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
  • C08G18/28—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
  • C08G18/38—Low-molecular-weight compounds having heteroatoms other than oxygen
  • C08G18/3819—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen
  • C08G18/3823—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing -N-C=O groups
  • C08G18/3831—Low-molecular-weight compounds having heteroatoms other than oxygen having nitrogen containing -N-C=O groups containing urethane 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
  • C08G18/16—Catalysts
  • C08G18/22—Catalysts containing metal compounds
  • C08G18/222—Catalysts containing metal compounds metal compounds not provided for in groups C08G18/225 - C08G18/26
• • 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
• • 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
  • C08G18/36—Hydroxylated esters of higher fatty acids
• • 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
  • C08G18/77—Polyisocyanates or polyisothiocyanates having heteroatoms in addition to the isocyanate or isothiocyanate nitrogen and oxygen or sulfur
  • C08G18/78—Nitrogen
  • C08G18/79—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates
  • C08G18/798—Nitrogen characterised by the polyisocyanates used, these having groups formed by oligomerisation of isocyanates or isothiocyanates containing urethdione groups
• • 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

Definitions

• the invention or inventions described in this disclosure relate to oligomers, methods for making oligomers, coating compositions containing such oligomers, and cured coatings derived from such coating compositions.
• Oligomers are useful components in curable compositions such as coating compositions. Oligomers can be used in coating systems, for example, as diluents or curing agents that undergo reaction under cure conditions to form a cured, crosslinked film.
• coating systems for example, as diluents or curing agents that undergo reaction under cure conditions to form a cured, crosslinked film.
• One problem with making oligomers has been producing oligomers of consistent identity, molecular weight, or both due to the variety of oligomers that can be formed when using polyfunctional reactants. Primarily simplistic systems of linear oligomers formed from difunctional reactants have been attempted. Work using trifunctional or even higher functionality reactants has produced gelled materials with other polyfunctional materials.
• oligomers may be useful in coating compositions if oligomer identity and molecular weight are such that properties of the coating composition like volatile organic content, cure temperature, and physical cured film properties are improved by incorporating the oligomer.
• each R 1 is independently selected from alkylene groups having 1 to 12 carbon atoms, arylene groups having 5 to 12 carbon atoms, and arylalkylene and alkylarylene groups having 6 to 15 carbon atoms, wherein alkylene groups, alkylene portions of arylakylene groups, and alkyl portions of alkylarylene groups may be linear, branched, or cyclic;
• compounds (II) selected from compounds having one group having an active hydrogen reactive with isocyanate and a primary carbamate group (for example, a compound of structure (Ha)) or cyclic carbonate group (for example, a compound of structure (lib)):
• X is O or NR , wherein R 2 is H or alkyl having 1 to 6 carbon atoms; n is 1 to 4, in certain embodiments 1 or 2; and R is alkyl, aryl, alkylaryl, or arylalkyl having up to 12 carbon atoms and optionally including one or more heteroatoms, which heteroatoms in some particular embodiments may be part of a group selected from ether, ester, amide, tertiary amine, urea, and urethane groups,
• a compound (III) comprising a structure (HIb) or (IIIc) is further reacted with ammonia under reaction conditions that preserve the uretdione structure to produce a compound comprising a structure (HId) as the reaction product with a compound of the structure (HIb):
• a curable oligomer is then produced by a method in which compound (III) (as one or more of its structures (Ilia) to (HIc)) may be further reacted with a reactant having at least two active hydrogen-containing groups selected from polyols, polyamines having at least two amine groups selected from primary and secondary amine groups, and aminoalcohols having at least one amine group that is a primary or secondary amine group to form a product that is an oligomer.
• the reactant having at least two active hydrogens may be represented by a formula P(XH) m , in which X is as previously defined, m is an integer that is 1 or greater when X is NH or 2 or greater when X is not NH, and P represents an m-valent core of the reactant.
