical resistance than exclusively with HDI polyisocyanates crosslinked have coatings.
• the object of the present invention was therefore to provide novel polyisocyanates which are suitable for all fields of application of aliphatic polyisocyanates, in particular as crosslinker components for 2K polyurethane coatings, and which do not suffer from the disadvantages of the prior art.
• These new polyisocyanate crosslinkers should enable the formulation of fast-drying coating systems that cure at the same time even at low temperatures to hard, solvent- and chemical-resistant coatings.
• the invention relates to a process for the preparation of polyisocyanate mixtures containing cycloaliphatic structural elements and linear aliphatic bound free isocyanate groups, in which
• A) a polyisocyanate component having an average functionality of from 2.0 to 5.0, containing from 8.0 to 27.0% by weight of linear aliphatically bound isocyanate groups (calculated as NCO, molecular weight 42)
• the invention further provides the polyisocyanate mixtures obtainable in this way and the use of the products obtainable by this process as starting components in the production of polyurethane plastics, in particular as crosslinking component in polyurethane coatings and coatings.
• linear-aliphatic and cycloaliphatic bound isocyanate groups these terms referring to the chemical structure of the diisocyanates used according to the invention or polyisocyanates prepared therefrom.
• linear aliphatic diisocyanates are meant those compounds which are completely free of cyclic structural elements, whereas in the case of the "cycloaliphatic” diisocyanates, at least one isocyanate group is bound to be bound to a cycloaliphatic ring.
• the polyisocyanate component A) to be used in the process according to the invention generally has an (average) NCO functionality of from 2.0 to 5.0, preferably from 2.3 to 4.5, a content of isocyanate groups of from 8.0 to 27.0 Wt .-%, preferably 14.0 to 24.0 wt .-% and a content of monomeric diisocyanates of less than 1 wt .-%, preferably less than 0.5 wt .-% to.
• They comprise at least one organic, exclusively linear aliphatic bound isocyanate group-containing polyisocyanate.
• the polyisocyanates of component A) are any polyisocyanates prepared by modifying simple linear aliphatic diisocyanates and composed of at least two diisocyanates with uretdione, isocyanurate, allophanate, biuret, iminooxadiazinedione and / or oxadiazinetrione structures, as they are for example in J. Prakt. Chem. 336 (1994) 185-200, in DE-A 1 670 666 and EP-A 0 798 299 are described by way of example.
• Suitable diisocyanates for preparing such polyisocyanates are any linearaliphatic diisocyanates obtainable by phosgenation or by phosgene-free processes, for example by thermal urethane cleavage, ie those which have no cycloaliphatic structures.
• Preferred linear aliphatic diisocyanates are those of the molecular weight range from 140 to 336 g / mol, such as 1,4-diisocyanatobutane, 1,6-diisocyanatohexane (HDI), 2-methyl-1,5-diisocyanato-pentane, 1,5-diisocyanato-2,2-diene. dimethylpentane, 2,2,4- or 2,4,4-trimethyl-l, 6-diisocyanato-hexane, 1,10-diisocyanatodecane, or any mixtures of such diisocyanates.
• 1,4-diisocyanatobutane 1,
• exclusively polyisocyanates with linear aliphatic bound isocyanate groups are preferably used, so that the polyisocyanate mixtures obtainable by the process according to the invention have exclusively linear aliphatically bound isocyanate groups.
• the polyisocyanates used in A) are preferably those of the aforementioned type with uretdione, isocyanurate, allophanate, biuret and / or iminooxadiazinedione structure based on HDI.
• HDI polyisocyanates having an isocyanurate structure and / or iminooxadiazinedione structure as starting components.
• the component B) to be used in the process according to the invention comprises at least one isocyanate-group-free, optionally urea group-containing hydroxyurethane having an average molecular weight of from 260 to 8000 g / mol, preferably from 275 to 6000 g / mol, more preferably from .alpha.-based on a cycloaliphatic diisocyanate and / or polyisocyanate 290 to 5000 g / mol, which has an average OH functionality of 1.0 to 6.0, preferably from 1.5 to 4.0, particularly preferably from 2.0 to 3.2.
