JP2019117390A - Composite functional polarized lens - Google Patents

Abstract

To provide a method for producing a good polarizing lens of which the adhesion of the interface is good without generating optical spots on a boundary of a lens substrate to be laminated on a polarized lens, yet the addition efficiency of a functional imparting agent such as the absorption of thermochromic, photochromic, and ultraviolet and infrared rays is good.SOLUTION: A composite functional polarized lens A is produced which is constituted in such a way that a first lens base material layer 2 provided on a surface side of a polarized film 1 contains a light absorber such as an ultraviolet absorber, an infrared absorber, a photochromic light absorber or a thermochromic light absorber, and a second lens base material layer 3 containing no light absorber is provided on a back side of the polarized film 1. Resin molding material of the first lens base material layer and the second lens base material layer are each injected from the resin injection hole located on the lower side of the vertically long cavity at the same time, and liquid injection molding is performed while venting from the overflow hole, accordingly optically identifiable interface is not formed due to differences in the flow direction of the resin during molding or differences in the thermal history due to the molding heat received one or more times.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method of manufacturing a multi-functional polarization lens having other specific functions in addition to the polarization function.

  In general, a lens substrate for polarizing glasses is one in which a polarizing element having a polarizing film (film) is integrated with the lens substrate for glasses, and the polarizing film is formed by uniaxially stretching a resin film such as polyvinyl alcohol and iodine And so on.

  The eyeglass lens base for vision correction has a convex lens surface formed on the surface on one side by cast polymerization, and a back surface formed in a concave shape or a planar shape, and is suitable for the consumer as an eyeglass lens. When adjusting to the lens power, the back surface may be ground, and the surface may not be ground and a coating containing some functional component may be applied.

  In order to manufacture a lens substrate for polarizing glasses by a casting method, it is possible to use a polarizing film which has been formed into a hemispherical surface by pressure molding in advance on the inner peripheral side of a ring gasket having the same diameter as the lens substrate. A gap for holding the peripheral edge, leaving a predetermined distance from the front and back surfaces of the polarizing film, integrally fixing a pair of concave / convex lens surface forming molds with the gasket, and setting the lens thickness between the pair of molds There is known a manufacturing method in which a monomer is injected into a (cavity), polymerization is carried out by maintaining the temperature at a required temperature for a required time, and a cured resin and a polarizing element are integrated and molded (Patent Document 1 etc.).

  Moreover, in order to hold | maintain a functional component to the lens base material for spectacles, for example, the coating liquid which disperse | distributed the infrared rays absorber to binder resin is apply | coated on the lens surface in a layer form, this is dried, and an infrared rays absorption layer is formed. A method is known (Patent Document 2)

  However, in the above-described conventional spectacle lens technology, when the infrared absorbent is coated on the surface of the lens, the optical properties of the lens substrate must not be degraded, and the thickness of the layer of the coating is therefore required. If the thickness is made as thin as possible, the required functions such as the desired infrared absorption performance can not be sufficiently exhibited.

  In addition, when an expensive functional imparting agent such as an ultraviolet or infrared absorber is dispersedly held on a lens substrate for vision correction corresponding to myopia etc., the lens substrate is obtained by a grinding operation for obtaining a required lens power. Since most of the added is discarded, most of the added functionalizing agent is discarded without fulfilling its function, and the efficiency of adding the functionalizing agent is poor, which causes a rise in manufacturing costs. There is a problem.

  To address such problems, the inventors of the present application have included in the earlier patent application a polarizing element formed by covering both sides of a polarizing film with a polyurethane resin containing an infrared absorber, and an infrared absorber. And the lens base material for eyeglasses used for grinding of lens power adjustment, which is formed by insert molding of polyurethane resin material, and the polarizing element is integrally formed on one side of the lens base material for eyeglasses To prepare a lens substrate for infrared absorbing polarizing glasses (Patent Document 3).

