KR100528394B1 - Base sheet of polarizing 0ptical lens and method of manufacturing the same - Google Patents

Abstract

The present invention relates to a polarizing optical lens substrate and a method of manufacturing the same. More specifically, the cellulose acetate is formed on the convex side (object side) around the polyvinyl alcohol polarizer sheet layer prepared by dyeing and stretching the dichroic dye composition or dyeing the dichroic dye composition after the stretching process. The butyrate-based resin sheet is characterized in that a polycarbonate-based resin sheet is laminated on the concave surface side (eyepiece side).

In the polarizing optical lens substrate of the present invention, a composite polarizing plate in which a cellulose acetate butyrate-based resin sheet is laminated on one surface of a polyvinyl alcohol-based polarizer sheet, and a polycarbonate-based resin sheet is laminated on the back surface thereof is manufactured, and then the composite Heat-resistant protective film is attached to both sides of the polarizing plate to protect the composite polarizing plate, and then punched into a disc shape to be cured in a vacuum molding machine, the protective film is peeled off, and then mounted on an injection molding machine. The polycarbonate-based resin can be manufactured by thermal fusion and integration on a polycarbonate-based resin sheet layer on the concave side (eyepiece side), and then a polarizing optical lens for safety glasses can be manufactured by polishing and surface coating by a known method. have.

The polarizing optical lens of the present invention can prevent the optical distortion phenomenon of the prior art generated by using only the polycarbonate resin sheet on both sides of the polarizer sheet while maintaining the features such as mechanical strength and impact strength of the polycarbonate resin. In addition, there is an advantage in that the weakness of the conventional impact strength or mechanical strength generated by using only the cellulose acetate butyrate-based resin sheet on both sides of the polarizer sheet can be improved.

Description

Polarizing optical lens base material and its manufacturing method {BASE SHEET OF POLARIZING 0PTICAL LENS AND METHOD OF MANUFACTURING THE SAME}

The present invention relates to a polarizing optical lens substrate for safety glasses such as sunglasses having excellent optical properties, reducing glare and eye fatigue, and having high impact strength and high safety, and a method of manufacturing the same. More specifically, a cellulose acetate butyrate-based resin sheet is laminated on the convex side of an object centered on a conventional polyvinyl alcohol-based polarizer sheet dyed and stretched with a dichroic dye composition, and a polycarbonate-based resin sheet The present invention relates to a polarizing optical lens base material, a polarizing optical lens for safety glasses based on the same, and a manufacturing method thereof, which are stacked on the eyepiece side which is a concave side.

Goggles and general sunglasses are widely used for the purpose of protecting the eyes from wind, snow, rain, sand, medicine and foreign objects. In particular, polarized lenses (including power lenses) reduce eye fatigue by suppressing glare and optical illusion caused by light scattering, reflection and refraction, and have the ability to see and judge objects instantly and accurately. It is widely used by other leisure populations.

In general, a polarizing lens has a structure in which a laminate such as a protective sheet is laminated on both sides of a polarizer sheet. Such a conventional polarizing lens is manufactured by bonding and processing inorganic glass as a laminating material on both sides of the polarizer sheet, or the same cellulose acetate butyrate (CAB), cellulose triacetate, allyl diglycol carbonate resin on both sides of the polarizer sheet. Polycarbonate (PC) -based resins and the like were mostly laminated and used as protective sheet layers. By the way, the inorganic glass lens has good optical characteristics, but it is heavy, so the wearing feeling is bad, and the impact glass is easy to be damaged due to weak impact strength, which may injure the wearer. Cellulose-based resins such as cellulose acetate butyrate (CAB) have good molding processability, but due to their weak mechanical strength and elasticity, allyl diglycol carbonate resin (melted state) should be reinforced with a certain thickness on the curved surface of the lens during molding. Secondary processing process has to be added, and there have been problems in impact strength and heat resistance.

On the other hand, polycarbonate (PC) -based material is a kind of engineering plastics with excellent mechanical strength, extremely high tensile strength and impact strength, good molding precision, high heat resistance, etc. Although it is a material, it is difficult to apply it to the lens due to the optical distortion caused by the difference in the elongation of each position due to the bending.

