KR20100024910A - Method for cleaning glass dies constituting plastic lens molding die - Google Patents

Abstract

PURPOSE: A method for cleaning glass dies constituting plastic lens molding die is provided to easily remove resin pollutants attached to plastic lens molding die using a cleaner composition including phenyl ether. CONSTITUTION: A method for cleaning glass dies constituting plastic lens molding die comprises a step for cleaning glass dies using a cleaner composition for a plastic lens molding die. The cleaner composition comprises at least one kind of phenyl ether selected from phenyl ether represented by chemical formula (1) and phenyl ether represented by chemical formula (2). The content of the phenyl ether is 2-20 weight%.

Description

METHOD FOR CLEANING GLASS DIES CONSTITUTING PLASTIC LENS MOLDING DIE}

This invention relates to the cleaning method of the glass die which comprises the shaping | molding die for plastic lenses, and the manufacturing method of the plastic lens using the said cleaning method.

Plastic lenses are lighter, less brittle and easier to dye than inorganic lenses. In addition, with the improvement of the technology regarding a hard-coating layer and the development of the resin material which has higher refractive index, manufacture of thinner and lighter plastic lens is attained. Due to these technological advances, plastic lenses have been popularized in place of inorganic lenses in many fields, including the field of spectacle lenses.

Conventionally, the resin which is most used as resin which comprises a plastic lens is resin obtained by radically polymerizing diethylene glycol bisallylcarbonate. Recently, however, a resin material having a higher refractive index than this resin has been developed. Typical examples thereof include sulfur-containing resins such as sulfur-containing urethane resins, sulfur-containing epoxy resins, polythio (meth) acrylate resins, sulfur-containing poly (meth) acrylate resins and episulfide resins. The refractive index of the plastic lens base material molded using sulfur containing resin is as high as 1.55 or more.

As a molding die of a plastic lens base material, a pair of glass die is generally used. The pair of molding dies are sealed by a sealing material such as a fixing tape or a gasket, thereby forming a cavity surrounded by the sealing material and a pair of glass dies. A plastic lens base material is obtained by inject | pouring a polymerizable monomer etc. to this cavity and polymerizing-curing a polymerizable monomer. The obtained plastic lens base material is cleaned using a predetermined cleaning composition (see, for example, Japanese Patent Laid-Open No. 2001-129500). On the other hand, about a glass die, it removes after a die | dye, and is used repeatedly many times in order to shape several plastic lenses. Prior to reuse of the glass die, the adhered dirt is removed by use as a forming die. As the dirt adhered to the glass die, for example, the resin constituting the plastic lens base and its unpolymerized product, the plasticizer bleed out from the gasket, the adhesive of the fixing tape, the fingerprint of the operator, the dust in the atmosphere, etc. Can be mentioned.

Among these, the resin is highly crosslinked and is very hard to remove because it is firmly fixed to the glass die.

As a washing | cleaning agent for washing a glass die, the alkali cleaning agent containing alkali chemicals, such as KOH, has been used conventionally. However, when the sulfur-containing plastic lens substrate having a refractive index of 1.55 or more is formed, the resin adhered to the glass die is more firmly attached to the glass die than the resin adhered to the glass die when the plastic lens substrate having a lower refractive index is formed. It is. Therefore, peeling of resin adhered to a glass die is more difficult, and also the amount of adhesion to a glass die is large. Under such a background, detergent compositions exhibiting relatively high detergency with respect to the resin dirt are disclosed in JP-A-2006-124696 and JP-A-2003-81660.

However, the cleaning using the cleaning composition disclosed in Japanese Patent Laid-Open No. 2006-124696 or Japanese Patent Laid-Open No. 2003-81660 has proved that the resin dirt cannot be completely removed.

The present invention provides a method for cleaning a glass die constituting a plastic lens molding die which enables the resin dirt adhered to the plastic lens molding die to be removed well, and a method for producing a plastic lens using the cleaning method.

This invention relates to the cleaning method of the glass die which comprises the shaping | molding die for plastic lenses, and the manufacturing method of the plastic lens using the said cleaning method.

The cleaning method of the glass die which comprises the plastic lens molding die of this invention,

The glass die contains at least one phenyl ether selected from phenyl ether represented by the following general formula (1) and phenyl ether represented by the general formula (2), and the content of the phenyl ether is 2% by weight or more. The cleaning process of cleaning using the cleaning composition for plastic lens shaping | molding dies which are 20 weight% or less is included.

