Injection-Molded Product

Abstract

An injection-molded product or an eyewear is provided. The injection-molded product or the eyewear may be an optically compensated injection-molded product, which may resolve optical defects such as a rainbow phenomenon occurring in the injection-molded product or the eyewear. The injection-molded product may include an injection-molded body and a retardation film disposed on at least one side of the injection-molded body. The retardation film has an in-plane phase difference of 1,000 nm or more for light having a wavelength of 550 nm, and wherein an angle formed by a slow axis of the retardation film and an injection direction of the injection-molded body is in a range from 0 degree to 80 degrees.

Claims

1. An injection-molded product, comprising: an injection-molded body; and a retardation film disposed on at least one side of the injection-molded body, wherein the retardation film has an in-plane phase difference of 1,000 nm or more for light having a wavelength of 550 nm, and wherein an angle formed by a slow axis of the retardation film and an injection direction of the injection-molded body is in a range from 0 degrees to 80 degrees.

2. The injection-molded product according to claim 1, wherein the injection-molded body has a phase difference in a range of 800 nm to 3,000 nm for light having a wavelength of 550 nm.

3. The injection-molded product according to according to claim 1, wherein the injection-molded body is a molded body comprising one or more plastics selected from the group consisting of polyvinyl chloride, polyolefin, polyester, nylon, polyamide, polysulfone, polyetherimide, polyethersulfone, polyphenylene sulfide, polyether ketone, polyether ether ketone, ABS resins, polystyrene, polybutadiene, polyacrylate, polyacrylonitrile, polyacetal, polycarbonate, polyphenylene ether, EVA resins, polyvinyl acetate, liquid crystal polymers, ethylene-tetrafluoroethylene copolymers, polyvinyl fluoride, polyvinylidene fluoride, polyvinylidene chloride and teflon.

4. The injection-molded product according to claim 1, wherein the in-plane phase difference of the retardation film is 2,000 nm or more for light having a wavelength of 550 nm.

5. The injection-molded product according to claim 1, wherein the in-plane phase difference of the retardation film is 3,000 nm or more for light having a wavelength of 550 nm is 3,000 nm or more.

6. The injection-molded product according to claim 1, wherein the retardation film is a polymer film or a liquid crystal film.

7. The injection-molded product according to claim 1, wherein the injection-molded body is an eyewear.

8. An Eyewear, comprising: an eyewear body comprising a left eye region and a right eye region; and a retardation film disposed on at least one side of the eyewear body, wherein the eyewear body is an injection-molded body, wherein the retardation film has an in-plane phase difference of 1,000 nm or more for light having a wavelength of 550 nm, and wherein an angle formed by a virtual line connecting respective mass centers of the left eye region and the right eye region in the eyewear body and a slow axis of the retardation film is from 10 degrees to 170 degrees.

9. The eyewear according to claim 8, wherein the eyewear body has a phase difference in a range of 800 nm to 3,000 nm for light having a wavelength of 550 nm.

10. The eyewear according to claim 8, wherein the eyewear body is a molded body comprising one or more plastics selected from the group consisting of polycarbonate and nylon.

11. The eyewear according to claim 8, wherein the in-plane phase difference of the retardation film is 2,000 nm or more for light having a wavelength of 550 nm.

12. The eyewear according to claim 8, wherein the in-plane phase difference of the retardation film is 3,000 nm or more for light having a wavelength of 550 nm.

13. The eyewear according to claim 8, wherein the retardation film is a polymer film or a liquid crystal film.

Description

DESCRIPTION OF DRAWINGS

[0052] FIG. 1 is a diagram showing the structure of an exemplary injection molding machine.

[0053] FIG. 2 is a photograph showing a rainbow phenomenon of an injection-molded product that is not optically compensated.

[0054] FIG. 3 is a photograph of an extrusion-molded product.

[0055] FIGS. 4 to 7 are photographs confirming optical characteristics of the injection-molded products in Examples.

[0056] FIGS. 8 to 12 are photographs confirming optical characteristics of the injection-molded products in Comparative Examples.

MODE FOR INVENTION

[0057] Hereinafter, the present application will be described in detail through examples, but the scope of the present application is not limited by the following examples.

[0058] 1. Phase Difference Evaluation

[0059] In-plane phase differences (Rin) of a retardation film and an injection-molded body were measured for light with a wavelength of 550 nm according to the following method using Agilent's UV/VIS spectroscope 8453 equipment. After installing two polarizers on the UV/VIS spectroscope so that their transmission axes were orthogonal to each other and installing a retardation film so that the slow axis of the retardation film between the two polarizers was set to be 45 degrees with each transmission axis of the two polarizers, transmittance according to wavelengths was measured. In the case of the injection-molded body, the direction of the slow axis was not constant, whereby it was installed such that the injection direction was set to be 45 degrees with each transmission axis of the two polarizers. The phase retardation orders of the respective peaks are obtained from the transmittance graph according to the wavelength. Specifically, the waveform in the transmittance graph according to the wavelength satisfies Equation A below, and the maximum peak (Tmax) condition in the sine wave satisfies Equation B below. In the case of λmax in Equation A, T in Equation A and T in Equation B are the same, so that the equations are developed. If the equations are developed for n+1, n+2 and n+3, and n is arranged into λn and λn+1 equations by arranging the n and n+1 equations to eliminate R, Equation C below is derived. Since n and λ can be known based on the fact that T in Equation A and T in Equation B are the same, R is obtained for each of λn, λn+1, λn+2 and λn+3. For 4 points, the straight trend line of the R values according to the wavelength is obtained, and the R value for the equation 550 nm is calculated. The function of the straight trend line is Y=ax+b, where a and b are constants. The Y value when 550 nm is substituted into x of the above function is the Rin value for light with a wavelength of 550 nm.