JP 2001-311804 A JP, 2005-43921, A Patent No. 5075080

  However, as described above, the polarizing element is formed by covering the both sides of the polarizing film with the resin containing the infrared ray absorbing agent, and the lens base material for eyeglasses used for grinding for adjusting the lens power is inserted and molded. When lens base materials for lenses are manufactured, the resins for forming the front and back surfaces of the polarizing element are hardened in advance, and an uncured resin layer is formed on them, so that depending on the type of resin, lamination and integration may be sufficient. In some cases, it is not good, and in particular, diethylene glycol bisallyl carbonate (CR-39) has a problem that integration by lamination tends to be uncertain.

  In addition, at the boundary between the resin layer on the surface of the polarizing element prepared in advance and the resin layer formed by being superimposed on the resin layer at the time of insert molding, the difference in the flow direction of the resin at the time of molding An optically distinguishable interface is formed due to a difference in thermal history due to the heat of molding received. Then, when such a spectacle lens forms a polished surface that intersects the interface for so-called “degree processing”, a thin shadow along the interface on the polished surface (ring-shaped thin shadow around the entire lens) Is visually recognized, and the quality such as uniform transparency of the lens for glasses is impaired.

Therefore, the object of the present invention is to solve the above-mentioned problems, and optical spots do not appear at the boundary of the lens substrate laminated on the polarized lens, and the adhesion of the interface is good, and furthermore, the thermochromic and photochromic It is an object of the present invention to provide a multi-functional polarization lens which has a high addition efficiency of functionalizing agents such as ultraviolet and infrared light absorption and can sufficiently secure these additional functions.
In addition, in the case of insert-molding (casting-molding) a polarizing film, it is not limited to the type of resin in particular, and a composite functional polarizing lens having good adhesion and integration by lamination is obtained.

  In order to solve the above-mentioned problems, in the present invention, a lens substrate layer containing the same predetermined resin as a main component is simultaneously provided integrally on both the front and back sides of the polarizing film by insert molding. A method of producing a polarized lens, comprising: adding a light absorbing agent as an additive component to the first lens base layer provided in the first layer; and providing a second lens base layer not containing the light absorbing agent on the other surface side A pair of molds are liquid-tightly fitted to the cylindrical gasket holding the edge of the polarizing plate at intervals from the polarizing film, and one resin injection hole on each side is used on both sides of the polarizing film. A through hole is provided, and an overflow hole is opened through a wall surface of the gasket at a position facing the resin injection hole of the gasket, and an opposing surface of the pair of molds is provided. Respective resin molding materials of the first lens substrate layer and the second lens substrate layer are simultaneously injected from the resin injection hole located under the longitudinally long cavity formed between, and degassing from the overflow hole It is the manufacturing method of the composite functional polarization lens which cast-molds while doing.

  In the multi-functional polarization lens of the present invention configured as described above, both surfaces of the polarizing film used for insert molding are not coated and cured with resin beforehand, and are formed between the opposing surfaces of a pair of molds The respective resin molding materials of the first lens substrate layer and the second lens substrate layer are simultaneously injected from the resin injection hole located below the vertically elongated cavity, and cast molding while degassing from the overflow hole By molding the both sides of the polarizing film simultaneously with the same predetermined resin, the heat history of the predetermined resin forming the polarizing film and the lens base layer before this insert molding, and the resin at the time of preforming and insert molding An optically distinguishable interface is not formed due to differences in flowability and the like.

Therefore, even if a polished surface intersecting this interface is formed, a thin shadow along the interface is not formed on the polished surface, and the adhesion of the interface is good.
In particular, even when diethylene glycol bisallyl carbonate (CR-39) is used as the predetermined resin, the polarizing film and the substrate layer can be reliably integrated.

  Then, the first lens base layer provided on one side of the front and back sides of the polarizing film contains a light absorbing agent as an additive component, and the other side is a second lens base layer not containing the light absorbing agent. When forming a weighted lens for vision correction, the second lens base layer containing no light absorbing agent is ground to grind the first lens base layer containing the light absorbing agent. As a result, the light absorbing agent can be efficiently used to reduce the cost as much as possible.

