JP2009198580A - Manufacturing method for polarizing lens and polarizing lens - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing method for a polarizing lens for preventing the occurrence of distortion of the polarizing lens irrespective of annealing processing at temperature and for time being sufficient for removing residual strain. <P>SOLUTION: In this manufacturing method for the polarizing lens for cutting a molded body having the same shape as the lens out of a polarizing laminated sheet composed of a polarizing sheet and a protection film provided on a surface of the polarizing sheet and sticking this molded body onto a surface of the lens, the polarizing sheet formed by sandwiching the polarizing film 3 between cellulose triacetate films 2 and 2 is prepared, polycarbonate films 4, 4 are stuck onto both faces of the polarizing sheet by using adhesive to form the polarizing laminated sheet, and a part having the same shape as the lens 1 is cut out of the polarizing laminated sheet and is molded into the same shape as the lens 1 to form the molded body, which is stuck onto the surface of the lens 1, and the molded body and the lens are annealed to remove residual strain. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a polarizing lens manufacturing method and a polarizing lens, and in particular, a polycarbonate (PC) film is attached to the surface of a polarizing sheet formed by sandwiching a polarizing film such as a polyvinyl alcohol (PVA) film between cellulose triacetate (TAC) films. The present invention relates to a method for forming a polarizing laminated sheet and manufacturing a polarizing lens using the polarizing laminated sheet, and a polarizing lens.

A polarizing sheet formed by sandwiching a polarizing film such as a polyvinyl alcohol (PVA) film between TAC films is generally commercially available as a polarizing plate for a liquid crystal screen, and since it is easily available and inexpensive, sunglasses having a polarizing function. It is also used in the field of eyeglasses and front spectacles.
When the polarizing sheet is used for sunglasses, front spectacles, etc., for example, a polarizing film is formed by laminating a PC film as a protective film on one surface of the polarizing sheet. It is known to form a lens on one surface of the molded body after cutting out the shaped molded body (see Patent Documents 1 and 2).

  Here, in the manufacturing method of the polarizing lens described in Patent Document 1, an adhesive layer is newly applied to the non-adhesive layer of the TAC polarizing sheet, and a thermoplastic resin film (for example, a PC film) is attached. Thus, a polarizing laminate sheet is formed, and a lens molding resin is injection-molded on one surface of the polarizing laminate sheet. Moreover, the manufacturing method of the polarizing lens of patent document 2 is equipped with the polarizing plate formed by laminating | stacking the protective sheet layer comprised by TAC on both sides of the polarizing sheet layer, Laminating | stacking a PC film on one side of the said polarizing plate, The PC film is integrated with the polarizing plate by injection-molding the PC on the film surface of the PC film by an in-mold process.

By the way, the TAC film that is an inorganic material and the PC film that is an organic material have poor adhesion. Plates are also commercially available (see, for example, Patent Documents 3 and 4).
Further, since the PC film has poor solvent resistance, a solvent-free adhesive must be used when bonding to a TAC film or PVA film. Furthermore, since the PC film has residual strain that remains during molding and processing and may crack after bonding, it is necessary to perform annealing treatment at 110 to 120 ° C. for 30 to 90 minutes to remove the residual strain. is there.

However, the solventless adhesive has a problem that the adhesive force is weak and the PC film is easily peeled off from the peripheral portion of the lens. Further, during the annealing process for removing the residual strain, the polarizing laminated sheet may be greatly warped by the PC film, which may cause distortion of the polarizing lens. Therefore, there is a problem that the temperature cannot be raised sufficiently during the annealing process and residual strain cannot be removed sufficiently. Furthermore, when a PC film is attached to a TAC film, there is a problem in that a large amount of warpage occurs in the polarizing laminate sheet, and workability when performing cutting or the like is poor.
JP 2006-168126 A (see summary description) JP 2002-90529 A (refer to the description of claim 12) Japanese Patent Laying-Open No. 2005-55867 (refer to claims 1, 2 and 8) JP 2007-293030 A (refer to the description of claim 1)

  The present invention has been made in view of the above problems. First, even a polarizing laminated sheet in which a PC film is attached to a TAC film does not warp, has excellent workability, and removes residual strain. Providing a polarizing lens manufacturing method and a polarizing lens that do not cause distortion of the polarizing lens even when annealing is performed at a temperature and time sufficient to do the second, and second, the adhesion to the TAC film is strong, An object of the present invention is to provide a method for manufacturing a polarizing lens and a polarizing lens in which the PC film does not easily peel off.

