Patent GB-1485769-A (GB)
Title: Process for treating fibres
IPC: D06M101/16
Filed: 1973-12-18
Abstract: 1485769 Treating textiles DOW CORNING Ltd 13 Dec 1974 [18 Dec 1973 22 Oct 1974] 58604/73 and 45727/74 Heading DIP Knitted or woven synthetic fibre fabrics, or an agglomeration of synthetic fibres are treated with a composition comprising (A) a polydiorganosiloxane having terminal silicon bonded hydroxyl radicals and a M. wt. of at least 750, at least half the organic substituents being methyl and any other organic substituents being monovalent hydrocarbon radicals having 2 to 30 carbon atoms, (B) an organosilane RSiR a 'X 3-a  where R is a monovalent radical composed of carbon, hydrogen, nitrogen and optionally oxygen, containing at least two amine or imine groups and attached to silicon through a silicon to carbon bond R' is an alkyl or aryl radical, X is an alkoxy or alkoxyalkoxy radical having 1 to 14 carbon atoms and a to 0 or 1, and/or a partial hydrolysate of said organosilane, and (C) a silane R" b SiZ 4-b , where R" is a hydrogen atom, a   monovalent hydrocarbon radical or a monovalent halogenated hydrocarbon radical, Z is an alkoxy or alkoxyalkoxy radical having 1 to 4 carbon atoms and b is 0 or 1, and/or a partial hydrolysate of said silane, the composition being cured after application. Preferably the fibres are nylon, polyester or acrylic or blends thereof with cellulosic fibres, e.g. a 65/35 polyester/cotton blend. The treatment improves the resiliency of each fibre and the crease-recovery, resilience recovery, tear resistance, abrasion resistance, snag resistance and handle of the fabrics. Preferably polysiloxane (A) has a M. wt. of 750 to 90,000, a viscosity of 100 to 50,000 cS at 25C and is a dimethylsiloxane. If non- methyl substituents are present they may be ethyl, propyl, butyl, n-octyl, tetradecyl, octadecyl, cyclohexyl, vinyl, allyl, phenyl, tolyl or benzyl. Up to 5% of the substituents may be non-terminal hydroxyl. Radical R in organosilane (B) may be -(CH 2 ) 3 NHCH 2 CH 2 NH 2 , -(CH 2 ) 4 NHCH 2 CH 2 NHCH 3 , -CH 2 CH . CH 3 CH 2 NHCH 2 CH 2 NNH 2 , -(CH 2 ) 3 NHCH 2 CH 2 NHCH 2 CH 2 NH 2 , -(CH 2 ) 3 NH(CH 2 ) 2 NHCH 2 CH 2 CO 2 H 3  and CH 2 CH 2 NH 2    -(CH 2 ) 3 NHCH 2 CH 2 CH(OH 2 ) 3  NH 2 . Radical X is methoxy, isopropoxy, hexoxy, decyloxy or methoxyethoxy. If present R' may be methyl, ethyl, propyl, octyl or phenyl. Radical R" in silane (C) may be hydrogen, methyl, ethyl, propyl, butyl, hexyl, decyl, octadecyl, vinyl, allyl,-phenyl, tolyl, benzyl, chloromethyl, bromomethyl, chlorophenyl or CF 3 CH 2 CH 2 -. Radical Z may be methoxy; ethoxy, propoxy or methoxyethoxy. Thus (C) or its hydrolysate may be methyltrimethoxysilane, ethyltrimethoxysilane, n-propyltriethoxysilane, phenyltriethoxy silane, ethyl polysilicate, tetraethyl orthosilicate, n-butyl orthosilicate or ethyltrimethoxysilane.  The composition may contain a condensation catalyst (D) selected from dibutyltin dioctoate, diacetate or dilaurate, dioctyltin diacetate, lead 2-ethyl-hexoate, zinc or stannous octoate, cobalt or stannous naphthenate, tetrabutyl titanate, tetra-isopropyl titanate, disopropoxytitanium di (ethylaceto acetate), dibutyltin diethoxide, dioctyltin dimethoxide and diacetoxytetraalkyldistannoxane. The composition comprises 0.5 to 25 parts by wt. of (B), 1 to 25 parts of (C) and 0.5 to 15 parts -of (D) per 100 parts of (A). It may also include 1 to 15% of a specified alcohol or glycol, based on the weight of (A), (B) and (C) to extend the life of the composition. It is applied from non-aqueous solution or an aqueous or non-aqueous dispersion by padding or spraying to give a product having 0.1 to 40% of the composition based on the wt. of the fibres. The composition is cured by heating the product to 110 to 180C for e.g. 3 to 5 minutes or by ageing at room temperature.