JP2007293030A - Manufacturing method of polarizing lens and polarizing plate used therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a polarizing lens by which a hot press processing can be performed at low temperature with a good workability, the distortion of a polarizing film caused by heat is dramatically decreased and a used material can be reduced to reduce manufacturing cost, and to provide a polarizing plate used therefor. <P>SOLUTION: A film 12 made of triacetyl cellulose is disposed on one surface of the polarizing film 11 and a film 13 made of polycarbonate is disposed on another surface thereof and these films are integrally laminated by applying an adhesive between respective films and subjecting to thermal press-contact to manufacture the polarizing plate 1. Further the polarizing plate 1 is bent to a predetermined curve and is installed in an insert metal mold M, molten polycarbonate P is charged into a cavity produced at a polycarbonate film 13 side, then the molten polycarbonate P is hardened by cooling to form a lens 2 and further is integrally joined to the polarizing plate 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention improves the manufacturing technology of a polarizing lens used for preventing ultraviolet rays and dazzling, and more specifically, can be hot-pressed at a low temperature, has good workability, and plays a role in distortion of a polarizing film due to heat. In particular, the present invention relates to a method for manufacturing a polarizing lens that can reduce the manufacturing cost by reducing the material used, and a polarizing plate used therefor.

  As is well known, polarizing lenses widely used in sunglasses and the like have become mainly composed of a plastic lens and a film-like polarizing plate that are integrally attached. It is produced by placing a plate in an insert mold and injecting molten lens molding resin.

  Conventionally, as such a polarizing plate, for example, a polarizing plate prepared by sandwiching a polarizing sheet between a pair of triacetyl cellulose (hereinafter sometimes referred to as “TAC”) films is disclosed (for example, Patent Document 1).

  However, when such a polarizing plate is used, since the lens resin to be molded and the material of the surface are different, the compatibility is poor, and there is a problem that it cannot be fused and integrated with the lens. Moreover, since it has a multilayer structure using a plurality of TAC films, there is also a complaint that the manufacturing cost increases.

  Further, as another form of the polarizing plate, a polarizing plate produced by sandwiching a polarizing sheet between a pair of polycarbonate films is disclosed (for example, see Patent Document 2).

However, when such a polarizing plate is used, the polarizing plate may be deformed by a thermal history when exposed to a high temperature in the lens molding process. In addition, there is a problem that stress is generated in the interior during bending, and the material is easily distorted, and further, there is a problem that dyeing is difficult due to the characteristics of the material.
JP 2002-90529 A (page 5-6, FIG. 1-10) JP-A 64-22538 (page 2-3)

  The present invention has been made in view of the above problems in the conventional polarizing lens manufacturing method and polarizing plate, and the object of the present invention is to perform hot press processing at a low temperature. The present invention provides a polarizing lens manufacturing method capable of reducing the distortion of the polarizing film due to heat and dramatically reducing the material used and suppressing the manufacturing cost, and a polarizing plate used therefor. .

  Means employed by the present inventor for solving the above technical problems will be described with reference to the accompanying drawings.

That is, the present invention is a method of manufacturing a polarizing lens in which a polarizing plate 1 configured by laminating a plurality of film materials is joined and integrated with a lens 2,
A film 12 made of triacetyl cellulose is arranged on one side of the polarizing film 11 and a film 13 made of polycarbonate is arranged on the other side, and an adhesive is applied between these films to heat the film. While laminating and integrating to produce polarizing plate 1 by pressure bonding,
This polarizing plate 1 is bent to a predetermined curve and installed in the insert mold M.
Fill the cavity created on the polycarbonate film 13 side with molten polycarbonate P,
Thereafter, the molten polycarbonate P was cooled and cured to form the lens 2 and the technical means of joining and integrating with the polarizing plate 1 was adopted to complete the method for manufacturing a polarizing lens.

