Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
  • B05D7/50—Multilayers
  • B05D7/52—Two layers
  • B05D7/53—Base coat plus clear coat type
  • B05D7/532—Base coat plus clear coat type the two layers being cured or baked together, i.e. wet on wet
• • 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
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3225—Polyamines
• • 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
  • C08G18/30—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
  • C08G18/3821—Carboxylic acids; Esters thereof with monohydroxyl compounds

Definitions

• the invention relates to coating compositions which are particularly suitable for producing the base layer of two-coat coatings of the basecoat / clearcoat type and which comprise organic diluents, at least one synthetic resin containing urethane and urea groups,
• Basecoat / Clearcoat lacquers are produced by pre-painting a pigmented basecoat and a short flash-off time without a baking step (wet-on-wet
• a metal effect basecoat which can be processed in the wet-on-wet process must accordingly provide paint films in which the metal pigments are present in a favorable spatial orientation after application and in which this orientation is quickly fixed in such a way that it is fixed in the course of the further painting process not disturbed - can be.
• EP-A-137 256 discloses coating compositions for producing the base layer of two-coat coatings of the basecoat / clearcoat type, which contain polyurethane and / or polyurea elastomers as binder components.
• the coating compositions disclosed in EP-A-137 256 can be used to produce two-coat coatings, in particular two-coat metallic effect coatings, which have a good metallic effect, good adhesion and excellent stone chip resistance.
• the object of the present invention was to provide coating compositions for the production of the base layer of two-coat coatings of the basecoat / clearcoat type which do not have the disadvantages set out above.
• compositions according to the preamble of the main claim which are characterized in that they contain at least -T Q a urethane and urea group-containing synthetic resin which can be obtained by
• 35-containing a3) component can be produced and then lead to good base layers without the addition of polyol components. It can also be tough Polyester segments are incorporated into the synthetic resin molecule without incompatibility phenomena when amino resins are added.
• the coating compositions according to the invention also show the advantages of the coating compositions disclosed in EP-A-137 256.
• the resin containing urethane and urea groups contained in the coating compositions according to the invention can be obtained by al) - a compound which carries two hydroxyl groups which are reactive towards isocyanate groups and a2) an aliphatic and / or cycloaliphatic di-isocyanate to form a prepolymer containing isocyanate groups ( A) are reacted and the isocyanate groups of the prepolymer (A) then at least partly with a3) an adduct containing at least one active amine hydrogen atom from a (meth) acrylic acid ester, preferably acrylic acid ester, and at least two amine hydrogen atoms containing aliphatic or cycloaliphatic compound.
• diols suitable for the production of polyurethane lacquer resins can be used as component a1). These diols can be of low molecular weight; however, diols with a higher molecular weight can also be used. Examples of low molecular weight diols are glycols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, butanediol, neopentyl glycol and 1,6-hexanediol.
• Polyether and polyester diols are mentioned as examples of higher molecular weight diols.
• Suitable polyether diols are poly (oxyaikylene) diols such as poly (oxytetramethylene) glycol, poly (oxyethylene) glycol, poly (oxypropylene) glycol, etc.
• Polyester diols are preferably used as component a1). Such polyester diols can be obtained by esterification of organic dicarboxylic acids or their anhydrides with organic diols.
• Diols commonly used in the manufacture of such polyesters include alkylene glycols such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol and neopentylglykoi and other glycols such as hydrogenated bisphenoi-A, cyclohexane dimethanol, caprolactone diol (e.g. the reaction product of ⁇ - Caprolactone and ethylene glycol), hydroxyalkylated bisphenols, polyether glycols, e.g. Poly (oxytetramethylene) glycol and the like However, other diols can also be used.
• alkylene glycols such as ethylene glycol, propylene glycol, butylene glycol, hexylene glycol and neopentylgly
• the acid component of the polyester diols usually consists of dicarboxylic acids or their anhydrides with 2 to 18 carbon atoms per molecule.
• suitable acids are phthalic acid, isophthalic acid, terephthalic acid, tetrahydrophthalic acid, hexahydrophthalic acid, adipic acid, azelaic acid, sebacic acid, maleic acid, glutaric acid, hexachlorheptenedicarboxylic acid, tetrachlorophthalic acid and other dicarboxylic acids of various types. Parts of the acids can of course also be used in the corresponding anhydrides.
• Polyester diols are particularly preferably used as component a1) which contain isophthalic acid as the acid component and which have an average molecular weight (number average) of 400 to 2000.
• component a1 Mixtures of different diols, for example mixtures of a polyester diol and a low molecular weight diol, can of course also be used as component a1).
• all aliphatic and / or cycloaliphatic diisocyanates suitable for the production of polyurethane lacquer resins can be used as component a2). Numerous such diisocyanates are known.
• diisocyanates examples include 1,4-tetramethylene diisocyanate, hexamethylene diisocyanate, 2,2,4-trimethylhexane-1, 6-diisocyanate, isophore diisocyanate, bis (isocyanatocyclohexyl) methane and methylcyclohexyl diisocyanate.
