Abstract: A group of diphosphonic acid tetra-esters and phosphonic or thiophosphonic acid 0,0,0-triesters containing dioxaphosphorinane rings are useful as flame retardants for polymeric organic materials, particularly polyesters. The compounds, some of which are novel, are prepared by reaction of the corresponding phosphites with peroxy compounds or with sulphur.

Abstract: A group of diphosphonic acid tetra-esters and phosphonic or thiophosphonic acid O,O,O-triesters containing dioxaphosphorinane rings are useful as flame retardants for polymeric organic materials, particularly polyesters. The compounds, some of which are novel, are prepared by reaction of the corresponding phosphites with peroxy compounds or with sulphur.

Abstract: Flameproofed cellulose, especially regenerated cellulose, includes as a flameproofing agent an 0,0,0-triester of phosphoric acid or of thiophosphoric acid.

Abstract: Flameproofed polymeric organic materials, e.g. regenerated cellulose, which include bis-(2-oxo-1,3, 2-dioxaphosphorinanyl) oxides, bis-(2-thiono-1,3,2 -dioxaphosphorinanyl) oxides and 2-oxo-1,3,2-dioxaphosphorinanyl-2'-thiono-1',3',2'-dioxaphosphorinanyl oxides, having at least one substituent on the dioxaphosphorinane rings, as flameproofing agents, and their production. Some of the flameproofing agents are new compounds and are included in the invention.

Abstract: Flameproofed, regenerated cellulose containing as a flameproofing agent a compound of the formula, ##STR1## in which both Y's, are oxygen or sulphur,both R.sub.1 's are cyclohexyl or optionally substituted phenyl, or additionally methyl when Y is sulphur, andboth R.sub.2 's are a radical --NR.sub.3 R.sub.4, whereinR.sub.3 is hydrogen or alkyl andR.sub.4 is alkyl, cyclohexyl or optionally substituted phenyl, orR.sub.3 and R.sub.4 together with the common nitrogen atom form a saturated heterocyclic ring,with the proviso that when Y is oxygen, R.sub.3 is hydrogen and R.sub.1 is optionally substituted phenyl, R.sub.4 is only optionally substituted phenyl.

Abstract: The present invention concerns novel flameproofed regenerated cellulose incorporating, as flameproofing agent, a phosphoric acid or thiophosphoric acid mono- or triamide.

Abstract: Flameproofed cellulose includes as a flameproofing agent a compound selected from esters, ester-amides and amides of pyrophosphoric, of mono-, di- and trithiopyrophosphoric, of triphosphoric, and of mono-, di-, tri- and pentathiotriphosphoric acids.

Abstract: Flameproofed polymeric organic materials include as a flameproofing agent a compound selected from esters, ester-amides and amides of pyrophosphoric, of mono-, di- and trithiopyrophosphoric, of triphosphoric, and of mono-, di-, tri- and pentathiotriphosphoric acids.

Abstract: Flameproofed cellulose includes as a flameproofing agent a compound selected from esters, ester-amides and amides of pyrophosphoric, of mono-, di- and trithiopyrophosphoric, of triphosphoric, and of mono-, di-, tri- and pentathiotriphosphoric acids. Preferred flameproofed cellulose, and other polymeric organic materials include as a flameproofing agent a compound selected from a smaller class of the above compounds.