  In this way, by setting the light absorbing agent to a complex functional polarizing lens in which the light absorbing agent is an ultraviolet light absorbing agent, an infrared light absorbing agent, a photochromic light absorbing agent or a thermochromic light absorbing agent, thermochromic, photochromic, ultraviolet light or infrared light can be obtained. The added efficiency of the functionalizing agent such as absorption is high, and it is possible to obtain a multi-functional polarization lens capable of sufficiently securing these additional functions.

  Further, in order to further reduce the amount of grinding grind of the first lens base layer containing the light absorbing agent, the second resin base layer on the other side of the polarizing film does not contain the light absorbing agent at all. The second lens base layer may contain a light absorbing agent of a type different from the light absorbing agent which is an additive component of the first lens base layer. .

  For example, if a photochromic light absorbing agent is contained in the first lens base layer and a thermochromic light absorbing agent is contained in the second lens base layer, the function of the photochromic light absorbing agent decreases. The thermochromic light absorbers can be made to act in the temperature range, and the defects of the light absorbers can be compensated for each other.

  In addition, since both surfaces of the polarizing film are simultaneously molded with the same predetermined resin, even if the predetermined resin is an allyl diglycol carbonate resin which is not good in lamination between the same resins and is easily peelable between layers, the above composite function Polarized polarized lenses can be reliably bonded and integrated by lamination.

  In the present invention, a lens substrate layer made of a predetermined resin is integrally provided on both sides of a polarizing film by insert molding, a light absorbing agent is contained on one side of the polarizing film, and the light absorbing agent is contained on the other side. Because there is no manufacturing method of a composite functional polarized lens, optical spots do not appear at the boundary of the lens substrate laminated to the polarized lens, and the adhesion of the interface is good. Furthermore, thermochromic, photochromic, ultraviolet light and infrared light There is an advantage that the addition efficiency of the functionalizing agent such as the absorption of the above is high, and it is possible to manufacture a polarization lens having multifunctionality that can sufficiently secure these additional functions.

  In addition, in the case of insert-molding (casting-forming) a polarizing film, there is an advantage that the composite functional polarizing lens is not limited to the type of resin in particular, and adhesive integration by lamination is good.

Sectional view of a multifunctional polarizing lens showing an embodiment Top view of gasket used for insert molding of multi-functional polarization lens of embodiment Sectional view of the gasket and the mold in the direction of the line III-III in FIG. Sectional view of a gasket and a mold used for insert molding of a multifunctional multifunctional polarizing lens of another embodiment

Embodiments of the invention will now be described with reference to the accompanying drawings.
As shown in FIGS. 1 to 3, in the embodiment, a lens substrate layer made of an allyl diglycol carbonate resin (manufactured by PPG: CR-39), a urethane resin, and other predetermined resins is inserted on both the front and back sides of the polarizing film 1. An ultraviolet absorber, an infrared absorber, a photochromic light absorber, or a thermochromic light absorber as an additive component to the first lens base layer 2 provided integrally on the front surface side of the polarizing film 1 integrally provided by molding It is a composite functional polarizing lens A in which the second lens base layer 3 containing a light absorbing agent and not containing the light absorbing agent is provided on the back surface side.

This multi-functional polarization lens cast-molds a resin molding material in which both surfaces of the polarizing film 1 have the same predetermined resin as main components simultaneously by insert molding described later.
The polarizing film 1 is obtained according to a well-known manufacturing method. For example, it is preferable to use a film made of polyvinyl alcohol (PVA) containing iodine or an iodine compound or a dye by impregnation or the like and uniaxially stretched.

  The material of the polarizing film 1 is not limited to PVA, and a composite film in which a film made of polyethylene terephthalate (PET) or PVA and a film made of triacetyl cellulose, polycarbonate or the like may be used.

  The polarizing film 1 made of uniaxially stretched PVA or the like is cut into a square shape in accordance with the size of a meniscus lens, and then is formed into a curve (curvature radius) of the lens by well-known pressure molding (press molding). A spherical curved surface is molded along the surface and used for insert molding.