• adducts are acryl Textreestern of (meth) and aliphatic and / or cycloaliphatic compounds, ⁇ - the at least two Aminementstoffato e contain setshim ⁇ . These adducts must contain at least one amine hydrogen atom which is reactive towards isocyanate groups (a so-called active). The number of active amine hydrogen atoms must be chosen so that no crosslinked synthetic resins are obtained. In general, adducts 0 with 1 to 3 active amine hydrogen atoms are used as a3) component. Adducts with two active amine hydrogen atoms are preferably used.
• the adducts 5 used as component a3) are prepared in a simple manner by reacting an aliphatic and / or cycloaliphatic compound which contains at least two hydrogen amines with (meth) acrylic acid esters.
• the addition reaction can be carried out in the melt or in solution at temperatures between 20 and 120 C, preferably below 0 50 C. In most cases, the implementation is exothermic.
• the adducts used as component a3) are advantageously prepared by initially introducing the compound which contains at least two hydrogen amines in a suitable solvent and metering in the 5 (meth) acrylic ester with stirring so that the reaction temperature does not exceed 50.degree. ] _ Both methacrylic acid and acrylic acid esters can be used to produce component a3).
• Acrylic acid esters are preferably used.
• examples of usable (meth) acrylic acid esters are ethyl (meth) acrylate, methyl (meth) - c acrylate, propyl (meth) acrylate, butyl (meth) acrylate and 2-ethylhexyl (meth) acrylate.
• Hydroxyl-containing (meth) acrylic acid esters in particular hydroxyl-containing alkyl 0 (meth) acrylates, are advantageously used.
• Hydroxyl-containing alkyl (meth) acrylates whose alcohol component has at least 4 carbon atoms are very particularly preferably used.
• hydroxyl-containing alkyl (meth) acrylates examples include 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate and 4-hydroxybutyl (meth) acrylate 5, and in particular a reaction product made from one mole of hydroxyalkyl (meth) acrylate , preferably hydroxyalkyl acrylate, especially hydroxyethyl acrylate and 1 to 3, preferably 2 moles of caprolactone.
• Component a3) is prepared by reacting the (meth) acrylic acid esters described above with a compound which contains at least two amine hydrogen atoms.
• the reaction conditions and the type and amount of the compound which contains at least two amine hydrogen atoms must be selected such that the resulting adduct contains at least 1, preferably 1 to 3, active amine hydrogen atoms.
• Examples of compounds which contain at least two amine hydrogens 0 are ethylenediamine, 1,2- or 1,3-propylenediamine, 1,6-hexanediamine, 2-methyl-l, 6-hexanediamine, 1-methyl-2,4 -diamino-cyclohexane, l-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, 1,3- or 1,4-bisaminomethylcyclohexane or 4,4'-diamine inodicyclohexylmethane can be used. 5 Preference is given to using compounds which contain primary amino groups.
• the synthetic resin containing urethane and urea groups contained in the coating compositions according to the invention is advantageously prepared by first reacting components a1) and a2) to form a prepolymer (A) containing isocyanate groups.
• This reaction can be carried out according to the well known methods of polyurethane chemistry.
• Components a1) and a2) are preferably reacted in an inert organic solvent (for example toluene, xylene, ethyl or butyl acetate).
• components a1) and a2) are preferably reacted in amounts such that the molar ratio of a1) to a2) is 0.5: 1.0 to 0.9: 1.0.
• the adduct a3) is prepared in a separate reaction vessel in the manner described above.
• the 5 completion of the synthetic resin according to the invention can then be carried out by slowly adding the prepolymer (A) to the adduct a3).
• the proportions of prepolymer (A) ' to component a3) are preferably chosen so that there are 1 to 2 active amine hydrogen atoms per isocyanate group.
• a coating composition which is suitable as a base coating composition for basecoat / clearcoat coatings can be produced from the above-described synthetic resin containing urethane and urea groups according to the invention.
• the coating compositions according to the invention contain customary organic diluents, possibly further synthetic resins, pigments and other generally customary additives.
• the organic diluents contained in the coating compositions according to the invention can consist of volatile organic liquids or mixtures of liquids which are usually used as polymer solvents or polymer dispersants in coating compositions.
• volatile organic liquids or mixtures of liquids which are usually used as polymer solvents or polymer dispersants in coating compositions.
• examples include: Aliphatic hydrocarbon Fe, for example hexane and heptane, aromatic hydrocarbons, such as toluene and xylene, and petroleum fractions with different boiling points, which are predominantly aliphatic but have a substantial aromatic content, esters, for example butyl acetate, ethyl glycol diacetate and 2-ethoxyethyl acetate, Ketones, for example acetone and methyl isobutyl ketone, and alcohols, for example butyl alcohol.
• Aliphatic hydrocarbon Fe for example hexane and heptane
• aromatic hydrocarbons such as toluene and
• polyesters described in EP-A-137,256 are mentioned as an example of synthetic resins which can be contained in the coating compositions according to the invention in addition to the synthetic resin according to the invention.
• the coating compositions of the invention contained, g "th advantageously a crosslinking agent.