• m is an integer from 2 to about 40; m may also be an integer from 2 to about 20, or from 2 to about 10.
• the reactant P(XH) m may be a simple polyfunctional compound
• the reactant P(XH) n is itself an oligomer or polymer; in such embodiments, the alcohol and/or amine groups may be in terminal positions, located along the oligomer or polymer backbone, or both.
• the product comprises a material having a structure (IVa):
• a compound (III) having a structure (HId) may be self-polymerized by opening the uretdione ring with catalyst, heat, or both, the resulting monoisocyanate, monohydroxy compound being self-condensed to form an oligomer comprising repeating monomer units of structures (IVc):
• a small amount of a monohydroxyl compound or other compound with a single isocyanate-reactive group may be introduced to terminate the polymerization at a desired weight average molecular weight for the product.
• a compound (III) having a structure (HIe) could be reacted with a mixture of polyfunctional and monofunctional active hydrogen-containing compounds under conditions that open up the uretdione ring to provide a mixture of self-polymerized and interpolymer products as one side of the uretdione compound produces the precursor to the monomer units of structure (IVc) while the other side produces a monofunctional isocyanate compound.
• each R 1 is independently selected from alkylene groups having 1 to 12 carbon atoms, arylene groups having 5 to 12 carbon atoms, and arylalkylene and alkylarylene groups having 6 to 15 carbon atoms, wherein alkylene groups, alkylene portions of arylakylene groups, and alkyl portions of alkylarylene groups may be linear, branched, or cyclic is reacted with compound (II) having both an active hydrogen group and a carbamate or cyclic carbonate group, which compound (II) may have structure (Ha), structure (lib), or a combination of both structures
• each R 1 is independently a divalent hydrocarbylene of 4 or 6
• n is an integer from 3 to 6 and m is an integer from 1 to about 10, and in some embodiment m is an integer from 1 to about 4.
• Compounds of structures (I) and (II) are commercially available.
• Uretdiones of structure (I) may be made, for example, by dimerization of diisocyanates according to well-known methods, for example as described in U.S. Patent Application Publication No. US 2007/0032594, incorporated herein by reference. Some trimerization of the diisocyanate (to form an isocyanurate) may also occur.
• Commercial sources of uretdiones may contain 5 to 30% by weight of the corresponding isocyanurate of the diisocyanate.
• the trimer compound does not generally cause problems in the first reaction step or in later reaction steps, but when a mixture of the uretdione and isocyanurate of a diisocyanate is used, the oligomer product will be expected to also contain the reaction product of the isocyanurate and compound (II).
• the compound (I) comprises the uretdione of hexamethylene diisocyanate, which is commercially available as DESMODUR® N3400 from Bayer Corporation, Pittsburgh PA, which is a mixture of the uretdione and isocyanurate of hexamethylene diisocyanate, or DESMODUR® XP-2730.
• Nonlimiting, illustrative examples of suitable catalysts that may be used during the reaction of the first step include tertiary amines such as triethylamine, DABCO, and organotin and organobismuth compounds such as dibutyltin dilaurate, dibutyltin oxide, bismuth octoate, and combinations of these.
• the amount of catalyst, if used, is generally from about 0.01 to about 5 wt.% based on the total weight of compounds (I) and (II).
• the catalyst in certain embodiments may be from about 0.05 to about 2 wt.% based on the total weight of compounds (I) and (II), or may be from about 0.1 to about 1 wt.% based on the total weight of compounds (I) and (II).
• the reaction of the first step may be carried out neat or in the presence of one or more non-protic (and thus unreactive) solvents.
• suitable solvents include aliphatic and aromatic hydrocarbons such as toluene, xylene, and Aromatic 100 (e.g., available from ExxonMobil as SOLVESSO 100); ketones such as methyl ethyl ketone, methyl isobutyl ketone, and methyl propyl ketone; esters such as propyl acetate, butyl acetate, amyl acetate, ethyl propionate, and propyl propionate; and glycol diethers and ether esters such as ethylene glycol diethyl ether, ethylene glycol monobutyl ether acetate, propylene glycol monopropyl ether acetate; and so on.
