Classifications

• • 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
  • C08K5/00—Use of organic ingredients
  • C08K5/16—Nitrogen-containing compounds
  • C08K5/32—Compounds containing nitrogen bound to oxygen
• • C—CHEMISTRY; METALLURGY
  • C07—ORGANIC CHEMISTRY
  • C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
  • C07C291/00—Compounds containing carbon and nitrogen and having functional groups not covered by groups C07C201/00 - C07C281/00
  • C07C291/02—Compounds containing carbon and nitrogen and having functional groups not covered by groups C07C201/00 - C07C281/00 containing nitrogen-oxide bonds
• • 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
  • C08K5/00—Use of organic ingredients
  • C08K5/0008—Organic ingredients according to more than one of the "one dot" groups of C08K5/01 - C08K5/59
  • C08K5/0025—Crosslinking or vulcanising agents; including accelerators
• • 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
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/03—Powdery paints
  • C09D5/033—Powdery paints characterised by the additives
• • 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
  • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
  • C09D5/34—Filling pastes
• • 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
  • C09D7/40—Additives
  • C09D7/42—Gloss-reducing agents

Definitions

• the invention relates to polynitrone and its use for crosslinking unsaturated polymers, as well as a curable composition comprising (a) a polynitrone, (b) an unsaturated polymer, (c) optionally fillers and (d) optionally pigments and their use as adhesive, putty, sprayable thick-layer filling, powder coating and / or paint based on solvent systems. Furthermore, the invention relates to crosslinking products obtainable by curing the curable composition according to the invention. Finally, the invention relates to polynitrone-terminated polyurethanes and unsaturated polyester-urethane polynitrone and to processes for their preparation.
• Netrone are known in the field of organic chemistry. Usually, these include compounds with the structural element
• Nitrone are also referred to as azomethine oxides.
• Polymers with unsaturated groups can generally be used for powder coating systems.
• Powder coatings have ecological advantages over conventional coating systems. They are applied solvent-free and thus emission-free. Overspray, which means paint particles that do not hit the substrate to be painted, is recovered and reused. This makes it possible to exploit almost 100 percent of the powder coating substance.
• the solid coating raw materials such as binders, hardeners, pigments, fillers and additives are mixed and kneaded in an extruder at 100- 140 0 C in a highly viscous state to a homogeneous mass and dispersed.
• the powder coatings produced according to FIG. 1 are fluidized by supplying air before the actual application of powder and conveyed to the gun in this liquid-like state. There, the charging of the powder takes place by charging at an electrode by means of high voltage. The thus conditioned powder is deposited on a suspended object.
• UV powder coating technology is a technique whereby the powder coatings are cured at low temperatures by UV radiation. This technology makes it possible to powder coat the surfaces of thermally sensitive products such as wood surfaces, medium density fiberboard (MDF), plastic surfaces or paper. After deposition of the powder on the substrate, the applied sheets are tempered in the oven (100- 140 0 C) and then cured by UV.
• the curing reaction in UV technology is usually a radical polymerization of acrylic ester derivatives. This reaction is initiated by a photoinitiator that is excited by the UV light and forms radicals.
• Raw materials used as binders are usually polyfunctional acrylic ester derivatives, epoxy resins, polyethers and polyurethanes or else a combination of an unsaturated polyester with a polyfunctional vinyl ether crosslinker.
• the UV-curable powder coatings are characterized by a low load of the coating material, shorter curing times and good optical properties. On the other hand, however, there are unresolved difficulties. These include, above all, the minimization of the layer thicknesses and the difficult surface structuring. Depending on where the powder coatings are used, there are many areas, such as the furniture industry, where the gloss of the powder coating must be reduced. Due to the limited layer thicknesses in the radiation-curable powder coatings, many techniques with which the conventional, thermally curable powder coatings are normally structured and modified, for example by means of pigments, fillers or solid additives, can not be used. Furthermore, the matting of UV curable powder coatings is difficult. A complex option is the mixtures of amorphous and crystalline resins. US Pat. No. 6,777,027 B2 describes another complicated method of matting radiation-curable coatings, wherein the combination of a free-radically and cationically-curable binder resin in the powder coating described causes the matting.
