# US 10,502,913 B2 · Polymeric compositions for optical fiber cable components

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- Number: US 10,502,913 B2
- Document ID: US10502913B2
- Status: Granted
- Kind: B2
- Application number: 16/069,388
- Filed: 2016-03-07
- Published: 2019-01-24
- Granted: 2019-12-10
- Earliest claimed: 2016-03-07
- Assignees: Dow Global Technologies LLC
- Applicants: Dow Global Technologies LLC
- Inventors: William J. Harris; Mohamed Esseghir; Gangwei Sun
- Web page: https://patentgrep.com/patent/US10502913B2

## CPC

- G02B 6/441: {built up from sub-bundles (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- C08L 2205/03: containing three or more polymers in a blend
- G02B 6/4407: {with internal fluted support member (G02B6/4429, G02B6/4439, G02B6/4479 take precedence)}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- C08L: COMPOSITIONS OF MACROMOLECULAR COMPOUNDS (compositions based on polymerisable monomers C08F, C08G; artificial filaments or fibres D01F; textile treating compositions D06)

## Abstract

Polymeric compositions comprising a polybutylene terephthalate, an ethylene-based polymer, and a maleated ethylene-based polymer. Optical cable components fabricated from the polymeric composition. Optionally, the polymeric composition can further comprise one or more additives, such as a filler. The optical fiber cable components can be selected from buffer tubes, core tubes, and slotted core tubes, among others.

## Claims

### Claim 1

A polymeric composition, comprising:
60 weight percent to 70 weight percent of a polybutylene terephthalate;
25 weight percent to 40 weight percent of an ethylene-based polymer having a density of at least 0.945 g/cm3; and
0.5 weight percent to 5 weight percent of a maleated ethylene-based polymer having a density of at least 0.93 g/cm3,
wherein the polymeric composition exhibits:
a grease-aged Young's modulus in the range of from 1,000 to 2,400 MPa;
a notched Izod impact strength at −20° C. of at least 40 J/m; and
a weight increase of less than 2 weight percent when immersed in LT410A optical grease at a depth of 40 mils and maintained at an air temperature of 80° C. for a period of 16 days.

### Claim 2 (depends on 1)

The polymeric composition of claim 1, wherein said polymeric composition further comprises one or more fillers in an amount ranging from 2 to 30 weight percent, based on the entire weight of the polymeric composition.

### Claim 3 (depends on 1)

An extruded optical cable protective component comprising the polymeric composition of claim 1.

### Claim 4 (depends on 3)

An optical fiber cable, comprising:
(a) the extruded optical fiber cable protective component of claim 3; and
(b) at least one optical fiber transmission medium.