• Suitable solvents may be used in combination.
• reaction of the cyclic carbonate ring with ammonia may be carried out under mild conditions at temperatures at which the uretdione ring is preserved; for example at room temperature or lower, particularly at 10°C or lower, and more particularly at 0° C or lower. It can be carried out in organic solvents such as methanol, or the reaction can be carried in water, or a mixture of water and organic solvents. When water is used as the sole solvent or as a part of a solvent blend, ammonium hydroxide may be used in place of ammonia. Alternatively, liquefied ammonia may be used as the solvent.
• the compound (III) is reacted with a reactant having at least two active hydrogens.
• the reactant having at least two active hydrogens may be represented by a formula P(XH) n , in which X is as previously defined, m is an integer that is 1 or greater when X is NH or 2 or greater when X is not NH, and P represents an m-valent core of the reactant.
• m is an integer from 2 to about 40; m may also be an integer from 2 to about 20, or from 2 to about 10.
• the reactant P(XH) n may be a simple polyfunctional compound, in certain embodiments, the reactant P(XH) n , is itself an oligomer or polymer; in such embodiments, the alcohol and/or amine groups may be in terminal positions, located along the oligomer backbone, or both, with a plurality of active hydrogens to form an oligomer (V) under reaction conditions that cause the four-membered uretdione ring to cleave and react with the active hydrogens.
• oligomer (V) As should be readily recognized, if the two fragments of compound (III) formed by cleaving the uretdione ring are different or if a plurality of compounds (III) of different structures are reacted, more than one oligomer (V) can be formed. In some embodiments, a symmetrical compound (III), which generates identical fragments when the uretdione ring cleaves, is used so that oligomer (V) molecules will all be of the same structure.
• Nonlimiting, illustrative examples of active hydrogen groups of the reactant having at least two active hydrogens are hydroxyl groups, primary amine groups, secondary amine groups, and thiol groups.
• the reactant having at least two active hydrogens in certain embodiments may have (and thus m may be) 2 to about 40 or 2 to about 20, or from 2 to about 10 groups containing active hydrogens, which may be selected from the examples of such groups just mentioned.
• reactant P(XH) n can be selected from polyols (including diols, triols, and polyols of higher functionality (P(OH) m ), polyamines (including diamines, triamines, and polyamines of higher functionality(P(NR 2 H) m )), aminoalcohols (P(OH) ⁇ (NR 2 H) m-n , wherein n is an integer of at least one and less than m), and combinations of these.
• polyols including diols, triols, and polyols of higher functionality
• polyamines including diamines, triamines, and polyamines of higher functionality(P(NR 2 H) m )
• aminoalcohols P(OH) ⁇ (NR 2 H) m-n , wherein n is an integer of at least one and less than m
• suitable materials (IV) include 1 ,4-butanediol, 1,3-butanediol, 2,3- butanediol, 1 ,6-hexanediol, neopentyl glycol, 1,3-propanediol, 1,5-pentanediol, 1,6- hexanediol, 1 ,9-nonanediol, ethylene glycol, diethylene glycol, triethylene glycol and tetraethylene glycol, propylene glycol, dipropylene glycol, glycerol, cyclohexanedimethanols, 2-methyl-2-ethyl-l ,3 -propanediol, 2-ethyl-l ,3-hexanediol, 2,2,4-trimethyl-l ,3-pentanediol, cyclohexanediols, tri
• Examples in which the active hydrogen functional reactant is an oligomer include, without limitation, any of the above-mentioned polyols that has been extended by condesation with a lactone, such as epsilon-caprolactone; low molecular weight, hydroxyl-functional polyesters, polyureas, or polyurethanes; and dimer fatty acid diols.
