Sandoz Gmbh

Claudine Mauric

Rainer Wolf

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.

Flameproofed organic materials

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.

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

Flameproofed regenerated cellulose and method

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.

Dioxaphosphorinane derivatives as flameproofing agents

Flameproofed, regenerated cellulose containing as a flameproofing agent a compound of the formula, ##STR1## in which both Y's, are oxygen or sulphur,

Regenerated cellulose flameproofed with organophosphorylamides

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

Flame retardant regenerated cellulose containing a phosphoric acid or

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.

Flameproofing dispersions containing phosphoric acid derivatives

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.

Phosphonic acid derivatives as flameproofing agents

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.

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Basel, Switzerland

Claudine Mauric