• Suitable cycloaliphatic diisocyanates for preparing the hydroxyurethanes B) are, for example, those of the molecular weight range from 166 to 318 g / mol, such as 1,3- or 1,4-diisocyanatocyclohexane, 1,4-diisocyanato-3,3,5-trimethylcyclohexane, 1, 3-diisocyanato-2 (4) -methylcyclohexane, 1-isocyanato-3,3,5-trimethyl-5-isocyanatomethylcyclohexane (isophorone diisocyanate,
• IPDI 1-isocyanato-1-methyl-4 (3) isocyanato-methylcyclohexane, 1,8-diisocyanato-p-menthane, 4,4'-diisocyanato-1,4'-bi (cyclohexyl), 4,4 '.
• polyisocyanates obtainable from these cycloaliphatic diisocyanates, in particular those having an isocyanurate, biuret, uretdione and / or allophanate structure, as described, for example, in J. Prakt. Chem. 336 (1994) 185-200 and EP-A 0 649 866 are described by way of example.
• Preferred cycloaliphatic isocyanate components for preparing the hydroxyurethanes B) are IPDI, 1,3-diisocyanato-2 (4) -methylcyclohexane, 4,4'- and / or 2,4'-diisocyanatodicyclohexylmethane, and also polyisocyanates based on these diisocyanates.
• the said cycloaliphatic di- and / or polyisocyanates are reacted with a molar excess of suitable hydroxy-functional compounds, preferably those of the molecular weight range from 32 to 300 g / mol.
• Suitable hydroxy-functional compounds are, for example, low molecular weight polyhydric aliphatic and cycloaliphatic alcohols, such as. B. 1,2-ethanediol, 1,2- and 1, 3-propanediol, the isomeric butanediols, pentanediols, hexanediols, heptanediols and octanediols, 1,2- and 1,4-cyclohexanediol, 1, 4-cyclohexanedimethanol, 4,4 '- (1-methylethylidene) biscyclohexanol, 1,2,3-propanetriol, 1,1,1-trimethylolethane, 1, 2,6-hexanetriol, 1,1,1-trimethylolpropane, 2,2 bis (hydroxymethyl) -
• ether alcohols such as.
• suitable hydroxy-functional compounds are also simple amino alcohols, such as.
• hydroxyurethanes B for example, to set a defined OH functionality or to achieve specific properties, but also monovalent structural components can be used, for example, simple alcohols, such as.
• monofunctional ester alcohols such as butyl glycolate and ethyl lactate, monofunctional dialkylamino alcohols, such as.
• 2-methoxyethylamine 3-methoxypropylamine, dimethylamine, diethylamine, dipropylamine, diisopropylamine, dibutylamine, diisobutylamine, bis (2-ethylhexyl) amine, N-methyl- and N-ethylcyclohexylamine or dicyclohexylamine.
• the above-mentioned hydroxy-, mercapto- and / or amino-functional compounds can also be used in the form of any desired mixtures.
• reactants for the stated cycloaliphatic di- and / or polyisocyanates preference is given to using simple diols or amino alcohols of the type mentioned having a molecular weight of from 62 to 150 g / mol, if appropriate in combination with monoalcohols or monoamines of the type mentioned.
• the stated starting components are reacted with one another in quantities such that the resulting products have the abovementioned characteristics, ie. H. an average molecular weight of 260 to 8000 g / mol, preferably 275 to 6000 g / mol, more preferably 290 to 5000 g / mol, and an average OH functionality of 1.0 to 6.0, preferably 1.5 to 4.0, more preferably from 2.0 to 3.2.
• Hydroxyurethanes B are generally viscous to solid substances. Although they can in principle be used solvent-free in the process according to the invention, they are preferably used in a form dissolved with suitable solvents.
• Suitable solvents for this purpose are, for example, the customary isocyanate-inert lacquer solvents known from coating chemistry, such as, for example, Ethyl acetate, butyl acetate, ethylene glycol monomethyl or ethyl ether acetate, 1-methoxypropyl 2-acetate, 3-methoxy-n-butyl acetate, acetone, 2-butanone, 4-methyl-2-pentanone, cyclohexanone, toluene, xylene.
• coating chemistry such as, for example, Ethyl acetate, butyl acetate, ethylene glycol monomethyl or ethyl ether acetate, 1-methoxypropyl 2-acetate, 3-methoxy-n-butyl acetate, acetone, 2-butanone, 4-methyl-2-pentanone, cyclohexanone, toluene, xylene.