• Illustrative examples of specific compounds include trimethylolpropane extended with epsilon-caprolactone (which may be prepared with a reactant ratio of 1 mole of trimethylolpropane to from 3 to 12 moles of epsilon-caprolactone), the reaction product of the trimer of isophorone diisocyanate with 2-ethyl-l,3-hexanediol, and Polycin M-365 from Vertellus.
• epsilon-caprolactone which may be prepared with a reactant ratio of 1 mole of trimethylolpropane to from 3 to 12 moles of epsilon-caprolactone
• the reaction product of the trimer of isophorone diisocyanate with 2-ethyl-l,3-hexanediol and Polycin M-365 from Vertellus.
• reaction of compound (III) is reacted with the reactant having at least two active hydrogens may be carried out under conditions known to cleave a uretdione ring of compound (III) and under which the resulting isocyanate groups will react with the active hydrogens of the reactant having at least two active hydrogens.
• Suitable reaction temperatures may depend in part on the catalyst used, if a catalyst is used. Typical reaction temperatures when a catalyst for opening the uretdione ring is used are from about from about 20 0 C. to about 115 °C. In other embodiments, the reaction may be carried out at a temperature of from about 20°C. to about 110 0 C. or at a temperature of from about 50 0 C. to about 110 0 C.
• the reaction can occur in the presence or absence of solvent.
• the reaction can be carried out using the same reaction solvents, and in the presence of the catalyst, as used in the reaction between compounds (I) and (II).
• Exemplary solvents are organic solvents that are inert to the reaction and include xylene, toluene, aromatic S- 100, methyl amyl ketone, butyl acetate, amyl acetate,, and the like. If desired, the reaction can be performed at above atmospheric pressure. The extent of reaction may be followed by disappearance of a peak associated with the uretdione group using infrared spectroscopy.
• a compound (III) having a structure (HId) may be self-polymerized by opening the uretdione ring with catalyst, heat, or both, the resulting monoisocyanate, monohydroxy compound being self-condensed to form an oligomer comprising repeating monomer units of structures (IVc):
• n is an integer from 1 to 4 and R 1 is as previously defined.
• a small amount of a monohydroxyl compound or other compound with a single isocyanate-reactive group may be introduced to terminate the polymerization at a desired weight average molecular weight for the product.
• a compound (III) having a structure (HIe) could be reacted with a mixture of polyfunctional and monofunctional active hydrogen-containing compounds under conditions that open up the uretdione ring to provide a mixture of self-polymerized and interpolymer products as one side of the uretdione compound produces the precursor to the monomer units of structure (IVc) while the other side produces a monofunctional isocyanate compound.
• a curable coating composition including (a) at least one oligomer (IV) and (b) at least one aminoplast resin crosslinker.
• An aminoplast for purposes of the invention is a material obtained by reaction of an activated nitrogen with a lower molecular weight aldehyde, optionally further reacted with an alcohol (preferably a mono-alcohol with one to four carbon atoms) to form an ether group.
• activated nitrogens are activated amines such as melamine, benzoguanamine, cyclohexylcarboguanamine, and acetoguanamine; ureas, including urea itself, thiourea, ethyleneurea, dihydroxyethyleneurea, and guanylurea; glycoluril; amides, such as dicyandiamide; and carbamate functional compounds having at least one primary carbamate group or at least two secondary carbamate groups.
• the aminoplast resins are in certain embodiments amine/formaldehyde condensates, although other aldehydes, such as acetaldehyde, crotonaldehyde, and benzaldehyde, may be used.
• Non- limiting examples of suitable aminoplast resins include monomelic or polymeric melamine formaldehyde resins, including melamine resins that are partially or fully alkylated using alcohols that typically have one to six, preferably one to four, carbon atoms, such as hexamethoxymethylated melamine; urea-formaldehyde resins including methylol ureas and siloxy ureas such as butylated urea formaldehyde resin, alkylated benzoguanimines, guanyl ureas, guanidines, biguanidines, polyguanidines, and the like.