  In order to achieve the first object of the present invention, the invention according to claim 1 is formed from a polarizing laminated sheet comprising a polarizing sheet and a protective film provided on the surface of the polarizing sheet, and having the same shape as the lens. A polarizing lens manufacturing method in which a body is cut out and the molded body is bonded to a lens surface, the polarizing sheet formed by sandwiching a polarizing film with a TAC film is prepared, and PC is attached to both surfaces of the polarizing sheet by an adhesive. A film is bonded to form a polarizing laminate sheet, and a portion having the same shape as the lens is cut out from the polarizing laminate sheet, and the portion is molded into the same shape as the lens to form a molded body. In this method, the residual distortion is removed by bonding the surface of the lens and annealing the molded body and the lens.

As described in claim 2, the polarizing film is preferably PVA.
In order to achieve the second object of the present invention, the invention according to claim 3 is characterized in that the adhesive is an ultraviolet curable adhesive comprising a main component of a polyisocyanate compound and a curing agent of a polyol compound. Manufacturing method.
The polarizing lens of the present invention is a polarizing lens in which a polarizing laminated sheet comprising a polarizing sheet and protective film layers provided on both sides of the polarizing sheet is bonded to the lens surface, as described in claim 4, The polarizing sheet is formed by sandwiching a polarizing film between TAC films, and the protective film layer is composed of a PC film.

In this case, as described in claim 5, the polarizing sheet and the polycarbonate film may be bonded to each other by an ultraviolet curable adhesive comprising a main component of a polyisocyanate compound and a curing agent of a polyol compound.
In the polarizing lens manufacturing method and the polarizing lens of the present invention, the PC film on both sides cancels the warpage of the polarizing sheet at the time of annealing by adhering PC to both surfaces of the polarizing sheet, so that the occurrence of warpage is almost zero. Can be suppressed. Therefore, the residual strain can be almost completely removed by sufficient annealing.
Further, by using the ultraviolet curable adhesive as described in claim 3 and claim 5, the PC film can be firmly adhered to the surface of the TAC film, and the PC film is hardly peeled off. The polarizing lens can be obtained.

  According to the method of the present invention, it is possible to obtain a substantially flat TAC-PC polarizing laminate sheet without warping, and the workability during cutting and the like can be greatly improved. Also, even if annealing is performed at a temperature and time sufficient to remove residual strain, the polarizing laminate sheet does not warp, so there is no risk of distortion of the polarizing lens and peeling of the PC film occurs. It is difficult to obtain a high-quality polarizing lens that has a long lifetime and is inexpensive.

Hereinafter, preferred embodiments of the present invention will be described in detail.
The polarizing sheet used in the present invention is obtained by sandwiching a polarizing film with a TAC film. The polarizing film preferably has a thickness of about 0.03 to 0.05 mm and has a uniform thickness, for example, a film obtained by uniaxially stretching a resin film such as polyvinyl alcohol, polyvinyl acetal, polyvinyl butyral, or the like. It is possible to use a uniaxially stretched product after stabilization treatment. In order to obtain a higher degree of polarization, the above film may be doped with iodine or a dichroic dye.

The TAC film that sandwiches the polarizing film from both sides preferably has a thickness of about 0.1 mm. The TAC film is bonded to both surfaces of the polarizing film with a known adhesive, but it is preferable to use a film having long-term durability against water, heat, light, etc. And polythiourethane, epoxy, vinyl acetate, acrylic, wax, vinyl acetate, and acrylic adhesives. The thickness of the adhesive layer is preferably about 0.1 mm.
Commercially available polarizing sheets as described above can be used, and examples thereof include KC series manufactured by Konica Minolta, “Fujitac” (trade name) manufactured by Fuji Film.

