Light wave guide and new polymers - are based on poly:norbornene or poly:norbornadiene prods. partic. contg. fluoro or fluoro-alkyl substits.

摘要

In light wave guides comprising (A) a core having refractive index n(K) and (B) sleeve of polymer of refractive index n(M), where n(K)/n(M) is more than 1.01. (1) (A) is of polycarbonate or polymer contg. units derived from opt. substd. styrene or an acrylate, methacrylate or a fluoroacrylate and (B) contains 0.1-100 % (all pts. wt) on total (B) units derived from at least one monomer of formula (1)-(3); or (2) (A) contains 0.1-100% on total (A) units derived from at least one monomer of formula (1)-(3), and (B) is of fluoropolymer; or (3) both (A) and (B) contain 0.1-100% on total (A) or (B) units derived from at least one monomer of formula (1)-(3). In formula (1)-(3) (symbols have same or different meaning in same monomer units and/or adjacent monomer units) R1-R4 = H, D, F or branched or unbranched 1-10C perfluoroalkyl R6, R6 (equitorial or axial) = H, D, or F; m = 1-4; R7, R8 = H, D, F, or 1-10C perfluoroalkyl; X = O or CH2. Thermoplastically processable polymers (I) of formula (4) x, y and z each = 0-1, and (x+y+z) = 1, where degree of polymerisation is 5-10,000. (prepn. of (I) is not described). Prepn. of light wave guides as above by extrusion of core (A) and surrounding (A) by (B) where, (a), (A) and (B) are as in (1) above; or (b) (A) is as in (2) above and (B) is derived from monomer (II) which is vinylidene fluoride, tetrafluorethylene, hexafluoropropane, fluorovinyl ether, methacrylate or alpha-fluoroacrylate ester, and/or a fluorodioxol. ADVANTAGE - Waveguides are prepd. from readily obtainable monomers, can be readily extruded, and can be used at above 100 deg.C. without substantial increase in damping and limitation of transmission length. (I) for use as optical polymers, have very good stability to oxidn. high temp. and weathering, and do not crosslink on storing in air or processing in melt so hydrogenation is unnecessa