| abstract |
Compounds having the formula: <IMAGE> wherein X is oxygen or sulphur or the moiety X is absent; and A and D are the same or different and each is hydrogen. C1-C12 alkyl, (optionally substituted by one or two halogen atoms or by a cyano, C1-C3 alkoxy, or C2-C4alkoxycarbonyl), C3-C7 cycloalkyl, C7-C10 aralkyl or a phenyl group, (optionally substituted by one or two halogen, cyano, C1-C3 alkoxy, C2-C4 alkoxycarbonyl or C1-C4 alkyl groups), the group <IMAGE> or a group R%O- wherein R% is hydrogen, a C1-C12 alkyl group, (optionally substituted by one or two halogen atoms), C3-C7 cycloalkyl, C7-C10 aralkyl, a phenyl group, (optionally substituted by one or two halogen atoms or C1-C4 alkyl groups), or R% is a trimethylsilyl group; or A and D together with the phosphorus atom to which they are each attached form a 1,3,2- dioxaphospholane ring or a 1,3,2- dioxaphosphorinane ring, each optionally substituted by one or more C1-C3 alkyl; and where R% is hydrogen, the alkali, alkaline earth and amine salts and partial salts thereof; with the proviso that when A is the group R%O- and X is sulphur or absent then D cannot be hydrogen or the group <IMAGE> are useful as lubricant additives and for imparting flame retardancy to polymers. |