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  Adhesive tape and edging method using sameRelated Patent Categories: Stock Material Or Miscellaneous Articles, Web Or Sheet Containing Structurally Defined Element Or Component, Adhesive Outermost Layer, Three Or More LayersThe Patent Description & Claims data below is from USPTO Patent Application 20080026216. Brief Patent Description - Full Patent Description - Patent Application Claims
CROSS-REFERENCE TO RELATED APPLICATIONS [0001] This is a divisional of application Ser. No. 10/899,047 filed Jul. 27, 2004. Priority is claimed from JP 2003-017552 filed Jan. 27, 1993, and also from JP 2003-390682 filed Nov. 20, 2003. The entire disclosures of the prior application, application Ser. No. 10/899,047, and the above-identified priority documents, are hereby incorporated by reference. TECHNICAL FIELD [0002] Present invention relates to an adhesive tape for use in edging and an edging method and, particularly, to an adhesive tape favorable for edging of a lens provided with an antifouling layer and an edging method. BACKGROUND OF THE INVENTION [0003] In order to suppress reflection of light or increase transmittance of the light, a reflection reducing coating is ordinarily formed on a surface of a lens, such as a spectacle lens. There is a problem in that, at the time of use, a stain derived from adherence of, for example, dirt from a hand, a fingerprint, perspiration, or cosmetic is conspicuous and it is hard to remove the stain. In coping with this problem, in order to prevent the stain from adhering or to facilitate removal of the stain whenever adhered, an antifouling layer has further been provided on a surface of the reflection reducing coating. [0004] With regard to a surface treating agent for providing the antifouling layer on the spectacle lens, a fluorine-containing silane compound which is described in JP-A No. 9-258003 to form the antifouling layer is favorable in terms of the antifouling property. Further, the effect thereof lasts long. [0005] However, the lens which has been subjected to the surface treatment with the fluorine-containing silane compound as described in the above publication has an extremely small friction coefficient compared to that obtained by using a conventional surface treating agent. Therefore, the surface of the lens has such a characteristic as being too slippery. Due to this characteristic, a problem as described below occurs when the lens is subjected to edging. At a retail shop of spectacles, grinding a round spectacle lens to be in a shape in which the lens can be inserted in a spectacle frame, namely, so-called edging has been performed. [0006] In the edging, first, a machining center of the spectacle lens is sucked and held by chucks of an edge-machining apparatus. In another case, the machining center of the spectacle lens is clamped while being applied with pressure from both sides of the lens. In a manner as described above, an edge of the spectacle lens is ground by a grinding stone while the spectacle lens is held by a frictional force. Since the surface of the lens held by the chucks has good slipperiness, when the lens is ground by a grinding stone, the lens slips out of position, due to a grinding pressure of the grinding stone against the chucks, namely, a so-called axial misalignment occurs. This causes a problem in that precise edging can not be performed. [0007] Under these circumstances, the present invention has been achieved and has an object to provide a technique capable of allowing edging a lens on which an antifouling layer has been formed by using a fluorine-containing silane compound excellent in an antifouling effect. SUMMARY OF THE INVENTION [0008] In order to attain the aforementioned object, the present inventors have exerted an intensive study and, as a result, have found an adhesive tape having an excellent adhesive strength against an antifouling layer on a surface of a lens with which chucks of an edge-machining apparatus are allowed to be in contact. [0009] The present inventors have conducted a test by using a stainless steel plate as a test plate as described in an adhesive strength test of an adhesive tape in JIS Z 0237 "adhesive tape/adhesive sheet test method". However, as a result, it has been found that there is no difference at all between a measurement value of the adhesive strength of the adhesive tape having an excellent adhesive strength and a measurement value of the adhesive strength of the adhesive tape having an inferior adhesive strength against the lens on which the antifouling layer has been provided. [0010] Therefore, the present inventors have studied a method for distinguishing from others, the adhesive tape having the excellent adhesive strength against the lens on which the antifouling layer is formed by using the fluorine-containing silane compound. Specifically, the present inventors have conducted a test of the adhesive strength of an adhesive tape by using a polyethylene terephthalate plate which has been subjected to a surface treatment by using a fluorine-modified silicone parting agent as a test plate. [0011] As a result, it has been found that, by using the latter plate rather than the stainless steel plate as a test plate, a difference appears between measurement values of an adhesive tape having an excellent adhesive strength and that having an inferior adhesive strength against the spectacle lens on which the antifouling layer has been provided. [0012] Further, when the adhesive tape has an adhesive strength of 4 gf or more in the adhesive strength test using this test plate, it has been found that the adhesive tape is favorably attached to the spectacle lens on which the antifouling layer is formed by using the fluorine-containing silane compound. Still further, when the adhesive tape having an adhesive strength of 4 gf or more is interposed between the chuck of the edge-machining apparatus and the lens, it has been found that edging can be performed without generating an axial misalignment. [0013] At the time of edging, a method of holding the lens by applying pressure by the chuck of the edge-machining apparatus from both sides of the lens is adopted. In such case, in a progressive multifocal lens, by attaching the adhesive tape to the concave face of the lens, it is not necessary to attach the adhesive tape on the convex face of the lens on which various types of layout marks have been applied. Accordingly, the edging can be performed without the need of removing the layout marks. [0014] Further, when the adhesive tape is attached to the convex face of a progressing multifocal spectacle lens, in order to avoid a mark of a fitting point which has been applied, it is preferable to provide a bored-through hole in a center portion of the adhesive tape. [0015] The adhesive tape according to the present invention is an adhesive tape which is provided between a lens and at least one of a plurality of chucks in an edge-machining apparatus and comprises an adhesive face for being in contact with the lens. Generally, the plurality of chucks represents a pair. Further, a measurement value of the adhesive strength of the adhesive face is 4 gf (0.0392 N) or more when a polyethylene terephthalate plate which has been subjected to a surface treatment with a fluorine-modified silicone parting agent is used as a test plate in an adhesive strength test method based on a 180.degree.-peeling method as defined in JIS Z 0237 "adhesive tape/adhesive sheet test method". [0016] In one embodiment, a bored-through hole is provided in the central portion of the adhesive tape according to the present invention. An edging method according to the present invention attaches an adhesive tape on an antifouling layer of a lens in which the antifouling layer is provided. Then, the lens is held by a plurality of chucks such that the adhesive tape is interposed between the lens and at least one of the plurality of chucks in an edge-machining apparatus. Thereafter, edging of the lens is performed by the edge-machining apparatus. [0017] Preferably, the adhesive tape comprises an adhesive face for being contact with the lens. And, a measurement value of an adhesive strength of the adhesive face is 4 gf (0.0392 N) or more when a polyethylene terephthalate plate which has been subjected to a surface treatment with a fluorine-modified silicone parting agent is used as a test plate in an adhesive strength test method based on a 180.degree.-peeling method as defined in JIS Z 0237 "adhesive tape/adhesive sheet test method". [0018] More preferably, the antifouling layer is formed by using as a main component a fluorine-containing silane compound as represented by the following general formula (1): [0019] wherein R.sub.f represents a straight or branched perfluoroalkyl group having from 1 to 16 carbon atoms; [0020] X represents iodine or hydrogen; Continue reading... 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