Abstract: A dyed or undyed polyamide substrate, preferably film, fiber, or an article manufactured therefrom, with excellent breaking strength retention and ultimate elongation retention, is prepared by reacting a sufficient number of amine and/or amide-forming functional groups of a hindered amine with the end groups of the polyamide precursor(s) at a temperature sufficient for polymerization to occur, to thereby bind the hindered amine to the polyamide and inhibit migration, leaching, and volatilization of the hindered amine. The hindered amine is represented by the formula: ##STR1## in which R.sub.1 comprises the amine or amide-forming functional group;R.sub.2 is alkyl; andR.sub.3 is selected from the group consisting of hydrogen; alkyl of 1 to 3 carbons; and --OR.sub.4 in which R.sub.4 is selected from the group consisting of hydrogen, methyl, and alkyl of 1 to 7 carbons.The light stabilized polyamide substrate has particular utility in flags, decorative banners, and personal flotation device covers.

Abstract: A synthetic yarn made from a blend of base fibers selected from the group consisting of polyester, nylon 6 and nylon 66, and 1-12 weight percent of a heat activated binder fiber having a melting point within the range of 165.degree.-190.degree. C., said binder fiber being made from a copolyamide which is derived from a mixture of 50 to 85 wt. % caprolactam, 0 to 40 wt. % hexamethylenediamine adipate or a combination of hexamethylenediamine and adipic acid, and optionally a salt selected from the group consisting of hexamethylenediamine dodecanedioate, hexamethylenediamine azeleate, hexamethylenediamine sebacate and hexamethylenediamine terephthalate; and a chain terminator selected from at least one of the group consisting of a fatty acid and a fatty amines, wherein said fatty acid or fatty amine include at least 14 carbon atoms.

Abstract: The invention is directed to a process for producing bulked synthetic multifilament yarn comprising a plurality of continuous synthetic filaments having deposited thereon at intermittent intervals an adhesive polymer component having a melting temperature below that of the continuous synthetic filaments. The process comprises texturizing synthetic multifilament yarn to obtain desired bulk characteristics by directing heated yarn in a current of heated fluid against a yarn plug contained in a texturizing chamber, applying said adhesive polymer component in a molten condition to the surface of said yarn plug, and continuously discharging texturized yarn from said texturizing chamber at a lower linear rate than the feed rate of said yarn to said texturizing zone while said adhesive polymer component is still in a molten but solidifying state, resulting in bulked synthetic multifilament yarn having the adhesive polymer component deposited thereon at intermittent intervals.

Abstract: A melt-blown water-absorbing matt of fibers comprises a block copolyetheramide having polyether and polyamide segments. The matt structure provides excellent water absorbency and displays good resilience when exposed to humid conditions.

Abstract: This invention is a water-resistant film for lamination to a textile material, and the flexible, laminated product produced therewith. The film has a permeability of at least 0.0008 metric perm-cm. at 20.degree. C. and 65 percent relative humidity and of at least 0.0006 metric perm-cm. at 30.degree. C. and 50 percent relative humidity. The film is formed from a block copolymer having a number average molecular weight of from about 15,000 to about 35,000. The block copolymer contains polymer segments prepared by the amination of a polyether formed by treating a polyethylene glycol with an alkylene oxide of three or more carbon atoms. The product is a laminant of a layer of the described film and a layer of a textile material, and is useful in the formation of water-resistant, moisture permeable articles such as garments, tarpaulins, tents, and the like.

Abstract: This invention is a water-resistant film for lamination to a textile material, and the flexible, laminated product produced therewith. The film has a permeability of at least 0.0008 metric perm-cm. at 20.degree. C. and 65 percent relative humidity and of at least 0.0006 metric perm-cm. at 30.degree. C. and 50 percent relative humidity. The film is formed from a block copolymer having a number average molecular weight of from about 15,000 to about 35,000. The block copolymer contains polymer segments prepared by the amination of a polyether formed by treating a polyethylene glycol with an alkylene oxide of three or more carbon atoms. The product is a laminant of a layer of the described film and a layer of a textile material, and is useful in the formation of water-resistant, moisture permeable articles such as garments, tarpaulins, tents, and the like.

Abstract: This invention is a method to improve retention of a finish on nylon yarn, said finish containing the reaction product of epichlorohydrin with the reaction product of pyromellitic dianhydride with a long chain fluoroalcohol, comprising polymerizing said nylon in the presence of about 0.5 to 1 mole percent of a primary-tertiary diamine of the structure ##STR1## where R.sub.1 is an alpha, omega-alkylene group of 2 to 10 carbon atoms where cycloaliphatic, R.sub.2 and R.sub.3 are alkyl radicals of 1 to 4 carbon atoms, R.sub.4 is an alkylene radical of 1 to 10 carbon atoms and R.sub.5 is R.sub.4 or arylalkyl, R.sub.6 is H or alkyl of 1 to 4 carbons, so that said nylon polymer is melt stable. Also, for batch processing, polyethyleneimines of 300 to 1200 molecular weight, methylaminobispropylamine, N-(2-aminoethyl)-1,3-propanediamine, and 3,3'-iminobispropylamine are useful.

Abstract: This invention is a nylon fiber useful for improved comfort for wearers of apparel fabric made therefrom comprising (a) from about 5 to 15 percent by weight of poly (N,N-dimethylacrylamide) having a molecular weight which in a 25% aqueous solution gives a viscosity of from about 20 to 1 000 centipoise (0.02 to 1.0 Pa.s) at 25.degree. C. and (b) correspondingly from about 85 to 95% by weight nylon.

Abstract: This invention is a nylon fiber useful for improved comfort for wearers of apparel fabric made therefrom comprising (a) from about 5 to 15 percent by weight of poly (N,N-dimethylacrylamide) having a molecular weight which in a 25% aqueous solution gives a viscosity of from about 20 to 1 000 centipoise (0.02 to 1.0 Pa.s) at 25.degree. C. and (b) correspondingly from about 85 to 95% by weight nylon.

Abstract: This invention is a transparent alcohol resistant, hot water resistant, thermoplastically formable copolymer of (A) 80.4 to 88.8 weight percent epsilon-caprolactam and the remaining (B) 11.2 to 19.6 weight percent of substantially equimolar portions of a moiety derived from (1) a diamine or diisocyanate and (2) a diacid or (c) 11.2 to 19.6 weight percent para amino benzoic acid.

Abstract: High molecular weight linear condensation polyesters are stabilized against deterioration by heat by reacting the polyester in molten form with alkylene carbonates in the presence of a catalytic amount of a compound selected from the group consisting of sodium thiocyanate and potassium thiocyanate.

Abstract: This invention is a method to reduce pressure drop in polyamide process piping comprising injecting linear polyethylene glycol having a molecular weight above 10,000 around the periphery of the piping and forming a coating of the polyethylene glycol on the internal surface of the piping where it lubricates the flowing polyamide.

Abstract: When from about 0.5% to about 5% of N,N'-disubstituted thioureas are coated on nylon fiber, improved dyefastness is achieved compared to an untreated dyed nylon fiber when this fiber is exposed to ozone.