Adhesive tape and edging method using same
An adhesive tape which is to be arranged between a lens and at least one of a plurality of chucks in an edge-machining apparatus comprises an adhesive face for being in contact with the lens. A measurement 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°-peeling method as defined in JIS Z 0237 “adhesive tape/adhesive sheet test method”. A technique which can be used to edge the lens in which an antifouling layer is formed by using a fluorine-containing silane compound having an excellent antifouling effect is also provided.
1. An edging method, comprising the steps of:
attaching an adhesive tape on an antifouling layer of a lens on which the antifouling layer is provided, wherein the antifouling layer is formed by using, as a main component, a fluorine-containing silane compound; and
edging the lens by an edge-machining apparatus while 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 the edge-machining apparatus,
wherein the lens is maintained by the adhesive tape which comprises an adhesive face for being in contact with the lens and having a measurement value of an adhesive strength of the adhesive face being 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°-peeling method as defined in JIS Z 0237 “adhesive tape/adhesive sheet test method”, and
the elastic modulus of traction (Em) of the adhesive tape is in the range of from 1 kgf/mm 2 to 450 kgf/mm 2 .
2. The edging method as set forth in claim 1 , wherein the antifouling layer is formed by using as a main component a fluorine-containing silane compound as represented by the following general formula (1):
wherein R f represents a straight or branched perfluoroalkyl group having from 1 to 16 carbon atoms;
X represents iodine or hydrogen;
Y represents hydrogen or a lower alkyl group;
Z represents fluorine or a trifluoromethyl group;
R 1 represents a hydrolysable group;
R 2 represents hydrogen or an inactive monovalent organic group;
a, b, c, and d each individually represents an integer of from 0 to 200;
e represents 0 or 1;
m and n each individually represents an integer of from 0 to 2; and
p represents an integer of from 1 to 10.
3. The edging method as claim 1 , wherein the adhesive tape is attached to the concave face of the lens.
4. The edging method as claim 1 , wherein the adhesive tape is attached to the concave face of the lens.
5. The edging method as claim 2 , wherein the adhesive tape is attached to the concave face of the lens.
6. The edging method as claim 1 , wherein the plurality of chucks is a pair.