# US 7,609,930 B2 · Plastic optical fiber cable

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- Number: US 7,609,930 B2
- Document ID: US7609930B2
- Status: Granted
- Kind: B2
- Application number: 11/919,983
- Filed: 2006-05-09
- Published: 2009-03-12
- Granted: 2009-10-27
- Earliest claimed: 2005-05-09
- Assignees: Mitsubishi Rayon Co., Ltd.
- Inventors: Amane Aoyagi; Yoshihiro Tsukamoto; Yasushi Fujishige
- Web page: https://patentgrep.com/patent/US7609930B2

## CPC

- G02B 6/02033: {Core or cladding made from organic material, e.g. polymeric material (G02B1/04 takes precedence)}
- G02B 1/048: {characterised by the cladding material}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS

## Abstract

The invention provides a plastic optical fiber cable comprising a plastic optical fiber having a core/clad structure, a light blocking coating layer provided around the plastic optical fiber, and a protective coating layer provided between the outermost layer of the core/clad structure and the light blocking coating layer. The outermost layer of the core/clad structure is made of a fluorine-containing olefin polymer containing at least a tetrafluoroethylene unit, the crystal melting heat of the fluorine-containing olefin polymer being 59 mJ/mg or lower. The light blocking coating layer is made of a resin primarily containing a polyamide resin, the content of polyamide resin-derived monomers and oligomers being 1.5% by weight or lower.

## Claims

### Claim 1

A plastic optical fiber cable comprising:
A plastic optical fiber having a core-clad structure: and
A light blocking coating layer provided around the plastic optical fiber,
wherein the outermost layer of the core/clad structure is made of a fluorine-containing olefin polymer containing at least a tetrafluoroethylene unit, the crystal melting heat of the fluorine-containing olefin polymer being 59 mJ/mg or lower;
the light blocking coating layer is made of a resin primarily containing a polyamide resin, the total content of polyamide resin-derived monomer compounds and oligomer compounds being 1.5% by weight or lower; and
the plastic optical fiber cable further comprises a protective coating layer provided between the outermost layer of the core/clad structure and the light blocking coating layer.

### Claim 2 (depends on 1)

The plastic optical fiber cable according to claim 1, wherein the resin that forms the light blocking coating layer contains a terminal amino group, the content of which is 100 μeq/g or lower.

### Claim 3 (depends on 1)

The plastic optical fiber cable according to claim 1, wherein the miscibility parameter (SP value) of the protective coating layer, SP1, and the miscibility parameter (SP value) of the monomers and oligomers contained in the polyamide resin that is the primary component of the light blocking coating layer, SP2, satisfy the following equation:
|SP1−SP2|≧0.2.

### Claim 4 (depends on 1)

The plastic optical fiber cable according to claim 1, wherein the protective coating layer is made of any of a resin containing a methyl (meth)acrylate unit, a resin primarily formed of a styrene unit, a polycarbonate resin, a resin primarily formed of a propylene unit, a resin primarily containing a ethylene-vinyl alcohol copolymer, a polybutylene terephthalate resin, and a polyacetal resin.

### Claim 5 (depends on 1)

The plastic optical fiber cable according to claim 1, wherein the protective coating layer is made of a resin containing 85 to 97% by weight of a vinylidene fluoride unit.

### Claim 6 (depends on 1)

The plastic optical fiber cable according to claim 1, wherein the protective coating layer is made of a resin containing a copolymer unit having at least one of an acid anhydride group, a carboxylic acid group, and a glycidyl group.