Patent GB-745142-A (GB)
Title: Improvements in or relating to the production of threads, hairs, bristles, ribbons or similar shaped articles
IPC: D01F6/62
Filed: 1952-12-16
Abstract: In a process for the production of threads, hairs, bristles, ribbons, and similar shaped articles from polyesters, a polyester is reacted with a suitable metal-active compound, before, during, or after the formation of the shaped article therefrom, so that the metal is combined chemically with the polyester.  A suitable metal active compound is defined as an alcoholate or alkoxo salt of a di- or higher valent metal other than an alkaline earth metal, or a synthetic resin formed by the reaction of an alcoholate of a tri- or higher valent metal with a tautomeric compound containing a keto-enolic group or such a resin which has been treated with oxygen after formation.  The treatment of the polyester with the metal active compound may be carried out in solution, e.g. in aromatic hydrocarbon solvents.  The polyester may be an ester of a polybasic acid with an unsaturated alcohol or an ester of a polyhydric alcohol with unsaturated acid.  It may be a vinyl or allyl ester of a di- or poly-basic acid or an ester of a glycol, e.g. diethylene glycol or triethylene glycol, or of glycerol, pentaerythritol, butanetriol, trimethylolpropane, or sorbitol with an unsaturated higher fatty acid or dicarboxylic acid, e.g. maleic acid.  The polyester may be a natural or artificial oil such as wood-, castor-, linseed-, soya-bean-, or train-oil which has been polymerized by heating or oxidation.  It may be an alkyd resin or an oil- or fatty acid-modified alkyd resin or a copolymer of such a polyester with styrene, an acrylic acid ester, cyclopentadiene, or other vinyl compound.  An alcoholate or alkoxo salt of aluminium, titanium, or cobalt, may be used.  The alcoholate or alkoxo salt may be stabilized by the addition thereto of a b -ketocarboxylic ester such as ethylacetoacetate, or a malonic ester or b -diketone, e.g. acetylacetone.  A synthetic resin obtained by reaction of an aluminium or iron alcoholate, e.g. a butylate, with ethyl acetoacetate, formyl acetone or dimethyl malonate or such a resin which has been modified by treatment with oxygen at elevated temperature may be used.  In an example of the production of filaments, a glycerol phthalate resin modified with ricinoleic acid is heated to a plastic condition and then forced through a spinning nozzle.  The threads so formed are passed continuously through a setting bath which consists of a 50 per cent toluene solution of aluminium butylate to which is added 3-5 per cent of acetoacetic ester based on the aluminium butylate, the bath being maintained at 40-50 DEG  C.  The threads are then stretched, washed, and again stretched.  In another example, a highly viscous polyglycol ester of maleic anhydride and triethylene glycol is mixed with a synthetic resin formed by reacting 1 mol. of titanium butylate with 1.5 mol. of malonic acid diethyl ester.  The mixture is heated to 100 DEG  C. and led into a polymerization chamber which is heated to 150-180 DEG  C. From this chamber, the hot viscous material is passed to a spinning nozzle and extruded into a solution of 1 per cent formic acid in alcohol wherein the filaments so formed are stretched.  In another example, a styrenized alkyd resin containing castor oil is heated to 120 DEG  C. and extruded into a precipitation bath containing a toluene solution of aluminium butylate to which acetoacetic ester has been added, the temperature of the bath being at 40-50 DEG  C.  The threads so obtained are subjected to stretching and led through counter-flowing streams of hot water.  The aluminium butylate solution may be replaced by a solution of cobalt aluminium butylate in butanol.  Specifications 705,860, 718,283 and 718,284 are referred to.