Colored polarizing films, colored polarizing sheets, and colored polarizing lenses, and methods thereof

Patent metadata

Field	Value
Publication number	US-9897823-B2
Application number	US-201314422730-A
Country	US
Kind code	B2
Filing date	Aug 19, 2013
Priority date	Aug 21, 2012
Publication date	Feb 20, 2018
Grant date	Feb 20, 2018

Abstract

A polarizing film is produced by swelling a polyvinyl alcohol film with water, uniaxially stretching it, dyeing it with an organic dichroic dye, and drying it, wherein a dichroic organic dye composition includes a combination of organic dyes having a dichroic ratio of 13 or higher used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration dye composition comprises a combination of dyes having extremely low dichroic ratios of 4 or less or substantially having no dichroic ratio, laminating at least one layer of a transparent plastic sheet onto at least both sides of the polarizing film, curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto to obtain a polarizing and injecting a transparent resin to the concave surface of the curved polarizing sheet to obtain an injection polarizing lens.

First claim

The invention claimed is:

1. A method for producing a colored polarizing film of a desired color, wherein the method for producing the polarizing film comprises swelling a polyvinyl alcohol film with water, uniaxially stretching it, dyeing it with a dichroic organic dye, and drying it, wherein the dichroic organic dye comprises a dichroic organic dye composition and a coloration organic dye composition, wherein the dichroic organic dye composition comprises a combination of dichroic organic dyes having a dichroic ratio of 13 or higher, used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration organic dye composition comprises a combination of dyes having an extremely low dichroic ratio of 4 or less or substantially having no dichroic ratio, used in an amount yielding a desired dyed color, wherein a target percentage of total light transmission is selected, wherein the dichroic organic dyes of the dichroic organic dye composition are selected such that, when combined, they are substantially colorless, and contribute to obtain a polarizing degree of interest and to provide a percentage of light transmission that exceeds the target percentage of total light transmission,
and wherein the dyes of the coloration organic dye composition are selected so as to have a color of interest and selected to have a dichroic ratio and an amount to maintain the polarizing degree of interest while reducing the percentage of light transmission provided by the dichroic organic dyes of the dichroic organic dye composition such that the colored polarizing film has the target percentage of total light transmission.

2. The method for producing the colored polarizing film of claim 1 , wherein the dichroic organic dye composition and the coloration organic dye composition are used in an aqueous solution.

3. The method for producing the colored polarizing film of claim 1 , wherein the dichroic organic dye composition is used in an amount to obtain the lower limit of the required degree of polarization.

4. The method for producing the colored polarizing film of claim 1 , wherein the coloration organic dye composition is used in an amount such that the transmittance of the film is 10% or more and is at least 5% smaller than the transmittance of a polarizing film obtained by using the dichroic organic dye composition only.

5. A colored polarizing sheet that comprises a polarizing film produced by swelling a polyvinyl alcohol film with water, uniaxially stretching it, dyeing it with a dichroic organic dye, and drying it, and transparent plastic sheets attached on both sides of the polarizing film by an adhesive, wherein the dichroic organic dye used in producing the film comprises a dichroic organic dye composition and a coloration organic dye composition, wherein the dichroic organic dye composition comprises a combination of organic dyes having a dichroic ratio of 13 or higher, used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration organic dye composition comprises a combination of dyes having an extremely low dichroic ratio of 4 or less or substantially having no dichroic ratio, used in an amount yielding a desired dyed color, wherein a target percentage of total light transmission is selected, wherein the dichroic organic dyes of the dichroic organic dye composition are selected such that, when combined, they are substantially colorless, and contribute to obtain a polarizing degree of interest and to provide a percentage of light transmission that exceeds the target percentage of total light transmission,
and wherein the dyes of the coloration organic dye composition are selected so as to have a color of interest and selected to have a dichroic ratio and an amount to maintain the polarizing degree of interest while reducing the percentage of light transmission provided by the dichroic organic dyes of the dichroic organic dye composition such that the colored polarizing film has the target percentage of total light transmission.