As the predetermined resin, a resin that can be cast-molded of an eyeglass lens can be widely used, including the above-described resin examples. For example, CR-39, which is a representative resin of thermosetting resin such as MMA (methyl methacrylate resin) or PC (polycarbonate resin) having excellent transparency as a thermoplastic resin, and medium refractive index resin (for example, Nippon Oil and Fat: Coporex, refractive index 1.56) contains allyldiglycol carbonate as its component, and is a well-known high refractive index resin in which isocyanate and polythiol are combined (for example, Mitsui Chemicals, Inc .: thiourethane) As a representative example, a thiourethane resin which is a base resin MR-7 and a refractive index of 1.67) can be mentioned.

Examples of the light absorber to be added to a predetermined resin constituting such a lens base include an ultraviolet absorber, an infrared absorber, a photochromic light absorber or a thermochromic light absorber.
Among these, as the UV absorber, known UV absorbers having absorbability for UV wavelength (100 nm to 380 nm) can be used, and the following compounds can be mentioned as specific examples.
(1) 2-hydroxy-4-n-octoxybenzophenone
(2) 4-dodecyloxy-2-hydroxybenzophenone
(3) 2-2'-hydroxy-4-methoxybenzophenone

  When using these UV absorbers, all UV rays of long UV-A (315 to 400 nm), short UV-B (280 to 315 nm) and UV-C (100 to 280 nm) below it Is preferably absorbed.

  The amount of the ultraviolet absorber added is 0.01 to 4 parts by weight, preferably 0.1 to 4.0 parts by weight, and more preferably 0.2 to 40 parts by weight with respect to 100 parts by weight of the resin material constituting the lens substrate. A range of 0.5 parts by weight is suitable because it exhibits ultraviolet absorption with high addition efficiency.

Moreover, the infrared absorber can use the well-known infrared absorber which has absorption about infrared wavelength (780 nm-2500 nm), for example, the following compounds are mentioned.
(1) An infrared absorber comprising N, N, N ', N'-tetrakis (p-substituted phenyl) -p-phenylenediamines, benzidines and their aluminum salts and dimonium salts.
(2) N, N, N ', N'-tetraarylquinone diimmonium salts.
(3) Bis- (p-dialkylaminophenyl) [N, N-bis (p-dialkylaminophenyl) p-aminophenyl] aminium salt.
The addition amount of the infrared absorber is usually 0.05 to 10 parts by weight with respect to 100 parts by weight of the resin material constituting the lens, and 0.1 to 1.0 weight when used for applications other than the light shielding protective device The range of parts is suitable.

The photochromic light absorber is also referred to as a photochromic compound, and examples thereof include known spirooxazine compounds and tetra (or hexa) benzoperopyrene compounds.
The spirooxazine compound tends to weaken the weatherability by ultraviolet light of a short wavelength, and is used in a weatherproof aspect by wrapping the fine particle spirooxazine compound in a light shielding inorganic film and dispersing it in a resin matrix. (Japanese Patent Application Laid-Open No. 63-175071).

  In particular, in order to shorten the response time required for decoloring of the lens due to the photochromic property as much as possible and to suppress the performance deterioration due to ultraviolet light to obtain a photochromic lens having weather resistance, 100 parts by mass of the resin lens It is preferable that a spirooxazine-based photochromic compound, preferably 0.03 to 0.2 parts by mass of the spirooxazine-based photochromic compound represented by the formula 1 is dissolved in tetrahydrofuran and mixed and uniformly dispersed.

  The above photochromic compound is uniformly dispersed in the resin by being dissolved in tetrahydrofuran, so in the case of such a dispersed lens, it may be deteriorated by ultraviolet light that has penetrated to a depth of about 0.5 mm from the surface However, it is difficult to deteriorate up to the deep part of the resin. Therefore, the lens as a whole becomes a photochromic lens provided with weather resistant characteristics.

