Fire retardant strength member for optical fiber cables and manufacturing method thereof
US12339510B2 · kind B2 · utility
Inventor
Key dates
| Filing date | Mar 17, 2022 |
| Grant date | Jun 24, 2025 |
| Priority date | — |
| Expiry date | Jan 11, 2044 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4432
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A strength member (202, 302) for use in an optical fiber cable and manufacturing method thereof are provided. The strength member comprises a polymer matrix reinforced with one or more yarns, wherein the polymer matrix is a blend of a resin and an inorganic filler. The resin is a polyurethane resin and the inorganic filler is one or more of Magnesium Hydroxide, Aluminium Trihydrate, Zinc borate, Antimony Trioxide, Ammonium Polyphosphate, molybdate based filler and clay nanocomposite. The manufacturing method includes coating the one or more strength yarns with the polymer matrix and curing of the polymer matrix. The inorganic filler is blended in third wet bath of the resin followed by two wet baths of the resin only and the resin is cured after each wet bath. The strength member produces a smoke density of less than 170 at heat flux 50 kW/m2 for 20 minutes.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.