• Chlorobenzene white spirit, higher substituted aromatics, as described for example under the names Solventnaphtha, SoIvesso®, Isopar®, Nappar® (German EXXON CHEMICAL GmbH, Cologne, DE) and Shellsol® (Deutsche Shell Chemie GmbH, Eschborn, DE) in Trade but also solvents such as propylene glycol diacetate, diethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, diethylene glycol ethyl and butyl ether acetate, N-methylpyrrolidone and N-methylcaprolactam, or any mixtures of such solvents.
• solvents such as propylene glycol diacetate, diethylene glycol dimethyl ether, dipropylene glycol dimethyl ether, diethylene glycol ethyl and butyl ether acetate, N-methylpyrrolidone and N-methylcaprolactam, or any mixtures of such solvents.
• the implementation of the method according to the invention usually so that the poly-isocyanate component a) is preferably placed under an inert gas at a temperature of 20 to 150 0 C, preferably from 30 to 120 0 C and then stirring optionally in a solvent dissolved Hydroxyurethankomponente B) in an amount of 2 to 80 wt .-%, preferably from 4 to 60 wt .-%, particularly preferably from 6 to 50 wt .-%, based on the total amount of components A) and B) calculated on solvent-free form, is added.
• the preparation of the hydroxyurethanes B) and the reaction to the process products of the invention can be carried out uncatalyzed, but also the usual known from polyurethane chemistry urethanization catalysts can be used to accelerate the reaction, for example, tert.
• Amines such as triethylamine, pyridine, methylpyridine, benzyldimethylamine, N, N-endoethylenepiperazine, N-methylpiperidine, pentamethyldiethylenetriamine, N, N-dimethylaminocyclohexane, N, N'-dimethylpiperazine or metal salts such as iron (III) chloride, zinc chloride, zinc octoate, zinc 2-ethylcaproate, zinc acetylacetonate, stannous octoate, stannous ethylcaproate, stannous palmitate, dibutyltin (IV) dilaurate, zirconium (IV) 2-ethyl l-hexanoate, zirconium (IV) neodecanoate, zirconium (IV) naphthenate, zirconium (IV) acetylacetonate, aluminum tri (ethyl acetoacetate), bismuth (
• These catalysts are optionally used in amounts of 0.001 to 2.0 wt .-%, preferably 0.01 to 0.2 wt .-%, based on the total amount of the starting components A) and B) used.
• novel polyisocyanate mixtures containing cycloaliphatic structural elements according to the invention generally have, based on the solvent-free form, a content of linear aliphatically bound isocyanate groups of from 4.0 to 26.0% by weight, preferably from 6.0 to 23, 0 wt .-%, particularly preferably from 8.0 to 22.0 wt .-% and an average NCO functionality of 1.9 to 8.0, preferably from 2.0 to 6.0, particularly preferably from 2, 5 to 4.5.
• polyisocyanate mixtures according to the invention which contain cycloaliphatic structural elements and which preferably carry exclusively linear aliphatically bound isocyanate groups are valuable starting materials for the preparation of polyurethane plastics by the polyaddition process. They are outstandingly suitable as curing agents for two-component polyurethane coatings in which the usual polyether polyols, polyester polyols, polycarbonate polyols and / or polyacrylate polyols are present as polyhydroxyl compounds as reactants for the polyisocyanate mixtures. Particularly preferred reactants for the novel process products are hydroxyl-containing polyacrylates, ie polymers or copolymers of
• the formulated with the polyisocyanate mixtures according to the invention coating compositions which optionally have the usual in the paint sector auxiliaries and additives such.
• As flow control agents, color pigments, fillers or matting agents, can be incorporated, even at room temperature drying good paint properties.
• the polyisocyanate mixtures containing cycloaliphatic structural elements according to the invention thus combine the rapid drying and high final hardness of cycloaliphatic polyisocyanate crosslinkers with the rapid chemical curing and the resulting good resistances of linear aliphatic polyisocyanates.
• suitable catalysts for the formulation of the coating compositions may be, for example, the above-described urethanization catalysts customary in polyurethane chemistry.