T=sin.sup.2[(2πR/λ)]  [Equation A]

T=sin.sup.2[((2n+1)π/2)]  [Equation B]

n=(λn−3λn+1)/(2λn+1+1−2λn)   [Equation C]

[0060] Here, R means an in-plane phase difference (Rin), λ means a wavelength, and n means a vertex degree of a sine waveform.

EXAMPLE 1

[0061] A polycarbonate (PC) plate (injection-molded body) produced by injection-molding PC and having a rectangular shape as shown in FIG. 12 was applied as one applied to formation of an eyewear body. As shown in FIG. 12, the injection-molded body exhibits a severe rainbow phenomenon under a polarized light source. Meanwhile, the injection direction of the injection-molded body is approximately perpendicular to the horizontal direction (arrow direction) described in the drawing. The optical compensation was performed using a PET (poly(ethylene terephthalate)) film (125 μm PET product from SKC) having an in-plane phase difference of approximately 4400 nm or so for a wavelength of 550 nm as a retardation film. At this time, the angle of the slow axis was set to be within a range of approximately 23 degrees to 28 degrees when measured in the counterclockwise direction based on the injection direction (direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 4 is a photograph showing the result, and optical defects such as a rainbow phenomenon were not observed in the region where the retardation film was present as in the photo.

EXAMPLE 2

[0062] The optical compensation was performed in the same manner as in Example 1, except that the slow axis angle of the retardation film was set to be within a range of approximately 67 degrees to 74 degrees when measured in the clockwise direction based on the injection direction (direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 5 is a photograph showing the result, and optical defects such as a rainbow phenomenon were not observed in the region where the retardation film was present as in the photo.

EXAMPLE 3

[0063] The optical compensation of the same injection-molded body as that of Example 1 was performed using a PET (poly(ethylene terephthalate)) film having an in-plane phase difference of approximately 9800 nm for a wavelength of 550 nm (a film of the grade showing the in-plane phase difference among SRF products from Toyobo) as the retardation film. At this time, the slow axis angle was set to be within a range of approximately 38 degrees to 48 degrees when measured in the clockwise direction based on the injection direction (direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 6 is a photograph showing the result, and optical defects such as a rainbow phenomenon were not observed in the region where the retardation film was present as in the photo.

EXAMPLE 4

[0064] The optical compensation was performed in the same manner as in Example 3, except that the slow axis angle of the retardation film was set to be within a range of approximately 45 degrees to 52 degrees when measured in the counterclockwise direction based on the injection direction of the injection-molded body (direction perpendicular to the arrow direction in FIG. 12). FIG. 7 is a photograph showing the result, and optical defects such as a rainbow phenomenon were not observed in the region where the retardation film was present as in the photo.

COMPARATIVE EXAMPLE 1

[0065] The optical compensation was performed in the same manner as in Example 1, except that the slow axis angle of the retardation film was set to be approximately 90 degrees based on the injection direction (the direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 8 is a photograph showing the result, and a rainbow phenomenon was observed even in the region where the retardation film was present as in the photo, thereby confirming optical defects.

COMPARATIVE EXAMPLE 2

[0066] The optical compensation was performed in the same manner as in Example 1, except that the slow axis angle of the retardation film was set to be within a range of approximately 85 degrees when measured in the counterclockwise direction based on the injection direction (direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 9 is a photograph showing the result, and a rainbow phenomenon was observed even in the region where the retardation film was present as in the photo, thereby confirming optical defects.

COMPARATIVE EXAMPLE 3

[0067] The optical compensation was performed in the same manner as in Example 3, except that the slow axis angle of the retardation film was set to be approximately 90 degrees based on the injection direction (direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 10 is a photograph showing the result, and a rainbow phenomenon was observed even in the region where the retardation film was present as in the photo, thereby confirming optical defects.

COMPARATIVE EXAMPLE 4

[0068] The optical compensation was performed in the same manner as in Example 3, except that the slow axis angle of the retardation film was set to be within a range of approximately 85 degrees when measured in the counterclockwise direction based on the injection direction (direction perpendicular to the arrow direction in FIG. 12) of the injection-molded body. FIG. 11 is a photograph showing the result, and a rainbow phenomenon was observed even in the region where the retardation film was present as in the photo, thereby confirming optical defects.