WO2006117986A1

WO2006117986A1 - Method of cutting spectacle lens and spectacle lens

Info

Publication number: WO2006117986A1
Application number: PCT/JP2006/307747
Authority: WO
Inventors: Takamitsu Hirose; Hitoshi Kamura
Original assignee: Hoya Corporation
Priority date: 2005-04-27
Filing date: 2006-04-12
Publication date: 2006-11-09
Also published as: JP4755909B2; JP2006330677A

Abstract

A method of cutting a spectacle lens which comprises: a step in which a resinous coating film made of chlorinated polypropylene or chlorinated polyethylene is formed on a lens surface coated with a water-repellent thin film; a step in which a double-faced pressure-sensitive adhesive tape for lens processing is applied to the resinous film; and a step in which this lens is cut. Also provided is a spectacle lens which comprises a lens coated with a water-repellent thin film and, formed on the surface thereof, a resinous coating film made of chlorinated polypropylene or chlorinated polyethylene. In the method of spectacle lens cutting, the lens having water repellency does not suffer axial shifting during cutting, e.g., cutting into a shape suitable for fitting into a spectacle frame.

Description

Specification

Eyeglass lens cutting method and eyeglass lens

Technical field

TECHNICAL FIELD [0001] The present invention relates to an eyelid lens cutting method and a spectacle lens, and more particularly to a spectacle lens cutting method and a spectacle lens.

A spectacle lens is used by cutting a circular slab lens into a target lens shape so as to match the shape of a spectacle frame. On the other hand, the surface of the spectacle lens is provided with a water-repellent film for preventing splashes on the outermost layer in addition to a hard coat film and an anti-reflection film for preventing scratches. In recent years, a water-repellent and anti-slip film having good slipperiness has been increasingly used. When processing a lens into a lens shape, if the lens surface with good water repellency as described above is processed using a double-sided tape for lens processing made of ethylene-butyl acetate copolymer or the like by the conventional method, the lens surface Because of good sliding, slippage occurs between the lens surface and the suction cup or the double-sided tape for lens processing, and axis misalignment tends to occur. For this reason, for lenses with a surface with good slipperiness, an adhesive tape made of a film of polyester or the like is generally applied to one or both sides of the lens, and then a suction cup or a double-sided tape for lens processing is used. Axial misalignment is prevented by sticking (see Patent Document 1).

[0003] However, in the method described in Patent Document 1, when the adhesive tape is applied to the surface of the lens having a small radius of curvature, the adhesive tape is wrinkled, or between the lens surface and the adhesive tape. If air enters the surface, it may cause a decrease in the adhesive strength of the adhesive tape during the ball-shaped caulking, which may cause a misalignment of the machining axis. Also, if the size of the adhesive tape is larger than the processing target, the tape will be caught in the gap between the lens and the grinding tool during processing, reducing the processing accuracy and clogging the tape force piece at the cooling water drain of the processing machine. In general, the size of the adhesive tape is smaller than the cut lens shape. For this reason, the contact area between the lens surface and the adhesive tape is reduced, such as a lens with a high lens power. In addition, when the load resistance during machining is large, the axis may be displaced.

In addition, the method using the adhesive tape disclosed in Patent Document 1 is a process in which the lens power is measured in advance, the optical center and the astigmatic axis are marked, and then the adhesive tape is applied. Occasionally there are more opportunities for scratches.

In addition, the lens surface with good water repellency has a problem that it is difficult to apply a uniform transparent film because the coating solution is repelled on the lens surface where the wettability of water-based or alcohol-based liquid is poor.

Further, Patent Document 2 discloses a film-forming agent for forming a film that is tightly fixed to the lens surface by being applied to the lens surface as a means for preventing axial deviation, a support having a predetermined strength, It is disclosed to use a kit comprising an adhesive tape force having at least an adhesive that can be attached onto a film, wherein the film-forming agent contains a synthetic resin and a solvent, and methanol is preferred as the vinyl acetate solvent as the synthetic resin. It is disclosed. However, as described in Patent Document 2, when a film is formed using butyl acetate as a synthetic resin and methanol as a solvent, the film is uneven and a uniform film cannot be formed. There was a problem that it was difficult to measure the frequency with a lens meter.