In Formulas (1) and (2), k is 1 or 2, EO is an oxyethylene group, AO is an oxyalkylene group having 3 and / or 4 carbon atoms,

n1 and n2 are the average added moles, n1 and n2 may be different from each other,

m1 and m2 are average addition moles of PO when AO consists of oxyalkylene groups (PO) having 3 carbon atoms, and average addition moles of BO when AO consists of oxyalkylene groups (BO) having 4 carbon atoms. Number, when AO includes PO and BO, the sum of the average added moles of PO and the average added moles of BO, m1 and m2 may be different from each other,

n1 is a number from 3 to 100, n2 is a number from 3 to 100, m1 is a number from 0 to 0.2 × n1, m2 is a number from 0 to 0.2 × n2,

The arrangement of EO and AO in each of (EO) _n1 (AO) _m1 and (EO) _n2 (AO) _m2 may be block or random,

When AO includes PO and BO, the arrangement of PO and BO may be block or random,

EO may enter in a block or randomly in the arrangement which consists of PO and / or BO.

The manufacturing method of the plastic lens of this invention is a shaping | molding process which shape | molds a plastic lens base material using the shaping | molding die containing a pair of glass die arrange | positioned opposingly at predetermined space | interval, and the said glass die from the said plastic lens base material And a cleansing step of cleaning the glass die by using a cleansing method of the glass die constituting the plastic lens forming die of the present invention after the de-dieing step of de-dieing and the de-dieing step, wherein the pair of glass dies Is repeatedly used after the above cleaning process to mold a plurality of plastic lens substrates.

According to the present invention, there is provided a cleaning method of a glass die constituting a plastic lens molding die which enables the resin dirt adhered to the plastic lens molding die to be removed well, and a manufacturing method of a plastic lens using the cleaning method.

(Embodiment 1)

The cleaning composition for plastic lens molding dies (hereinafter sometimes abbreviated as "cleaner composition") used in the cleaning method of the glass die which comprises the plastic lens molding die of this invention contains a predetermined amount of specific phenyl ether, The resin dirt (hardened | cured material of a plastic lens material) firmly adhered to the glass die which comprises a lens shaping die can be removed favorably.

(Specific phenyl ether)

The specific phenyl ether contained in the said detergent composition is represented by following General formula (1) or following General formula (2).

Provided that k is 1 or 2, EO is an oxyethylene group, AO is an oxyalkylene group having 3 and / or 4 carbon atoms, n1 and n2 are average added moles, n1 and n2 may be different from each other, and m1 and m2 is the average added mole number of PO when AO consists of an oxyalkylene group (PO) with 3 carbon atoms, and is an average added mole number of BO when AO consists of an oxyalkylene group (BO) with 4 carbon atoms. When AO contains PO and BO, the average added mole number of PO and the average added mole number of BO are the sum total, m1 and m2 may be mutually different, n1 is 3-100, n2 is 3 ~ The number of 100, m1 is the number of 0-0.2xn1, m2 is the number of 0-0.2xn2, and EO and AO of each of (EO) _n1 (AO) _m1 and (EO) _n2 (AO) _m2 The arrangement may be block or random, and when AO includes PO and BO, the arrangement of PO and BO may be block or random, and EO is a block or random among the arrays of PO and / or BO. There may be. The average added mole number can be measured by ¹ H-NMR.

When the arrangement of EO and AO is a block, the number of blocks of EO and the number of blocks of AO may be one each, but may be two or more as long as each average added mole number is within the above range. When the number of blocks made of EO is two or more, the number of repetitions of EO in each block may be the same or different. Even when the number of AO blocks is two or more, the number of repetitions of AO in each block may be the same or different. Similarly, when EO enters a block in the arrangement of PO and / or BO, the number of blocks of EO may be one, but may be two or more, and when the number of blocks consisting of EO is two or more, The number of repetitions of EO may be the same or different.

When AO includes PO and BO, when the arrangement of PO and BO is a block, the number of blocks of PO and the number of blocks of BO may be one each, as long as the average added mole number is within the above range, but two or more. It may be. When the number of blocks made of PO is two or more, the number of repetitions of PO in each block may be the same or different. Even when the number of blocks of the BO is two or more, the number of repetitions of the BOs in each block may be the same or different.

In addition, it is preferable that EO be bonded to the oxygen atom (0) constituting the ether bond from the viewpoint of ensuring appropriate water solubility.

From the viewpoint of improving the peelability of the resin dirt adhering to the glass die surface and the solubility of the specific phenyl ether in the aqueous medium in the cleaning composition, preferably n1 is a number of 3 to 70, and m1 is 0 to 0.1 x n1. , N2 is 3 to 70, m2 is 0 to 0.1 × n2, more preferably n1 is 3 to 50, m1 is 0, n2 is 3 to 50, and m2 is 0.

Especially, polyoxyethylene disstyrene-ized phenyl ether, such as polyoxyethylene-3,5-bis (1-phenylethyl) phenyl ether whose n1 = 5-50 and m1 = 0, is n2 = 5-50, m2 = 0. Polyoxyethylene tribenzylated phenyl ether, such as polyoxyethylene-2,4,6-tris (1-phenylmethyl) phenyl ether, is preferable, and polyoxyethylene-3,5 whose n1 = 5-50 and m1 = 0. -Bis (1-phenylethyl) phenyl ether and the like are more preferable.

