Polycyclic phosphorous triamides of the formula ##STR1## in which R.sup.1 and R.sup.2, alike or different, are alkylene of 2 to about 6 carbons; R.sup.3 and R.sup.4, alike or different, are alkyl of 1 to about 8 carbons, cycloalkyl of 5 to about 8 carbons, or aralkyl where the aryl group is of 6 to about 12 carbons and the alkyl is of 1 to about 8 carbons; or R.sup.3 and R.sup.4 are joined together to form an alkylene group of 2 to about 6 carbons which may be interrupted by 1. a ##STR2## group where Q is hydrogen or alkyl of 1 to about 18 carbons, or 2. ONE OR TWO --O-- linkages; There are at least 2 carbons between each two hetero atoms in the outer ring system, and when the triamide is tricyclic, at least one of the chains between the nitrogens linked to phosphorus contains at least three atoms Are useful as flame retardants for cotton.
式为##STR1##的多环
磷三酰胺,其中R.sup.1和R.sup.2,相同或不同,均为2到约6个碳的烷基;R.sup.3和R.sup.4,相同或不同,为1到约8个碳的烷基,5到约8个碳的环烷基或芳基烷基,其中芳基的基团为6到约12个碳,烷基为1到约8个碳;或R.sup.3和R.sup.4相互连接形成2到约6个碳的烷基,可以被1.一个##STR2##群,其中Q为氢或1到约18个碳的烷基,或2.一个或两个--O--连接所打断;在外环系统中每两个杂原子之间至少有2个碳,当三酰胺为
三环时,至少有一条连接到
磷的氮之间的链含有至少三个原子。它们可用作棉花的防火剂。