• Linking agents as Vernet ⁇ can, for example amino resins, phenolic resins or blocked polyisocyanates. Preferred are amino resins such as condensates of form-aldehyde with Meiamin, urea or benzoguanamineLe ⁇ 0 sets. These amino resins often contain methylol or similar alkylol groups, which are preferably at least partially etherified with an alcohol.
• the coating compositions according to the invention preferably contain 5 to 40 to 80% by weight, particularly preferably 55 to 65% by weight, of the synthetic resin according to the invention containing urethane and urea groups, based on the binder solid.
• the coating compositions according to the invention can contain all pigments which are suitable for basecoat / clearcoat coating. Coating compositions which contain metal flake pigments, preferably aluminum flakes, individually or in a mixture are particularly preferred. In addition to the metal flake pigment, the preferred coating compositions can also contain further coloring, non-metallic pigments.
• the coating compositions according to the invention can also contain other conventional additives such as fillers, plasticizers, _ Stabilizers, wetting agents, dispersing agents, leveling agents, defoamers and catalysts individually or in a mixture in the usual amounts.
• additives such as fillers, plasticizers, _ Stabilizers, wetting agents, dispersing agents, leveling agents, defoamers and catalysts individually or in a mixture in the usual amounts.
• the coating compositions according to the invention can also contain crosslinked polymer microparticles and / or a copolymer which consists of 85 to 95% by weight of ethylene and 15 to 5% by weight
• Suitable polymer microparticles are e.g. in EP 29637 A2
• the invention also relates to a method for producing a multilayer, protective and / or decorative coating on a substrate surface, wherein '
• a coating composition as the base coating composition. is applied, the organic diluents, at least one synthetic resin containing urethane and urea groups, pigments, possibly further synthetic resins and other generally customary additives
• a polymer film is formed on the substrate surface from the coating composition applied in step (1), 5 (3) a suitable transparent cover layer composition is applied to the base layer thus obtained, and then
• the base coating composition contains at least one synthetic resin containing urethane and urea groups, which can be obtained by al) a compound which carries two hydroxyl groups which are reactive towards isocyanate groups and a2) an aliphatic and / or cycloaliphatic diisocyanate nat are converted into an isocyanate group-containing prepolymer (A) and the isocyanate groups of the prepolymer (A) are then at least partially composed of an adduct containing at least one active amine hydrogen atom with a3) .
• a (meth) acrylic acid ester preferably acrylic acid ester, and an aliphatic or cycloaliphatic compound containing at least two amine hydrogen atoms.
• a coating composition as described above is applied as the base coating composition in the first step.
• the resulting base layer is overpainted with a transparent cover layer composition after a short flash-off time without a baking step (in the wet-on-wet method). Finally, the base layer and cover layer are baked together.
• top layer compositions which are not pigmented or only transparent pigmented are suitable as top layer compositions.
• These can be conventional solvent-borne clearcoats, water-thinnable clearcoats or powder clearcoats.
• Pre-treated metal substrates are particularly suitable as substrates to be coated, but non-pretreated metals and any other substrates, such as e.g. Wood and plastic, are coated with a basecoat / clearcoat coating according to the inventive method.
• the invention also relates to a substrate which has been coated by the method described above.
• the invention also relates to urethane and Harnstöff phenomenon containing synthetic resins which are characterized in that they -are obtainable by al) a compound having two isocyanate-reactive hydroxyl groups and bears' , a2) an aliphatic and / or cycloaliphatic diisocyanate are converted into a prepolymer (A) containing isocyanate groups, and the isocyanate groups of the prepolymer (A) are then at least partly with a3) an adduct from at least one active amine hydrogen atom (Meth) acrylic acid esters, preferably acrylic acid esters, and an aliphatic or cyclo 0 aliphatic compound containing at least two amine hydrogen atoms.
• a2 an aliphatic and / or cycloaliphatic diisocyanate
• the invention also relates to a process for the preparation of synthetic resins containing urethane and urea groups, which is characterized in that a) a compound which carries two hydroxyl groups which are reactive toward isocyanate groups and a2) an aliphatic and / or cycloaliphatic diisocyanate to form a prepolymer containing isocyanate groups (A ) are reacted and the isocyanate groups of the prepolymer (A) then at least partially with a3) an adduct containing at least one active amine hydrogen atom from a (meth) acrylic acid ester, preferably acrylic acid ester, and at least two amine wasocyanates ⁇ Aliphatic or cycloaliphatic compound containing hydrogen atoms are reacted.
• the base coating compositions prepared in accordance with point -5 are sprayed with a gravity cup gun onto body panels painted with a conventional primer and a filler layer in such a way that 0 results in a dry film thickness of the base lacquers of 12 to 17 ⁇ m.
• the lacquers produced with standard clear lacquer are baked for 20 minutes at 140 ° C. and the lacquers produced with repair clear lacquer for 20 minutes at 80 ° C.
• Goniophotometer GP2 company CARL ZEISS
• a pronounced metallic effect is present when the HA value is high and the HS value is low.
• a measure of the metallic effect is obtained according to the following formula: 5
• Base Coating Composition 1 Base Coating Composition 2 Base Coating Composition 3 Comparative Example