  Further, in order to solve the above problems, the present invention adds the above-mentioned means as necessary, so that the triacetyl cellulose film 12 is on the convex surface side of the polarizing film 11 and the polycarbonate film 13 is on the concave surface side. Thus, the technical means of bending the polarizing plate 1 to a predetermined curve was adopted.

  Furthermore, in order to solve the above-described problems, the present invention performs at least one of antireflection processing, antifogging processing, antifouling processing, and mirror processing on the surface of the polarizing lens as necessary, in addition to the above means. The technical means was adopted.

Further, the present invention is a polarizing plate 1 configured by laminating a plurality of film materials used by being integrated with a lens 2 of a polarizing lens,
A triacetyl cellulose film 12 is disposed on one surface of the polarizing film 11, and a polycarbonate film 13 is disposed on the other surface, and an adhesive is applied between each of these films. The polarizing plate of the polarizing lens was completed by employing the technical means of stacking and integrating by thermocompression bonding.

  Further, in order to solve the above problems, the present invention adds the above-mentioned means as necessary, so that the triacetyl cellulose film 12 is on the convex surface side of the polarizing film 11 and the polycarbonate film 13 is on the concave surface side. Therefore, the technical means of bending to a predetermined curve was adopted.

  In the present invention, a triacetyl cellulose film is disposed on one surface of the polarizing film, and a polycarbonate film is disposed on the other surface, and an adhesive is provided between each of these films. While coating and thermocompression bonding to laminate and produce a polarizing plate, this polarizing plate is bent into a predetermined curve and placed in an insert mold, and molten polycarbonate is put in the cavity created on the plastic film side. By filling, the molten polycarbonate can be cooled and cured to form a lens, which can be joined and integrated with the polarizing plate.

  Therefore, it can be hot-pressed at low temperature, has good workability, dramatically reduces the distortion of the polarizing film due to heat, and can reduce the materials used and reduce the manufacturing cost. The industrial utility value is tremendous.

  BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out the present invention will be described in more detail with reference to the drawings specifically shown below.

  An embodiment of the present invention will be described with reference to FIGS. In the figure, what is indicated by reference numeral 1 is a polarizing plate, and this polarizing plate 1 is formed by laminating a plurality of film materials. Specifically, triacetyl cellulose is formed on one surface of the polarizing film 11. A film 12 is disposed, and a polycarbonate film 13 is disposed on the other surface.

  As the polarizing film 11, a uniaxially stretched sheet of a resin sheet such as polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral or the like having a substantially uniform thickness of 0.1 mm or less, or a formalized product thereof is adopted. The degree of polarization is preferably 80% or more. At this time, in order to obtain a high degree of polarization, the uniaxially stretched sheet can be doped with iodine or a dichroic dye.

  The triacetyl cellulose film 12 and the polycarbonate film 13 respectively disposed on the surface of the polarizing plate 11 are film-like members formed by extrusion molding or solvent method casting.

  It is known that triacetylcellulose (TAC), which is a material used for the film 12, has a low photoelastic coefficient and low optical anisotropy.

  Next, the polycarbonate film 13 of the polarizing plate 1 will be described. The polycarbonate film 13 desirably has as little optical anisotropy as possible, and employs a film having high transparency, colorlessness, high impact resistance, and high heat resistance.

  Examples of the material used for the polycarbonate film 13 include polybisphenol A carbonate. In addition, 1,1′-dihydroxydiphenyl-phenylmethylmethane, 1,1′-dihydroxydiphenyl-diphenylmethane, A homopolymer polycarbonate of 1,1′-dihydroxy-3,3′-dimethyldiphenyl-2,2-propane, a copolymer polycarbonate of each other, and a copolymer polycarbonate of bisphenol A can also be employed.