The said cleaning composition is used for cleaning a glass die in the form of the solution which has the said specific phenyl ether as a main component from a viewpoint of improving the productivity of a plastic lens. In this case, 2 weight% or more is preferable and, as for content of the said specific phenyl ether in a cleaning composition, from the viewpoint of improving the peelability of the resin dirt adhering to the glass die surface, 4 weight% or more is more preferable. Moreover, 20 weight% or less is preferable from a viewpoint of improving rinse property, and 15 weight% or less is more preferable. Therefore, 2-20 weight% is preferable, as for content of specific phenyl ether in a cleaning composition, 2-15 weight% is more preferable, and its 4-15 weight% is further more preferable.

(menstruum)

The solvent contained in the cleaning composition is not particularly limited as long as it can play a role as a solvent, and examples thereof include ultrapure water, pure water, ion-exchanged water, distilled water, and the like. It is preferable and pure water is more preferable. Pure water and ultrapure water can be obtained, for example, by passing tap water through activated charcoal, ion exchange treatment, and distilling the distilled light through a predetermined ultraviolet sterilization lamp or through a filter as necessary. For example, the electrical conductivity at 25 ° C. is, for the most part, 1 μS / cm or less in pure water and 0.1 μS / cm or less in ultrapure water.

As for content of the solvent in a cleaning composition, 80-98 weight% is preferable from a viewpoint of improving waste liquid processability, etc., and caring for the environment, improving stability and handleability of a cleaning composition, and 85-98 Weight% is more preferable, and 85-96 weight% is further more preferable.

(Optional ingredient)

Moreover, the said detergent composition is an antifoamer which suppresses generation | occurrence | production of foam in the washing | cleaning process of components other than what is contained in a normal detergent composition as needed, in the range which does not impair the effect of this invention, The said cleaning composition Water-soluble organic solvents other than the solvent contained in the above, chelating agents such as EDTA, PH regulators, preservatives, rust inhibitors and the like may be contained.

Examples of the antifoaming agent include silicones, higher alcohols, higher fatty acids and salts thereof, Pluronic copolymers, tetragonal copolymers, polyethylene glycols, polypropylene glycols, and the like. It can mix. The content of the antifoaming agent is preferably 0.01 to 3.0% by weight, more preferably 0.05 to 2.0% by weight, still more preferably 0.1 to 1.0% by weight of the total amount of the cleaning composition from the viewpoint of suppressing the generation of bubbles and not inhibiting the rinsability. Do.

When the water-soluble organic solvent is contained in the cleaning composition, the affinity of the specific phenyl ether to the resin soil becomes high. Therefore, the wettability of the cleaning composition to the resin dirt becomes high, and the removal performance of the resin dirt by the cleaning composition is further improved.

Examples of the water-soluble organic solvent include polyhydric alcohols and water-soluble glycol ethers. As polyhydric alcohol, (gamma) butyrolactone, dimethylformamide, dimethyl sulfoxide, ethylene glycol, propylene glycol, etc. are mentioned, for example. As water-soluble glycol ether etc., ethylene glycol monobutyl ether, diethylene glycol monobutyl ether, triethylene glycol, etc. are mentioned. These may be used independently, or may mix and use 2 or more types. Among these, ethylene glycol, diethylene glycol monobutyl ether, or triethylene glycol are preferable from a viewpoint of further improving the affinity of the specific phenyl ether to resin dirt, and the wettability of the cleaning composition to resin dirt, and diethylene glycol monobutyl Ether or triethylene glycol is more preferable. In addition, in this application, a water-soluble organic solvent means melt | dissolving at least 1.5 weight% or more with respect to the water in 20 degreeC.

The content of the water-soluble organic solvent is preferably 5 to 150 parts by weight based on 100 parts by weight of the specific phenyl ether from the viewpoint of imparting sufficient affinity and wettability to the resin composition without deteriorating the stability of the cleaning composition. 10-120 weight part is more preferable, and 50-120 weight part is more preferable.

As a pH adjuster, a basic compound or an acidic compound etc. are mentioned. Examples of the basic compound include ammonia, potassium hydroxide, water-soluble organic amines, and quaternary ammonium hydrooxides. As an acidic compound, inorganic acids, such as sulfuric acid, hydrochloric acid, nitric acid, or phosphoric acid, an organic acid, such as acetic acid, oxalic acid, succinic acid, glycolic acid, malic acid, citric acid, or benzoic acid, etc. are mentioned.

Examples of the preservative include benzalkonium chloride, benzetonium chloride, 1,2-benzisothiazoline-3-one, (5-chloro-) 2-methyl-4-isothiazoline-3-one, hydrogen peroxide, hypochlorite and the like. Can be mentioned.

From the viewpoint of improving the peelability of the resin dirt adhered to the glass die surface by the specific phenyl ether, the pH is preferably adjusted to an appropriate value, but the pH at 25 ° C of the cleaning composition is preferably 5 to 11, 6-10 are more preferable, and 7-9 are more preferable. pH can be measured using a pH meter (Toa Denpa Kogyo Co., Ltd., HM-30G).

