Polymeric optical conductors

US6766091B2 · kind B2 · utility

Assignee

• Degussa AG · DE

Inventors

• Reinhard Beuth · Marl, DE
• Michael Schlobohm · Haltern, DE
• Uwe Kannengiesser · Duisburg, DE
• Franz-Erich Baumann · Schneverdingen, DE
• Herald Haeger · Recklinghausen, DE

Key dates

• Filing date: Jun 26, 2003
• Grant date: Jul 20, 2004
• Expiry date: Jun 26, 2023

Classification

• Technology area (CPC G): Physics
• CPC primary: G02B6/4436
• WIPO field: Optics
• WIPO sector: Instruments

Abstract

An optical cable, which is flame-retardant, and has excellent adhesion of the protective covering to the fiber cladding and uniform thickness of the fiber cladding, contains a polymer optical conductor containing a fiber core; a single-layer or multi-layer fiber cladding; an inner external layer which adheres to the fiber cladding with a peel force of at least 50 N; and an outer external layer which adheres to the inner external layer with a peel force of not more than 30 N. The inner external layer contains a molding composition having a first polyamide selected from a) PA 11, b) PA 12, c) PA 1012, d) PA 1212, e) a copolyamide of at least two of PA 11, PA 12, PA 1012 and PA 1212, said copolyamide containing not more than 30 mol % of a comonomer, and f) mixtures thereof. The first polyamide contains at least 50 &mgr;eq/g of amino end groups. The first molding composition has a zero-shear viscosity of from 400 to 6000 Pas. The outer external layer contains a second molding composition which has the following i)-iii): i) from 20 to 95% by weight of a second polyamide selected from a) PA 11, b) PA 12, c) PA 1012, d) PA 1212, e) a copolyamide of at least two of PA 11, PA 12, PA 1012 an…