In order to solve this problem, a lot of research has been done in the past. In JP-A-64-22538, JP-A-3-39903, JP-A-8-313701, and USP 5,051,309, a polycarbonate sheet is polarized with a difference in retardation due to a difference in draw ratio. We tried to solve this problem by making. In other words, the optical distortion phenomenon was solved by manufacturing a polarizing plate with an object retardation value of 2000 nanometers (nm) or more and an eyepiece side retardation value of less than 2000 nanometers (nm). However, polycarbonate has a very high mechanical strength, so as to produce sheets of different retardation values as described above, there is a problem that industrially has to go through a difficult process. . On the other hand, Japanese Patent Laid-Open No. 2002-90529 discloses a technique in which polarizing lenses are laminated on both sides of a polarizer sheet by laminating laminated materials of different materials such as cellulose stratetate or polycarbonate with a protective sheet, but such separate polarization is disclosed. The above-mentioned problems are still present in the lens manufacturing method.

The present invention is to solve the above problems, of the protective sheet on both sides of the polarizer sheet of the polyvinyl alcohol-based substrate, laminating the cellulose acetate butyrate-based protective sheet on the convex surface side, polycarbonate-based protection on the concave surface side By laminating the sheets, the advantages such as mechanical strength and impact strength of the polycarbonate resin can be utilized as they are, and the optical distortion caused by using only the polycarbonate protective sheet on both sides of the conventional polarizer sheet can be prevented. In addition, the use of cellulose acetate butyrate-based resin protective sheets on both sides of the conventional polarizer sheet also solves the weaknesses such as impact strength and mechanical strength.

The present invention is a cellulose acetate butyrate crab resin sheet is laminated on the convex side (object side) around the polyvinyl alcohol polarizer sheet dyeing and stretched with a dichroic dye composition, the polycarbonate resin sheet is concave side An object of the present invention is to provide a polarizing optical lens base material, which is laminated on the eyepiece side.

Another object of the present invention is to provide a polarizing optical lens derived from the polarizing optical lens base material.

It is another object of the present invention to provide a polarizing optical lens substrate and a method of manufacturing the polarizing optical lens derived therefrom.

The polarizing optical lens substrate of the present invention is a polarizing optical lens substrate composed of different laminates on both sides of a polarizer (pol.) Sheet of a polyvinyl alcohol (PVA) -based substrate ( In the base material), the laminated material on the convex side (object side) is a cellulose acetate butyrate (CAB) -based resin sheet, and the laminated material on the concave side (eyepiece side) is a poly-layer laminate. It is characterized in that the polycarbonate (PC) -based resin layer.

The polarizing optical lens base material of the present invention is a cellulose acetate butyrate-based resin sheet on the convex side (object side) of the polarizer sheet in the center, and the concave side (eye side) of the polarizer sheet. After laminating a polycarbonate-based resin sheet to the protective film by adhering the protective film on both sides of the laminated sheet, and punched into a disc shape to curve (curving) in a lens vacuum molding machine, and then to protect the both sides It can manufacture by peeling a film and heat-sealing and integrating the polycarbonate resin of a molten state on the polycarbonate-type resin sheet of the concave surface side (eyepiece side).

The polarizing optical lens base material of the present invention can be made by using only the polycarbonate protective sheet on both sides of the polarizer sheet while maintaining the features such as mechanical strength and impact strength of the polycarbonate resin. It is possible to prevent the optical distortion phenomenon, as well as to improve the vulnerability, such as the conventional impact strength or mechanical strength caused by using only the cellulose acetate butyrate-based resin protective sheet on both sides of the polarizer sheet.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of the said polarizing optical lens base material of this invention, and its manufacturing method are demonstrated in detail.

The center layer of the said polarizing optical lens base material of this invention consists of the normal polarizer sheet 1 which bases a polyvinyl alcohol-type film. The polarizer sheet 1 may be prepared by dyeing a polyvinyl alcohol-based film with a dichroic dye composition.

In the polarizing optical lens base material of the present invention, a protective sheet is laminated on both surfaces of the polarizer sheet 1 at the center. In the present invention, the protective sheet on the convex side (object side) is composed of a cellulose acetate butyrate resin sheet (4), and the protective sheet on the concave side (eyepiece side) is a polycarbonate system. It is characterized by consisting of the resin sheet (5). The present invention is a conventional polarizing optical lens by replacing and laminating a cellulose triacetate (CTA) resin sheet, which is commonly used as a protective film on the convex side, with a cellulose acetate butyrate (CAB) resin sheet. All problems have been solved.