The thermochromic light absorber is a compound whose light absorption changes depending on temperature, and examples of the thermochromic compound having such characteristics include leuco dyes and liquid crystal particles.
Specific examples of the thermochromic liquid crystal include cholesteryl nonanoate and cyanobiphenyl. Examples of leuco dyes include spirolactone, fluoran, spiropyran, fulgide, and combinations thereof. The liquid crystal and leuco dye may be microencapsulated and mixed in the polymerizable mixture.

  The amount of thermochromic compound used can be adjusted to an effective amount to achieve a reduction of the transmission (%) at a specific wavelength depending on the amount of material of the lens substrate and the thickness of the lens.

The insert molding implemented in the present invention will be described below.
As shown in FIGS. 2 and 3, in order to insert-mold the polarizing film 1 so as to be embedded in the lens substrate, the inner peripheral surface of the cylindrical gasket 4 formed of a flexible resin such as silicone resin. The peripheral portion of the disk-shaped polarizing film 1 curved in a spherical shape along the curve (curvature radius) of the lens is locked to the side surface of the annular convex portion 5 provided so as to protrude inward from the The retaining ring 6 pressed into the inner peripheral surface of the gasket 4 is superimposed on the portion, and the edge of the polarizing film 1 is held between the retaining ring 6 and the annular convex portion 5 retained by the gasket 4 by elastic force. Hold on.

On both sides of the polarizing film 1 in the axial direction of the cylindrical gasket 4, resin injection holes 7 and 8 penetrate the wall surface of the gasket 4 one by one on each side, and the positions where the resin injection holes 7 and 8 oppose each other Overflow holes 9 and 10 are opened through the wall surface.
A pair of molds 11 and 12 in which a concave surface and a convex surface can be disposed opposite to each other according to the lens shape are liquid-tightly fitted to such a gasket 4 with an appropriate distance between the polarizing film 1 and It is elastically fixed by sandwiching it with a spring clip 13 or the like from the direction.
The gap between the concave surface of the mold 11 and the convex surface of the polarizing film 1 can be set to, for example, about 1 mm, or about 2 to 5 mm if necessary, and the convex surface of the mold 12 and the concave of the polarizing film 1 The gap with the surface can be set to, for example, about 8 to 18 mm in a semi-finished product or about 1 to 10 mm in a plano product.

  Then, as shown in FIG. 3, the resin injection holes 7 and 8 are positioned on the lower side, and the two resin injection holes 7 and 8 are formed in the vertically long cavity formed between the opposing surfaces of the two molds. Among them, the resin injection hole 7 on the lens surface side is mixed with a light absorbing agent as an additive component, and a degassed resin material is injected. The resin materials deaerated without containing water are injected, these are completely filled in the cavity while degassing from the overflow holes 9 and 10 respectively, and then heat curing is performed to polymerize the respective resin materials and By curing, it is possible to insert-mold a composite functional polarizing lens having both a specific light absorbing function and a polarizing function.

  When the mold for insert molding configured in this way is used, the first lens base material layer provided on one of the front and back sides of the polarizing film contains a light absorbing agent as an additive component, and the light is provided on the other side. A second lens substrate layer not containing an absorbent can be provided, and the polarizing film 1 can be integrated with the lens substrates 2 and 3 to produce a composite functional polarizing lens having various functions.

Moreover, as shown in FIG. 4, insert molding can also be performed using the gaskets 14 and 15 used by two sets from which the form differs from the above.
That is, a mold 16 for forming the convex surface of the lens and a ring-shaped gasket 14 for holding the same are used as a pair, and a mold 17 for forming the concave surface of the lens and the ring-shaped gasket 15 for holding the same. The resin injection holes 18, 19 and the overflow holes 20, 21 are respectively formed in these gaskets 14, 15 with the other set as a pair, and the surfaces of the gaskets 14, 15 opposite to the mold holding side are made to face each other. And hold the edge of the polarizing film 1 between the facing surfaces and fix it with a spring clip 13 or the like.
Then, the polarizing film 1 is integrated with the first lens base layer 2 and the second lens base layer 3 in the same manner as described above except that such gaskets 14 and 15 and the molds 16 and 17 are used. , Complex functional polarized lenses having various functions can be manufactured.

