# US 12,215,248 B2 · Resin composition, optical fiber, and method for producing optical fiber using polyol between 8000 and 20000 average molecular weight

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- Number: US 12,215,248 B2
- Document ID: US12215248B2
- Status: Granted
- Kind: B2
- Application number: 18/010,042
- Filed: 2021-05-06
- Published: 2023-06-22
- Granted: 2025-02-04
- Earliest claimed: 2020-06-24
- Assignees: Sumitomo Electric Industries, Ltd.
- Applicants: Sumitomo Electric Industries, Ltd.
- Inventors: Yuya Homma
- Web page: https://patentgrep.com/patent/US12215248B2

## CPC

- C08G 18/7621: {being toluene diisocyanate including isomer mixtures}
- C09D 175/08: from polyethers
- C03C 25/1065: Multiple coatings
- C03C 25/285: Acrylic resins
- C03C 25/326: Polyureas; Polyurethanes
- C03C 25/6226: Ultraviolet
- C08F 283/008: {on to unsaturated polymers}
- C08F 290/067: {Polyurethanes; Polyureas}
- C08G 18/246: {containing also tin-carbon bonds}
- C08G 18/282: {Alkanols, cycloalkanols or arylalkanols including terpenealcohols}
- C08G 18/4845: {containing oxypropylene or higher oxyalkylene end groups}
- C08G 18/6715: {Unsaturated monofunctional alcohols or amines}
- C08G 18/8064: {with monohydroxy compounds}
- C08L 75/04: Polyurethanes
- C08L 75/16: having terminal carbon-to-carbon unsaturated bonds
- C09D 175/04: Polyurethanes
- C09D 175/16: having terminal carbon-to-carbon unsaturated bonds
- G02B 6/02395: {Glass optical fibre with a protective coating, e.g. two layer polymer coating deposited directly on a silica cladding surface during fibre manufacture (G02B6/02052, G02B6/02057, G02B6/024, G02B6/032, G02B6/105, G02B6/14 take precedence; coating on fibre gratings G02B6/02104; multilayer core or cladding G02B6/036; reinforcing splice joints G02B6/2558; optical cables, i.e. comprising protective structures external to the protective coating such as a jacket or plural coated optical fibres G02B6/44; coating of glass to obtain optical fibres C03C25/104)}
- G02B 6/4402: {with one single optical waveguide (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- C08G 18/10: Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- C03C: CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C08F: MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

A resin composition for the secondary coating of an optical fiber is a resin composition containing a non-reactive urethane compound having a number average molecular weight of 10000 or more and 50000 or less, a photopolymerizable compound, and a photopolymerization initiator, the content of the non-reactive urethane compound is 0.05 parts by mass or more and 5 parts by mass or less based on the total amount of the resin composition, and the non-reactive urethane compound is a reaction product of a polyol having a number average molecular weight of 8000 or more and 20000 or less, a diisocyanate, and a compound having active hydrogen.

## Claims

### Claim 1

A resin composition for secondary coating of an optical fiber, the resin composition comprising:
a non-reactive urethane compound having a number average molecular weight of 10000 or more and 50000 or less;
a photopolymerizable compound; and
a photopolymerization initiator,
wherein a content of the non-reactive urethane compound is 0.05 parts by mass or more and 5 parts by mass or less based on a total amount of the resin composition, and
the non-reactive urethane compound is a reaction product of a polyol having a number average molecular weight of 8000 or more and 20000 or less, a diisocyanate, and a compound having active hydrogen.

### Claim 2 (depends on 1)

The resin composition according to claim 1, wherein the polyol is a polypropylene polyol.

### Claim 3 (depends on 1)

The resin composition according to claim 1, wherein the compound having active hydrogen is a monohydric alcohol.

### Claim 4 (depends on 1)

The resin composition according to claim 1, wherein
the photopolymerizable compound contains 5 parts by mass or more and 40 parts by mass or less of a urethane (meth)acrylate having a number average molecular weight of 500 or more and 6000 or less based on a total amount of the resin composition, and
the urethane (meth)acrylate is a reaction product of a polyol having a number average molecular weight of 300 or more and 2500 or less, a diisocyanate, and a hydroxyl group-containing (meth)acrylate.

### Claim 5 (depends on 1)

The resin composition according to claim 1, wherein the photopolymerizable compound contains 30 parts by mass or more and 70 parts by mass or less of a bisphenol skeleton-containing (meth)acrylate based on a total amount of the resin composition.

### Claim 6 (depends on 1)

An optical fiber comprising:
a glass fiber comprising a core and a cladding;
a primary resin layer coating the glass fiber in contact with the glass fiber; and
a secondary resin layer coating the primary resin layer,
wherein the secondary resin layer comprises a cured product of the resin composition according to claim 1.

### Claim 7 (depends on 1)

A method for producing an optical fiber, the method comprising:
an application step of applying the resin composition according to claim 1 to a periphery of a glass fiber comprising a core and a cladding; and
a curing step of curing the resin composition by irradiation with ultraviolet rays after the application step.