# US 11,029,541 B2 · Optical article with blue cut, high UV cut and high clarity

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- Number: US 11,029,541 B2
- Document ID: US11029541B2
- Status: Granted
- Kind: B2
- Application number: 16/335,199
- Filed: 2017-09-20
- Published: 2019-11-14
- Granted: 2021-06-08
- Earliest claimed: 2016-09-20
- Assignees: Essilor International
- Applicants: Essilor International
- Inventors: Hao Wen Chiu; Aref Jallouli; Haifeng Shan
- Web page: https://patentgrep.com/patent/US11029541B2

## CPC

- G02C 7/104: {having spectral characteristics for purposes other than sun-protection}
- B29D 11/00634: {Production of filters}
- C09B 47/00: Porphines; Azaporphines {(non-dyeing compounds C07D487/22)}
- G02C 7/108: {Colouring materials}
- B29K 2069/00: Use of PC, i.e. polycarbonates {or derivatives thereof}, as moulding material
- B29K 2105/0032: {Pigments, colouring agents or opacifiyng agents}
- G02C 2202/10: Optical elements and systems for visual disorders other than refractive errors, low vision
- 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)
- B29D: PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE (making granules B29B9/00; making preforms B29B11/00)
- C09B: ORGANIC DYES OR CLOSELY-RELATED COMPOUNDS FOR PRODUCING DYES {, e.g. PIGMENTS}; MORDANTS; LAKES (fermentation or enzyme using processes to synthesise a desired chemical compound C12P)
- 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

## Abstract

The combination of selective and high pass filters to cut harmful blue light allowed to achieve the best compromise between high blue cut performance, high UV cut and low yellow index, not achievable when using the filters alone.

## Claims

### Claim 1

A transparent optical article with enhanced ultraviolet and blue light blocking ability comprising:
a selective filter at least partially blocking blue light in a wavelength range chosen within the 400-460 nm range; and
a high-pass filter having its maximum cut in the UV light wavelength range and partially blocking blue light in the 400-500 nm range;
wherein the optical article blocks at least 66% of light with a wavelength less than or equal to about 410 nm, at each wavelength in the wavelength range 350-410 nm;
wherein the selective filter is an absorbing dye that has an absorption peak centered at a wavelength chosen within the 410-440 nm wavelength range and exhibits a full width at half maximum lower than or equal to 40 nm.

### Claim 2 (depends on 1)

The transparent optical article of claim 1, wherein the absorbing dye is a porphine, a porphyrin, a porphyrin complex or derivative.

### Claim 3 (depends on 1)

The transparent optical article of claim 1, wherein the optical article comprises a polymer substrate comprising said absorbing dye dispersed or dissolved within said polymer substrate, at a concentration ranging from 1 to 10 ppm.

### Claim 4 (depends on 1)

The transparent optical article of claim 1, wherein the high pass filter is a UV absorber.

### Claim 5 (depends on 4)

The transparent optical article of claim 4, wherein the UV absorber is a benzotriazole compound.

### Claim 6 (depends on 5)

The transparent optical article of claim 5, wherein the benzotriazole compound is 2-(5-chloro-2H-benzotriazole-2-yl)-6-(1, 1-dimethylethyl)-4-methyl phenol.

### Claim 7 (depends on 4)

The transparent optical article of claim 4, wherein the optical article comprises a polymer substrate and, dispersed or dissolved therein, said UV absorber at a concentration ranging from 0.1 to 2.0 weight %.

### Claim 8 (depends on 1)

The transparent optical article of claim 1, wherein the optical article has a BVC(B′) value of ≥15%.

### Claim 9 (depends on 1)

The transparent optical article of claim 1, wherein the optical article has a colorimetric coefficient b* as defined in the CIE (1976) L*a*b* international colorimetric system that is less than or equal to 5.

### Claim 10 (depends on 1)

The transparent optical article of claim 1, wherein the selective filter and high-pass filter reduce the through transmittance of light with a wavelength less than or equal to about 410 nm in a synergistic fashion.

### Claim 11

A wafer for reducing through-transmittance of light with a wavelength less than or equal to about 410 nm to a substrate, comprising:
a blend of a transparent polymer resin;
a selective filter at least partially blocking blue light in a wavelength range chosen within the 400-460 nm range; and
a high-pass filter having its maximum cut in the UV light wavelength range and partially blocking blue light in the 400-500 nm range;
wherein the selective filter is an absorbing dye that has an absorption peak centered at a wavelength chosen within the 410-440 nm wavelength range and exhibits a full width at half maximum lower than or equal to 40 nm.

### Claim 12 (depends on 11)

The wafer of claim 11, wherein the wafer reduces through-transmittance of light with a wavelength less than or equal to about 408 nm to a substrate.

### Claim 13 (depends on 1)

A process for protecting at least part of an eye of a user from phototoxic blue light, comprising the user obtaining and using an optical article of claim 1.

### Claim 14

A process of enhancing the blue-cut performance of an optical element resin comprising:
blending a transparent polymer resin with a selective filter at least partially blocking blue light in a wavelength range chosen within the 400-460 nm range and a high-pass filter having its maximum cut in the UV light wavelength range; and
partially blocking blue light in the 400-500 nm range by a process selected from the group consisting of dry blending, melt mixing, and solvent mixing;
wherein the selective filter is an absorbing dye that has an absorption peak centered at a wavelength chosen within the 410-440 nm wavelength range and exhibits a full width at half maximum lower than or equal to 40 nm.

### Claim 15 (depends on 1)

The transparent optical article of claim 1, wherein the absorbing dye exhibits a full width at half maximum lower than or equal to 30 nm.

### Claim 16 (depends on 1)

The transparent optical article of claim 1, wherein the absorbing dye exhibits a full width at half maximum lower than 25 nm.

### Claim 17 (depends on 1)

The transparent optical article of claim 1, wherein the absorbing dye exhibits a full width at half maximum lower than 20 nm.

### Claim 18 (depends on 1)

The transparent optical article of claim 1, wherein the absorbing dye exhibits a full width at half maximum higher than or equal to 5 nm.

### Claim 19 (depends on 1)

The transparent optical article of claim 1, wherein the absorbing dye exhibits a full width at half maximum higher than or equal to 10 nm.