Example 1
In the insert molding process described above, a predetermined resin is used as a main component for both surfaces of the polarizing film, a light absorbing agent is contained as an additional component in the first lens base layer, and the other surface does not contain the light absorbing agent. Each resin molding material was cast-molded simultaneously from two gates so as to provide a two-lens substrate layer, to manufacture a multi-functional polarization lens.

  That is, a composite function in which a photochromic light absorber (dye) is added to the convex first side lens substrate layer, and a thermochromic dye is contained in the concave second side lens substrate layer instead of the photochromic light absorber. An eyeglass lens (eyeglass lens for vision correction (semi product) or a spectacle lens for plano (planar) was produced.

  For the first lens substrate layer, a spirooxazine-based photochromic compound represented by the formula 1 with respect to 100 parts by mass of a prepolymer (no ultraviolet absorber added) in which polyisocyanate and polyhydroxy compound are reacted (Yamada Chemical Co., Ltd. Product: PSP-33, reddish purple) 0.05 parts by mass, blue-green spirooxazine-based photochromic compound (Yamada Chemical Industry Co., Ltd .: PSP-54) 0.02 parts by mass, orange photochromic compound (Yamada Chemical A product manufactured by Kogyo Co., Ltd .: PSP-92) was dissolved in THF (tetrahydrofuran) in a proportion of 0.06 parts by mass, and then added to the prepolymer, mixed and stirred, and vacuum degassed. Subsequently, to the prepolymer, an aromatic polyamine (MOCA) was added as a curing agent for an equivalent amount to obtain a resin material.

  The second lens base layer is the same as the first lens base layer except that a thermochromic compound (such as cholesteryl nonanoate) is blended instead of the photochromic light absorber using the polyurethane prepolymer used in the first lens base layer. And used as a resin material.

  In cast molding, each resin molding material for the first lens base layer or the second lens base layer is injected into the cavity of the glass mold having the structure described in the embodiment, and the resin molding material is injected at 40 ° C. for 3 hours After maintaining, the temperature was gradually raised to raise the temperature, and after curing for 24 hours at 100 ° C., it was cooled and taken out from the mold to obtain a polarizing lens for multifunctional spectacles.

  Although the polarizing lens for multi-functional spectacles using the thermochromic layer manufactured together in this way has a drawback that the photochromic performance is significantly lowered at high temperature (30 ° C. or higher) in the conventional photochromic light lens. Even when used at a high temperature of 30 ° C. or higher, the contrast was maintained, and the performance was maintained even after the weathering test.

Example 2
In Example 1, in place of the photochromic compound, 1% by mass of a diimmonium-based compound of infrared absorber (manufactured by Nippon Kayaku Co., Ltd .: IRG-022) was added to the polyurethane prepolymer for forming the first lens substrate layer of the convex layer. And the second lens base layer of the concave layer is the same as in Example 1 except that no light absorbing agent is added and a transparent polyurethane prepolymer is used, and the polarizing lens for a complex functional spectacles Was cast molded.

The multi-functional spectacle lens obtained is thinner to about half the thickness obtained by cast molding by conventional two-step polymerization (embodiment of Patent Document 3), and for correction of vision. No ring-like spots were produced even when polishing was performed.

[Example 3]
In Example 2, in place of the polyurethane prepolymer, it is cast-molded using allyl diglycol carbonate resin (CR 39) and maintained at 30 ° C. for 7 hours, then heated gradually to raise the temperature, 80-100 ° C. In the same manner as in Example 2 except for curing for 8 hours, a polarizing lens for multifunctional spectacles was cast and molded.

  Although the obtained polarizing lens for multifunctional glasses for eyeglasses uses allyldiglycol carbonate resin (CR 39), the lamination integration of the convex layer, the concave layer and the polarizing film is good and there is no peeling between layers Also, even when forming a polished surface intersecting all layers, no thin shadow along the interface was observed on the polished surface, and the quality was good.

