Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets

Definitions

• the present invention relates to a film, its use, a method for producing coatings on substrates, and coatings and coated objects.
• Self-supporting lacquer films and foils have special advantages for the user compared to the production of coatings using liquid casting and spray lacquers, powder slurries and powder lacquers. So they can be handled easily. No complex transport containers and application and suction systems are required for their transport and application. It would therefore be desirable to also transfer these known advantages of the self-supporting lacquer films or foils to the coating of three-dimensional objects.
• DE 196 28 966 C1 proposes a method of applying paint film to three-dimensionally curved surfaces of dimensionally stable substrates.
• a lacquer with a glass transition temperature Tg below 40 ° C., in particular below 30 ° C., and to heat the lacquer film when it is applied to the substrate to the glass transition temperature Tg or just above it. This softens the paint film and clings well to the shaped surfaces.
• Tg glass transition temperature
• Tg glass transition temperature
• the object of the present invention is to find new lacquer films or films which no longer have the disadvantages of the prior art and which make it possible not only to coat the surface of planar substrates but also three-dimensional objects with a pronounced surface profile without using there is a risk of damage to the paint film or the substrate. Furthermore, it is the object of the present invention to find a new method for coating three-dimensional objects which, even on strongly profiled surfaces, provides flawless, firmly adhering, homogeneous coatings of uniform thickness.
• the loss factor tan ⁇ at ambient temperature TU after heating the film and / or irradiating it with actinic radiation is ⁇ 0.1 and where (1.6) the loss factor tan ⁇ is measured using dynamic mechanical thermal analysis (DMTA) on homogeneous free films with a layer thickness of 40 ⁇ 10 ⁇ m;
• DMTA dynamic mechanical thermal analysis
• T UM ⁇ T N U preferably T U M ⁇ T N u;
• the new process for producing a coating by applying a film to a primed or unprimed substrate is referred to as the “process according to the invention” for the sake of brevity.
• the film according to the invention can be easily laminated onto comparatively complex three-dimensional objects or substrates without being damaged or even torn. It nestles against the unevenness and / or roughness of the objects both in the micro and in the macro range and covers them without the film according to the invention having to be heated or a high pressure having to be exerted on it. For this reason, substrates which are thermally sensitive and / or sensitive to the action of mechanical energy can also be coated without the substrates being damaged. After heating and / or irradiation of the laminated film according to the invention, a perfect, firmly adhering, flexible and scratch-resistant, homogeneous coating of uniform thickness results even on strongly profiled and / or very rough substrates.
• the loss factor tan ⁇ is measured using dynamic mechanical thermal analysis (DMTA) on homogeneous free foils with a layer thickness of 40 ⁇ 10 ⁇ m.
• DMTA dynamic mechanical thermal analysis
• a viscoelastic material such as e.g. one
• the polymer part of the energy to be recovered (elastic part) is determined by the size of the storage module E ', while the (dissipated) energy part consumed in this process is determined by the size of the Loss module E "is described.
• the modules E 'and E" are dependent on the rate of deformation and the temperature.
• the loss factor tan ⁇ is defined as the quotient of the loss module E “and the memory module E '.
• the dynamic mechanical thermal analysis (DMTA) used to determine the loss factor tan ⁇ is a generally known measurement method for determining the viscoelastic properties of coatings and is described, for example, in Murayama, T., Dynamic Mechanical Analysis of Polymeric Materials, Elsevier, New York, 1978 and Loren W. Hill, Journal of Coatings Technology, Vol. 64, No. 808, May 1992, pages 3 1 to 33.
• the measurements can be carried out, for example, using the MK II, MK III or MK IV devices from Rheometrics Scientific (Piscataway, New Jersey, USA).
• the free films according to the invention are produced, for example, by applying and curing the starting materials on substrates to which the starting materials and the films resulting therefrom do not adhere. Glass, Teflon and in particular polypropylene may be mentioned as examples of suitable substrates. Polypropylene has the advantage of good availability and is therefore normally used as a carrier material.
• the free films according to the invention can also be produced by other customary and known methods of film production, for example by calendering or blow molding.
• the film according to the invention has a first glass transition temperature Tgi, the maximum loss factor tan ⁇ max of between -20 and 70 ° C.