  An adhesive layer for PC film adhesion is formed on both surfaces of the polarizing sheet. As the adhesive, a commercially available product can be used as long as it is suitable for adhesion of a PC film. For example, Clear Luce (registered trademark) MA21 manufactured by Adel Co., Ltd., or an ultraviolet curable adhesive manufactured by Henkel Japan Co., Ltd. In addition to LOCTITE (registered trademark) product number 3311, an ultraviolet curing type TAC-PC adhesive made of a main component of a polyisocyanate compound and a curing agent of a polyol compound manufactured by Onbitt, Korea, one of the applicants of the present application. be able to. The thickness for applying these adhesives on both surfaces of the polarizing sheet is about 0.1 to 100 μm, preferably about 0.5 to 80 μm. In addition, as a method of applying the adhesive on both surfaces of the polarizing sheet, various known methods such as a method of passing the polarizing sheet while supplying the adhesive between the rollers, a method of applying by a dispenser, screen printing, etc. Can be adopted.

The PC film is preferably one in which residual distortion and local orientation are less likely to occur, and is preferably one having a relatively low degree of polymerization. For example, a PC film having a polymerization degree of 120 or less, more preferably a polymerization degree of 100 or less may be used. A commercially available PC film can be used, and examples thereof include Lexan (registered trademark) 8010 manufactured by General Electric.
This PC film is placed on the adhesive layer on both sides of the polarizing sheet and pressed against the adhesive while being pressed with an appropriate pressure. And an adhesive agent is hardened and a PC film is adhere | attached on both surfaces of a polarizing sheet.

A lens-shaped molded body is cut out from the polarizing laminate sheet formed as described above, and formed into a shape corresponding to the convex or concave surface of the polarizing lens to be manufactured by hot pressing or the like.
The lens can be formed on the surface of the molded body by a conventionally known method. For example, the above-mentioned adhesive may be used to adhere the molded body to the surface of a glass or resin lens, or the molded body may be housed in a lens molding die and placed on one surface of the molded body. The lens may be injection molded. When adhering the molded body to the surface of a glass or resin lens, the above-mentioned adhesive for PC film may be used.
Thereafter, annealing is performed by heating the lens at 90 to 120 ° C. for 30 to 120 minutes.

Although the embodiment of the present invention has been described, the present invention is not limited to the above embodiment.
For example, although the above-mentioned polarizing laminated sheet is obtained by sticking PC films one by one on both surfaces of the polarizing sheet, a plurality of PC films can be laminated and stuck. In this case as well, the above-mentioned adhesive may be used for bonding the PC films.

  The present invention can be suitably applied to the manufacture of a polarizing lens having excellent polarization and impact resistance by adhering PC films to both sides of a TAC polarizing sheet. Moreover, the polarizing laminate sheet of the present invention is not limited to the polarizing lens for sunglasses and front spectacles, but can be applied to other fields such as a liquid crystal display.

It is concerning the example of the polarizing lens of this invention, and is the sectional drawing.

Explanation of symbols

1 Lens 2 TAC Film 3 Polarizing Film 4 PC Film

Claims (5)

From a polarizing laminated sheet consisting of a polarizing sheet and a protective film provided on the surface of the polarizing sheet, a molded body having the same shape as the lens is cut out, and this molded body is bonded to the lens surface, and a method for producing a polarizing lens,
Preparing the polarizing sheet formed by sandwiching a polarizing film with a cellulose triacetate film,
Bonding a polycarbonate film with an adhesive on both sides of this polarizing sheet to form a polarizing laminated sheet,
While cutting out the same shape part as the lens from this polarizing laminate sheet, the part is molded into the same shape as the lens to form a molded body,
Glue this molded body to the lens surface,
Annealing the molded body and the lens to remove residual strain;
A manufacturing method of a polarizing lens characterized by the above. The method for producing a polarizing lens according to claim 1, wherein the polarizing film is polyvinyl alcohol. The method for producing a polarizing lens according to claim 1, wherein the adhesive is an ultraviolet curable adhesive comprising a main component of a polyisocyanate compound and a curing agent of a polyol compound. A polarizing lens in which a polarizing laminated sheet comprising a polarizing sheet and protective film layers provided on both sides of the polarizing sheet is bonded to the lens surface,
The polarizing sheet is formed by sandwiching a polarizing film with a cellulose triacetate film,
The protective film layer is made of a polycarbonate film,
Polarizing lens characterized by The polarizing lens according to claim 4, wherein the polarizing sheet and the polycarbonate film are bonded to each other by an ultraviolet curable adhesive comprising a main component of a polyisocyanate compound and a curing agent of a polyol compound.

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