Stock material or miscellaneous articles – Composite
Patent
1996-03-18
1997-11-25
Krynski, William
Stock material or miscellaneous articles
Composite
428 401, 428 53, 428195, 428339, 4284884, 428500, 428515, B32B 904
Patent
active
056910649
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The present invention relates to a release film used for moving a part with a pressure-sensitive adhesive attached to the part, and in particular, to a release film for a part with a pressure-sensitive adhesive attached to the part that can be used even in a low temperature atmosphere such as that in the winter season.
For installation of automobile parts, pressure-sensitive adhesive tapes have widely been used because of their cost, simplicity, and the like. These pressure-sensitive adhesive tapes are first attached to the parts to be installed and disposed by juxtaposition on the surface of a release film. To obtain a high adhesive strength, there have hitherto been used pressure-sensitive adhesives with a comparatively high Tg value, specifically, a Tg value of 0.degree. C. or higher. Thus, the automobile parts with a pressure-sensitive adhesive and a release film attached are delivered to automobile manufacturing lines and the like. As the conventional release film used in the above cases or the like, there have been used or known the following release films.
In Japanese Unexamined Patent Publication (Kokai) No. 4-226184, there is disclosed a polyethylene film as a release film. Although this release film has the merit that it is available at a low cost, there has been the problem that its releasability is so high that automobile parts or the like have fallen off at times in an installation step for automobile parts and the like. In particular, there has been the problem that, in a low temperature atmosphere of 5.degree. C. or lower in the winter season, the pressure-sensitive adhesive strength of pressure-sensitive adhesive tapes becomes lowered, which easily results in falling off of parts.
Japanese Unexamined Patent Publication (Kokai) No. 4-77557 discloses a silicone-treated polyester film. Although this film has the advantage that it is comparatively high in mechanical strength and excellent in dimensional stability, there has been caused the problem that owing to the too high releasability, automobile parts have fallen off during the installation process of automobile parts and the like, as in the case of the polyethylene film. This problem has been particularly serious in the winter season. In addition, owing to the wide scatter of the silicone-treatment, there have been caused troubles during the progress of work, or there has been observed the trouble that silicone proceeds into a pressure-sensitive adhesive tape, resulting in lowering of the pressure-sensitive adhesive strength of the pressure-sensitive adhesive tape, and so forth.
In addition, the following release films have been known.
As a fluorine type release film, there have been known release films such as polytetrafluoroethylene (PTFE) and polyvinylidene fluoride. Although these release films are high in releasability, they are so expensive that it has been virtually impossible to use them as process films.
In addition, it has been impossible for these release films to retain an adequate adhesion in conformity with the circumstances such as temperature and the like, and there has been observed the problem that these release films are poor in mechanical strength and, therefore, inferior in processability and handling properties.
Polypropylene films have been known, but, although these films are high in releasability, it has been impossible for releasability to be varied according to the circumstances such as temperature, as in the case of PTFE and the like.
In addition, polyvinyl chloride films have been known, and these films have adequate flexibility and stretchability even at low temperatures, and have the merits that processing such as slitting or the like can easily be done, and that these films are available at a low cost. However, it has been impossible for a polyvinyl chloride film alone to retain an adequate adhesion according to the environmental circumstances such as ambient temperature, as in the case of the aforesaid films. There has also been the problem in a polyvinyl chloride film that a pl
REFERENCES:
patent: 5127974 (1992-07-01), Tomiyama et al.
patent: 5234736 (1993-08-01), Lee
Ogata Kiyoshi
Sato Shinobu
Bardell Scott A.
Griswold Gary L.
Kirn Walter N.
Krynski William
Minnesota Mining and Manufacturing Company
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