Synthetic resins or natural rubbers -- part of the class 520 ser – Synthetic resins – Processes of preparing a desired or intentional composition...
Patent
1996-12-19
1997-11-04
Cain, Edward J.
Synthetic resins or natural rubbers -- part of the class 520 ser
Synthetic resins
Processes of preparing a desired or intentional composition...
522 2, 522 31, 522 63, 522 64, 522 65, 522 75, 522 76, 522 78, C08J 328
Patent
active
056840659
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to techniques for surface modification of a fluorine-containing resin molded article by irradiation of a laser beam to enhance its adhesion, printing properties and affinity with other compounds.
BACKGROUND ART
A fluorine-containing resin is excellent in heat resistance, chemical resistance, weather resistance and the like, and is used widely in the medical, electronic and chemical fields, field of precision instrument, etc.
Since the fluorine-containing resin, however, has water- and oil-repelling property and small surface activating energy, the fluorine-containing resin has very poor adhesion, difficulty of production of a composite material and inferior printing properties.
Therefore various techniques for modifying a surface of a fluorine-containing resin molded article have been studied, and there have been proposed chemical etching treatment by means of a liquid ammonia/sodium solution or a sodium
aphthalene complex; corona discharge treatment; plasma discharge treatment; and the like.
Further, surface modification by pulse-irradiation of an excimer laser beam having a wavelength ranging from 95 to 200 nm was proposed (JP-B-57143/1991). However, that method is such that a fluorine-containing resin molded article is pulse-irradiated in the air with the excimer laser beam having a wavelength ranging from 95 to 200 nm, and thus, its adhesion to an adhesive, printing ink, paint or the like is improved, but is not sufficient. Also though it is known that nearly the similar improvement in adhesion is obtained by irradiating a laser beam in an atmosphere of inorganic compound such as hydrazine gas (Niino, Yabe et al., "Contributions II to The 65th Spring Meeting of Japan Chemical Society" (1993), p252), when such a gas is used, a vacuum vessel is required, which makes a cost of an equipment high. In addition, hydrazine has toxicity and explosiveness and there is a problem with its handling.
In addition to the above-mentioned methods, there is known a method for surface-modifying an acrylic resin by irradiating a laser beam in an atmosphere of gaseous or liquid nitrogen-containing compound (JP-A-222223/1993). However, that patent publication does not indicate any concept of making the atmosphere basic in the surface modification of a fluorine-containing resin molded article, and says that the atmosphere used is preferably in gaseous form rather than in liquid form.
It is an object of the present invention to solve the above-mentioned problems of conventional methods and to provide a surface-modified fluorine-containing resin molded article which has enhanced adhesion not only to organic materials such as an adhesive, printing ink and paint but also to metals.
DISCLOSURE OF THE INVENTION
The present invention relates to a surface-modified fluorine-containing resin molded article obtained by irradiating its surface with a laser beam having a wavelength of 150 to 370 nm through a basic solution.
It is preferable that the above-mentioned basic solution is an aqueous basic solution.
It is preferable that a pKb of the above-mentioned aqueous basic solution is not more than 5.
It is preferable that the pKb of the above-mentioned aqueous basic solution is from 4 to 0.1.
It is preferable that the above-mentioned aqueous basic solution is an aqueous solution of a quaternary phosphonium compound or quaternary ammonium compound represented by the formula: an alkyl group having 1 to 20 carbon atoms or an aralkyl group having 7 to 20 carbon atoms, X is an anion such as halide, hydroxylate, alkoxylate, carboxylate, phenoxide, sulfonate, sulfate, sulfite or carbonate, Y is nitrogen atom or phosphorus atom; a quaternary ammonium compound represented by the formula: .multidot.2X.sup..crclbar. having 1 to 21 carbon atoms or a phenylenedialkylene group having 8 to 12 carbon atoms; or a quaternary ammonium compound represented by the formula: ##STR1## wherein X is the same as above, R.sup.11 is an alkyl group having 1 to 24 carbon atoms or an aralkyl group having 7 to 20 car
REFERENCES:
patent: 4052278 (1977-10-01), Brown et al.
patent: 5240973 (1993-08-01), Katoh et al.
patent: 5500459 (1996-03-01), Hagemeyer et al.
Niino, Yabe et al., "Contributions II to the 65th Spring Meeting of Japan Chemical Society," (1993), p. 252.
Hiraoka Hiroyuki
Tamaru Shinji
Tanaka Osamu
Cain Edward J.
Daikin Industries Ltd.
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