• Suitable coating compositions may be one, two or multicomponent coating compositions and may be in the form of powder coating compositions, powder slurry coating compositions, waterborne coatings/aqueous dispersions, or solvent borne coating compositions.
• the curable coating composition is a clearcoat coating composition.
• the term "clearcoat” refers to a generally transparent coating layer which is positioned over a basecoat or color coat layer. Furthermore, the clearcoat is generally the outermost coating over the substrate.
• the curable clearcoat coating composition may include a further polymer or oligomer that is also reactive with the aminoplast resin crosslinker. The further polymer or oligomer may have a number average molecular weight of from 600 to 10,000 and may have an equivalent weight, based on active hydrogen groups, of from 32 to 2000.
• Such active hydrogen group containing polymers and oligomers include, for example, acrylic polymers, modified acrylic polymers, polyesters including polylactones, polyurethanes, and polysiloxanes, star ester oligomers, polyurethane oligomers, and natural product oligomers such as dimer-fatty dicarbamate or diol compounds.
• the coating composition used in the method of the invention may include a catalyst to enhance the cure reactions between the oligomer (IV) and the aminoplast resin crosslinker.
• Nonlimiting, suitable examples include para- toluenesulfonic acid, dinonylnaphthalene disulfonic acid, dodecylbenzenesulfonic acid, phenyl acid phosphate, monobutyl maleate, butyl phosphate, and hydroxy phosphate ester. Strong acid catalysts are often blocked, e.g. with an amine. Other catalysts that may be useful in the curable compositions include Lewis acids, zinc salts, and tin salts.
• a solvent or solvents may be included in the coating composition.
• the solvent can be any organic solvent and/or water.
• the solvent includes a polar organic solvent. More preferably, the solvent includes one or more organic solvents selected from polar aliphatic solvents or polar aromatic solvents. Still more preferably, the solvent includes a ketone, ester, acetate, or a combination of any of these. Examples of useful solvents include, without limitation, methyl ethyl ketone, methyl isobutyl ketone, m-amyl acetate, ethylene glycol butyl ether- acetate, propylene glycol monomethyl ether acetate, xylene, N-methylpyrrolidone, blends of aromatic hydrocarbons, and mixtures of these.
• the solvent is water or a mixture of water with small amounts of co- solvents.
• protic solvents such as alcohol and glycol ethers are avoided when the coating composition includes the optional polyisocyanate crosslinker, although small amounts of protic solvents can be used even though it may be expected that some reaction with the isocyanate groups may take place during curing of the coating.
• the coating compositions can be coated on a substrate by spray coating. Electrostatic spraying is a preferred method.
• the coating composition can be applied in one or more passes to provide a film thickness after cure of typically from about 20 to about 100 microns.
• the coating composition can be applied onto many different types of substrates, including metal substrates such as bare steel, phosphated steel, galvanized steel, or aluminum; and non-metallic substrates, such as plastics and composites.
• the substrate may also be any of these materials having upon it already a layer of another coating, such as a layer of an electrodeposited primer, primer surfacer, and/or basecoat, cured or uncured.
• the coating is cured, preferably by exposing the coating layer to heat for a length of time sufficient to cause the reactants to form an insoluble polymeric network.
• the cure temperature is usually from about 105° C. to about 175° C, and the length of cure is usually about 15 minutes to about 60 minutes.
• the coating is cured at about 120° C. to about 150° C. for about 20 to about 30 minutes.
• the coating composition is utilized as the clearcoat of an automotive composite color-plus-clear coating.
• the pigmented basecoat composition over which it is applied may be any of a number of types well- known in the art, and does not require explanation in detail herein.
• Polymers known in the art to be useful in basecoat compositions include acrylics, vinyls, polyurethanes, polycarbonates, polyesters, alkyds, and polysiloxanes.
• Preferred polymers include acrylics and polyurethanes.