The polarizer sheet and the protective sheet are laminated and bonded (laminated) by an adhesive in a paper roll. The adhesive may be dipped between the laminated surface of the polarizer sheet and the protective sheet, or may be laminated on one or both surfaces of the polarizer sheet and the protective sheet laminated. The adhesive is preferably a polyvinyl alcohol adhesive (2) when the cellulose acetate butyrate-based resin sheet (4) is laminated on the polarizer sheet (1), and the polycarbonate resin sheet (5) is attached to the polarizer sheet (1). When laminating | stacking, the polyurethane adhesive 3 is preferable. For example, a polyvinyl alcohol solution having a degree of polymerization of 2500 is preferable as the polyvinyl alcohol adhesive, and the polyurethane adhesive is preferably a DS-8000 product from Henkel, Germany, or a U-10FL product from Loctite, USA. .

The lamination of the polarizer sheet and the protective sheet is made by first laminating cellulose acetate butyrate-based resin sheets on the polarizer sheet, and then laminating polycarbonate-based resin sheets on the reverse side thereof, or vice versa. Next, the cellulose acetate butyrate-based resin sheet can be laminated on the back surface. For example, the cellulose acetate butyrate-based resin sheet is first laminated on one surface of the polarizer sheet to obtain a laminated sheet (Pol./CAB laminated sheet) in which the cellulose acetate butyrate sheet is laminated on the polarizer sheet 4. The polycarbonate-based resin sheet is laminated on the rear surface thereof, and a cellulose acetate butyrate-based resin sheet is laminated on one surface mainly on the polarizer sheet, and a composite polarizing plate which is a laminated sheet on which the polycarbonate-based resin sheet is laminated on the other surface (hereinafter) PC / Pol. / CAB laminated sheet ”) or the polycarbonate-based resin sheet is first laminated on one side of the polarizer sheet, and then the cellulose acetate butyrate-based resin sheet is reversed. By laminating a composite polarizing plate (PC / Pol. / CAB laminated sheet) that is a laminated sheet can be prepared.

The composite polarizing plate is adhered to a heat-resistant protective film (masking film) on both sides thereof. For example, a polyvinyl chloride film is adhered to the CAB sheet 4 surface of the composite polarizing plate by a polyvinyl alkyl ether adhesive, and a polypropylene film is adhered to the PC sheet 5 by an acrylic adhesive. A 5-layered composite polarizing plate (see Fig. 1) of “protective film / PC / Pol. / CAB / protective film” is produced.

The five-layered composite polarizing plate is punched into a disc of any size, for example 100 mm in diameter. The disk-shaped composite polarizing plate has a proper curvature radius (usually 87 mm) around the CAB sheet 4 side to the objective side (convex side) and the PC sheet 5 side to the eye side side (concave layer) in a conventional lens vacuum molding machine. It is molded into a lens-shaped curved compound polarizing plate having.

In the lens-shaped curved composite polarizing plate, the protective film adhered to both surfaces thereof is removed, and the polarizing optical lens base material according to the present invention is manufactured by heat-sealing and integrating polycarbonate-based resin on the PC sheet on the concave side. . In the polarizing optical lens substrate according to the present invention, the lens-shaped curved composite polarizing plate from which the protective film has been removed is mounted inside a mold of a conventional injection molding machine for lens manufacturing, and has a polymerization degree of 80 to 100 on the PC sheet side (concave side). A four-layered polarizing optical lens substrate can be produced by subjecting PC resin to injection molding or extrusion filling to heat fusion and integration, then cooling the mold and unwinding the molded article.

The injection molding machine (HUSKY INJECTION M / C) for manufacturing the lens has a mold diameter of 98 mm, a radius of curvature of 87 mm, and a PC resin heat fusion temperature within a mold of 200 to 240 ° C / 2 minutes to 5 minutes, and a melt PC resin insertion pressure of 400 to 450 Kgf / cm 2, body strength: 70 to 80 tons is preferable.

As for the polarizing optical lens base material obtained in this way, the cellulose acetate butyrate sheet 4 is arrange | positioned at the convex surface side (object side) centering on the polarizer sheet 1, and the polymerization degree is 80-100 on the concave surface side (eyepiece side). A laminated structure in which a PC layer having a thickness of 1 to 15 mm integrated with the PC resin layers 5 and 6 is arranged.

The polarizing optical lens of the present invention can be produced through the conventional known lens processing process of the polarizing optical lens substrate. For example, a polarizing optical lens may be formed by polishing a concave surface, forming a silane-based hard coating layer on both surfaces of the lens, performing a reflective film processing by a ZrO ₂ / SiO ₂ lamination method, or forming an antifouling film with a fluorine resin. 2) can be prepared.

The composite polarizing optical lens according to the present invention can obtain an average transmittance (Tv) of 15% and an average polarization of 99% or more at a wavelength of 380 to 720 nm.