6. The colored polarizing sheet of claim 5 , wherein the dichroic organic dye composition and the coloration organic dye composition are used in an aqueous solution.

7. The colored polarizing sheet of claim 5 , wherein the dichroic organic dye composition is used in an amount to obtain the lower limit of the required dichroic ratio.

8. The colored polarizing sheet of claim 5 , wherein the coloration organic dye composition is used in an amount such that the transmittance of the film is 10% or more and is at least 5% smaller than that the transmittance of a polarizing film obtained by using the dichroic organic dyeing composition only.

9. The colored polarizing sheet of claim 5 , wherein the material of at least one of the transparent plastic sheets is one or more selected from the group consisting of: aromatic polycarbonates, polyacrylate, acetylcellulose, polyamide, and a composition of an aromatic polycarbonate and alicyclic polyester.

10. The colored polarizing sheet of claim 5 , wherein at least one of the transparent plastic sheets is an aromatic polycarbonate sheet that has a thickness of from 0.1 mm to 1 mm and the sheet provides a retardation value of 3000 nm or higher.

11. The colored polarizing sheet of claim 5 , wherein in the adhesive layer is a two-liquid type thermosetting polyurethane resin that consists of a curative agent that comprises a polyurethane prepolymer and a hydroxyl (poly) acrylate.

12. A colored polarizing lens obtained by: laminating with a transparent plastic sheet via an adhesive layer to each surface of a polarizing film that is made by swelling a polyvinyl alcohol resin with water, uniaxially stretching it, dyeing it with a dichroic organic dye, and drying it to obtain a polarizing sheet; curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto to obtain a curved polarizing lens or curving the polarizing sheet so as to impart spherical or aspherical surfaces thereto and injecting a transparent resin onto the concave surface to obtain an injection-molded lens, wherein the dichroic organic dye is made by using a dichroic organic dye composition and a coloration organic composition, wherein the dichroic organic dye composition used to produce the polarizing film comprises a combination of dichroic organic dyes having a dichroic ratio of 13 or higher and is used in an amount to keep the degree of polarization at 90% or more, and wherein the coloration organic dye composition comprises a combination of dyes having an extremely low dichroic ratio of 4 or less or substantially having no dichroic ratio, wherein a target percentage of total light transmission is selected, wherein the dichroic organic dyes of the dichroic organic dye composition are selected such that, when combined, they are substantially colorless, and contribute to obtain a polarizing degree of interest and to provide a percentage of light transmission that exceeds the target percentage of total light transmission,
and wherein the dyes of the coloration organic dye composition are selected so as to have a color of interest and selected to have a dichroic ratio and an amount to maintain the polarizing degree of interest while reducing the percentage of light transmission provided by the dichroic organic dyes of the dichroic organic dye composition such that the colored polarizing film has the target percentage of total light transmission,
the resulting polarizing film being a polarizing film of a desired color.

13. The colored polarizing lens of claim 12 , wherein the polarizing film is dyed by using the dichroic organic dye composition and the coloration organic dye composition in an

Assignees

• Mitsubishi Gas Chemical Co
• Mgc Filsheet Co Ltd

Inventors

• Kimura Hideaki
• Akaki Masayuki
• Sasagawa Taisuke
• Takano Toshihiko
• Tokumaru Terutaka

Classifications

• G02C7/022

  Ophthalmic lenses having special refractive features achieved by special materials or material structures (G02C7/049 takes precedence) · CPC title

• B29C65/48

  using adhesives {, i.e. using supplementary joining material; solvent bonding} · CPC title

• B29K2069/00

  Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material · CPC title

• B29C45/1676

  using a soft material and a rigid material, e.g. making articles with a sealing part · CPC title

• G02B1/08

  made of polarising materials · CPC title