# US 2014/0151911 A1 · Polarizing lens made of aromatic polycarbonate

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- Number: US 2014/0151911 A1
- Document ID: US20140151911A1
- Status: Published application
- Kind: A1
- Application number: 14/177,390
- Filed: 2014-02-11
- Published: 2014-06-05
- Earliest claimed: 2010-02-24
- Assignees: Mgc Filsheet Co., Ltd.; Mitsubishi Gas Chemical Company, Inc.
- Inventors: Terutaka TOKUMARU; Katsunori Suzuki; Ken Shimomai; Masaki Yagoura; Kyousuke Nakamura; Akio Ohkubo
- Web page: https://patentgrep.com/patent/US20140151911A1

## CPC

- B29D 11/00644: {polarizing}
- B29C 45/14811: {Multilayered articles (B29C45/14827 takes precedence)}
- B29C 61/00: Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor (for surface shaping B29C59/18; for lining articles B29C63/38; for joining preformed parts B29C65/66 {; for packaging B65B53/00; connecting arrangements or other fittings for plastics pipes using shrink-down material F16L47/22, electrical connections insulated using heat shrinking insulating sleeves H01R4/72; cable junctions protected by sleeves H02G15/18})
- G02B 5/3033: {in the form of a thin sheet or foil, e.g. Polaroid}
- G02C 7/12: Polarisers
- B29C 45/7207: {of the moulded articles}
- B29C 2045/14237: {the inserts being deformed or preformed outside the mould or mould cavity}
- B29D 11/0073: {Optical laminates}
- B29K 2069/00: Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material
- B29K 2669/00: Use of {PC, i.e.} polycarbonates {or derivatives thereof} for preformed parts, e.g. for inserts
- B29K 2715/006: Glues or adhesives, e.g. hot melts or thermofusible adhesives
- B29K 2995/0034: Polarising
- B29L 2011/00: Optical elements, e.g. lenses, prisms
- B29L 2011/0016: {Lenses}
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02C: SPECTACLES; SUNGLASSES OR GOGGLES INSOFAR AS THEY HAVE THE SAME FEATURES AS SPECTACLES; CONTACT LENSES (trial frames for testing the eyes A61B3/04; goggles or eyeshields not having the same features as spectacles A61F9/00)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES

## Abstract

The present invention relates to a polarizing lens molded by inserting a polarizing sheet bent into a sphere or an asphere after having an aromatic polycarbonate sheet bonded via an adhesive layer to both surfaces of a film with polarized nature into a mold, and injecting aromatic polycarbonate, wherein heat treatment at a temperature not less than a temperature of 50° C. lower than the glass transition point and less than the glass transition point for an appropriate time has been performed after injecting aromatic polycarbonate to approximate a designed value of the lens curvature.

## Claims

### Claim at position 1

1-3. (canceled)

### Claim 4

A method for producing a polarizing lens, the method comprising:
(a) bending a polarizing sheet onto a spherical or aspherical surface, wherein the polarizing sheet comprises (i) a polarizing film and (ii) two aromatic polycarbonate sheets comprising a first aromatic polycarbonate, wherein a first of the two aromatic polycarbonate sheets is bonded via an adhesive layer to a first surface of the polarizing film, and a second of the two aromatic polycarbonate sheets is bonded via an adhesive layer to a second surface of the polarizing film;
(b) injecting a second aromatic polycarbonate onto one surface of the bent polarizing sheet; and then (c) heat treating the bent polarizing sheet at a temperature in a range from 15° C. less than to 40° C. less than a glass transition temperature of the first aromatic polycarbonate;
to obtain a polarizing lens,
wherein:
a retardation value of the aromatic polycarbonate sheet disposed on an opposite surface to the surface where the second aromatic polycarbonate was injected is in a range from 2000 nm to 20000 nm.

### Claim 5 (depends on 4)

The method of claim 4, wherein when a heat treatment temperature, in ° C., is X and a heat treatment time, in hours, is Y, and X is in a range from 115° C. to 135° C., a relationship between the heat treatment temperature and heat treatment time satisfies Formula 1,
15.6≦Log(Y)+0.122X≦16.9 (1)
and an anisotropy of base curves in the horizontal direction and in the vertical direction of the polarizing lens after the heat treating is not more than 0.25.

### Claim 6 (depends on 5)

The method of claim 5, wherein the relationship between X and Y satisfies Formula 2,
16.1≦Log(Y)+0.122X≦16.8 (2)
and the anisotropy of the base curves in the horizontal direction and in the vertical direction of the polarizing lens after the heat treating is not more than 0.1.

### Claim 7 (depends on 4)

The method of claim 4, wherein the first and second aromatic polycarbonates are the same kind of aromatic polycarbonate.

### Claim 8 (depends on 4)

The method of claim 4, wherein a viscosity-average molecular weight of the first and/or second aromatic polycarbonates is from 12,000 to 40,000.

### Claim 9 (depends on 4)

The method of claim 4, wherein a viscosity-average molecular weight of the first and/or second aromatic polycarbonates is from 20,000 to 35,000.

### Claim 10 (depends on 4)

The method of claim 4, wherein a thickness of each of the two aromatic polycarbonate sheets is from 50 μm to 1.5 mm.

### Claim 11 (depends on 4)

The method of claim 4, wherein a thickness of each of the two aromatic polycarbonate sheets is from 100 μm to 800 μm.