In addition, content of each component demonstrated above is content at the time of use, The said cleaning composition may be preserve | saved and supplied in the concentrated state in the range which does not impair the stability. In this case, it is preferable at the point which can manufacture and transport cost low. What is necessary is just to dilute a concentrated liquid with the above-mentioned solvent suitably as needed.

When the said cleaning composition is the said concentrated liquid, 20 weight% or more is preferable and 100 weight% may be preferable from a viewpoint of lowering manufacture and transportation cost of a cleaning composition as content of the specific phenyl ether in the said concentrated liquid. In addition, when diluting the concentrate with a solvent, from the viewpoint of obtaining a uniform solution without gelling, the concentrate preferably contains the above-mentioned suitable water-soluble organic solvent, the content of which is based on 100 parts by weight of phenyl ether in the concentrate. 5-150 weight part is preferable, 10-120 weight part is more preferable, 50-120 weight part is further more preferable.

Next, an example of the preparation method of the said cleaning composition is demonstrated.

The manufacturing method of the said cleaning composition is not restrict | limited at all, For example, it can prepare by mixing a specific phenyl ether, a solvent, and arbitrary components as needed.

(Embodiment 2)

Next, an example of the cleaning method of the glass die using the said cleaning composition, and an example of the manufacturing method of the plastic lens using this method are demonstrated.

1, the flowchart of an example of the manufacturing method of the plastic lens of this invention is shown. The flowchart shown in FIG. 1 demonstrates the manufacturing method of the plastic lens for eyeglasses which is an example of the manufacturing method of the plastic lens of this invention.

As shown in FIG. 1, an example of the manufacturing method of the plastic lens of this invention is the shaping | molding process (S1) of shaping a plastic lens base material, the de-die process (S2), the cleaning process of a glass die (S3), Outer peripheral grinding step (S4) of plastic lens base material, annealing step (S6), inner surface polishing step (S7) of plastic lens base material, dyeing step (S9), hard coating layer A forming step (S13), an antireflection layer forming step (S15), and an antifouling layer forming step (S16) are included.

The inner surface polishing step S7, the dyeing step S9, the antireflection layer forming step S15, and the antifouling layer forming step S16 are not necessarily necessary and may be omitted. In the cleaning process of the plastic lens base material or the plastic lens (S5, S8, S10, S12, S14), pure water or the like is usually used as a rinse liquid.

First, in the molding step S1, a pair of glass dies are arranged to face each other at a predetermined interval, and an annular gasket is disposed between the pair of glass dies, for example. And this state is supported using support tools, such as a clip. Thereby, the molding die for plastic lenses which has a cavity is formed by a pair of glass die and a gasket.

Next, a polymerizable composition is injected into the cavity as a plastic lens base material. Subsequently, the polymerizable composition is polymerized by thermal polymerization, for example.

If the plastic lens base material obtained by superposing | polymerizing a polymeric composition contains 1 or more types of polymeric resins chosen from the group which consists of a sulfur containing urethane resin, a sulfur containing epoxy resin, a polythio (meth) acrylate resin, and an episulfide resin, desirable. If the plastic lens base material contains these resins, a plastic lens having a refractive index of, for example, 1.55 or more can be produced, and a thin plastic lens can be produced.

As a glass die, a well-known thing may be used conventionally as the glass die used for shaping | molding of a plastic lens base material. For example, it is preferable that a glass die consists of chemically strengthened glass in which a part of Na ⁺ in the glass is replaced with K ⁺ by ion exchange, and generates a compressive stress in the vicinity of the surface.

A well-known thing may be used for a gasket conventionally as a gasket which comprises the shaping | molding die of a plastic lens. In addition, a fixing tape may be used instead of the gasket. Also about a fixing tape, you may use a well-known thing conventionally as a tape which comprises the shaping | molding die of a plastic lens.

Next, the support of the molding die by the support tool is released, and the die is removed to remove the molding die from the plastic lens (S2).

Next, the glass die is cleaned (S3). In this glass die cleaning step (S3), cleaning of the glass die using the cleaning composition is performed at least once, preferably at least twice, and rinsing using a rinse liquid is performed at least once, preferably at least twice, More preferably, it is 3 to 13 times. In addition, in the actual glass die cleaning process, the rinse bath may be, for example, 5 to 24 baths, and in most cases, 13 to 18 baths are used, and the glass die is immersed and degreased in these baths. I) is preferably rinsed by repeating 3 to 13 times.

Table 1 below shows an example of the flow of the cleaning process. In the example shown in Table 1, the 1st washing process of first cleaning a glass die using the said cleaning composition is performed with respect to a glass die. Subsequently, a second cleaning step of cleaning the glass die using the cleaning composition is carried out depending on the degree of remaining dirt or reattached dirt, or a rinsing step using a rinse liquid is performed. When a 2nd washing process is performed, a rinse process is performed 1 time or more with respect to a glass die after that, Preferably it is performed in multiple times.