• the object of the invention was to find a curable material that does not have the disadvantages of the existing systems. It should be able to cure quickly at moderate temperatures, be provided with various pigments and fillers, and satisfy the physical and chemical requirements desired by industry in a wide range. The curable material should make it possible to influence the degree of matting.
• a curable composition which is in the form of a 1-component system (hereinafter referred to as 1K system) or a 2-component system (hereinafter referred to as 2K system).
• the invention therefore relates to the use of polynitrons for crosslinking unsaturated polymers.
• the invention further provides a curable composition comprising
• the invention further provides a process for the preparation of a crosslinking product comprising the steps
• the invention also relates to crosslinking products obtainable by this process and to their use for the production of glass-fiber-reinforced polyester parts, preferably in shipbuilding.
• the invention relates to specific Polynitrone as such, in particular Polynitron terminated polyurethanes, and a process for their preparation.
• the invention relates to an unsaturated polyester-urethane polynetron and a process for its preparation.
• Crosslinking is understood to mean the formation of covalent or ionic bonds between polymer chains. Crosslinking usually forms a so-called "three-dimensional structure".
• polynitrone can be used to advantageously alter the mechanical and / or optical properties of an unsaturated polymer.
• the mechanical properties can be advantageously changed by curing the unsaturated polymer.
• the optical properties can be advantageously changed by matting.
• polynitrone is understood to mean a polyfunctional nitrone, ie the term “polynitrone” describes an organic compound which has two or more nitrone groups.
• the polynitrone used preferably has 2 to 12, more preferably 2 to 5, in particular 3 to 4, nitrone groups. - -
• the polynitrone used according to the invention is a compound according to the general formula I 1
• R 1 , R 2 or R 3 may generally be any organic radicals.
• R 1 is an optionally substituted linear, cyclic or branched, alkylene group, alkyleneoxy group, arylene group, aryleneoxy group, naphthylene group or combinations thereof.
• R 2 and R 3 are independently of one another hydrogen or an optionally substituted linear or branched alkyl group, aryl group, heteroaryl group, alkylaryl group, alkoxyl group, cycloalkyl group or combination thereof.
• the group R 1 contains one or more of the following groups:
• R 2 and R 3 are more preferably a hydrogen atom or a group.
• R 2 is a hydrogen atom.
• R 3 is a methyl group.
• the aromatic rings may optionally be substituted in one or more positions.
• the radical R 1 may be bonded to a polymer.
• the polymer is preferably selected from polyurethanes, polyesters, unsaturated polyesters, poly (meth) acrylates, polysaccharides or combinations thereof. As described in more detail below is in the case of the IC system R 1 bound in particular to an unsaturated polyester urethane.
• the above-mentioned polynitrone are used for crosslinking unsaturated polymers.
• unsaturated polymer is usually understood as meaning a polymer having one or more unsaturated carbon-carbon bonds in the polymer chain.
• the degree of unsaturated carbon-carbon bonds can be determined by DIN53241 and expressed by the unit "meq / g".
• the unsaturated polymers have 0, 1 to 50, preferably 1 to 20 meq / g.
• the unsaturated polymers are preferably selected from polyolefins, polystyrene, polyvinyl alcohol, polyvinyl acetate, polyalkylene glycol, polyethylene oxide, polypropylene oxide, polyacetals, polyurethanes, polyureas, polyamides, polycarbonates, polyketones, polysulfones, phenol-formaldehyde resins, polyesters, polyester acrylates, polyurethane acrylates, cellulose, Gelatin, starch, and mixtures thereof.
• Suitable unsaturated polyesters are generally polycondensation products of ⁇ , ⁇ -ethylenically unsaturated dicarboxylic acids, such as maleic acid, fumaric acid, itaconic acid, mesaconic acid and citraconic acid, with polyalcohols, such as ethylene glycol, diethylene glycol, propane, butane and hexane diols , Trimethylolpropan and pentaerythritol, which may still residues of saturated carboxylic acids, eg.