Next, an Example is given and this invention is demonstrated concretely.

EXAMPLE

<Polarizer sheet manufacturing example>

1. Preparation of Dichroic Dye Solution

Apollo Direct Yellow Tage 130 {Apollo Direct Yellow TG 130 (color index common name direct dye yellow 11)} 38.4 parts, Best Direct Supra Orange 2GL 125 (Calendex regular name direct dye orange 39) } 22.8 copies, Intralite Fast Red 5B 200 {Intralite Fast Red 5B 200 (Carlinex common name direct dye red 81)} 112.8 copies, Kayarus Supra Blue 4G Dye blue 202)} 326.0 parts were mixed to form a 500 part dye composition.

The dye composition was placed in 80,000 parts of purified water, heated at 80 ° C. to completely dissolve, and then cooled to 50 ° C. to prepare a dichroic dye solution.

2. Preparation of Polarizer Sheet

A 75-micron-thick polyvinyl alcohol film (Kuraray Vinylon VF-X # 7500; Kuraray Co Ltd., Japan) was washed with water at room temperature, and then swollen in warm water at 40 ° C for 1 minute, and then It was deposited for 120 seconds in the dichroic dye solution. Subsequently, the original length was stretched and washed 2.5 times in one direction, and dried for 3 minutes at 50 ° C. under tension to prepare a polarizer sheet 1 having a thickness of 35 μm.

This polarizer sheet was neutral gray, and had an average transmittance of 16% at a wavelength of 380 to 720 nanometers (nm), and an average degree of polarization of 99.9% or more.

3. Lamination of Polarizer Sheet and Protective Sheet (Primary Lamination)

The polarizer sheet 1 prepared above and the cellulose acetate butyrate-based resin sheet having a thickness of 335 µm (Kodak Co., Ltd., glass transition temperature (Tg): 121 ° C) were 3% by weight of polyvinyl alcohol having a polymerization degree of 2500. The solution was used as an adhesive to obtain a lamination sheet (Pol./CAB lamination sheet) in which a lamination roll was laminated and a cellulose acetate butyrate-based resin sheet was laminated on the polarizer sheet 1. The thickness after drying of the adhesive 2 was 10 μm.

4. Preparation of PC / Pol. / CAB Composite Polarizing Plate (Secondary Lamination)

Polycarbonate (PC) sheet of optical thickness 300㎛ (General Electric Co., Ltd., Glass Transition Temperature (Tg): 148 ° C) on one side of polyurethane adhesive (Henkel's DS-8000) with comma coater After applying uniformly, dried at 65-70 ° C. (adhesive thickness: 10 μm after drying), the polyurethane adhesive coated side of the PC sheet and Pol./CAB sheet were laminated on a second lamination roll to form the polarizer sheet. A composite polarizing plate having a thickness of 690 µm having a PC / Pol. / CAB structure in which a PC sheet 5 was stacked on one side of the center (1) and a CAB sheet 4 was stacked on the other side was prepared.

5. Adhesion of Protective Film

The CAB sheet 4 of the composite polarizing plate is bonded to a heat-resistant polyvinyl chloride (PVC) film with a masking film using a polyvinyl alkyl ether pressure sensitive adhesive, and to the surface of the PC sheet 5 is acrylic. The polypropylene film was adhered to the protective film using an adhesive, and then aged for 24 hours to prepare a composite polarizing plate having a 5-layered structure of "protective film / CAB / Pol. / PC / protective film".

6. Curving

The composite polarizing plate was punched into a disk shape having a diameter of 100 mm, and then, in a conventional lens vacuum molding machine, the CAB (4) side was turned into the objective side (convex side) and the PC side (5) into the eyepiece side (concave layer). Under the same conditions, a curved composite polarizing plate having a lens shape having a curvature radius of curvature of 87 mm was prepared.

            -Processing temperature 160 ℃

            -Processing time 20 minutes

            -Degree of vacuum; 50mmHg

7. Polycarbonate press injection, extrusion filling, integration

The protective film on both sides was removed from the curved composite polarizing plate, mounted inside the mold of an injection molding machine having a movable radius of curvature of 87 mm, and then injected with a PC resin having a polymerization degree of 90 on the PC sheet side (concave side). After pressure injection in the molding machine and the conditions, and after thermal fusion molding, the mold was cooled and the molded article was uncoiled to prepare a four-layered polarizing optical lens substrate (see FIG. 1).