As the rinse liquid used in the rinse step, when the glass die is washed using the above-described water-based cleaning composition, tap water, ion-exchanged water, pure water, and the like are, in principle, preferable in terms of ease of rinsing. However, there is a case where the detergent composition which comes together with the glass die from the washing process is accumulated in the water tank, and the amount thereof is preferably 10% by weight or less, more preferably 5% by weight or less, and more preferably 3 It is below weight%.

The range of the suitable temperature of the cleaning composition may be appropriately adjusted depending on the degree of contamination of the plastic lens substrate and the like. For example, 20 ° C to 90 ° C is preferable from the viewpoint of improving the cleaning property and reducing the amount of water evaporation, and 35 to 80 C is more preferable, and 50-70 degreeC is still more preferable. From the viewpoint of improving the peelability of the resin attached to the glass die surface, the cleaning time is preferably 30 seconds to 60 minutes, more preferably 1 to 30 minutes, still more preferably 2 to 15 minutes, and even more preferably 2 to 5 minutes. .

There is no restriction | limiting in particular about the washing | cleaning method, The well-known method normally used can be used. For example, an immersion method, an immersion oscillation method, an immersion stirring method, an immersion bubbling method, a submerged flow method, an immersion ultrasonic cleaning method, etc. are mentioned.

When cleaning a glass die using the said cleaning agent composition for plastic lens molding dies, the glass die cleaning method of this invention performs a 2nd washing process or a rinse process immediately after a 1st washing process, for example. It is preferable that the temperature of the cleaning composition for plastic lens molding dies used at a 1st washing process is 55 degreeC or more. In a 2nd washing process, when a glass die is wash | cleaned using the cleaning composition for plastic lens molding dies 20 degrees C or more lower than the cleaning composition for plastic lens molding dies used at the 1st washing process, it is preferable. As described above, when the cleaning composition for the plastic lens molding die having a temperature lower than 20 ° C. is lower than the cleaning composition for the plastic lens molding die used in the first cleaning step, the second cleaning step heats the glass die and the resin dirt attached thereto. Shock is given. In the rinsing step, the glass die is preferably rinsed using an aqueous rinse liquid having a temperature lower by 20 ° C or more than the cleaning composition for plastic lens molding die used in the first cleaning step. As described above, when an aqueous rinse liquid having a temperature lower than 20 ° C. is used in the rinsing step than the cleaning composition for plastic lens molding die used in the first cleaning step, heat shock is applied to the glass die and the resin dirt.

When heat shock is provided to a glass die and resin dirt as mentioned above, it is thought that the cleaning composition can be efficiently penetrated into the interface of a glass die and resin dirt using the difference of the thermal expansion rate of a glass die and resin dirt. When the cleaning composition penetrates efficiently into the interface, the peeling of the resin dirt is promoted, and as a result, the cleaning property is estimated to be improved.

In the case where the heat shock is applied to the glass die and the resin dirt attached thereto, the temperature of the cleaning composition used in the first cleaning step is 55 to 55 because of increasing the permeability to the interface between the glass die and the resin dirt of the cleaning composition. 90 degreeC is preferable, 60-80 degreeC is more preferable, and 65-70 degreeC is further more preferable.

When performing a 2nd washing process immediately after a 1st washing process, in a 2nd washing process, it is 20 degreeC or more than the temperature of the cleaning composition used at the 1st washing process in the range of the suitable temperature of the said cleaning composition, Preferably it is 25 It is preferable to clean the glass die using the cleaning composition having a temperature lower than 0 ° C. That is, when the washing | cleaning process using the said cleaning composition for plastic lens forming dies is performed in multiple times, the temperature of the cleaning composition for plastic lens molding dies used at the x + 1st washing | cleaning process is used at the xth washing process. It is preferable that it is 20 degreeC or more, Preferably it is 25 degreeC or more lower than the temperature of the cleaning composition for plastic lens molding dies.

When the rinsing step is performed immediately after the first washing step, in the rinsing step, at a temperature of 20 ° C. or higher, preferably 25 ° C. or lower than the temperature of the cleaning composition used in the first washing step in the following suitable temperature range It is preferable to rinse the glass die using a rinse liquid. That is, the temperature of the rinse liquid used in the first rinsing step of the rinsing step performed after the washing step is 20 ° C. or more lower than the temperature of the cleaning composition used in the cleaning step immediately before the first rinsing step, Preferably it is 25 degreeC or more low. Also in this case, the rinse liquid can be efficiently penetrated into the interface between the glass die and the resin dirt by using the difference in thermal expansion rate of the glass die and the resin dirt. When the rinse liquid penetrates efficiently into the interface, the peeling of the resin dirt is promoted, and as a result, the cleanliness is improved.