• succinic acid glutaric acid, adipic acid, phthalic acid, tetrachlorophthalic acid, further monofunctional alcohols such as butanol, tetrahydrofuyl alcohol and ethylene glycol monobutyl ether, as well as monobasic acids such as benzoic acid, oleic acid, linseed oil fatty acid and ricinoleic acid may contain.
• Suitable monomeric unsaturated compounds which can be copolymerized with the unsaturated polyesters are, for example, vinyl compounds, such as styrene, vinyltoluene, and divinylbenzene, furthermore vinyl esters, such as vinyl acetate, and then unsaturated carboxylic acids and their derivatives, such as methacrylic acid, esters and nitrile, furthermore allyl esters, such as allyl acetate, allyl acrylate, diallyl phthalate. Triallyl phosphate and triallyl cyanurate.
• unsaturated polyesters containing maleate and fumarate groups are used.
• the unsaturated polymers usually have a weight-average molecular weight of from 200 to 500,000 g / mol, preferably from 1,000 to 200,000 g / mol, more preferably from 10,000 to 100,000 g / mol.
• the invention thus provides a curable composition
• a curable composition comprising
• the curable composition of the invention is a 2-component system.
• components (a) and (b) are in the form of two compounds.
• components (a) and (b) are separate compounds that are not covalently linked prior to curing.
• the polynitrone (a) is in an amount of 0.1 to 50% by weight, more preferably 1 to 20% by weight, especially 5 to 15% by weight, based on the total weight of the composition.
• the curable composition is a 1-component system.
• components (a) and (b) are in the form of a polynitron-terminated unsaturated polymer.
• components (a) and (b) are united within one compound.
• the combined components (a) and (b) are preferably an unsaturated polyester polynitrone, more preferably an unsaturated polyester urethane polynitrone.
• the ratio of nitrone groups (from component a) and unsaturated carbon-carbon bonds (from component b) may be 10: 1 to 1:10, preferably 5: 1 to 1: 5, especially 2: 1 to 1: 2.
• the curable composition of the invention may optionally comprise components (c) fillers and (d) pigments. Further, the composition may further comprise one or more additives such as plasticizers and stabilizers. Finally, the curable composition may still comprise (f) photoinitiators.
• the components (a) and (b) are usually in the composition according to the invention in an amount of 30-100% by weight. preferably from 40 to 99% by weight, more preferably from 55 to 95% by weight, based on the total weight of the composition.
• Suitable fillers (c) are in principle all inorganic and organic fillers, as described, for example, in Rompp Lexikon Lacke und Druckmaschine, Georg Thieme Verlag, Stuttgart, New York, 1998, "Fillers", pages 250 to 252.
• suitable fillers are wood flour, saturated organic or organometallic polymers, inorganic minerals, salts or ceramic materials or organically modified ceramic materials or mixtures of these substances.
• Inorganic minerals are preferably used. These may be natural and synthetic minerals.
• suitable minerals are silicon dioxide, aluminum silicates, calcium silicates, magnesium silicates, calcium aluminum silicates, magnesium aluminum silicates, calcium magnesium silicates, beryllium aluminum silicates, aluminum phosphate or calcium phosphate, or mixtures thereof.
• fillers (c) are generally present in an amount of from 0 to 50% by weight, preferably from 5 to 40% by weight, more preferably from 10 to 30% by weight, based on the total weight of the composition.
• composition according to the invention may further comprise as component (d) optionally at least one colorant, preferably a pigment.
• the colorant may be a pigment or a dye.
• pigments for example, colored pigments or effect pigments can be used.
• effect pigments it is possible to use metal flake pigments, such as commercial aluminum bronzes, chromatized aluminum bronzes, commercially available high-grade steel bronzes and non-metallic effect pigments, for example pearlescent or interference pigments.
• metal flake pigments such as commercial aluminum bronzes, chromatized aluminum bronzes, commercially available high-grade steel bronzes and non-metallic effect pigments, for example pearlescent or interference pigments.