{ Injection molding machine for lens manufacturing ( HUSKY INJECTION M / C)}

                 -Die diameter: 98mm radius of curvature: 87mm.

                 -Mold temperature 60 ℃

                 -PC resin heat fusion temperature / hour 220 ℃ / 2 minutes

                 -Melting PC resin insertion pressure 400Kgf / ㎠

                 -75 tons

In the polarizing optical lens base material thus obtained, the cellulose acetate butyrate-based resin sheet 4 is disposed on the convex surface (object side) around the polarizing sheet 1, and the PC resin sheet 5 on the concave side (eyepiece side) is disposed. The PC resin layer 6 having a polymerization degree of about 90 has a laminated structure having a thickness of 10 mm integrated.

8. Lens Processing

The polarizing optical lens substrate may be processed and used suitably for polarizing optical lenses of various uses. In this embodiment, the concave surface is polished by a known method, a silane-based hard coat layer is formed on both surfaces of the lens, a reflective film is processed by ZrO ₂ / SiO ₂ lamination method, and an antifouling film is formed of a fluorine-based resin to form a polarizing optical lens ( 2) was prepared.

The completed composite polarizing lens had an average transmittance (Tv) of 15% and an average polarization value of 99% or more at a wavelength of 380-720 nm.

The polarizing optical lens base material of the present invention can utilize the features such as mechanical strength and impact strength of the polycarbonate resin as it is, while using light of the prior art generated by using only a polycarbonate protective sheet on both sides of the polarizer sheet. The distortion phenomenon can be prevented, as well as the vulnerability of conventional impact strength or mechanical strength, which is caused by using only the cellulose acetate butyrate-based resin protective sheet on both sides of the polarizer sheet, can be improved.

Accordingly, the polarizing optical lens for eyeglasses manufactured and manufactured using the polarizing optical lens base as a raw material has high impact strength without light distortion, and is light, which reduces eye fatigue and can be safely and conveniently worn. It works.

1 is a cross-sectional view of a lens-shaped composite polarizing plate according to the present invention.

2 is a cross-sectional view of a polarizing optical lens according to the present invention.

Explanation of symbols on the main parts of the drawings

1: polarizer sheet 2: adhesive layer

3: adhesive layer 4: CAB resin sheet

5: PC resin sheet 6: PC resin layer

7: antireflection hard coating layer 8: surface treatment layer

9: hard coating layer 11, 12: protective film

Claims (5)

delete Polyvinyl alcohol (PVA) -based polarizer (pol.) Sheet (1) mainly made of different laminates on both sides thereof, among the laminates of both sides, the convex surface side (object side) Is a cellulose acetate butyrate (CAB) resin sheet, and the laminate on the concave side (eyepiece side) is a polycarbonate (PC) resin layer in a polarizing optical lens base material. , The polycarbonate (PC) resin layer is a polycarbonate (PC) resin sheet (5) laminated on the polarizer sheet (1) by the adhesive (3), and then the polycarbonate A polarizing optical lens base material formed by heat-sealing and integrating a polycarbonate (PC) resin 6 having a polymerization degree of 80 to 100 on the (PC) resin sheet 5. 3. The adhesive layer (2) and cellulose acetate butyrate according to claim 2, wherein the convex surface side (object side) is centered on a polyvinyl alcohol (PVA) -based polarizer (pol.) Sheet (1). (cellulose acetate butyrate; CAB) resin sheet layer 4, and the concave side (eyepiece side) is composed of an adhesive layer 3, polycarbonate (PC) resin layer (5) (6) Polarizing optical lens base material characterized in that. In the method of manufacturing a polarizing optical lens substrate by laminating a protective sheet on both sides of a polarizer (pol.) Sheet, Cellulose acetate butyrate resin sheet on the convex side (object side) of the polarizer sheet, polycarbonate resin sheet on the concave side (eyepiece side) of the polarizer sheet with an adhesive After laminating and adhering the protective film on the protective sheet on both sides, punching it into a disk shape, curving into a lens shape, removing the protective film on both sides, and removing the protective film on the concave surface (eyepiece side). A method of manufacturing a polarizing optical lens base material, characterized in that a polycarbonate resin layer is formed by heat-sealing and integrating a polycarbonate resin having a polymerization degree of 80 to 100 on a polycarbonate resin sheet. The adhesive applied to the convex surface side (object side) is a polyvinyl alcohol solution having a polymerization degree of 2500, and the adhesive applied to the concave surface side (eyepiece side) is a polyurethane adhesive. The manufacturing method of the polarizing optical lens base material which is used.