Patent GB-828797-A (GB)
Title: Resinous compositions
IPC: D06M15/333
Filed: 1956-04-12
Abstract: Textiles are provided with a water-repellent and crease-resistant finish and are given an improved handle and an improved shrinkage control by treating with an aqueous dispersion of a methyl hydrogen polysiloxane and 0.5 to 14 parts by weight per part of polysiloxane of a partially polymerized colloidal cationic aminotriazine-aldehyde condensation product, associated with 0.5 to 7 mols. of an acid per mol. of condensation product on a monomeric basis, and drying the treated textile to insolubilize the resin.  A glazed or embossed finish may be provided after partial drying, followed by complete drying.  The polysiloxanes are fluids containing 1 to 1.5 methyl radicals and 0.75 to 1.25 siliconbonded hydrogen atoms per silicon atom and the sum of methyl groups and hydrogen atoms is 2 to 2.25 per silicon atom. They may be used in admixture with other polysiloxanes. A catalyst for the siloxane is desirable, e.g. sodium aluminate or iron, cobalt, manganese, lead and zinc salts of carboxylic acids. These may be added to the composition or applied to the fabric before or after treatment.  The aminotriazine resin may be prepared from melamine, N-guanyl melamine, ammeline, formo-, aceto-, propio- and phenyl-guanamine and N-alkyl and aryl substituted derivatives. Methylol melamines and their alkylated derivatives are preferred, prepared as described in Specifications 623,355 and 566,347. Suitable acids are acetic, formic, propionic, gluconic, glycollic, lactic, hydrochloric, sulphuric and phosphoric.  Any type of fibrous material may be treated; specified are cotton, linen, flax, ramie, manila, hemp. rayons, wool, silk, nylon, polyesters, acrylonitrile polymers and copolymers and vinyl chloride-vinylidene chloride copolymers. Drying may be effected at 65 DEG  F. but preferably above 180 DEG  F. Other materials may be included in the compositions, e.g., aluminium oxide and phosphate, titanium dioxide and silica.ALSO:A composition for providing water-repellent finishes on p textiles comprises an aqueous dispersion of a methyl hydrogen polysiloxane and 0.5 to 14 parts by weight, per part of polysiloxane, of a partially polymerized colloidal cationic aminotriazine-aldehyde condensation product, associated with 0.5 to 7 mols. of an acid per mol. of condensation product on a monomeric basis.  The polysiloxanes are fluids containing 1 to 1.5 methyl radicals and 0.75 to 1.25 Si-bonded hydrogen atoms per silicon atom and the sum of methyl groups and hydrogen atoms is 2 to 2.25 per silicon atom.  They may be used in admixture with other linear or cyclic siloxanes, of which a number is specified, and particularly with fluid dimethyl polysiloxanes having viscosities between 1000 and 100,000 centistokes.  A catalyst for the siloxane is desirable, examples being sodium aluminate and iron, cobalt, manganese, lead and zinc salts of carboxylic acids. These may be added to the composition or applied to the fabric before or after treatment.  The siloxane and catalyst, which may be in solution, for example in mineral spirits, are emulsified with known dispersing agents, e.g. polyvinyl alcohol, nonyl phenol-ethylene oxide condensates, fatty acid-ethylene oxide condensates, and polyethylene glycol tert. dodecyl thioether.  The aminotriazine resin may be prepared from melamine, N-guanyl melamine, ammeline, formo-, aceto-, propio- and phenyl-guanamine and N-alkyl and aryl substituted derivatives.  Methylol melamines and their alkylated derivatives are preferred, prepared as described in Specifications 566,347 and 623,355.  Aldehydes other than formaldehyde which may be used include paraformaldehyde, hexamethylene tetramine, benzaldehyde, furfural, acetaldehyde and paraldehyde.  Suitable acids are acetic, formic, propionic, gluconic, glycollic, lactic, hydrochloric, sulphuric and phosphoric.  Curing of the compositions may be effected at 65 DEG  F. but preferably above 180 DEG  F.  Other materials may be included in the compositions, e.g. aluminium oxide and phosphate, titanium dioxide and silica.