In more detail, when a heat shock with a temperature difference of 20 ° C. or more, preferably a temperature difference of 25 ° C. or more is given to the glass die and the resin dirt attached thereto, the resin dirt shrinks, and at least a part of the resin dirt is removed from the glass surface. It is considered to be peeled off, and it is thought that the cleaning composition penetrates into the gap between the newly formed glass surface and the resin dirt, and the peeling of the resin dirt is promoted.

Therefore, heat shock is preferably performed in the above-mentioned cleaning composition in that a more excellent cleaning effect is expressed. Therefore, in the second cleaning step, if the range of the suitable temperature of the cleaning composition is in the range of the cleaning composition used in the first cleaning step, It is preferable to clean the glass die by using a cleaning composition having a temperature lower than or equal to 20 ° C and preferably lower than or equal to 25 ° C. In addition, in the rinse liquid, since the effect by giving a heat shock is obtained if it is just after washing | cleaning with the said cleaning composition, if it is a range of the suitable temperature of a rinse liquid in the rinse process performed immediately after a 1st washing process, You may rinse a glass die using the rinse liquid (pure water etc.) of temperature 20 degreeC or more, Preferably it is 25 degreeC or more lower than the temperature of the cleaning composition used at the 1 washing process. From the viewpoint of further improving the cleanability, the temperature of the rinse liquid used in the rinsing step performed immediately after the cleaning composition or the first rinse step used in the second cleaning step is within the range of the suitable temperature of the cleaning composition or the rinse liquid. It is preferable that it is 25 degreeC or more lower than that of the detergent composition used by a 1st washing process, It is more preferable that it is 30 degreeC or more low, It is further more preferable when it is 40 degreeC or more low.

When heat shock is applied to the glass die and the resin dirt by performing the second cleaning step immediately after the first cleaning step, the heat shock is applied to the glass die and the resin dirt in a plurality of rinse steps performed after the second cleaning step. It is more preferable if it is given. Specifically, in a plurality of rinse steps performed after the second washing step, the rinse is performed in the range of the suitable temperature of the rinse liquid, and the temperature of the rinse liquid used in the Y + first rinse step is Y It is preferable that it is 20 degreeC or more, Preferably it is 25 degreeC or more lower than the temperature of the rinse liquid used at a washing | cleaning process.

In addition, in the rinse step (first rinse step) performed immediately after the second washing step, the rinse step is performed immediately after the first rinse step after rinsing the glass die using an aqueous rinse liquid whose temperature is 55 ° C. or higher. In the (second rinse step), it is preferable to rinse the glass die using an aqueous rinse liquid having a temperature lower by 20 ° C or more than the aqueous rinse liquid used in the first rinse step. Thus, when heat shock is continuously given to a glass die and resin dirt in multiple times, washability improves further.

The glass die with resin dirt is generally cleaned by a multi-stage bath system in which many baths are arranged in series. About 20-30 glass dies are put into one jig, and are automatically immersed in each bath by a conveyor automatically. The movement time of the glass die from the bath to the bath is generally about 10 to 60 seconds. From the viewpoint of effectively obtaining the effect of the heat shock application, the movement time is preferably shorter, but preferably within 30 seconds. More preferably within 20 seconds, more preferably within 10 seconds. The whole multi-stage bath system is disposed at room temperature, specifically in an atmosphere of 20 to 30 ° C.

In addition, there may be a case where the temperature of the glass die or the resin waste drops between the movement of the glass die from the bath to the bath, and the liquid temperature in the next bath (heat shock bath) is 20 than the temperature of the glass dyna resin immediately before entering the bath. It is preferable that it is temperature lower than 25 degreeC, More preferably, it is 25 degreeC or more.

Rinse conditions, such as the temperature of a rinse liquid and a rinse time, are not specifically limited, either, According to the grade of the residual or reattachment of the cleaning composition to a glass die, etc., it can adjust suitably. For example, 5-75 degreeC is preferable, as for the suitable temperature range of a rinse liquid, 20-60 degreeC is more preferable from a viewpoint of rinse property and the water evaporation amount reduction, and 30-50 degreeC is still more preferable. In addition, one rinse time is generally 30 seconds to 20 minutes.

As the rinsing method, a known rinsing method that is usually used can be used. For example, various rinsing methods such as immersion method, ultrasonic cleaning method, immersion ultrasonic cleaning method and immersion rocking method can be used alone or in combination.

While the glass die is cleaned, the outer periphery of the plastic lens base material is ground (S4) (see FIG. 1). The grinding method may be either wet or dry. Subsequently, after removing grinding | polishing waste etc. from a plastic lens base material by washing | cleaning (S5), a plastic lens base material is heat-treated (not annealed) and a plastic lens is obtained (S6).

Subsequently, one surface of the plastic lens is polished as necessary (S7). By passing through this process, a plastic lens can be made into a desired frequency. Subsequently, the abrasive is removed using pure water or the like to clean the plastic lens (S8).

