公开(公告)号：DE4124176A1

公开(公告)日：1993-01-21

申请号：DE4124176

申请日：1991-07-20

Applicant: HOECHST AG

Inventor： HEITZ WALTER PROF DR ,  RISSE WILHELM DR ,  SEEHOF NORBERT ,  DITTMER THOMAS DR ,  FRITSCH KARSTEN DR ,  WIENERS GERHARD DR

IPC: C08G61/08 ,  G02B1/04

Abstract: Optical waveguides (I) with polymer core and sheath are claimed, with refractive index ratio core/sheath = nK/nK - above 1.01; in type (Ia) the core polymer (II) is polycarbonate or a polymer contg. units of styrene, substd. styrene, (meth)acrylate or fluoroacrylate, and the sheath polymer (III) contains 0.1-100 wt.% monomer units of formula (IIIA), (IIIB) and/or (IIIC); alternatively, (Ib) the sheath is a fluoropolymer and the core is polymer (III) as above; or (Ic) both core and sheath consists of a polymer (III). Also claimed is a thermoplastic polymer of formula (IV), with degree of polymerisation = 5-10,000. R1-R4 = H, D, F or 1-10C perfluoroalkyl; R5, R6 = H, D or F (in equatorial or axial position); R7, R8 - H, D, F or 1-10C perfluoroalkyl; 1 = 1-3; m = 1-4; x, y, z = 0-1; x + y + z = 1. Also claimed is a process for the prodn. of (I) by extruding the polymer core and coating it with a polymer sheath. Specifically, in type (Ib), the sheath is a fluoropolymer contg. 10-100 wt.% units of VDF, TFE, HFP, fluorovinyl ether, alkyl (esp. fluoroalkyl) methacrylate or alpha-fluoroacrylate, or fluorodioxole; pref. core and sheath are produced by simultaneous co-extrusion. USE/ADVANTAGE - The invention provides polymeric optical fibres based on new, highly transparent, readily extrudable thermoplastic polymers which can be used for long periods at 100-150 deg.C. without adversely affecting transparency, i.e. with no significant redn. in transmission length or increase in attenuation; polymers (IV) also have good mechanical properties, very good oxidn. stability, high temp. resistance and high weathering resistance.

公开(公告)号：DE4124177A1

公开(公告)日：1993-01-21

申请号：DE4124177

申请日：1991-07-20

Applicant: HOECHST AG

Inventor： HEITZ WALTER PROF DR ,  RISSE WILHELM DR ,  SEEHOF NORBERT ,  DITTMER THOMAS DR ,  FRITSCH KARSTEN DR ,  WIENERS GERHARD DR

IPC: C08G61/08 ,  G02B1/04

Abstract: Light waveguide (I) has core/coating structure, with core comprising a polymer with a refractive index n(K) and coating of polymer with a refractive index n(M), whereby n(K)/n(M) is greater than 1.01. The core consists of a polycarbonate or a polymer contg. derivs. of (substd.) styrene, (meth)acrylate or a fluoroacrylate, and the coating consists of a polymer contg. 0.1-100 wt.% at least one of the monomers of formulae (II), (III) and (IV): (where R1 and R2 = identical or different H, D or methyl; R3, R4, R5 and R6 = identical or different H, D, F or (un)branced 1-10C perfluoroalkly; R7 and R8 = identical or different H, D or F in equatorial or axial position; m = 1-4; R9 and R10 = identical or different H, D, F or 1-10C perfluoroalkyl). Also claimed are: (i) thermoplastically processable polymer of formula (V): whereby the sum of the molar fractions x, y and z = 1 and x, y and z = 0-1 respectively, and the degree of polymerisation is 5-10 000; and (ii) prepn. of (I) by extrusion of the core followed by its coating. The coating is a fluoropolymer deriv. from 10-100 wt.% at least one monomer of vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene, fluorovinyl ethers, alkyl esters esp. fluoroalkyl esters of methacrylic- or a-fluoroacrylic acid, and fluorodioxalenes. ADVANTAGE - The thermoplastic polymer materials are highly transparent and easily extruded and used above 100 deg.C. without limiting transmission length and an increase in damping. They have good oxidn. stability, high temp. resistance and high weathering resistance. (I) has low light damping, high long-lasting temps. and good mechanical properties.