Hoechst Aktiengesellschaft

Hoechst Celanese Corporation

Clariant Corporation

Hoechstaktiengesellschaft

Hoechst Aktiengellschaft

Horst Staendeke

Franz-Josef Dany

Joachim Kandler

Ursus Thummler

Wilhelm Adam

Werner Klose

Daniel Scharf

Fritz-Reichard Fuchs

Martin Sicken

Gero Heymer

Werner Krause

Klaus Hestermann

Joachim Wortmann

Alexander Maurer

Bernd Lippsmeier

Hubert Neumaier

Georg Elsner

Theodor Auel

Daniel J Scharf

Siegfried Jung

Ursus Themmler

Werner Kloss

Reinhold Lagoda

The flame-resistant polyurethanes of the invention comprise, as flameproofing agents, mixtures of oligomeric phosphoric acid esters which carry hydroxyalkoxy groups, of the formula I ##STR1## in which q denotes an average chain length of 0.5 to 10, R.sub.1 is a hydroxyl-containing radical of the formula II a,

Flame-resistant polyurethanes

The invention relates to cyclic diphosphoric esters of the formula ##STR1## with R=methylethylene, 1,3-cyclohexylene, 1,4-cyclo-hexylene or 1,3-phenylene, a process for their preparation and their use as flame retardants.

Cyclic disphosphoric esters, a process for their preparation and their

The invention relates to a halogen-free, flame retardant rigid polyurethane foam based on polyether-polyols and polyisocyanates, which comprises, as the polyol component, mixtures of nitrogen-free and nitrogen-containing polyether-polyols and, as the flameproofing agent, ammonium polyphosphate.

Halogen-free, flame retardant rigid polyurethane foam

The invention relates to flame retardant polymeric compositions which comprise a halogen-free cyclic phosphoric acid ester of the formula (I) ##STR1## where R=phenyl or methyl substituted phenyl as a flameproofing agent.

Flame retardant polymeric compositions

Flame-resistant polyurea foam

Halogen-free, flame-resistant polymeric compositions contain an intumescence flameproofing system which comprises ammonium polyphosphate and an organophosphorus nitrogen component. The organophosphorus nitrogen component here is a phosphoric acid polyester according to the formula ##STR1## In these formulae, R is CH.sub.2, C.sub.2 H.sub.4 or C.sub.3 H.sub.6, while m is 1 to 10 and n is 1 to 6.

Halogen-free, flame-resistant polymeric compositions

The invention relates to phosphoric acid polyesters according to the formulae ##STR1## in which R is .dbd.CH.sub.2, .dbd.C.sub.2 H.sub.4 or .dbd.C.sub.3 H.sub.6 and m is 1 to 10 and n is 1 to 6. To prepare these phosphoric acid polyesters, the cyclic phosphoric acid ester 2,4,8,10-tetraoxa-3,9-dioxo-3,9-dihydroxy-phosphaspiro[5.5]-undecane is reacted with tris-hydroxyalkyl cyanurate or tris-hydroxyalkyl isocyanurate at temperatures of 120.degree. to 250.degree. C. in the presence of a catalyst for 2 to 12 hours, while mixing intensively.

Phosphoric acid polyesters and a process for their preparation

Flame-retardant polymeric compositions, preferably thermoplastic and especially polyolefin-based compositions, containing an intumescent flame-retardant system substantially comprised of a phosphorus component and an organic nitrogen component. The flame-retardant system is more particularly comprised of ammonium polyphosphate and tris-(2-hydroxyethyl) isocyanurate.

In a stabilized, pulverulent red phosphorus comprising phosphorus particles having a maximum particle size of 2 mm whose surface is covered with a thin layer of an oxidation stabilizer, the oxidation stabilizer is composed of tin oxide hydrate.

Stabilized red phosphorus

Phlegmatized, pulverulent red phosphorus with good free-flowing properties comprises 95 to 99.95% by weight of red phosphorus having a particle size of up to 2 mm, and 0.05 to 5% by weight of polyurethane as phlegmatization agent. This red phosphorus is prepared by introducing an aqueous polyurethane dispersion into an aqueous suspension of red phosphorus having a particle size of up to 2 mm, after a pH of from 5 to 9 has been set, in a manner such that 5 to 0.05 parts by weight of polyurethane are present per 95 to 99.95 parts by weight of red phosphorus, then stirring the mixture at a temperature of from 20 to 90.degree. C. for 0.5 to 3 hours, and finally drying the phlegmatized red phosphorus at elevated temperature after filtration.

Phlegmatized red phosphorus

Flame-retardant polymer compositions contain a flame-retardant system consisting of a phosphorus/nitrogen-component, aluminum hydroxide, and a least one synergetically active component selected from the group consisting of organic nitrogen compounds, polyalcohols or derivatives thereof, the phosphorus/nitrogen-component being ammonium polyphosphate, if desired.

Flame-retardant polymer compositions

Halogenated phosphonophosphoric acid esters of the general formula ##STR1## in which X stands for a halogen R' stands for an alkylene having from 1 to 4 carbon atoms A stands for ##STR2## R'' stands for identical or different alkyl groups having from 1 to 4 carbon atoms, a halogen or hydrogen, and R.sup.IV stands for a halogen or hydrogen, are made. To this end, phosphorus (III) chloride is reacted in a first step with an alkylene oxide in the presence of a catalyst; the resulting reaction product consisting substantially of phosphorous acid trialkylesters is freed from alkylene oxide in excess and reacted in a second step with a suitable halogenoacyl halide in a molar ratio of 2:1-1.5; the resulting phosphonophosphoric acid ester is repeatedly scrubbed with water and/or an aqueous solution of ammonia and then either separated or halogenated in a third step under ultraviolet light, repeatedly scrubbed with water and/or an aqueous ammonia solution, and separated.

Process for making halogenated phosphonophosphoric acid-esters and their

Flame-retardant polymer compositions containing a flame-retardant system consisting of a phosphorus/nitrogen-component and aluminum hydroxide.

Stabilized pulverulent red phosphorus consisting substantially of particles with a size of at most 2 mm, encapsulated in a thin layer of an oxidation stabilizer consisting of at least one scarcely water-soluble or water-insoluble metal hydroxide and a melamine/formaldehyde-polycondensation product.

Stabilized red phosphorus and process for making it

Self-extinguishing polymeric composition based on a polyolefin, especially polypropylene, of improved thermal stability containing an intumescent fire-retardant system comprised of a phosphorus constituent and a carbonaceous nitrogen constituent. The composition contains more particularly, as the phosphorus constituent, a product consisting substantially of

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Lohmar, Germany

Horst Staendeke