Patent GB-685201-A (GB)
Title: Improvements in or relating to a method of setting the twist, crimp or curl of keratinous fibres
Filed: 1948-11-22
Abstract: Compositions for treating keratinous fibres or yarns consist of a liquid medium comprising a urea-aldehyde, thiourea-aldehyde or amino-aldehyde thermosetting condensation product and a mercapto alcohol or mercapto polyalcohol or mercapto aliphatic carboxylic acid or salt thereof.  The resin is cured on the textile material by heating.  Amino-aldehyde condensation products may be formed from an aldehyde such as formaldehyde, and amines such as guanidine, or amino-s-triazines such as melamine or their alkylated derivatives; urea and/or thiourea modified amino-s-triazine-aldehyde precondensates or their alkylated derivatives may also be used. Mercapto compounds specified are 2-mercapto-ethanol, 2-mercapto-propanol, 3-mercapto-propanol, 1-thiosorbitol, 1-thioglycerol, thioglycollic acid, a - and b -mercapto - propionic acid and a  - mercapto - butyric acid. Salts of the acids such as the alkali metal, alkaline earth metal and ammonium salts may also be used.  Wetting agents such as sodium salts of sulphonated aromatic compounds having a long-chain substituted alkyl group, long-chain polyethylene oxides and their derivatives, aryl alkyl polyether alcohols and aliphatic polyether alcohols may also be added to the liquid compositions.  In an example, carpet yarn is treated with an aqueous solution containing a melamine-formaldehyde resin precondensate, 2-mercapto-ethanol, sodium cetyl benzene sulphonate, and 2-amino-, 2-methyl propanol phosphate.  The yarn is centrifuged until 14 per cent resin solids are retained, dried at 300 DEG  F. and then further heated at this temperature for 15 minutes to cure the condensation product.  Specification 685,202 is referred to.ALSO:Resin-impregnated keratinous fibres or yarns are prepared by treating with a liquid medium comprising a urea-aldehyde, thiourea-aldehyde or amino-aldehyde thermosetting condensation product and a mercapto alcohol or mercapto polyalcohol or mercapto aliphatic carboxylic acid or salt thereof, and heating the textile material to cure the resin.  The fibres or yarns may be incorporated in pile fabrics, or woven or knitted fabrics and may be of such fibres as sheep, lamb or alpaca wool, mohair, camel hair or angora wool.  Amino-aldehyde condensation products may be formed from an aldehyde such as formaldehyde, and amines such as guanidine, or amino-s-triazines such as melamine or their alkylated derivatives; urea and/or thiourea modified amino-s-triazine-aldehyde precondensates or their alkylated derivatives may also be used. Mercapto compounds specified are 2-mercapto-ethanol, 2-mercaptopropanol, 3-mercapto-propanol, 1-thiosorbitol, 1-thioglycerol, thioglycollic acid, a - and b -mercapto - propionic acid, and a  - mercapto - butyric acid. Salts of the acids such as the alkali metal, alkaline earth metal and ammonium salts may also be used.  Wetting-agents such as sodium salts of sulphonated aromatic compounds having a long chain substituted alkyl group, long chain polyethylene oxides and their derivatives, aryl alkyl polyether alcohols and aliphatic polyether alcohols may also be added to the liquid compositions.  In an example, carpet yarn is treated with an aqueous solution containing a melamine-formaldehyde resin precondensate, 2 - mercapto - ethanol, sodium cetyl benzene sulphonate and 2-amino-2-methyl propanol phosphate.  The yarn is centrifuged until 14 per cent resin solids are retained, dried at 300 DEG  F. and then further heated at this temperature for 15 minutes to cure the condensation product.  Specification 685,202 is referred to.