Patent GB-479804-A (GB)
Title: Improvements relating to the manufacture of artificial fibres
IPC: D01F6/04
Filed: 1937-03-06
Abstract: Fibres of high resistance to oxidation and laundering are made by extruding a substantially saturated linear hydrocarbon polymer of an olefine, e.g. isobutylene, or of hydrogenated rubber, having an average molecular weight above 40,000.  The fibres may be shaped directly by the extrusion, or may be obtained by cutting an extruded band or sheet of the polymer.  The shaped products may be made before, during or after polymerization.  For example, isobutylene or a solution or dispersion thereof is extruded into a vessel containing boron fluoride in liquid or gaseous phase or dissolved in a suitable solvent which may be a non-solvent for isobutylene polymer.  Again, the isobutylene may be polymerized in a solvent such as ethylene together with one or more compounding agents, e.g. plasticizers, fillers, oxidation inhibitors, pigments and dyes, a number of which are specified, the ethylene evaporated and the polymer dissolved in a solvent in amount equal to from 1 to 95 per cent of the final solution.  An oil soluble ammonium, phosphonium, sulphonium or selenonium base may be incorporated at this stage and the mass extruded into a bath of a non-solvent liquid or into air, inert gas, steam or ammonia.  According to another method, an emulsion of the polymer is extruded into a bath which breaks down the emulsion. Threads of larger diameter may be obtained by extruding the polymer alone under high pressure and temperature.  Fibres may be covered with threads of textile material allowing stretching of the fibre of 5 to 60 per cent of the original length before stretching of the textile threads occurs.  Specification 479,478 is referred to.ALSO:Fibres of high resistance to oxidation and laundering are made by extruding a substantially saturated linear hydrocarbon polymer of an olefine, e.g., isobutylene, or of hydrogenated rubber, having an average molecular weight above 40,000.  The fibres may be shaped directly by the extrusion, or may be obtained by cutting an extruded band or sheet of the polymer.  The shaped products may be made before, during or after polymerization.  For example, isobutylene or a solution or dispersion thereof is extruded into a vessel containing boron fluoride in liquid or gaseous phase or dissolved in a suitable solvent which may be a non-solvent for isobutylene polymer.  Again, the isobutylene may be polymerized in a solvent such as ethylene together with one or more compounding agents, e.g., plasticizers, fillers, oxidation inhibitors, pigments and dyes, a number of which are specified, the ethylene evaporated and the polymer dissolved in a solvent in amount equal to from 1 to 95 per cent of the final solution.  An oil soluble ammonium, phosphonium, sulphonium or selenonium base may be incorporated at this stage and the mass extruded into a bath of a non-solvent liquid or into air, inert gas, steam or ammonia.  According to another method an emulsion of the polymer is extruded into a bath which breaks down the emulsion.  Threads of larger diameter may be obtained by extruding the polymer alone under high pressure and temperature. Fibres may be covered with threads of textile material allowing stretching of the fibre of 5 to 50 per cent of the original length before stretching of the textile threads occurs.  Specification 479,478 is referred to.