• the loss factor tan ⁇ must, according to the invention, be at ambient temperatures T M > 0.1.
• the film according to the invention has a high plastic portion of the molecular network at ambient temperatures T UM , so that the film according to the invention can be laminated to primed or unprimed substrates without problems at these temperatures, without having to be heated.
• the ambient temperature T UM is understood to mean a temperature between 0 and 50, preferably 15 and 45 and particularly preferably 20 and 35 ° C., but in particular the room temperature.
• the application of the film according to the invention can be carried out at temperatures such as are usually seasonal in the open air or in factory halls, in particular on the line of a motor vehicle factory, or in workshops, in particular a paint shop, without special heating devices being provided should be.
• the ambient temperature T M is also the application temperature.
• the film according to the invention also has at least one further glass transition temperature Tg n , the maximum loss factor tan ⁇ max of which is above the usage temperatures TN U. According to the invention, it is sufficient if the film according to the invention has a second glass transition temperature Tg 2 .
• the usage temperature T NU is equal to the ambient temperature T UM - In most cases, however, the usage temperature T NU is above the ambient temperature T UM or the application temperature. This is particularly the case when the coatings produced with the aid of the film according to the invention are exposed to the action of heat and / or radiation. This is the case, for example, for exterior applications on automobiles or buildings, in particular in summer, or for applications in the field of motors, heaters, lamps or other energy sources.
• the maximum loss factor tan ⁇ max of the second glass transition temperature Tg 2 and, if appropriate, any further glass transition temperature Tg n is above 70 ° C., preferably above 80 ° C. and in particular above 100 ° C.
• the material of the film according to the invention is designed such that after heating and / or irradiation with actinic radiation at ambient temperature T M it has a loss factor tan ⁇ ⁇ 0.1, preferably ⁇ 0.05. This means that after heating and / or irradiation with actinic radiation, the molecular network of the film according to the invention has practically no plastic component at these temperatures.
• This behavior of the film according to the invention can be adjusted, for example, by incorporating components into conventional and known films, which on the one hand act as plasticizers and on the other hand can be cured thermally and / or with actinic radiation or can be removed from the film according to the invention, for example by evaporation.
• components of this type are known from the technological fields of thermoplastic and thermosetting plastics, photopolymers, adhesives and coating materials curable thermally and / or with actinic radiation.
• Binders such as linear and / or branched and / or block-like, comb-like and / or randomly constructed poly (meth) acrylates or acrylate copolymers, polyesters, alkyds, airinoplast resins, polyurethanes, acrylated polyurethanes, acrylated polyesters, polylactones, polycarbonates, polyethers, epoxy resin -Ainine adducts, (meth) acrylate diols, partially saponified polyvinyl esters or
• Polyureas in particular containing thio, Aj-nino, hydroxy, carbamate, allophanate, carboxy, and / or (meth) acrylate groups, and
• Crosslinking agents which contain, in particular, anhydride, carboxy, epoxy, free and blocked isocyanate, urethane, methylol, methylol ether, siloxane, amino, hydroxy and / or beta-hydroxyalkylamide groups,
• radiation-curable binders such as (mem) acrylic - functional
• the film according to the invention can contain components which give color and / or other optical effects such as metallic effects, dichroic effects, photochromic effects and / or pearlescent effects and / or polarize and / or absorb light.
• Such components are also known from the above-mentioned technological areas and optics.
• the film according to the invention is outstandingly suitable for the method according to the invention, in which it is applied to primed or unprimed substrates.
• all surfaces of objects to be painted are considered as substrates which are accessible to hardening of the paint layer located thereon using heat and / or actinic radiation.
• the film according to the invention and the method according to the invention are highly suitable for applications in the coating of motor vehicle bodies, furniture, industrial components, including coils, containers, packaging and objects of daily use, and buildings indoors and outdoors.
• the film according to the invention and the method according to the invention are suitable for coating practically all parts for private or industrial use, such as radiators, household appliances, small parts made of metal, wheel caps or rims.
