Films for coating shaped-part blanks and the use thereof in auto

Details Films for coating shaped-part blanks and the use thereof in auto Films for coating shaped-part blanks and the use thereof in auto

1998-03-10

2000-03-14

Dixon, Merrick

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

428213, 428215, 428332, 428500, 428520, 428522, 428480, 4284233, B32B 516

Patent

active

06037053&

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to films for coating molding blanks, 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 built-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 coated metal panels.
P 4424290.9 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 build-on parts for vehicle bodies.
The object of the present invention was to provide films for coating molding blanks, which after the deformation of the coated molding blanks have improved properties relative to the coated substrates disclosed in E-A-374 551, and in whose preparation only small amounts solvent are emitted and simple quality monitoring is possible.
This object is achieved in accordance with the invention by the provision of films, wherein from 10 to 500 .mu.m, film, and film or with a transparent varnish coat, either of which may be provided with special-effect pigments. of the base film, the transparent plastic film or the clearcoat.
The present invention also relates to a process for preparing a film coated with two or more coats, where the surface of a pigmented plastic film having a thickness of from 10 to 500 .mu.m is coated with a transparent plastic film or transparent varnish coat, an additional effect coat is applied, if desired, before the application of the transparent film or varnish coat, and the varnish coat applied to the surface of the pigmented plastic film, or the varnish coats applied, are cured.
A film which can be peeled off is applied, if desired, to the uncoated side of the base film and/or to the transparent plastic film or transparent varnish coat.
A further subject of the present invention is the use of the novel films for coating molding blanks to produce car bodies, and to produce build-on parts for vehicle bodies. Consequently, it is preferred in accordance with the invention to employ coating materials which are suitable for car bodies, provided they have sufficient flexibility for the purposes of the invention.
In a further process variant, the pigmented film can be laminated first of all onto the undeformed substrate, for example a metal panel, which can then be deformed. In this way, if desired, the effect coat is applied. Finally, coating with the transparent varnish or with the transparent film takes place.
The bodywork coated with the novel films is 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, that, owing to the use of plastic films for the coating of bodywork in accordance with the invention, only very small amounts of organic solvent are emitted, and that quality monitoring begins with preparation of the 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 thermo plastics which are suitable. The base film can consist of a polyolefin, a polyamide, a polyurethane, a polyester, a polyacrylate, a polycarbonate or a mixture of different polymeric substances, can have a thickness of 10-500, preferably 20-250 .mu.m, and comprises dyes and/or pigments.
Corresponding materials can be employed for the films which can be peeled off.
To the surface of the pigmented plastic film there is applied if desired --as already mentioned --an effect coat, prior to the application of the transparent film or transparent varnish coat. This can be a further film of a very low level of pigmentation, or a

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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