Comparative Example 1
In Example 1, a photochromic light absorber (dye) is added to the first lens base layer on the convex side, and a thermochromic dye is contained in the second lens base layer on the concave side instead of the photochromic light absorber. However, instead of this configuration, a photochromic dye and a thermochromic dye were mixed and added to the convex first lens substrate layer, and otherwise a polarizing lens for a multifunctional spectacles was produced in the same manner.

  The polarizing lens of Comparative Example 1 obtained in the initial stage showed desired light absorbability even at high temperatures of 30 ° C. or higher, but when exposed to ultraviolet light outdoors for nearly a month, its performance is that of the photochromic dye alone. It has deteriorated to the same level as the one added.

Comparative Example 2
A transparent lens having a thickness of 10 mm was manufactured in advance using the same impact resistant urethane as the urethane resin used in Example 1. Transparent lenses with various curves (one curve, two curves, four curves, six curves, eight curves, etc.) were manufactured in a thickness range of 8 mm to 20 mm.

  Then, when setting the gasket in the glass mold (male type and female type), set the previously manufactured transparent lens on the concave side, and use about 1 mm of impact resistant urethane on both sides of the polarized lens part of about 2 mm thickness. It cast-molded by adding 1 mass% of infrared absorbers.

  In this way, a lens produced by two cast two-step molding (also called two-step polymerization) forms an abrasive surface that intersects the interface between the functional layer and the transparent layer for the purpose of the required vision correction. The light shadow (transparent ring) along the interface was visually recognized even with the lens of the curve.

Comparative Example 3
Transparent lens of 10 mm thickness using allyl diglycol carbonate resin (CR39), transparent lens of various curves (1 curve, 2 curves, 4 curves, 6 curves, 8 curves etc.) in the thickness range of 8 mm to 20 mm Was produced.
Next, when setting the gasket in a glass mold (male and female molds) for insert molding, the transparent lens is set on the concave side instead of the mold, and about 1 mm on each side of the polarized lens part of about 2 mm thickness A light absorber was added to the CR39 monomer of the same as in Example 2 and cast molded.

  The lens thus produced by two-step casting two-step molding (also called two-step polymerization) temporarily appeared to be neatly laminated and integrated, but when left at room temperature for a while, the convex layer The layer between the concave layer and the polarizing film was easily peeled off and was in an unusable state.

  As described above, for example, in the case of manufacturing a spectacle lens having functionality added with an infrared absorber etc., the portion with the degree is made transparent and made in advance, and then it is set on the concave side to perform two-layer cast molding By doing this, the amount of use of the expensive infrared absorber can be saved, and after processing the eyeglass lens for vision correction (semi-part), it is possible to maintain substantially uniform performance even if it is uneven.

  Also, conventionally, it was not possible to add a light absorber with poor weather resistance to lenses for spectacles, but in the multi-functional polarization lens of the present invention, a concave layer is used with a convex layer and a polarizing element having UV cutting performance. Since ultraviolet rays can be prevented from reaching, light absorbers such as dyes having poor weather resistance can be added.

DESCRIPTION OF SYMBOLS 1 Polarization film 2 1st lens base material layer 3 2nd lens base material layer 4, 14, 15 Gasket 5 Annular convex part 6 Ring for latching 7, 8, 18, 19 Resin injection hole 9, 10, 20, 21 Overflow Holes 11, 12, 16, 17 Mold 13 Spring Clip A Multifunctional Polarizing Lens

The present invention, in addition to the polarizing function relates to a composite functional polarizing lens having both other specific functions.

In order to solve the above problem, in this invention, a lens substrate layer whose main component the same predetermined resin against the both sides of the polarizing film provided integrally by insert molding, one side of the front and back surfaces of the polarizing film relative to 100 parts by mass of a predetermined resin constituting the first lens substrate layer provided, the spirooxazine photochromic compound is contained 0.03 to 0.2 parts by weight, a is on the other side the spirooxazine photochromic compound A second lens substrate layer not included is provided .
In this polarizing lens, a pair of molds are liquid-tightly fitted to the cylindrical gasket holding the edge of the polarizing film at a distance from the polarizing film, and one resin on each side on the both sides of the polarizing film An injection hole is provided to penetrate the wall surface of the gasket, and an overflow hole is opened through the wall surface of the gasket at a position facing the resin injection hole of the gasket, and between the opposing surfaces of the pair of molds The resin molding materials of the first lens substrate layer and the second lens substrate layer are simultaneously injected from the resin injection hole positioned below the longitudinally formed cavity to be formed, and degassing from the overflow hole it is a complex functional polarizing lens to cast molding.