• the polyisocyanate mixtures containing cycloaliphatic structural elements according to the invention can also be used in blocked form with blocking agents known from polyurethane chemistry in combination with the abovementioned lacquer binders or lacquer binder components in the sense of one-component PU stoving systems.
• Suitable blocking agents are, for example, diethyl malonate, acetoacetic ester, activated cyclic ketones, such as. B.
• the invention therefore also relates to the use of the polyisocyanate mixtures according to the invention for the preparation of polyisocyanates blocked with blocking agents known from polyurethane chemistry, as well as the resulting blocked polyisocyanates themselves.
• novel process products can also be reacted with polyamines, such as.
• polyamines such as.
• polyamines such as.
• polyamines such as.
• polyketimines, polyaldimines or oxazolanes combined. Free amino groups are formed from these blocked amino groups under the influence of moisture and, in the case of the oxazolanes, free hydroxyl groups which react by crosslinking with the isocyanate groups of the polyisocyanate mixtures according to the invention.
• polyisocyanate mixtures according to the invention are also suitable as crosslinking components for in
• the process products according to the invention and the reactants are present in amounts such that 0.5 to 3, preferably 0.6 to 2.0, particularly preferably 0.8 to 1.6, optionally blocked, are added to any optionally blocked isocyanate group. Isocyanate-reactive groups are eliminated.
• the polyisocyanate mixtures according to the invention can be mixed in minor amounts but also non-functional paint binders to achieve very specific properties, for example as an additive for improving the adhesion.
• substrates for the formulations formulated with the aid of the cycloaliphatic structural elements of the invention containing polyisocyanate mixtures come any substrates in
• compositions comprising the polyisocyanate mixtures according to the invention and those coated with these coating compositions
• Isocyanurate group-containing HDI polyisocyanate prepared by the process of EP-A 0 330 966.
• NCO content 21.6% monom.
• HDI 0.1% average NCO functionality: 3.4
• Viscosity 2500 mPas (23 ° C)
• Isocyanurate group-containing HDI polyisocyanate prepared by the process of EP-A 0 330 966.
• NCO content 23.0% monom.
• HDI 0.1% average NCO functionality: 3.1
• NCO content 23.5% monom.
• HDI 0.3% average NCO functionality: 3.1
• Viscosity 700 mPas (23 ° C)
• NCO content 22.9% monom.
• HDI 0.1% average NCO functionality: 2.2
• Viscosity 100 mPas (23 ° C)
• NCO content 11.8% monom.
• IPDI 0.3% average NCO functionality: 3.2
• Isocyanurate group-containing HDI polyisocyanate prepared by the process of EP-A 0 330 966.
• NCO content 17.8% monom.
• HDI 0.1% average NCO functionality: 4.1
• Viscosity 1800 mPas (23 ° C)
• Viscosity 800 mPas average NCO functionality: 3.6
• polyisocyanate mixtures containing cycloaliphatic structural elements were prepared using different polyisocyanate components A) and hydroxyurethanes B).
• the following table shows the compositions (in each case parts by weight) and characteristics of the products according to the invention.
• Example 10 (use, according to the invention and comparison)
• the solids content was also by addition of a total of 83.2 parts by weight (10 b) or 77.6 parts by weight of the above-described, consisting of equal proportions of butyl acetate, xylene and l-methoxypropyl-2-acetate solvent mixture also to 50 % set.
• the paints were applied in a wet film thickness of 100 .mu.m (about 50 .mu.m dry) on glass plates and after 15 minutes of drying both at room temperature and under forced conditions (30 min / 60 0 C) dried. In all cases, high-gloss transparent varnish was obtained.
• the following table shows a comparison of the coating technology properties of the coating formulations and of the coatings obtained:
• Trimerisate was crosslinked (Comparative Example 10 c), the coating obtained according to the invention is characterized in particular by a greatly improved chemical resistance (see gasoline resistance).
• Polyacrylate polyol prepared using different inventive polyisocyanate and maintaining an NCO / OH equivalent ratio of 1: 1 clearcoats, applied to glass plates and cured.
• the table below shows the compositions (in each case parts by weight) of the paint formulations produced and the coating properties of the resulting coatings.

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• 2008
  • 2008-12-09 US US12/315,980 patent/US7939598B2/en not_active Expired - Fee Related
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