Under such circumstances, there has been a demand for a cutting method with high work efficiency that suppresses axial misalignment when processing a lens having water repellency and high slipperiness.

Patent Document 1: Japanese Patent Application Laid-Open No. 2004-122302

Patent Document 2: JP 2004-122238 A

Disclosure of the invention

Problems to be solved by the invention

[0004] The present invention has been made to solve the above-described problems, and causes an axis misalignment when performing a cutting process such as a lens shape process for placing a water-repellent lens in an ophthalmic frame. An object of the present invention is to provide a spectacle lens cutting method and a spectacle lens with good working efficiency.

Means for solving the problem

[0005] As a result of intensive studies to achieve the above object, the present inventors have made a resin comprising a chlorinated polypropylene or a chlorinated polyethylene on the lens surface to which the water-repellent thin film has been applied. By forming the coating film, the spectacle lens can be cut without causing an axis deviation. Since the resin coating film has transparency, the coating film is formed when performing cutting processing such as target lens processing. Since the frequency measurement and the marking can be performed in a state of being damaged, it has been found that damage is prevented, and the present invention has been completed.

[0006] That is, the present invention relates to a step of forming a resin film having a chlorinated polypropylene or chlorinated polyethylene strength on the surface of a lens to which a water-repellent thin film has been applied, and a double-sided tape for lens processing on the resin film. A method of cutting a spectacle lens having a step of adhering and a step of cutting the lens, and a resin coating made of chlorinated polypropylene or chlorinated polyethylene on the surface of the lens having a water-repellent thin film It provides spectacle lenses that are formed.

The invention's effect

[0007] According to the method for cutting spectacle lenses of the present invention, when cutting spectacle lenses having water repellency, accurate processing can be performed without causing an axis deviation.

Brief Description of Drawings

FIG. 1 is a diagram for explaining a center deviation distance and an axis deviation angle, which serve as a reference for evaluating a lens axis deviation.

BEST MODE FOR CARRYING OUT THE INVENTION

[0009] The method for cutting a spectacle lens of the present invention includes a step of forming a resin film made of chlorinated polypropylene or chlorinated polyethylene on a lens surface provided with a water-repellent thin film, and a lens on the resin film. A process of attaching a processing double-sided tape, and a process of cutting the lens.

In addition, the spectacle lens of the present invention is formed by forming a resin film made of chlorinated polypropylene or chlorinated polyethylene on the surface of a lens to which a water-repellent thin film has been applied. The lens used in the present invention is not particularly limited, and can be applied to either a glass lens or a plastic lens, and may be provided with a cured film, an antireflection film, or the like. The material for the cured film is not particularly limited, and a coating composition comprising a known organic silicon compound and metal oxide colloid particles can be used. The material and the formation method of the antireflection film are not particularly limited, and are simply made of a conventionally known inorganic oxide. Layers and multilayers can be used.

In addition, the type and forming method of the water-repellent thin film applied to the lens surface are not particularly limited.

For example, it may be formed by a known method such as vacuum deposition using a water repellent agent such as a fluorine-containing silane compound as described in JP-A-2005-3817. In order to make the resin coating more easily peeled off from the water-repellent thin film, it is preferable that the water-repellent thin film has a material strength that has good oil repellency in addition to water repellency.

[0010] The resin film having the chlorinated polypropylene strength is preferably formed by using a film forming agent made of a chlorinated polypropylene solution containing the chlorinated polypropylene and the solvent. The film is preferably formed using a film forming agent comprising a chlorinated polyethylene solution containing chlorinated polyethylene and a solvent. Hereinafter, the chlorinated polypropylene solution and the chlorinated polyethylene solution may be collectively referred to as a film forming agent.

[0011] The film-forming agent used in the present invention is a solution for forming a resin film on the lens surface, and the concentrations of chlorinated polypropylene and chlorinated polyethylene (solute) in the film-forming agent are film formation for each. Based on the total amount of the agent, it is usually 5 to 40% by mass, preferably 15 to 25% by mass. The weight average molecular weight of chlorinated polypropylene and chlorinated polyethylene is usually 4 to 100,000, preferably 60 to 80,000. The solid concentration of the film forming agent is usually 5 to 40% by mass, preferably 15 to 25% by mass.

