Patent GB-1072315-A (GB)
Title: A method for providing anti-static and/or soil resistant finish
Inventor: BUTLER ROBERT JONES
IPC: D06M11/45
Filed: 1965-02-03
Abstract: In a method of producing an anti-static and/or rail resistant finish on a surface, there is applied to the surface an aqueous acid suspension of colloidal alpha-alumina monohydrate, the suspension having been prepared by hydrolysis in an aqueous medium of an aluminium alkoxide, recovering the colloidal a -alumina from the aqueous phase of the hydrolysis and contacting the colloidal alumina with an aqueous acid suspension medium.  After application of this suspension to the surface the suspension medium is removed.  The aqueous acid is preferably dilute acetic acids, but other acids of high or low ionization constant such as hydrochloric, nitric, sulphuric, formic, propionic and chloroacetic acids may be used.  The aqueous acid suspension of colloidal a -alumina may be converted to a dry free-flowing powder by conventional methods and then re-dispersed in water (requiring vigorous agitation) or in dilute acid (requiring mild agitation).  The contacting of the colloidal alumina with aqueous acid is preferably effected by "working", i.e. by any operation which effects abrasion of the alumina particles, such as agitation, milling, high speed stirring or high pressure impingement of the particle slurry.  The aluminium alkoxides preferred are those of the general formula <FORM:1072315/C1/1> where x, y and z are from 2-100.  Exemplified are triethoxyaluminium, diethoxyaluminium n-butoxide, ethoxybutoxyaluminium n-pentoxide and tri-n-dodeconoxyaluminium.  Reference has been directed by the Comptroller to the Specification 1,022,944.ALSO:A method of providing an anti-static and/or soil resistant finish on the surface of fabrics comprises hydrolysing an aluminium alkoxide in an aqueous medium, recovering from the aqueous phase of the hydrolysis colloidal alpha-alumina monohydrate, contacting said colloidal alpha-alumina with an aqueous acid suspension medium, applying the resulting suspension to the surface and removing the suspension medium. Surfaces which may be treated include fabrics produced from acrylic fibres, wool, nylon or wool and nylon, e.g. carpets, rugs, textile fabrics, automobile upholstery, suiting fabrics and sheeting. The treatment may be effected by spraying or brushing the yarn with the suspension or by immersing the yarn in a bath of the suspension.  If the yarn has already been incorporated into a fabric the surface may be treated with an applicater roll carrying the suspension.  The fabric or yarn may be dried in a circulating air oven.  The aqueous acid so preferably dilute acetic acid, but other acids of high or low ionisation constant such as hydrochloric, nitric, sulphuric, formic, propionic and chloroacetic acids may be used.  The aqueous acid suspension of alumina may be converted to a dry, free flowing powder by conventional methods and then re-dispersed in water or in dilute acid.  The contacting of the colloidal alumina with aqueous acid is preferably by "working" i.e. by any operation which effects abrasion of the alumina particles such as agitation, milling, high speed stirring or high pressure impingement of the particle slurry.  The aluminium alkoxides preferred are those of the general formula <FORM:1072315/D1-D2/1> where x, y and z are from 2-100.  Exemplified are triethoxyaluminium, diethoxyaluminium n-butoxide, ethoxybutoxyaluminium n-pentoxide and tri-n-dodecanoxyaluminium. Reference has been directed by the Comptroller to Specification 1,022,944.ALSO:A method of providing an anti-static and/or soil-resistant finish on a surface comprises hydrolysing an aluminium alkoxide in an aqueous medium, recovering from the aqueous phase of the hydrolysis colloidal a -alumina-monohydrate, contacting said colloidal a -alumina with an aqueous acid suspension medium, applying the resulting suspension to the surface and removing the suspension medium.  Surfaces which may be treated include fabrics produced from acrylic fibres, wool, nylon or wool and nylon, and films of vinyl polymers such as polyvinylidene chloride.  The suspension may be applied to a surface by applying the suspension to an applicator roll which is then brought into contact with the surface, alernatively the surface may be immersed in the suspension.  Removal of the suspension medium may be effected by any convenient drying technique.  The aqueous acid is preferably dilute acetic acid, but other acids of high or low ionisation constant such as hydrochloric, nitric, sulphuric, fermic, propionic and chloracetic acids may be used.  The aqueous acid suspension of alumina may be converted to a dry, free-flowing powder by conventional methods and then re-dispersed in water or in dilute acid.  The contacting of the colloidal alumina with aqueous acid is preferably effected by "working", i.e. by any operation which effects abrasion of the alumina particles, such as agitation, milling, high speed stirring or high pressure impingement of the particle slurry.  The aluminium alkoxides preferred are those of the general formula <FORM:1072315/B1-B2/1> where x, y and z are from 2-100.  Exemplified are treithoxyaluminium, diethosxylaminium n-butoxide, ethoxybutoxyaluminium n-pentoxide and tri-n-dodecanoxyaluminium.  Reference has been directed by the Comptroller to Specification 1,022,944.