Abstract:
A process for rendering natural and synthetic materials and blends of the same flame retardant which entails treating the same with an aqueous dispersion of the flame retardant agent reduced to a finely divided state suspended in a latex medium and applied to the material with a finely divided metal oxide as synergist, by any convenient means; dried and set in place by baking. The active flame retardant agents are chlorinated cyclopentadieno compounds, chlorobrominated cyclopentadieno compounds, applied alone or in admixture with each other, or in admixture with brominated cyclopentadieno compounds, and in admixture with metallic oxides. The active flame retardant agents are reduced to a fine state of subdivision, preferably under 2 microns average particle diameter.
Abstract:
Bonded fibrous nonwoven textile fabrics having excellent strength and textile-like softness, drape and hand which are intermittently bonded with synthetic resins in predetermined print patterns of binder areas having a relatively high, uniform concentration of from about 50 to about 120 percent by weight of resin binder in the binder areas, based on the weight of the fibers therein, said binder areas having very sharply defined borders or edges with a minimum of binder feathering thereat whereby the optical density of the bonded fibrous nonwoven textile fabric very sharply increases from substantially zero to a maximum of at least from about 0.6 to about 1.0 or greater in a distance of less than about 1 mm. (0.04 inch), and methods of depositing such synthetic resins from colloidal aqueous dispersions thereof onto wet fibrous webs to form the bonded fibrous nonwoven textile fabrics, comprising the use of (1) metal complex coordination compounds and (2) synthetic resins and/or surfactants, at least one of which contains a specific coordinating ligand capable of being affected by ions of said metals to control the total migration of the resin binder during such deposition.
Abstract:
A multilayer web or article of insulating material which essentially includes at least one flame-resistant layer having polyacyloxalamidrazone fibers bearing at least one metal, preferably zinc, tin or calcium, in chemically combined form. These articles or materials are especially suitable in the manufacture of rescue suits, protective clothing and protective linings.
Abstract:
AN IMPROVED PROCESS IS PROVIDED FOR THE FORMATION OF FIBROUS MATERIALS OF ENHANCED THERMAL STABILITY DERIVED FROM ACRYLIC POLYMERS CONSISTING PRIMARILY OF RECURRING ACRYLONITRILE UNITS. A MINOR QUANTITY OF A LEWIS ACID CAPABLE OF PROMOTING THE CYCLIZATION OF PENDANT NITRILE GROUPS IS INCORPORATED IN A SOLUTION OF THE ACRYLIC POLYMER, A CYCLIZED ACRYLIC MATERIAL IS FORMED WITHIN THE SOLUTION AT AN ELEVATED TEMPERATURE, THE RESULTING SOLUTION IS SPUN TO FORM A CYCLIZED ACRYLIC FIBROUS MATERIAL WHICH IS SOLUBLE IN,N-DIMETHYLFORMAMIDE, AND THE RESULTING CYCLIZED ACRYLIC FIBROUS MATERIAL IS HEATED IN AN OXYGENCONTAINING ATMOSPHERE UNTIL A STABILIZED FIBROUS PRODUCT IS FORMED WHICH IS CAPABLE OF UNDERGOING CARBONIZATION AND WHICH IS INSOLUBLE IN N,N-DIMETHYLFORMAMIDE. THE STABILIZED FIBROUS MATERIAL MAY NEXT OPTIONALLY BE CARBONIZED OR CARBONIZED AND GRAPHITIZED AT ELEVATED TEMPERATURES WHILE PRESENT IN AN INERT ATMOSPHERE.
Abstract:
AN IMPROVED PROCESS IS PROVIDED FOR THE FORMATION OF FIBROUS MATERIALS OF ENHANCHED THERMAL STABILITY DERIVED FROM ACYRLIC POLYMERS CONSISTING PRIMARILY OF RECURRING ACRYLONITRILE UNITS. A MINOR QUANTITLY OF A LEWIS ACID CAPABLE OF PROMOTING THE CCLIZATION OF PENDANT NITRILE GROUPS IS INCORPORATED IN A SOLUTION OF THE ACRYLIC POLYMER AND A CYCLIZED ACRYLIC MATERIAL IS FORMED THEREIN WHICH IS SUBSEQUENTLY SPUN INTO A FIBER WHICH EXHIBITS NO APPRECIABLE EXOTHERMIC REACTION WHEN HEATED TO 500* C. UPON SUBJECTING THE RESULTING FIBER TO RELATIVELY MILD PREOXIDATION CONDITIONS A STABILIZED FIBROUS MATERIAL MAY BE FORMED WHICH OPTIONALLY MAY BE CARBONIZED OR CARBONIZED AND GRAPHITIZED AT ELEVATED TEMPERATURES WHILE PRESENT IN AN INERT ATMOSPHERE.
Abstract:
A new composition of an emulsion polymerized resin and certain metal salts, wherein the metal ion has a valence of at least 3; and a method of controlling resin deposition on materials by pretreating the materials whereby they have an alkaline condition and by applying the new composition to the material under alkaline conditions.