Next, the plastic lens is dyed as necessary (S9), and then the plastic lens after dyeing is cleaned using pure water or the like (S10). Dyeing may be conventionally performed using a well-known dye solution and a dyeing method.

Next, it harmonizes by etching both main surfaces of a plastic lens (S11). Harmonization is performed to improve the adhesion between the hard coat layer and the plastic lens. As the etching solution, for example, an aqueous alkali solution is used. Next, after rinsing and cleaning the plastic lens using pure water or the like (S12), a hard coat layer is formed on both main surfaces (S13). What is necessary is just to form a hard coat layer using the well-known material and formation method conventionally.

Next, after cleaning the plastic lens using pure water or the like (S14), the antireflection layer and the antifouling layer are formed in this order (S15, S16). Formation of a hard coat layer and formation of a contamination prevention layer may be performed using a conventionally well-known material and a formation method, respectively.

As mentioned above, although the example of the manufacturing method of the plastic lens for eyeglasses, and the example of the cleaning method of the glass die used for this were demonstrated, the use of a plastic lens is not limited to this. This invention is applicable also to the manufacturing method of the plastic lens for illumination, a camera, or an optical element, and the cleaning method of the glass die used for these, for example. Moreover, the form of a plastic lens is not specifically limited, For example, any may be a spherical lens, an aspherical lens, a progressive lens.

Moreover, the cleaning method of the glass die of this invention, and the manufacturing method of the plastic lens using this method are especially the manufacture of the sulfur-containing plastic lens of refractive index 1.55 or more, and the manufacture of the sulfur-containing plastic lens of refractive index 1.60 or more, and the sulfur containing of 1.70 or more refractive index It is used suitably in manufacture of a plastic lens.

<Example>

[Test piece]

A glass die with a sulfur-containing urethane resin filth, which is a plastic lens resin (MR-8 resin) having a diameter of about 5 mm on the surface which contributes to the molding of a plastic lens of a glass die of about 8 cm in diameter chemically strengthened with potassium nitrate. The Mitsui Chemicals Co., Ltd. product, the sulfur-containing urethane resin system, and the thing which shape | molded 10 mass (resin dirt) of refractive index 1.60 (0.05g / diameter per 1cm) were prepared. In addition, plastic lens resin is 6 hours in 30 degreeC atmosphere, 7 hours in 40 degreeC atmosphere, 3 hours in 50 degreeC atmosphere, 2 hours in 60 degreeC atmosphere, 3 hours in 100 degreeC atmosphere, 120 degreeC atmosphere, It superposition | polymerizes and solidifies by heating for 24 hours in total for 3 hours under the following.

[Adjustment of Cleaning Composition]

Various cleaning composition (Examples 1-15, Comparative Examples 1-8) which pH is between 7-9 by the composition (composition ratio unit weight%) shown in Table 2 is prepared, and it uses a glass die ( Test piece) was washed to evaluate the washability of the cleaning composition.

[Cleaning test]

A glass die (test piece) with a sulfur-containing urethane resin filth was immersed in the cleaning compositions of Examples 1 to 15 and Comparative Examples 1 to 8 maintained at a predetermined temperature, and an ultrasonic cleaning device (manufactured by Sharp, Inc., trade name: SILENTSONIC UT-204, 39 Hz, 200 W) for 2 minutes (first bath).

Subsequently, the glass die was immersed in the cleaning compositions of Examples 1 to 15 and Comparative Examples 1 to 8 held at a predetermined temperature, and ultrasonic cleaning devices (39 ㎑, 200 W, such as the ultrasonic cleaning device used for cleaning in the first bath). ) For 2 minutes (second bath). In addition, the movement time of the glass die from the bath to the bath was 10 seconds.

Subsequently, the glass die was immersed in ion-exchanged water at a predetermined temperature, and two baths (third bath and third bath) were used using an ultrasonic cleaning device (39㎑, 200W) similar to the ultrasonic cleaning device used for cleaning in the first bath. 4 bath) each for 2 minutes.

Subsequently, the glass die was immersed in ion-exchanged water at room temperature, and four baths (5th to 8th) using an ultrasonic cleaning device (39 ㎑, 200 W), such as the ultrasonic cleaning device used for cleaning in the first bath. Each bath for 2 minutes.

Next, after air-blowing for 1 minute, it dried for 10 minutes by the warm air of 80 degreeC supplied from the blower constant temperature dryer (Toyo Seisakusho, brand name: FV-630).

The removal state of the lump of each plastic lens resin was visually observed. As the evaluation criteria of the washability, 10 points were taken when the mass of each plastic lens resin was completely removed, 5 were taken when some were removed, and 0 was taken when not removed at all. The said observation was performed about ten lumps of each plastic lens resin, and the sum total of the said score with respect to ten lumps of plastic lens resin is shown in Table 2 as an index which shows washing property. The larger the total value of the scores, the better the cleaning performance and the better the plastic lens resin is removed.