The chlorinated polyethylene is obtained by adding chlorine to polyethylene, and the chlorinated polypropylene is obtained by adding chlorine to polypropylene.

Solvents for the chlorinated polypropylene and chlorinated polyethylene are not particularly limited. For example, aliphatic hydrocarbon compounds having aromatic hydrocarbons, chlorinated hydrocarbons, esters, ketones, and alicyclic hydrocarbons. It is preferable to use one or more selected from

Examples of the aromatic hydrocarbon include toluene, xylene and the like, and examples of the chlorinated hydrocarbon include methyl chloride, methylene chloride, chlorophenol, trichloroethylene, tetrachloroethylene and the like, and examples of the esters Examples include acetic acid esters and propionic acid esters. Examples of the ketones include methyl ethyl keto , Methyl isobutyl ketone, diisobutyl ketone, acetone and the like, and examples of the aliphatic hydrocarbon containing the alicyclic hydrocarbon include cyclohexane, methinorecyclohexane, ethylcyclohexane and the like. It is done.

[0012] In addition, as the film forming agent used in the present invention, a surfactant may be added if necessary. Silicone surfactants and Z or fluorine surfactants are preferred. By adding a surfactant, the formed film becomes more uniform without unevenness, and the frequency measurement becomes easier.

The addition amount of the surfactant is usually 0.01 to 5% by mass, preferably 0.1 to:% by mass, based on the total amount of the film forming agent.

Examples of the silicone-based surfactant include the following general formulas (1) to (4). By changing the degree of polymerization and the modification rate, the low-viscosity liquid to the high-viscosity paste or solid Silicone can be used, and any hydrophilicity can be imparted by the organic group X.

[0013] [Chemical 1]

(Side-chain modified type)

CH ₃ X

(CH ₃ ) ₃ SiO (SiO) _m (SiO) _n Si (CH ₃ ) ₃

CH3 CH3

(Both ends modified type)

CH3 CH3 CH ₃

X_ SiO (SiO) _m Si— X

H3 0Η3 Η3

(One end modified type)

(Both side chain modified type)

H3 then X CH3

X- SiO (SiO) _m (SiO) _n Si-X

GH3 H3 0H3 CH3 In each of the general formulas (1) to (4), m is an integer of 1 or more, and n is an integer of 1 or more. Examples of the organic group X include the following polyethers, polyglycerols, pyrrolidones, betaines, sulfates, phosphates, and quaternary amine salts.

Polyether type: — C H0 (C H O) (C H 0) R [a is an integer of 1 or more, b is an integer of 1 or more

3 6 2 4 a 3 6 b

, R is an organic group. ]

Polyglycerin type: — C H 0 (CH CH (OH) CH 0) H [c is an integer of 1 or more. ]

3 6 2 2 c

Pyrrolidone series:

[Chemical 2]

Betaine: One C H N + (CH) CH COO "

Sulfate: C H 0 (C H 0) SO Na [a is an integer of 1 or more. ]

Phosphate: C H 0 (C H O) PO Na [a is an integer of 1 or more. ]

[Chemical 3] o

II

C ₃ H ₆ 0 (C ₂ H ₄ 0) _a — P— ONa

OH

[a is an integer greater than or equal to 1. ]

4th grade amin salt: -CHN ⁺ (CH) -Of

[0015] Further, examples of the fluorine-based surfactant include anionic, nonionic, cationic and zwitterionic types.

[0016] A resin film is formed on the surface of the lens on which the water-repellent thin film has been formed using the film forming agent as described above. Examples of the resin film forming method include spin coating and dip coating. A method can be used, and it is preferably formed by a dip coating method. Specifically, by a dip coating method, the lens is usually fixed at a rising speed of 50 mm / min to 1000 mm / min, preferably 150 mm / min to 600 mm Zmin, by a shaft member used for lens cutting or lens processing. It is preferably applied to the entire lens surface from the viewpoint of reducing handling scratches. After application, when the solvent volatilizes, a resin film is formed that is tightly fixed to the lens surface.