• suitable inorganic color pigments are titanium dioxide, iron oxides, and carbon black, in particular carbon black.
• suitable organic coloring pigments are thioindigo pigments, indanthrene blue, cromophthal red, irgazine orange and heliogen green, copper phthalocyanine.
• thioindigo pigments indanthrene blue, cromophthal red, irgazine orange and heliogen green, copper phthalocyanine.
• coloring agents preferably pigments (d) are generally present in an amount of from 0 to 30% by weight, preferably from 1 to 20% by weight, more preferably from 2 to 10% by weight, based on Total weight of the composition, included.
• composition of the invention may contain at least one additive (s).
• suitable additives are additional oligomers and polymeric binders, UV absorbers, light stabilizers, free-radical scavengers, thermolabile free-radical initiators, deaerating agents, slip additives, polymerization inhibitors, defoamers, emulsifiers, wetting agents and dispersants, adhesion promoters, leveling agents, film-forming auxiliaries, flameproofing agents.
• suitable additives are additional oligomers and polymeric binders, UV absorbers, light stabilizers, free-radical scavengers, thermolabile free-radical initiators, deaerating agents, slip additives, polymerization inhibitors, defoamers, emulsifiers, wetting agents and dispersants, adhesion promoters, leveling agents, film-forming auxiliaries, flameproofing agents.
• Protective agents corrosion inhibitors, anti-caking agents, waxes and matting agents.
• additives (e) are generally present in an amount of from 0 to 20% by weight, preferably from 0.1 to 10% by weight, more preferably from 1 to 5% by weight, based on the total weight of the composition.
• the curable composition of the invention contains no catalysts that catalyze the crosslinking of the unsaturated carbon-carbon bonds in component (b).
• the curable composition of the invention may contain one or more photoinitiators (f).
• An example of a suitable photoinitiator is Irgacure®.
• Photoinitiators may be used in an amount of 0-5 wt%, preferably 0.01-3 wt%, more preferably 0.4-2.0 wt%, based on the total weight of the composition.
• photoinitiators (f) are used when the polynucleotides (a) are to serve as matting agents.
• the curable composition according to the invention is preferably used as an adhesive, filler, sprayable thick-layer filling, powder coating and / or paint based on solvent systems.
• the invention therefore also an adhesive, a filler, a sprayable thick-film filling, a powder coating and / or paint based on solvent systems, comprising the composition of the invention.
• the composition according to the invention is preferably in the form of a powder coating.
• the curable composition of the present invention may be processed by curing (ie, by crosslinking) into a crosslinked product.
• the curing ie the crosslinking
• the invention therefore also provides a process for the preparation of a crosslinking product comprising the steps
• the invention likewise provides a crosslinking product obtainable by the process according to the invention.
• the curing / crosslinking can be carried out by mixing and tempering the constituents of the hardenable composition.
• the unsaturated polymer (b) and the polynitrone (a) may be ground to a powder and mixed, for example, in a conventional mill (optionally together with ingredients (c) - (e)) become.
• Another possibility of mixing is by means of a solvent system in which both the unsaturated polymer and the polyfunctional nitrones (optionally together with components (c) - (e)) are dissolved or dispersed.
• the ingredients are first converted to a uniform mixture, and after removal of the solvent, curing / crosslinking is accomplished by heating to the desired temperature.
• the curing time is usually 10 seconds to 2 hours, preferably 20 seconds to 60 minutes, more preferably 30 seconds to 15 minutes, more preferably 1 minute to 10 minutes.
• novel crosslinking products are usually dependent on the type of unsaturated polymer used. It is preferably elastic soft to hard crosslinking products. These are preferably inert to water and organic solvents
• the novel crosslinking products are versatile. Examples are dental materials, household appliances, cake plates, general Construction industry, baths and sinks.
• the crosslinking products according to the invention are preferably used as a lacquer layer.
• the crosslinking products according to the invention are used as (preferably glass-fiber-reinforced) polyester parts, in particular in shipbuilding.
• the curable composition according to the invention and the crosslinking product according to the invention are also part of the invention.