From the results shown in Table 2, when a cleaning composition comprising at least one phenyl ether selected from phenyl ether represented by the general formula (1) and phenyl ether represented by the general formula (2) is used, Even when heat shock is not given to a glass die, it turns out that the resin dirt adhering to a plastic lens molding die can be removed favorably. Furthermore, heat shock is imparted to the resin dirt and the glass die while using the cleaning composition comprising at least one phenyl ether selected from phenyl ether represented by the general formula (1) and phenyl ether represented by the general formula (2). The lower surface of the resin lens die attached to the plastic lens molding die can be removed more favorably.

As mentioned above, according to this invention, the cleaning method of the glass die which comprises the plastic lens molding die which makes it possible to remove the resin dirt adhered to a plastic lens molding die favorably, and the manufacturing method of the plastic lens using the said cleaning method. Can be provided.

This invention is used suitably for the washing | cleaning process at the time of manufacturing plastic lenses, such as eyeglass lenses, for example.

The present invention can be implemented in other forms without departing from its spirit or essential features. The embodiments disclosed herein are intended to assist the description in all respects and are not intended to be limiting. The scope of the present invention is shown by the attached claim rather than the detailed description mentioned above. And changes within the scope and means equivalent to the claims are intended to be included in the claims.

1 is a flowchart illustrating an example of a method of manufacturing a plastic lens of the present invention.

Claims (6)

As the cleaning method of the glass die which comprises a plastic lens shaping die, The glass die contains at least one phenyl ether selected from phenyl ether represented by the following general formula (1) and phenyl ether represented by the general formula (2), and the content of the phenyl ether is 2% by weight or more. A cleaning method for cleaning a glass die constituting a plastic lens molding die, comprising a cleaning step of cleaning using a cleaning composition for a plastic lens molding die which is 20% by weight or less. [Formula 1]

Provided that k is 1 or 2, EO is an oxyethylene group, AO is an oxyalkylene group having 3 and / or 4 carbon atoms, n1 and n2 are the average added moles, n1 and n2 may be different from each other, m1 and m2 are average addition moles of PO when AO consists of oxyalkylene groups (PO) having 3 carbon atoms, and average addition moles of BO when AO consists of oxyalkylene groups (BO) having 4 carbon atoms. Number, when AO includes PO and BO, the sum of the average added moles of PO and the average added moles of BO, m1 and m2 may be different from each other, n1 is a number from 3 to 100, n2 is a number from 3 to 100, m1 is a number from 0 to 0.2 × n1, m2 is a number from 0 to 0.2 × n2, The arrangement of EO and AO in each of (EO) _n1 (AO) _m1 and (EO) _n2 (AO) _m2 may be block or random, When AO includes PO and BO, the arrangement of PO and BO may be block or random, EO may enter in a block or randomly in the arrangement which consists of PO and / or BO. The method of claim 1, A second cleaning step or rinse step performed immediately after the cleaning step (first cleaning step) of cleaning the glass die using the cleaning agent composition for plastic lens molding die, The temperature of the said cleaning composition for plastic lens molding dies used at the said 1st washing process is 55 degreeC or more, In the second cleaning step, the glass die is washed using the cleaning composition for the plastic lens molding die having a temperature lower by 20 ° C or more than the cleaning composition for the plastic lens molding die used in the first cleaning step, In the rinsing step, the glass die is rinsed using an aqueous rinse liquid having a temperature lower by 20 ° C or more than the cleaning composition for the plastic lens forming die used in the first cleaning step. How to clean your die. The method of claim 2, In the case where the second cleaning step is performed immediately after the first cleaning step, the method further includes a plurality of rinse steps performed immediately after the second cleaning step, In a rinse step (first rinse step) performed immediately after the second washing step, after the glass die is rinsed using an aqueous rinse liquid whose temperature is 55 ° C. or higher, the step is performed immediately after the first rinse step. In the rinse step (second rinse step), a plastic lens molding die is constructed, wherein the glass die is rinsed using an aqueous rinse solution having a temperature lower by 20 ° C. or more than the aqueous rinse solution used in the first rinse step. To clean the glass die. The method according to any one of claims 1 to 3, The blue-cleaning method of the glass die which comprises the plastic lens shaping die | dye which the said cleaning composition for plastic lens shaping dies further contains a water-soluble glycol ether. A molding step of molding the plastic lens base material using a molding die for plastic lenses including a pair of glass dies disposed to face each other at a predetermined interval; A de-die process of de-dieing the glass die from the plastic lens substrate; After the said die-die process, the cleaning process of cleaning the said glass die using the cleaning method of the glass die which comprises the plastic lens shaping die of Claim 1 is included, The pair of glass dies are repeatedly used after the cleaning process in order to mold the plastic lens substrate a plurality of times. The method of claim 5, As the plastic lens base material, at least one polymerizable resin selected from the group consisting of sulfur-containing urethane resins, sulfur-containing epoxy resins, polythio (meth) acrylate resins, and episulfide resins is used. Method for producing a plastic lens.

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