Conventionally, in order to obtain a transparent coating, it has been necessary to eliminate film thickness unevenness and eliminate bubbles in the coating. In the present invention, chlorinated polypropylene or chlorinated polyethylene is used as described above. By using a solution dissolved in a highly volatile solvent For example, since the solvent of the coating force formed on the lens surface is quickly volatilized when the lens is pulled up after immersion, the viscosity of the coating solution increases, and repelling by the water repellent film is suppressed. For this reason, it becomes possible to obtain a uniform and transparent film without requiring the viscosity of the solution to be higher than necessary.

[0017] In the present invention, after the resin coating is formed, a double-sided tape for lens application is stuck on the resin coating, and the lens is cut.

The double-sided tape for lens processing is not particularly limited. For example, a trade name: leave tape (manufactured by Sumitomo 3M Co., Ltd.), trade name: blocking pad (manufactured by Simon Co., Ltd.), etc. It ’s known.

In addition, the processing machine for cutting the lens is not particularly limited, and it is possible to use a machine that is used in a spectacle retailer or the like that is used by a publicly known machine or a machine that is used by a processor. it can.

In the case of a spectacle lens after cutting, if the resin coating is unnecessary, it can be easily removed by pinching the end of the resin coating with a finger.

Example

Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.

Example 1

(1) Fabrication of plastic lens with antireflection film

As the plastic lens, diethylene glycol bisvalyl carbonate polymer lens (Hi-Lux (trade name) manufactured by HOYA Co., Ltd., refractive index 1.499, power 0.00) is used. The cured film disclosed in Kaisho 63-10640 was applied. Specifically, colloidal silica with 40% SiO concentration (Snowtex-40, moisture

2

Y-Glycidoxypropyl while stirring a solution of 240 parts by weight of 0.5N hydrochloric acid (2.0 parts by weight) and acetic acid (20 parts by weight) at 35 ° C. 95 parts by mass of trimethoxysilane (trifunctional organosilicon compound) was added dropwise, stirred at room temperature for 8 hours, and allowed to stand at room temperature for 16 hours. To this hydrolyzed solution, 80 parts by mass of methylceguchi sorb, 120 parts by mass of isopropyl alcohol, 40 parts by mass of butyl alcohol, 16 parts by mass of aluminum acetylethylacetone, silicone surfactant (NUC Silwet Y—7006 (trade name) , Japan Uni 0.2 parts by weight, UV absorber (Tinubin P (trade name), Ciba Geigy) 0.1 parts by weight, stirred for 8 hours, and then aged at room temperature for 24 hours Got. The composition was applied by a dipping method at a lifting speed of 15 cm / min, allowed to stand at room temperature for 15 minutes, and then heat-cured at 120 ° C. for 2 hours to give a cured film.

Next, an underlying layer (refractive index 1.46, film thickness) made of silicon dioxide is formed on the cured film by a vacuum deposition method (vacuum degree 2.67 X 10 " ³ Pa (2 X 10" ⁵ Torr)). 0.5 λ (where λ is 550 nm)), and a layer made of titanium dioxide (obtained with a thickness of 0.06 nm) obtained by an ion beam assisted method in which a plastic lens is irradiated with an oxygen ion beam. ), A layer composed of silicon dioxide (film thickness 0.12 mm) obtained by vacuum deposition, and a layer equivalent to titanium dioxide (film thickness 0.06 mm) obtained by ion beam assist method The first layer (refractive index 1.70, film thickness 0.24 λ) was formed. On this first layer, a second layer (refractive index 2.40, film thickness 0.5 λ) having a titanium dioxide force is formed by ion beam assist, and a vacuum is formed on the second layer. deposition third layer of silicon dioxide by (vacuum degree ^{2. 67 X 10- 3 Pa (2} X 10- 5 Torr)) ( refractive index 1.46, film thickness 0.25 e) forming a reflective A plastic lens with a protective film was obtained. This lens was circular with a diameter of 75 mm, and its luminous reflectance was 0.4%.

