Stock material or miscellaneous articles – Composite – Of fluorinated addition polymer from unsaturated monomers
Patent
1998-03-12
2000-12-05
Thibodeau, Paul
Stock material or miscellaneous articles
Composite
Of fluorinated addition polymer from unsaturated monomers
428480, 1562726, 1562748, 156332, 427490, 427491, 427536, 427540, B32B 2708, B32B 2736, B32B 3108, B32B 3112, C08J 718
Patent
active
061564346
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a tetrafluoroethylene-perfluoroalkoxyethylene type copolymer (hereinafter referred as PFA) film, a laminate employing it, and a process for producing the laminate.
BACKGROUND ART
A fluorine resin such as PFA is excellent in its chemical resistance and anti-fouling properties, and a laminate having a fluorine resin film laminated on a substrate of metal, plastic or the like, is used in a wide range of fileds, such as floor materials, copy boards, wall papers, roof materials, top plates for gas cooking stoves or hoods of gas ranges. To bond a fluorine resin film such as a PFA film to various substrates, surface treatment to impart physical or chemical modification to the fluorine resin surface will be required to make it wettable with the adhesive, since the surface energy of the fluorine resin is low.
As such surface treatment, corona discharge treatment is commonly known. Further, in order to improve the adhesive property, as a method which may be substituted for corona discharge treatment, a method of RF sputtering under high vacuum and high power density conditions (JP-A-51-125455), a method of RF sputtering in a special gas atmosphere (JP-A-6-285988) and a method of RF sputtering for a long period of time (JP-A-6-298971), have, for example, been proposed. However, with PFA films surface-treated by these methods, the adhesive strength has been practically insufficient.
Accordingly, the object of the present invention is to provide a PFA film which provides a good adhesive strength, a laminate employing such a PFA film, and a process for producing such a laminate.
DISCLOSURE OF THE INVENTION
The present inventors have studied in detail the relation between the adhesive strength and the functional groups on the surface-treated surface of the surface-treated PFA film, and as a result, have found that a PFA film which is a surface-treated PFA film, wherein hydroxyl groups and carbonyl groups are present on the surface-treated film surface, provide excellent adhesive strength.
Accordingly, the present invention provides a PFA film which is a surface-treated PFA film, wherein hydroxyl groups and carbonyl groups are present on the surface-treated film surface.
Further, the present inventors have studied in detail the relation between the adhesive strength and the irregularity state of the film surface of the surface-treated PFA film, and as a result, have found that a PFA film wherein the surface state of the surface-treated film surface is a surface state having substantially no irregularities, has particularly good adhesive strength.
Accordingly, the present invention provides a PFA film which is a surface-treated PFA film, wherein hydroxyl groups and carbonyl groups are present on the surface-treated film surface, and the surface state of the surface-treated film surface is a surface state having substantially no irregularities.
Preferably, the average surface roughness of the surface-treated film surface is at most 10 nm, more preferably at most 6 nm.
Further, the present inventors have conducted an extensive study on the relation between the adhesive strength of the surface-treated PFA film and the amount of fluorine atoms transferred to an adhesive surface of an adhesive tape when the adhesive tape was bonded to the film surface of the surface-treated PFA film and then peeled, and as a result, have found that a PFA film, wherein, when the adhesive surface of an adhesive tape is bonded to the surface-treated film surface, and then the adhesive tape is peeled from the film surface, the amount of fluorine atoms present on the adhesive surface of the adhesive tape after the peeling, is at most twice the amount of fluorine atoms present on an adhesive surface of an adhesive tape when the adhesive surface of the adhesive tape is bonded to the film surface of a PFA film having its surface non-treated, and then, the adhesive tape is peeled from the film surface, has particularly good adhesive strength.
Accordingly, the present invention provides a PFA film w
REFERENCES:
patent: 3296011 (1967-01-01), McBride et al.
patent: 4549921 (1985-10-01), Wolfe, Jr.
patent: 5662972 (1997-09-01), Shimada et al.
Mark et al., Encyclopedia of Polymer Science and Engineering, vol. 9, pp. 598-602, Jan. 1988.
Aruga Hiroshi
Fukawa Makoto
Harada Kazuo
Hayashi Atsushi
Hayashi Yasuo
Asahi Glass Company Ltd.
Thibodeau Paul
Zacharia Ramsey
LandOfFree
Fluorine type film, laminate employing it, and process for produ does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluorine type film, laminate employing it, and process for produ, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluorine type film, laminate employing it, and process for produ will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-959603