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EP-4737952-A1 - METHOD FOR PRODUCING LENS

EP4737952A1EP 4737952 A1EP4737952 A1EP 4737952A1EP-4737952-A1

Abstract

The object of the present disclosure is to provide a method for producing a lens which includes a hard coat layer in which occurrence of outer peripheral unevenness is suppressed in a center portion and an outer peripheral portion of the lens. The method for producing a lens according to the present disclosure includes: a step 1 of performing a pre-wet treatment on a base including a plastic lens by using a pre-wet liquid containing a first solvent and a second solvent, and having a content of the second solvent based on a total amount of the first solvent and the second solvent of more than 20 mass%, the first solvent having a boiling point of 60 to 100°C, and the second solvent having a boiling point of 150 to 210°C; and a step 2 of forming a hard coat layer on the base by using a hard coat layer-forming composition containing the second solvent, the base having been subjected to the pre-wet treatment.

Inventors

  • SHIODA GORO

Assignees

  • Nikon-Essilor Co., Ltd.

Dates

Publication Date
20260506
Application Date
20240621

Claims (9)

  1. A method for producing a lens, the method comprising: a step 1 of performing a pre-wet treatment on a base including a plastic lens by using a pre-wet liquid containing a first solvent and a second solvent, and having a content of the second solvent based on a total amount of the first solvent and the second solvent of more than 20 mass%, the first solvent having a boiling point of 60 to 100°C, and the second solvent having a boiling point of 150 to 210°C; and a step 2 of forming a hard coat layer on the base by using a hard coat layer-forming composition containing the second solvent, the base having been subjected to the pre-wet treatment.
  2. The method for producing a lens according to claim 1, wherein the first solvent and the second solvent are alcohol solvents.
  3. The method for producing a lens according to claim 1 or 2, wherein the first solvent is a solvent selected from the group consisting of methanol, ethanol, 2-propanol, 2- methyl-2-propanol, and 2-butanol.
  4. The method for producing a lens according to any one of claims 1 to 3, wherein the second solvent is a solvent selected from the group consisting of 2-butoxyethanol, diethylene glycol monomethyl ether, and diethylene glycol monoethyl ether.
  5. The method for producing a lens according to any one of claims 1 to 4, wherein the hard coat layer-forming composition contains the first solvent.
  6. The method for producing a lens according to any one of claims 1 to 5, wherein the pre-wet treatment is treatment of spin-coating the pre-wet liquid.
  7. The method for producing a lens according to any one of claims 1 to 6, wherein in the pre-wet liquid, the content of the second solvent based on the total amount of the first solvent and the second solvent is more than 20 mass% and less than 30 mass%.
  8. The method for producing a lens according to any one of claims 1 to 7, the method further comprising a step of performing drying treatment on the base before the step 1.
  9. The method for producing a lens according to any one of claims 1 to 8, wherein the hard coat layer-forming composition includes a silsesquioxane compound.

Description

TECHNICAL FIELD The present disclosure relates to a method for producing a lens. BACKGROUND ART PATENT LITERATURE 1 discloses a method for applying a hard coat of a plastic lens, and discloses a method in which a surface of a plastic lens is activated when a hard coat liquid is spin-coated. CITATION LIST PATENT LITERATURE PATENT LITERATURE 1: JP H05-019103 A SUMMARY OF INVENTION The present disclosure related to a method for producing a lens, the method comprising: a step 1 of performing a pre-wet treatment on a base including a plastic lens by using a pre-wet liquid containing a first solvent and a second solvent, and having a content of the second solvent based on a total amount of the first solvent and the second solvent of more than 20 mass%, the first solvent having a boiling point of 60 to 100°C, and the second solvent having a boiling point of 150 to 210°C; and a step 2 of forming a hard coat layer on the base by using a hard coat layer-forming composition containing the second solvent, the base having been subjected to the pre-wet treatment. BRIEF DESCRIPTION OF DRAWINGS [FIG. 1] FIG. 1 is a cross-sectional view of an embodiment of a lens obtained by a method for producing a lens according to the present disclosure. DESCRIPTION OF EMBODOIMENT The method for producing a lens according to the present disclosure is described in detail below. A hard coat layer included in the lens is required to be uniformly formed at a center portion of the lens without unevenness. Further, in the lens having the hard coat layer formed thereon, unevenness in an outer peripheral portion of the lens is also required to be suppressed. The method for producing a lens according to the present disclosure makes it possible to produce a lens having the foregoing characteristics. Note that, in the description, numerical values given before and after "to" are included in the range as the lower and upper limits thereof. In the description, a refractive index means an e-line refractive index. <Method for producing lens> The method for producing a lens according to the present disclosure includes the above-mentioned step 1 and step 2. The procedures of the respective steps are described below. [Step 1] The method for producing a lens according to the present disclosure includes the step 1. The step 1 is a step of performing a pre-wet treatment on a base including a plastic lens by means of a pre-wet liquid. After the base and the pre-wet liquid are described, a method for performing the step 1 is described. (Base) The base used in the step 1 includes a plastic lens. The base is not particularly limited as long as it includes a plastic lens, and may include other layers. For example, the base used in the step 1 may be a base in which other layers are formed on a plastic lens. One example of other layers is a primer layer. A plastic lens and a primer layer, which primer layer may be included in a base, are described below. The plastic lens is not particularly limited, and a known plastic lens can be adopted. Examples of the plastic lens preferably include a spectacle plastic lens. The plastic lens is not particularly limited in type, and in the case where the plastic lens is for a spectacle, examples thereof include a finished lens that is obtained through optical finishing of both the convex and concave surfaces and shaping according to a desired power, a semi-finished lens whose convex surface is solely finished as an optical surface (e.g., a spherical surface, a rotationally symmetric aspheric surface, a progressive surface), and a lens obtained by processing and polishing the concave surface of a semi-finished lens according to the prescription of the wearer. A plastic (so-called resin) contained in the plastic lens is not particularly limited in type, and examples thereof include (meth)acrylic ester resin, thiourethane resin, allyl resin, episulfide resin, polycarbonate, urethane resin, polyester, polystyrene, polyethersulfone, poly-4-methylpentene-1, and diethylene glycol bis(allyl carbonate) resin (CR-39). Among those, thiourethane resin, episulfide resin, and diethylene glycol bis(allyl carbonate) resin is preferably used. Thiourethane resin is obtained from a polyisocyanate compound and a polythiol compound. As the polyisocyanate compound, at least one selected from m-xylylene diisocyanate, a mixture of 2,5-bis(isocyanatomethyl)-bicyclo[2,2,1]heptane and 2,6-bis(isocyanatomethyl)-bicyclo[2,2,1]-heptane, isophorone diisocyanate, hexamethylene diisocyanate, and tolylene diisocyanate is preferably used. As the polythiol compound, at least one selected from pentaerythritol tetrakis(3-mercaptopropionate), 1,2-bis[(2-mercaptoethyl)thio]-3-mercaptopropane, and a mixture of 5,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, 4,7-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane, and 4,8-dimercaptomethyl-1,11-dimercapto-3,6,9-trithiaundecane is preferably used. The episulfide resin is obtained by ring-opening polymerizat