(2) Formation of water-repellent thin film

Using the following compound (A) as a water repellent treatment agent and metaxylene hexafluoride (C H (CF)) as a solvent on both sides of the plastic lens obtained in (1) above,

6 4 3 2

Thus, a lens having a fluorine antifouling coating was produced.

(CH O) SiCH CH CH OCH CF (OC F) (OCF) OCF CH OCH CH CH

3 3 2 2 2 2 2 2 4 p 2 q 2 2 2 2 2

Si (OCH) (A)

3 3

(In the formula, p = 22, q = 22, the arrangement of repeating units (〇CF) and (〇CF) is random.

2 4 2

Compound (A) is a cured product having a three-dimensional structure. )

A stainless steel sintered filter (Ita pore diameter 80-100 am, diameter 18 mm φ, thickness 3 mm) impregnated with 0.3 ml of compound (A) was set in the vacuum evaporation system, and the following (I), (II) The entire sintered filter was heated using an electron gun under conditions to form a water-repellent thin film on the plastic lens with the antireflection film. The power of this lens was _7.00D, and the luminous reflectance was 0.4%. (I) Degree of vacuum: 3.1 X 10 to 8.0 X 10 Pa (2.3 X 10 to 6.0 X 10 Torr)

(II) Electron gun conditions

Accelerating voltage: 6kV, applied current: 15mA, irradiation area: 3.5 X 3.

Deposition time: 30 seconds

[0020] (3) Formation of resin coating

As a film-forming agent, a film-forming agent (trade name: Super Clone Japan) containing chlorinated polypropylene having a weight average molecular weight of 60,000 to 80,000 as a solute and toluene and cyclohexane as a solvent so that the solid content concentration is 20% by mass. Applying the film-forming agent to the entire surface of the plastic lens obtained in (2) using a paper-making chemical, with a dipping speed of 300 mm / min and a rising speed of 300 mm / min. Then, it was dried at room temperature for 15 minutes to form a resin film on the plastic lens.

(4) Evaluation of plastic lenses

The above operations (1) to (3) were repeated to produce 10 plastic lens samplings, and the following evaluations (i) and (ii) were performed.

(i) Measurement of frequency change

Table 1 shows the results of measuring the power with a lens meter for the plastic lens sample before and after the resin coating.

(ii) Measurement of axis deviation

Two lines should be perpendicular to the horizontal direction (X axis) and the vertical direction (Y axis) so as to pass through the optical center of the lens. Attach the tape so that the reference point of the lens processing double-sided tape (Product name: Leave Tape (Sumitomo 3M Co., Ltd.)) will come to the optical center of the lens.After that, HOYA Co., Ltd. (Product name: AE_3000) is used for lens lens processing, and the distance and angle between the reference points of the double-sided tape for lens force measurement before and after lens processing are measured. The center deviation distance (A (mm)) and the axis deviation angle (Θ (°)) were used, respectively (see Fig. 1.) In Fig. 1, the dotted line shows the orthogonal coordinates before machining, and the solid line shows the orthogonal coordinates after machining. Table 2 shows the results obtained.

In Table 2, the center deviation distance A is 0.5 mm or more as X, and less than 0.5 mm as ◯.

[0021] Comparative Example 1 In Example 1, a polyester film (trade name: AT-22 Big Technos Co., Ltd.) was pasted on both sides of a spectacle lens instead of a resin coating, and a double-sided adhesive tape ( Ten plastic lens samples were prepared in the same manner except that the leave tape (Sumitomo 3M Co., Ltd.) was attached, and (i) and (ii) of (4) were evaluated. The results are shown in Tables 1 and 2.

However, in Comparative Example 1, the measurement of (4) (i) was performed on samples before and after application of polyester film, instead of plastic lens samples before and after resin film formation. The frequency was measured with a lens meter.

[0022] Comparative Example 2

In the same manner as in Example 1, except that the resin coating was not formed and only the double-sided processing tape (leave tape (manufactured by Sumitomo 3M)) was attached to the convex surface of the spectacle lens, a plastic lens was formed. Table 2 shows the results of the evaluation of (ii) in (4) by preparing 10 samples.

[0023] [Table 1] Table 1

* S represents frequency and the unit is D.

