# US 5,706,131 A · Polarizing element, polarizing plate, and process for production thereof

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- Number: US 5,706,131 A
- Document ID: US5706131A
- Status: Granted
- Kind: A
- Application number: 08/428,150
- Filed: 1995-04-28
- Granted: 1998-01-06
- Earliest claimed: 1993-09-10
- Assignees: Nippon Kayaku Kabushiki Kaisha
- Inventors: Kunihiro Ichimura; Norio Ishizuki; Junji Toda
- Web page: https://patentgrep.com/patent/US5706131A

## CPC

- G02B 1/14: Protective coatings, e.g. hard coatings
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A polarizing element or polarizing plate comprising a layer having photoactive molecules and a layer containing dichroic molecules formed in contact with said layer, which can easily be produced without a stretching procedure so as to have a complicated pattern, a curved surface or a large area; and a process for producing said polarizing element or polarizing plate which is characterized by irradiating a layer having photoactive molecules on a substrate with linear polarized light, and then forming a dichroic molecular layer on the irradiated layer.

## Claims

### Claim 1

A polarizing element or polarizing plate having a first layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C, non-aromatic C.dbd.N and non-aromatic N.dbd.N and a second layer containing dichroic molecules formed in contact with said first layer.

### Claim 2 (depends on 1)

A polarizing element or polarizing plate according to claim 1, wherein the first layer having photoactive molecules is formed on a substrate, and a protective layer is formed on the second layer containing dichroic molecules.

### Claim 3 (depends on 1, 2)

A polarizing element or a polarizing plate according to claim 1 or 2, wherein said second layer containing the dichroic molecules is in a solid state.

### Claim 4 (depends on 1, 2)

A polarizing element or polarizing plate according to claim 1 or 2, wherein the dichroic molecules are those of a compound having a hydrophilic substituent.

### Claim 5 (depends on 4)

A polarizing element or polarizing plate according to claim 4, wherein the hydrophilic substituent is a sulfonic acid group, an amino group or a hydroxyl group.

### Claim 6 (depends on 2)

A polarizing element or polarizing plate according to claim 2, wherein the substrate is flat or has a curved surface.

### Claim 7

A process for producing a polarizing element or polarizing plate, characterized by irradiating a layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C, non-aromatic C.dbd.N and non-aromatic N.dbd.N on a substrate with linear polarized light, and then forming a layer containing dichroic molecules on the photoactive molecular layer.

### Claim 8 (depends on 7)

A process for producing a polarizing element or polarizing plate according to claim 7, characterized in that the layer having photoactive molecules on the substrate is subjected to corona discharge treatment or ultraviolet irradiation treatment.

### Claim 9

A gradation display polarizing element or polarizing plate having a first layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C, non-aromatic C.dbd.N and non-aromatic N.dbd.N and a second layer containing dichroic molecules formed in contact with said first layer having photoactive molecules.

### Claim 10

A process for producing a gradation display polarizing element or polarizing plate, characterized by irradiating a layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C , non-aromatic C.dbd.N and non-aromatic N.dbd.N on a substrate with linear polarized light through a mask composed of portions different in depth of color, and then forming a layer containing dichroic molecules on the photoactive molecular layer.

### Claim 11

A multi-axial polarizing element or polarizing plate having a layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C, non-aromatic C.dbd.N and non-aromatic N.dbd.N and a layer containing dichroic molecules formed in contact with the former layer.

### Claim 12

A process for producing a multi-axial polarizing element or polarizing plate, characterized by irradiating a layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C, non-aromatic C.dbd.N and non-aromatic N.dbd.N on a substrate with two or more kinds of linear polarized lights having different axes of rotation, and then forming a layer containing dichroic molecules on the photoactive molecular layer.

### Claim 13

A stereoscopic display polarizing element or polarizing plate having a first layer having photoactive molecules containing at least one double bond selected from non-aromatic C.dbd.C, non-aromatic C.dbd.N and non-aromatic N.dbd.N and a second layer containing dichroic molecules formed in contact with said first layer having photoactive molecules.