• Basecoat polymers may be thermoplastic, but are preferably crosslinkable and comprise one or more type of crosslinkable functional groups.
• Such groups include, for example, hydroxy, isocyanate, amine, epoxy, acrylate, vinyl, silane, and acetoacetate groups. These groups may be masked or blocked in such a way so that they are unblocked and available for the crosslinking reaction under the desired curing conditions, generally elevated temperatures.
• Preferred crosslinkable functional groups include hydroxy functional groups and amino functional groups.
• Basecoat polymers may be self-crosslinkable, or may require a separate crosslinking agent that is reactive with the functional groups of the polymer.
• the crosslinking agent may be an aminoplast resin, isocyanate and blocked isocyanates (including isocyanurates), and acid or anhydride functional crosslinking agents.
• the clearcoat coating composition is generally applied wet-on-wet over a basecoat coating composition as is widely done in the industry.
• the coating compositions are preferably subjected to conditions so as to cure the coating layers as described above.
• the coating composition may also be utilized as a one-layer topcoat or as a basecoat coating.
• a one-layer topcoat or basecoat coating composition includes one or more of the pigments mentioned above, and provides the color and/or metallic effect.
• a curable basecoat coating including the oligomer (IV) may be used with a clearcoat coating composition such as those described in the art, including those containing film forming materials with hydroxyl, carboxyl, epoxide, and/or carbamate groups and crosslinkers including aminoplasts, polyisocyanates, polyepoxides, and polycarboxylic acids.
• the substrate to which the curable coating composition is applied may be an automotive body or part.
• the applied coating composition is then cured to provide a coated automotive body or part.
• N3400 solution 47.39 % non-volatiles, 7.87 g
• Polycin M-365 multiple hydroxyl functional resin, 2.20 g
• zinc acetylacetonate hydrate (0.03 g) were charged to a flask under nitrogen and agitated.
• the mixture was heated to reflux (106°C), the nitrogen flow was removed, and agitated for 4 hr.
• the material showed no signs of gel formation.
• IR shows only the trace appearance of the uretdione peak at 1764 cm "1 .
• Example 2 of the Invention Hydroxy propyl carbamate (HPC, 0.493 mole, 58.7 g), dibutyltin dilaurate (DBTL, Fastcat 4202, 0.00025 mole, 0.16 g), and methyl propyl ketone (MPK, 200 ml) were charged to a flask under nitrogen. While agitating, the mixture was heated to 60°C. A solution of homopolymer of hexamethylene diisocyanate (DESMODUR N 3400, 0.298 mole, 100 g) in MPK (50 ml) was added dropwise to the HPC solution over 1.5 hr. The temperature of the reaction was kept between 60-80°C, and the reaction was monitored by IR. The reaction was deemed complete after 5 hrs by the disappearance of the isocyanate peak by IR.
• HPC Hydroxy propyl carbamate
• DBTL dibutyltin dilaurate
• MPK methyl propyl ketone
• HPC Hydroxy propyl carbamate
• DBTL dibutyltin dilaurate
• MPK methyl propyl ketone
• Example 4A Example 1 (61.94 % nonvolatiles, 5.02 g) was combined with Resimene HM 2608 (melamine crosslinker, 0.58 g) and p-toluenesulfonic acid (0.07g). The mixture was agitated until all materials dissolved. A drawdown of the material was performed utilizing the #4 gap on the draw down bar and applied onto a metal panel. The panel was then placed in an 110"C oven for lhr. to provide a cured coating layer on the panel. [0059] Example 4B.
• Example 1 (61.94 % nonvolatiles, 4.99 g) was combined with Resimene HM 2608 (melamine crosslinker, 0.75 g) and p-toluenesulfonic acid (0.06 g). The mixture was agitated until all materials dissolved. A draw down of the material was performed utilizing the #4 gap on the draw down bar and applied onto a metal panel. The panel was then placed in an 110°C oven for lhr. to provide a cured coating layer on the panel.

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