• the invention therefore also relates to polynitrone selected from terephthalaldehyde bis (N-phenylnitrone), isophthalaldehyde bis (N-phenylnitrone),
• Isophthalaldehyde bis (N-methylnitrone), terephthalaldehyde bis (N-butyl nitrone), isophthalaldehyde bis (N-cyclodecyl nitrone), isophthalaldehyde bis (N-cyclohexyl nitron), 4,4'-decanediyl dioxydi (N-methyl-p phenylnitrone), 4,4'-hexanediyldi- oxydi (N-methyl-p-phenylenemonoic, 4,4'-butanediyldioxydi (N-methyl-p-phenylenedi- nitrone), 4,4'-ethanediidioxydi (N-methyl- p-phenylenenitrone) and polynetron-terminated polyurethanes.
• polynitron-terminated polyurethane is generally meant a compound comprising two or more urethane groups and two or more nitrone groups.
• polynitrone-terminated polyurethane according to the general formula II
• x is a natural number from 2 to 5, more preferably 3 or 4.
• R 1 and R 3 are each independently preferably an optionally substituted a linear, cyclic or branched alkylene group, alkyleneoxy group, arylene group, aryleneoxy group, naphthylene group or combinations thereof.
• R 2 , R 4 and R 5 are preferably a hydrogen atom or a C 1 -C 6 -alkyl group.
• R 2 and R 4 are a hydrogen atom and R 5 is a methyl group.
• the invention provides a polynitron-terminated polyurethane according to the general formula III
• x is a natural number of 2 to 5, more preferably 3 to 4.
• R 1 and R 3 are preferably independently an optionally substituted linear, cyclic or branched, alkylene group, alkylenoxy, arylene group. Aryleneoxy group, naphthylene group or combinations thereof.
• R 4 , R 5 , Re and R 7 are preferably a hydrogen atom or a C 1 -C 6 alkyl group. In particular, R 4 , R 5 and R 6 are a hydrogen atom and R 7 is a methyl group.
• R 2 is preferably a diphenylmethane radical, a tolylene radical or an isophorone radical.
• the invention further provides a polynitrone-terminated polyurethane according to the general formula IV
• R 1 and R 1 ' are preferably an optionally substituted linear, cyclic or branched, alkylene group, alkyleneoxy group, arylene group, aryleneoxy group, naphthylene group or combinations thereof.
• R 3 , R 3 , R 4 , R 4 ' , R 5 and R 6' are preferably a hydrogen atom or a C 1 -C 6 -alkyl group.
• R 3 , R 3 , R 4 and R ⁇ are a hydrogen atom and R 5 and Rs- is a methyl group.
• R 2 is preferably a diphenylmethane radical, a tolylene radical or an isophorone radical.
• R is an organic radical, preferably a diphenylmethane radical, a tolylene radical or an isophorone radical, and
• the invention further provides a process for preparing a polynitrone-terminated polyurethane according to the invention, comprising the steps
• step (ii) reacting the hydroxy-nitro compound resulting from step (i) with a polyisocianate, the reaction ratio preferably being chosen so that all isocyanate groups react.
• polyisocyanates are generally known from the prior art aliphatic, cycloaliphatic and aromatic isocyanates in question. Examples are 2,2'-, 2,4'- and / or 4,4'-diphenylmethane diisocyanate (MDI), 1, 5-naphthylene diisocyanate (NDI), 2,4- and / or 2,6-toluene diisocyanate (TDI), diphenylmethane diisocyanate, 3,3'-dimethyl-diphenyl-diisocyanate, 1, 2-diphenylethane diisocyanate and / or phenylene diisocyanate, tri-, tetra-, penta-, hexa-, hepta- and / or octamethylene diisocyanate, 2-methylpentame - Thylene diisocyanate 1, 5, 2-ethyl-butylene-diisocyanate-1, 4, pentamethylene diis
• a compound having both a hydroxy function and an aldehyde function is basically suitable.