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• Chemical & Material Sciences (AREA)
• Health & Medical Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Medicinal Chemistry (AREA)
• Polymers & Plastics (AREA)
• Organic Chemistry (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Wood Science & Technology (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Paints Or Removers (AREA)
• Laminated Bodies (AREA)

Applications Claiming Priority (2)

Publications (1)

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ID=6333007

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Family Applications After (1)

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• 1987
  • 1987-08-04 DE DE3725784A patent/DE3725784A1/de not_active Withdrawn
• 1988
  • 1988-07-19 DE DE8888111599T patent/DE3875420D1/de not_active Expired - Lifetime
  • 1988-07-19 AT AT88111599T patent/ATE81661T1/de not_active IP Right Cessation
  • 1988-07-19 EP EP88905834A patent/EP0377570A1/de active Pending
  • 1988-07-19 BR BR888807639A patent/BR8807639A/pt not_active IP Right Cessation
  • 1988-07-19 JP JP63505874A patent/JPH06102769B2/ja not_active Expired - Lifetime
  • 1988-07-19 WO PCT/EP1988/000650 patent/WO1989001004A1/de not_active Application Discontinuation
  • 1988-07-19 ES ES198888111599T patent/ES2035180T3/es not_active Expired - Lifetime
  • 1988-07-19 EP EP88111599A patent/EP0302296B1/de not_active Expired - Lifetime
  • 1988-07-19 US US06/445,610 patent/US5169922A/en not_active Expired - Fee Related
  • 1988-07-21 ZA ZA885292A patent/ZA885292B/xx unknown
  • 1988-08-03 CA CA000573675A patent/CA1334038C/en not_active Expired - Fee Related

Non-Patent Citations (1)

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