The present invention relates to polyphosphazenes, polyurethanes based on these polyphosphazenes, methods for their manufacture and hydrogels based on the polyurethanes. The invention further relates to the use of the hydrogels in medical, veterinary and agricultural applications. The terminal ends of the polyphosphazenes bear NCO-reactive hydrogen atoms for reaction with polyisocyanates.

The present invention relates to polyphosphazenes, polyurethanes based on these polyphosphazenes, methods for their manufacture and hydrogels based on the polyurethanes. The invention further relates to the use of the hydrogels in medical, veterinary and agricultural applications. The terminal ends of the polyphosphazenes bear NCO-reactive hydrogen atoms for reaction with polyisocyanates.

The polyurethane flame retardant is prepared by compounding poly(diphosphophosphazene) (PDPP) and derivatives thereof, poly(diphosphate phosphazene) (MPDPP) (where M=Mg.sup.2+, Ca.sup.2+, transition metal ions, rare earth ions and the like) and poly(diphosphonic phosphazene). Since a phosphate group in the PDPP and an unreacted phosphate group in the MPDPP in the compound and an unreacted hydroxyl in the phosphate group may react with isocyanate, the flame retardant is a reactive flame retardant. Due to the reaction between the flame retardant and the isocyanate, the flame retardant is uniformly distributed in polyurethane and has a better flame-retardant effect. The flame retardant contains multiple flame-retardant components, namely polyphosphazene group, phosphate ester and phosphate salt. Due to the synergistic effect, the flame retardant has good flame-retardant properties, and can be used for various polyurethane materials.

A structural flame retardant high strength low exothermic polymer grouting material for consolidating, belonging to a technical field of polyurethane material, is produced by combined the polyether polyol and the modified isocyanate in a weight ratio of 100:(100-160), leading to internal reaction temperature ?100? C., strength ?60 mPa, bonding ?3 mPa, oxygen index ?28% while no halogen and no effect on water quality, odor level (80? C.) ?3.5, and fog test ?5 mg (which means no physical additive flame retardant is diffused into the environment). In particular, with no halogen, which is known as environmental hormones, in the plasticizers, there will be less combustion smoke, wherein the present invention will not release corrosive or irritating hydrogen halide gas, nor produce toxic carcinogens polybrominated benzoxins and polybrominated dibenzofurans, thereby avoiding the long-term impact of the material on the environment.

The present invention relates to a flame retardant waterborne coating composition comprising: a) water dispersed hydroxyl-terminated polyurethane particles, and b) isocyanate crosslinker, wherein (i) the hydroxyl-terminated polyurethane contains phosponate oligomer as a building block in an amount of from 3 to 75 parts by weight relative to the hydroxyl-terminated polyurethane, wherein the phosphonate oligomer contains units according to the following structural formula in which n is an integer from 1 to 20, R is a C.sub.1-20 alkyl, C.sub.2-20 alkene, C.sub.2-20 alkyne, C.sub.5-20 cycloalkyl or C.sub.6-20 aryl, and R.sub.2 is an aliphatic or aromatic group, (ii) the hydroxyl number of the hydroxyl-terminated polyurethane is from 5 to 180 mg KOH/g polyurethane, (iii) the molar ratio of hydroxyl groups present in the hydroxyl-terminated polyurethane to isocyanate groups of the crosslinker is from 0.2 to 2.0.

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The present invention relates to an elastomeric polyurethane comprising at least a first flame retardant in an amount of 5% to 9% by weight based on the total weight of the elastomeric polyurethane and at least one mineral filler in an amount of 3% to 5% by weight based on the total weight of the elastomeric polyurethane, wherein the at least a first flame retardant is at least one phosphorous comprising polyol, wherein the at least one mineral filler is selected from the group consisting of carbonates, sulfates, silicates, mixtures and hydrated modifications thereof and wherein the total amount of the first flame retardant and the mineral filler is in the range of 10% to 14% by weight, based on the total weight of the elastomeric polyurethane, to a process for the preparation of said elastomeric polyurethane, to the use of these elastomeric polyurethane in offshore applications, mine and quarries applications, pulp and paper applications, shoe soles applications, handling applications, military application, transport application, railway and industrial rolls, industrials tires, electric encapsulation, wheels, rollers, doctor blades, hydro cyclones, sieves, sport tracks, insulating panels, acoustic insulations, wind blades or bumpers, and to offshore applications, mine and quarries applications, pulp and paper applications, shoe soles applications, handling applications, military application, transport application, railway and industrial rolls, industrials tires, electric encapsulation, wheels, rollers, doctor blades, hydro cyclones, sieves, sport tracks, insulating panels, acoustic insulations, wind blades or bumpers comprising such a polyurethane.