Stain-proofing spectacle lens and manufacturing method thereof
A spectacle lens that can lower the slipperiness of a lens surface to an extent that allows an edging process by making without deteriorating the stain-proofing performance of the stain-proofing layer, when a stain-proofing layer is formed of two or more kinds of silane compounds including at least one or more kinds of fluorine-containing silane compounds, and as for the dynamic friction coefficient of lens surfaces defined by each of the two or more kinds of silane compounds as a single component, the highest value of the dynamic friction coefficients 1.4 times or more of the lowest value of the dynamic friction coefficients; and a manufacturing method thereof are provided.
1. A stain-proofing spectacle lens, comprising:
a stain-proofing layer formed on a surface of the spectacle lens with two or more kinds of silane compounds including at least one or more kinds of fluorine-containing silane compounds;
wherein dynamic friction coefficients of lens surfaces, defined by each of the two or more kinds of silane compounds as a single component, a highest dynamic friction coefficient value is 1.4 times or more of a lowest dynamic friction coefficient value.
2. The stain-proofing spectacle lens according to claim 1 :
wherein, among two or more kinds of the silane compounds, a content of a silane compound that gives a surface lowest in the dynamic friction coefficient is in the range of 30 to 99% by weight relative to a total amount of silane compounds.
3. The stain-proofing spectacle lens according to claim 1 :
wherein the dynamic friction coefficient of a lens surface that is formed with a silane compound that gives the lowest dynamic friction coefficient among two or more kinds of silane compounds as a single component is 0.2 or less.
4. The stain-proofing spectacle lens according to claim 1 :
wherein, among two or more kinds of the silane compounds, at least one kind is expressed with a general formula (1) below
(In the formula, R f expresses a straight chain or a branched chain perfluoroalkyl group having 1 to 16 carbon atoms; X, an iodine atom or a hydrogen atom; Y, a hydrogen atom or a lower alkyl group; Z, a fluorine atom or a trifluoromethyl group; R 1 , a hydrolizable group; R 2 , a hydrogen atom or an inactive monovalent organic group; a, b, c and d, an integer of 0 to 200; e, 0 or 1; m and n each, an integer of 0 to 2; and p, an integer of 1 to 10).
5. The stain-proofing spectacle lens according to any one of claims 1 through 4 :
wherein an anti-reflection coating is formed as for a lower layer of the stain-proofing layer of the stain-proofing spectacle lens.
6. A method of manufacturing a stain-proofing spectacle lens, comprising:
a step of forming an antireflection coating on a surface of a lens base material on which a hard coat film may be formed; and
a step of forming a stain-proofing layer, from two or more kinds of silane compounds including at least one kind or more of fluorine-containing silane compounds, on the antireflection coating;
wherein dynamic friction coefficients of lens surfaces, defined by each of the two or more kinds of silane compounds as a single component, a highest dynamic friction coefficient value is 1.4 times or more a lowest dynamic friction coefficient value.
7. The method of manufacturing a stain-proofing spectacle lens according to claim 6 ,
wherein a treatment agent containing the two or more kinds of the silane compounds is coated on a lens surface in the step of forming a stain-proofing layer from two or more kinds of silane compounds including at least one or more kinds of fluorine-containing silane compounds on the antireflection coating.
8. The method of manufacturing a stain-proofing spectacle lens according to claim 6 :
wherein two or more kinds of the silane compounds are evaporated in a vacuum chamber and stuck on a lens surface in the step of forming a stain-proofing layer from two or more kinds of silane compounds including at least one or more kinds of fluorine-containing silane compounds on the antireflection coating.