• a 4-hydroxyalkyloxy-3,5-dimethyloxybenzaldehyde is used, wherein the alkyl radical comprises 1 to 12 carbon atoms. Examples of these are methyl, ethyl, propyl or hexyl.
• 4-hydroxyethyloxy-3,5-dimethoxybenzaldehyde (hereinafter referred to as HEBA) is used.
• HEBA 4-hydroxyethyloxy-3,5-dimethoxybenzaldehyde
• HEBN HEBN is thus also the subject of the invention.
• the process according to the invention for preparing a polynitrone-terminated polyurethane according to the invention comprises two alternatives, these are to be illustrated in the following reaction diagram.
• R is an organic radical
• R is preferably a diphenylmethane radical, a tolylene radical or an isophorone radical, so that the resulting isocyanate is preferably MDI, TDI or IPDI.
• a urethane polyaldehyde is used.
• a compound having two or more urethane groups and two or more aldehyde groups is used.
• x is a natural number from 2 to 12 and R 1 to R 5 is an organic radical.
• x is a natural number of 2 to 5, more preferably 3 or 4.
• R 1 and R 3 are preferably an optionally substituted linear, cyclic or branched alkylene group, alkyleneoxy group, arylene group, aryleneoxy group, naphthylene group or combinations thereof.
• R4 and R5 are preferably a hydrogen atom or a C ⁇ -C ⁇ -alkyl group, in particular a hydrogen atom.
• R 2 is preferably a diphenylmethane radical, a tolylene radical or an isophorone radical.
• the invention further Urethanpolyaldehyde the general formula VI
• R 1 and Ry are preferably an optionally substituted linear, cyclic or branched, alkylene group, alkyleneoxy group, arylene group, aryleneoxy group, naphthylene group or combinations thereof.
• R 3 , R 3 , R 4 and R 4 ' are preferably a hydrogen atom or a C ⁇ -C ⁇ -alkyl group, in particular a hydrogen atom.
• R 2 is preferably a diphenylmethane radical, a toluene radical or an isophorone radical.
• urethane polyaldehydes examples include the following compounds:
• R is an organic radical, preferably a diphenylmethane radical, a toluene radical or an isophorone radical, and
• Compound 5 is a trifunctional urethane aldehyde.
• Three and more functional urethane aldehydes can be obtained by reacting a trihydric and polyfunctional starter molecule with the hydroxy aldehyde and the polyisocyanate.
• suitable starter molecules are, for example, glycerol, trimethylolpropane and pentaerythritol.
• the invention relates to processes for the preparation of an unsaturated polyester urethane polynitrone comprising the steps
• unsaturated polyester-urethane polynitron is understood as meaning a polyester which has at least one carbon-carbon double bond in the polymer chain and which furthermore has at least two urethane groups and nitrone groups.
• the unsaturated polyester urethane polynitrone obtainable by the process according to the invention.
• unsaturated polymers preferably unsaturated polyester resins
• novel crosslinking method ie by the use according to the invention of polynitrons.
• the crosslinking is fast and provides thermally and mechanistically stable products.
• the crosslinking products according to the invention are characterized by their extremely versatile usability at a relatively low cost in the production. They are easy to handle, can be used alone or optionally together with smaller amounts of other polymers and can be processed with a large number of fillers, since they have an excellent wetting ability.
• Unsaturated polyester-urethane-polynitrates according to the invention are advantageous curable one-component systems which contain both the unsaturated functions and the nitrone groups in a polymer skeleton, so that they are preferably thermally self-crosslinkable without an additional crosslinker or catalyst
• TMP trimethylolpropane
• DBTL dibutyltin laurate
• Example 5 The urethane-aldehyde (5) isolated in Example 5 is suspended in 25 ml of 2 N NaOH solution (in ethanol). 2.24 g (25.9 mmol) of N-methylhydroxylamine hydrochloride dissolved in 5 ml of water are then added to the suspension for 12 hours at RT. The precipitated product is filtered off, washed with water and dried in a drying oven under vacuum at 40 °.
• Example 7 Characterization of a commercially available unsaturated polyester UP-I (7)
• UP-I (7) is the commercial product of the company DSM (Uracross P 3125), with the building blocks terephthalate / fumarate / neopentyl glycol.