  By the way, it is generally known that polycarbonate has a drawback that birefringence tends to be large, and optical anisotropy due to molding distortion and local orientation tends to occur inside the molded body. Therefore, when using polycarbonate in the present invention, it is important to prevent the formation of optical anisotropy as much as possible, and as a countermeasure against this, the fluidity is high and it is difficult to receive excessive shearing force during molding, that is, residual strain and It is preferable to use a resin having a relatively low degree of polymerization that is less likely to cause local orientation. Therefore, in this embodiment, a polycarbonate material having a polymerization degree of 120 or less, more preferably a polymerization degree of 100 or less is employed.

  Also, what is indicated by reference numeral 2 is a lens, and this lens 2 is made of a polycarbonate material and is the same material as the polarizing plate 1 and can be thermally bonded. Examples of the lens 2 include a convex lens, a concave lens, a single focus lens (for distance, near and presbyopia, etc.), a multifocal lens, a progressive power lens, a lens with a degree, and a lens without a degree.

  Thus, a method for producing the polarizing lens of this embodiment will be described. The present embodiment is a method for manufacturing a polarizing lens in which a polarizing plate 1 constituted by laminating a plurality of film materials is joined and integrated with a lens 2, and is first made of triacetyl cellulose on one surface of a polarizing film 11. A film 12 is disposed, and a polycarbonate film 13 is disposed on the other surface, and an adhesive (or adhesive material) is applied between these films and thermocompression-bonded so as to be laminated and integrated. Thus, the polarizing plate 1 is prepared.

  As this adhesive, isocyanate type, polyurethane type, polythiourethane type, epoxy type, vinyl acetate type, acrylic type, wax type can be adopted, and as the adhesive, vinyl acetate type, acrylic type can be used. System type can be adopted.

  These adhesives or pressure-sensitive adhesives can be applied by a known gravure coating method, offset coating method or the like. At this time, the thickness of the adhesive layer or the pressure-sensitive adhesive layer is about 0.1 to 100 μm.

  At this time, in order to improve the bonding force of the adhesive layer or the pressure-sensitive adhesive layer, the surface of each film may be subjected to chemical chemical treatment with acid, alkali, etc., ultraviolet treatment, plasma discharge or corona discharge treatment. it can.

  Next, the polarizing plate 1 is bent to a predetermined curve. In the present embodiment, heat press molding is performed into a spherical shape so that the triacetyl cellulose film 12 is on the convex surface side of the polarizing film 11 and the polycarbonate film 13 is on the concave surface side.

  Then, the polarizing plate 1 thus bent is placed in the insert mold M (see FIG. 2), and the molten polycarbonate P is filled in the cavity created on the polycarbonate film 13 side.

  Thereafter, the molten polycarbonate P is cooled and cured to form the lens 2 and can be joined and integrated with the polarizing plate 1. At this time, by appropriately changing the shape of the insert mold M, the lens 2 can be a convex lens, a concave lens, a single focus lens (for distance, near, presbyopia, etc.), a multifocal lens, a progressive power lens, It can be made into a lens with a degree or a lens without a degree.

  In the polarizing lens in the present embodiment, the visible light transmittance is in the range of about 10 to 80%. This is because if it is less than 10%, the field of view becomes too dark, and conversely if it exceeds 80%, the antiglare effect is reduced. In order to realize such a range of visible light transmittance, at least one of the polarizing plate 1 and the lens 2 or an adhesive (or pressure-sensitive adhesive) may contain a dye such as a dye or pigment. it can.

  The dye may be either a dye or a pigment, but the dye is more preferable in terms of high transparency, and the pigment is more preferable in terms of long-term durability against water, heat, light, and the like. Regarding the types of dyes and pigments used in the present invention, the following various materials can be selected as long as they have long-term durability against discoloration and the like.

  Examples of dyes include azo, anthraquinone, indigoid, triphenylmethane, xanthene, and oxazine dyes, and pigments include organic pigments such as phthalocyanine, quinacridone, and azo, ultra Inorganic pigments such as marine blue, chrome green, and cadmium yellow can be employed.