For example, 0.03 to 0.2 parts by mass of a spirooxazine-based photochromic compound is contained in 100 parts by mass of a predetermined resin constituting the first lens base layer, and the thermochromic light absorbing agent is used in the second lens base layer In the multi-functional polarization lens containing the above, the thermochromic light absorbing agent can be made to act in a temperature range where the function of the photochromic light absorbing agent decreases, and the defects of the light absorbing agents are mutually compensated. You can also.

In the present invention, a lens base layer made of a predetermined resin is integrally provided on both sides of a polarizing film by insert molding, and a spirooxazine photochromic compound is used as a light absorber on 100 parts by mass of the predetermined resin on one surface of the polarizing film. Since it was made into the manufacturing method of the multi-functional polarization lens which contains 0.03-0.2 mass parts and does not contain the above-mentioned light absorption agent on the other side, it is optical in the boundary of the lens base material laminated on the polarization lens specific plaque has good adhesion of the interface does not appear, deer also photochromic may be added efficiency of functionalizing agent, such as absorption of infrared, composite functionality can be sufficiently secured these additional features There is an advantage that certain polarized lenses can be manufactured.

As the predetermined resin, a resin that can be cast-molded of an eyeglass lens can be widely used, including the above-described resin examples. For example, MMA (methyl methacrylate resin ) having excellent transparency as a thermoplastic resin, CR-39 which is a representative resin of thermosetting resins of castable type , and medium refractive index resin (for example, Nippon Oil and Fats Co .: A refractive index of 1.56) is a well-known high refractive index resin containing allyldiglycol carbonate as its component and compounding isocyanate and polythiol (for example, Mitsui Chemicals, Inc .: thiourethane resin MR-7, A thiourethane resin having a refractive index of 1.67) is also mentioned as a representative example.

Claims (5)

  A lens base material layer containing the same predetermined resin as a main component simultaneously on the front and back sides of the polarizing film is integrally formed by insert molding, and light is added as an additive component to the first lens base layer provided on one side of the front and back sides of the polarizing film. It is a manufacturing method of a polarization lens which contains an absorption agent and provides the 2nd lens base material layer which does not contain the above-mentioned light absorption agent on the other side, and which is said cylindrical polarization which holds an edge of the above-mentioned polarization film A pair of molds are liquid-tightly fitted at intervals from the film, and one resin injection hole on each side is provided on both sides of the polarizing film so as to penetrate the wall surface of the gasket, and the resin injection hole of the gasket is formed. At the opposite position, an overflow hole is opened through the wall surface of the gasket, and the lower side of the longitudinally elongated cavity formed between the opposing surfaces of the pair of molds Production of a multifunctional polarizing lens in which resin molding materials of the first lens substrate layer and the second lens substrate layer are simultaneously injected from the resin injection hole to be placed, and cast molding is performed while degassing from the overflow hole Method.   The method according to claim 1, wherein the light absorbing agent is an ultraviolet light absorbing agent, an infrared light absorbing agent, a photochromic light absorbing agent or a thermochromic light absorbing agent.   3. The composite functional polarizing lens according to claim 1, wherein the second lens base layer on the other side of the polarizing film is a lens base layer containing the predetermined resin containing no light absorbing agent as a main component. Production method.   The method for producing a composite functional polarizing lens according to claim 1, wherein the photochromic light absorber is contained in the first lens substrate layer, and the thermochromic light absorber is contained in the second lens substrate layer.   The method according to any one of claims 1 to 4, wherein the predetermined resin is allyl diglycol carbonate resin.

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