[0024] From the results in Table 1, for the plastic lens of Example 1, the frequency before and after the resin coating was formed There was no significant difference in display. On the other hand, the plastic lens of Comparative Example 1 has a frequency difference that is large before and after the polyester film is pasted. I can't do that. Normally, since a lens meter is used to determine the position where the film or tape is applied, it is impossible to apply the film or tape at an accurate position without any mark.

From the above results, it was confirmed that accurate frequency measurement can be performed by forming a resin film as in Example 1.

[Table 2] Table 2

From the results in Table 2, in the plastic lens of Example 1, all the 10 lenses were strong without causing center misalignment and axial misalignment. On the other hand, in Comparative Example 1, there was no center misalignment, but there was an axis misalignment. In Comparative Example 2, the center deviation and the axis deviation occurred in all the lenses. In addition, the plastic lens of Example 1 was maintained without deterioration of water repellency after processing the target lens shape. In addition, when the lens processing is completed, if the end of the resin coating of the plastic lens of Example 1 is pinched with a finger and removed, the processed lens will be clean with no dirt on the lens surface. Since it is not necessary, handling scratches can be reduced.

[0027] Example 2

In Example 1, a plastic surfactant is made of resin in the same manner except that 0.1% by mass of a silicone surfactant (Y_7006 (trade name), (manufactured by Dow Co., Ltd.)) is added to the film forming agent. When a film was formed and the plastic lens was evaluated in the same manner as in Example 1 (4), the same result as in Example 1 was obtained.

Comparative Example 3

In Example 1, instead of the film forming agent used in Example 1, 25-35% by mass of modified vinyl acetate resin as a synthetic resin and 65-75% by mass of methanol as a solvent (Three Bond 1401 (Product name), manufactured by Three Bond Co., Ltd.) When a resin film was formed on a plastic lens in the same manner, irregularities were formed on the lens surface, and (1) of Example 4 (4) As a result of measuring the power of the plastic lens in the same manner as above, the power display value on the lens meter was an incorrect value.

Industrial applicability

[0028] According to the spectacle lens cutting method of the present invention, when cutting spectacle lenses having water repellency, such as a ball-shaped Kaloe, accurate processing can be performed without causing an axis deviation. Therefore, it is useful as a practical eyeglass lens cutting method.

Claims

The scope of the claims

[1] A step of forming a resin film having a chlorinated polypropylene or chlorinated polyethylene strength on a lens surface provided with a water-repellent thin film; a step of attaching a double-sided tape for lens processing on the resin film; A method for cutting spectacle lenses, comprising a step of cutting a lens.

2. The spectacle lens cutting method according to claim 1, wherein the resin film is formed by a dip coating method.

[3] The resin coating having the chlorinated polypropylene strength is selected from chlorinated polypropylene and an aliphatic hydrocarbon compound having an aromatic hydrocarbon, a chlorinated hydrocarbon, an ester, a ketone, and an alicyclic hydrocarbon. 2. The method for cutting an eyeglass lens according to claim 1, wherein the spectacle lens is formed using a film forming agent comprising a chlorinated polypropylene solution containing at least one solvent.

[4] The resin film having the chlorinated polyethylene strength is selected from chlorinated polyethylene and an aliphatic hydrocarbon compound having an aromatic hydrocarbon, a chlorinated hydrocarbon, an ester, a ketone, and an alicyclic hydrocarbon. 2. The method for cutting a spectacle lens according to claim 1, wherein the spectacle lens is formed using a film forming agent comprising a chlorinated polyethylene solution containing at least one solvent.

5. The method for cutting spectacle lenses according to claim 1, wherein the resin coating contains a surfactant.

6. The method for cutting a spectacle lens according to claim 1, wherein the water-repellent thin film also has oil repellency.

7. The spectacle lens cutting method according to claim 1, wherein the lens has an antireflection film.

[8] A spectacle lens in which a resin film having a chlorinated polypropylene or chlorinated polyethylene strength is formed on the surface of a lens having a water-repellent thin film.

9. The spectacle lens according to claim 8, wherein the resin coating contains a surfactant.

10. The spectacle lens according to claim 8, wherein the lens has an antireflection film.