• a mixture of 1, 96 g (0.02 mol) of maleic anhydride (MA), 2.36 g (0.02 mol) of hexanediol (hex), 0, 1 wt .-% toluenesulfonic hydrate and 1 wt .-% BHT Stabilizer are heated for 30 min in the microwave (CEM) at 200 0 C at a microwave power of 300 watts under reflux.
• CEM microwave
• the reaction product is dissolved in acetone and then precipitated by the addition of petroleum ether (60/80). After the solvent has been decanted, the unsaturated polyester is dried under vacuum
• Example 9 Preparation of a hydroxy-terminated unsaturated polyester (UP-3, 9)
• the resulting unsaturated polyester urethane nitrone is a 1K system that is crosslinked in Example 15.
• the first DSC heating curve in Figure 2 shows that UP-2 (8) has a T g of -47 0 C prior to crosslinking. Immediately after the Homogenticianspro- process the cross-linking of the mixture occurs at about 80 0 C, which is easily recognized in the first heating curve by the exothermic peak. The second heating curve shows no exothermic peak due to the complete crosslinking process and as a consequence of the restricted chain mobility. By networking, a Ty value shifted by about 13 0 C (-34 0 C) compared to the first heating curve.
• FIG. 4 depicts the crosslinking of the unsaturated polyester UP-2 (8) with DN-IO (2) (Example 13).
• the crosslinking method according to the invention provides new possibilities for the development of new materials according to an environmentally friendly variant.
• thermosetting paints in particular water-based paints
• the invention is in addition to the above areas an optimal solution for the matting of curable powder coatings. This is about the inventive use of polynitrates as Mattier ungsffen. It has unexpectedly been found that the curable powder coatings, in particular UV-curable powder coatings, show very good matting properties by the addition of polynitrons.
• Powder coating P-UP (12) is applied to various surfaces (glass, PET foils, phosphated steel). After 15 minutes tempering in an oven at 140 0 C and subsequent UV curing all surface-applied chen Attachen show very high gloss (60 degree gloss> 90%).
• Polynitron DN-10 (2) in dry form, was added to the finished powder coating P-UP (12), the finely ground polynitrone having an average particle size of about 40-50 ⁇ m. After physical homogenization, the application was carried out on various surfaces (glass, PET films, phosphated steel sheet). The sheets thus applied are tempered in the oven for 15 min at 140 0 C and then cured by UV radiation. Here, the weight content of Polynitron 1- 1% of the total powder coating amount. All applied surfaces show a strong gloss reduction (60 ° gloss: ⁇ 50%).
• FIG. 5 shows powder-coated glass surfaces with and without the addition of Polynitron DN-10 (2).
• Figure 5 is a photomicrograph of the coated glass surface once without (left) and once with (right) addition of Polynitron DN-10 (2).
• the invention also relates to the use of polynitrons as matting agent.
• polynitrons as matting agent.
• powder coating systems based on the following systems can be frosted by the addition of polynitrons.
• Unsaturated polyester - urethane (meth) acrylates e.g. described under US Patent 006284321B 1.
• All described powder coating classes are preferably prepared according to the process shown in FIG. 1 and subsequently mixed with the appropriate amounts of polynitrons and then physically homogenized and then applied to the various surfaces.
• the invention is a new (environmentally friendly) crosslinking method, whereby the use of polynitrons makes the industrially important resins, e.g. unsaturated polyesters and (meth) acrylates can be cured or patterned at low temperatures.
• the invention solves above all the problems of the paint manufacturer in the conversion from conventional to environmentally friendly painting methods.

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• Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
• Compositions Of Macromolecular Compounds (AREA)
• Polyesters Or Polycarbonates (AREA)
• Paints Or Removers (AREA)

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• 2007
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  • 2008-12-10 WO PCT/EP2008/010487 patent/WO2009074310A1/de active Application Filing
  • 2008-12-10 US US12/747,582 patent/US8883931B2/en active Active
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