Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1997-01-08
2000-05-16
Short, Patricia A.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
427322, 427327, 427379, 4273881, 4273935, 427409, 428332, 428336, 4284231, 4284255, 428461, 428523, B29C 6502
Patent
active
060632305
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to substrates coated with two or more coats, to a process for the production of these substrates and to the use of the substrates coated with two or more coats for the production of automobiles.
BACKGROUND AND SUMMARY OF THE INVENTION
EP-A-374 551 discloses coated substrates which are suitable for the production of fitments for automobile bodies. The coated substrates described in EP-A-374 551 consist of metal panels which are coated with at least one coat, or of composite materials whose surface layer consists of the coated metal panels.
The object of the present invention was to provide substrates coated with two or more layers, which, in relation to the coated substrates disclosed in EP-A-374 551, have improved properties, and in whose production only small quantities of solvents are emitted and simple quality monitoring is possible.
This object is achieved in accordance with the invention by the provision of substrates coated with two or more coats, which are characterized in that they can be produced by the surface of the substrate, if desired, with a filler composition which is suitable for the coating of automobile bodies, respectively, the filler coat obtained after carrying out step B with at least one pigmented coat of is paint, with a transparent coating material, and film which is applied by lamination.
The present invention also relates to a process for the production of substrates coated with two or more coats, which is characterized in that onto the surface of a substrate, coated, if desired, with a filler composition which is suitable for the coating of automobile bodies, the filler coat obtained after carrying out step B is coated with at least one pigmented coat of paint, coated with a transparent coating material, and which is applied by lamination are cured, it being possible for the curing of the filler coat applied in step B to be carried out prior to the coating with at least one pigmented coat of paint, and for the curing of the pigmented coat of paint applied in step C to be carried out prior to the coating with the transparent coating material.
The present invention also relates to the use of the substrates coated in accordance with the invention for the production of motor-vehicle bodies, preferably automobile bodies, and for the production of fitments for motor-vehicle bodies.
DETAILED DESCRIPTION
The coated substrates in accordance with the invention are distinguished by a very high resistance to stone chipping and corrosion. Further advantages of the coated substrates in accordance with the invention consist in the fact that they can be produced in plants occupying little space, that, in the course of the production of the coated substrates in accordance with the invention, by employing a plastics film in step A, only very small quantities of organic solvents are emitted, and that the quality monitoring can begin even with the plastics film employed in step A, whereas when coating materials are employed the quality of the coating cannot be assessed until after the coat of paint has cured, and in the case of quality defects the coated substrate as a whole must be discarded.
In step A of the process for the production of the coated substrates in accordance with the invention it is possible in principle to employ all substrates which are suitable for the production of motor-vehicle bodies and for the production of fitments for motor-vehicle bodies. Examples are optionally pretreated metal panels, for example optionally pretreated steel panels and aluminum panels, and also moldings of plastic. It is preferred to employ moldings of plastic, and very particularly preferred to employ optionally pretreated metal panels, especially optionally pretreated steel panels, as substrates. The metal panels can be pretreated, for example, by phosphatizing and/or chromatizing.
In step A, it is possible to employ a film of a polyolefin, a polyamide, a polyurethane, a polyester, a polyacrylate, a polycarbonate or a mixture of different po
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patent: 4751121 (1988-06-01), Kuhnel
patent: 4917944 (1990-04-01), Breitscheidel
patent: 5047294 (1991-09-01), Schwab
patent: 5169922 (1992-12-01), Hille
patent: 5268215 (1993-12-01), Krenceski et al.
patent: 5368944 (1994-11-01), Hartung
patent: 5490893 (1996-02-01), Enlow
Kiriazis Leonidas
Wegner Egon
BASF Coatings AG
Short Patricia A.
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