  In the present embodiment, antireflection processing can be performed on the surface of the polarizing lens as necessary. This antireflection processing is carried out by laminating about 2 to 8 layers of inorganic films having different refractive indexes between adjacent layers on the hard coat by a vacuum vapor deposition method or the like by an optical film thickness or by a wet method. An organic film having a thickness of about one layer is stacked with an optical film thickness.

  Furthermore, in the present embodiment, the surface of the polarizing lens can be antifogged as necessary. This anti-fogging process provides a hydrophilic resin such as polyvinyl alcohol or polyvinyl pyrrolidone with a film thickness of about 1 to 50 μm. In the case of an acetylcellulose resin, the surface is saponified.

  Furthermore, in the present embodiment, antifouling processing can be applied to the surface of the polarizing lens as necessary. This antifouling process prevents contamination by organic substances such as fingerprint stains on the antireflective film, and can be easily wiped off by using a vacuum deposition method or a wet method to remove fluorinated organic compounds from several tens of nm. It is applied with a film thickness of several μm.

  Furthermore, in the present embodiment, the surface of the polarizing lens can be mirrored as necessary. In this mirror processing, a metal film such as aluminum, silver, gold, or platinum can be provided on the hard coat by a vacuum deposition method or the like.

  Although the embodiments of the present invention are generally configured as described above, the present invention is in no way limited to the illustrated embodiments, and various modifications can be made within the scope of the claims. For example, as shown in FIGS. 3 and 4, the unevenness of the polarizing plate 1 and the lens 2 can be reversed, and belongs to the technical scope of the present invention.

It is explanatory sectional drawing showing the polarizing lens of embodiment of this invention. It is explanatory sectional drawing showing the metal mold | die used for embodiment of this invention. It is explanatory sectional drawing showing the modification of the polarizing lens of embodiment of this invention. It is explanatory sectional drawing showing the modification of the metal mold | die used for embodiment of this invention.

Explanation of symbols

1 Polarizing plate
11 Polarizing film
12 Triacetylcellulose film
13 Polycarbonate film 2 Lens M Insert mold P Molten polycarbonate

Claims (5)

A polarizing lens manufacturing method in which a polarizing plate 1 formed by laminating a plurality of film materials is bonded and integrated with a lens 2,
A film 12 made of triacetyl cellulose is arranged on one side of the polarizing film 11 and a film 13 made of polycarbonate is arranged on the other side, and an adhesive is applied between these films to heat the film. While laminating and integrating to produce polarizing plate 1 by pressure bonding,
This polarizing plate 1 is bent to a predetermined curve and installed in the insert mold M.
Fill the cavity created on the polycarbonate film 13 side with molten polycarbonate P,
Thereafter, the molten polycarbonate P is cooled and cured to form the lens 2 and is joined and integrated with the polarizing plate 1.   The polarizing plate according to claim 1, wherein the polarizing plate 1 is bent into a predetermined curve so that the film 12 made of triacetyl cellulose is on the convex surface side of the polarizing film 11 and the film 13 made of polycarbonate is on the concave surface side. Lens manufacturing method.   3. The method of manufacturing a polarizing lens according to claim 1, wherein at least one of antireflection processing, antifogging processing, antifouling processing, and mirror processing is applied to the surface of the polarizing lens. A polarizing plate 1 configured by laminating a plurality of film materials used by being integrated with a lens 2 of a polarizing lens,
A triacetyl cellulose film 12 is disposed on one surface of the polarizing film 11, and a polycarbonate film 13 is disposed on the other surface, and an adhesive is applied between each of these films, A polarizing lens polarizing plate, wherein the polarizing plate is laminated and integrated by thermocompression bonding.   5. The polarizing lens according to claim 4, wherein the film is bent to a predetermined curve so that the triacetyl cellulose film 12 is on the convex surface side of the polarizing film 11 and the polycarbonate film 13 is on the concave surface side. Polarizer.

Images