• the film according to the invention and the method according to the invention are outstandingly suitable for the protective and / or decorative coating of walls, roofs, windows, railings or doors.
• the film according to the invention can be used to produce coatings which act to protect against corrosion, absorb mechanical energy, are color and / or effect-giving in the sense described above or have the function of a clear coat.
• the usual and known electrocoating materials are suitable as primers for the substrates in question.
• the films according to the invention and of the process according to the invention can be used excellently for the production of color and / or effect multi-layer coatings, in which they contain the filler or the stone chip protection primer and / or the color and / or effect-giving basecoat and / or the clearcoat or, alternatively, the filler or the stone chip protection primer and / or the coloring and / or effect-giving solid-color finish.
• the film according to the invention and the method according to the invention are suitable for the production of coatings on primed or unprimed plastics such as, for. B. ABS, AMMA, ASA, CA, CAB, EP, UF, CF, MF, MPF, PF, PAN, PA, PE, HDPE, LDPE, LLDPE, UHMWPE, PET, PMMA, PP, PS, SB, PUR, PVC, RF, SAN, PBT, PPE, POM, PUR-RIM, SMC, BMC, PP-EPDM and UP (short names according to DIN 7728T1).
• the plastics can of course also be polymer blends, modified plastics or fiber-reinforced plastics.
• the plastics typically used in vehicle construction, in particular motor vehicle construction, can also be used.
• the plastics can be provided with a hydro primer before the coating or subjected to a pretreatment with plasma or by flame treatment.
• the film according to the invention is heated and / or irradiated with actinic radiation in the process according to the invention.
• the heating can take place by contacting the film with gases, liquids and / or solids which have been heated to the required temperature.
• Devices that are suitable for this are common and known. Examples include blowers, immersion baths or presses.
• the heating can also be carried out by irradiation with IR radiation, for which the customary and known radiant heaters or IR lamps can be considered.
• Irradiation with actinic radiation can be carried out with UV light, X-rays and / or gamma radiation and / or corpuscular radiation, in particular electron radiation. Radiation sources which are suitable for this are also customary and known.
• the two methods can be used individually in the context of the method according to the invention, i. that is, the film according to the invention is either heated or irradiated, or they can be combined with one another. In this case they can be used simultaneously or alternately.
• Coatings can be coated with additional layers of paint. They can also be used as primers on the above substrates Come into consideration. Because of the advantageous property profile of the coatings according to the invention, they also have special advantages in this function, such as good interlayer adhesion and excellent surface smoothness.
• the usual and known, thermally and / or actinic radiation-curable powder coatings, powder slurry coatings and / or aqueous or solvent-based one-component or multi-component spray coatings and / or the films according to the invention are suitable for overcoating.
• the resulting coatings always have excellent interlayer adhesion.
• the coatings according to the invention also adhere firmly to the surface of the substrates not only in their planar but also in their folded areas. They are free of cracks, pin holes, craters, orange peel structures and specks. They therefore have an extremely smooth, interference-free surface of extremely high optical quality. They are weather-resistant, hard and scratch-proof and at the same time so flexible that they show good reflow behavior. Because of their extremely variable material composition, they can be easily adapted to the demands of the market at any time. In all of the uses described above, they show an excellent property profile. Accordingly, the articles which contain at least one coating according to the invention are of particularly high utility value and have a long service life.

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

Applications Claiming Priority (3)

Publications (1)

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Family Applications (1)

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• 1999
  • 1999-06-21 DE DE1999128253 patent/DE19928253C2/de not_active Expired - Fee Related
• 2000
  • 2000-06-21 BR BR0011837-0A patent/BR0011837A/pt not_active IP Right Cessation
  • 2000-06-21 JP JP2001505601A patent/JP2003503523A/ja active Pending
  • 2000-06-21 MX MXPA01012744A patent/MXPA01012744A/es unknown
  • 2000-06-21 EP EP00940391A patent/EP1214370A1/fr not_active Withdrawn
  • 2000-06-21 WO PCT/EP2000/005700 patent/WO2000078847A2/fr not_active Ceased
  • 2000-06-21 AU AU55339/00A patent/AU5533900A/en not_active Abandoned
  • 2000-06-21 CA CA002376981A patent/CA2376981A1/fr not_active Abandoned

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