Films provided with several coating layers and the use thereof i

Details Films provided with several coating layers and the use thereof i Films provided with several coating layers and the use thereof i

1998-03-10

2000-10-17

Dixon, Merrick

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428332, 4284237, 428213, 428216, B32B 516

Patent

active

061328642

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to films coated with two or more coats, to a process for preparing these films, and to the use of the films in automotive construction
EP-A-374 551 discloses coated substrates which are suitable for producing add-on parts for car bodies. The coated substrates described in EP-A-374 551 consist of metal panels which have been coated with at least one paint coat or of composite materials whose surface layer consists of the coated metal panels.
P4424290.9 discloses substrates coated with two or more coats. These substrates are deformed and are processed further if desired with the aid of additional materials. In this way it is possible to produce add-on parts for vehicle bodies.
The object of the present invention was to provide films, coated with two or more coats, which can be applied to molding blanks, preferably metal panels prior to their deformation, which have improved properties following the deformation of the blanks, relative to the coated substrates disclosed in EP-A-374 551, and in whose preparation only small amounts of solvent are emitted and simple quality monitoring is possible.
This object is achieved in accordance with the invention by the provision of films coated with two or more coats, wherein is coated if desired with a filler composition, least one pigmented paint coat, film.
A film which can be peeled off is applied if desired onto the transparent plastic film and/or the pigmented paint coat and/or the uncoated side of the base film.
The present invention also relates to a process for preparing a film coated with two or more coats, which comprises 500 .mu.m, if desired, with a filler composition suitable for coating car bodies, least one pigmented paint coat, transparent plastic film, and filler coat applied to the surface of the plastic film.
In this process, the curing of the filler coat applied in step A can be carried out before overcoating with at least one pigmented paint coat, and the curing of the pigmented paint coat applied in step B can be carried out before applying the transparent plastic film. If desired, a protective film which can be peeled off can be applied after step C or D.
A further subject of the present invention is the use of the novel coated films for coating molding blanks to produce vehicle bodies, preferably car bodies, and to produce build-on parts for vehicle bodies. Consequently, it is preferred in accordance with the invention to employ coating materials and filler compositions which are suitable for car bodies, provided they have sufficient flexibility for the purposes of the invention, i.e. provided the cured coating systems have T-bend values of .ltoreq.3.0 preferably .ltoreq.2.0 and, with particular preference, .ltoreq.1.0.
The car bodies coated with the novel films are notable for very high resistance to stone chipping and corrosion. Further advantages of the novel coated films are that they can be produced on installations requiring little space. Moreover, owing to the use of painted plastic films for the coating of bodywork, only very small amounts of organic solvent are emitted. Advantageously, therefore, quality monitoring begins with the painted plastic film, whereas in the case of conventional painting of metal panels the quality of the coating cannot be assessed until after the application of the coats of paint to the substrate, and in the case of quality defects the painted substrate as a whole has to be discarded.
In the preparation of the novel films it is primarily thermoplastics which are suitable. In step A it is possible to employ a film made from a polyolefin, a polyamide, a polyurethane, a polyester, a polyacrylate, a polycarbonate or a mixture of different polymeric substances. The plastic film employed in step A has a thickness of 10-500, preferably 20-250 .mu.m and may comprise dyes and/or pigments.
Corresponding materials can also be employed as a film which can be peeled off.
Insofar as the plastic film is employed for use for vehicle bodies and for that purpose is additionally to be coated with a fi

REFERENCES:
patent: 3968309 (1976-07-01), Matsuo et al.
patent: 4933237 (1990-06-01), Krenceski et al.
patent: 5030514 (1991-07-01), Hartman
patent: 5100732 (1992-03-01), Benefiel
patent: 5268215 (1993-12-01), Krenceski et al.

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