摘要:
A process for preparing a polybrominated product such as decabromodiphenyl ether and decabromodiphenyl ethane, which comprises brominating a reduced particle size precursor of said polybrominated product in an organic solvent or in bromine as a solvent, wherein the bromination is carried out either concurrently with or subsequent to said particle size reduction, forming the polybrominated product and separating the same from the reaction mixture.
摘要:
Novel smoldering suppressing compositions containing a metal complex of ammonium superphosphoric acid and having a high phosphate content, and processes for their preparation, are disclosed. Further disclosed are formulations containing these compositions and articles-of-manufacture having these formulations applied thereon. These novel formulations are particularly effective as smoldering suppressants for textiles, and are characterized by a high washing fastness.
摘要:
Isolated polynucleotide sequences exhibiting endothelial cell specific promoter activity, novel cis regulatory elements and methods of use thereof enabling treatment of diseases characterized by aberrant neovascularization or cell growth are disclosed.
摘要:
Novel formulations comprising pentabromobenzylbromide (PBBBr) and a carrier, for use as a flame retardant for application on a substrate, and processes for their preparation are disclosed. Further disclosed are articles-of-manufacture having these formulations applied thereon, and the use of PBBBr as a flame retardant for application on a substrate. These novel formulations are particularly effective as flame retardants for textiles, and are characterized by a low add-on and a high washing fastness.
摘要:
The present invention discloses a process for the preparation of highly pure pentabromobenzyl bromide, PBB-Br, wherein the benzylic bromination reaction is carried out in a suitable organic solvent in the presence of water and wherein the reaction temperature is such that it is sufficient to activate the initiator but not high enough to consume a substantial amount thereof.
摘要:
Novel formulations comprising pentabromobenzylbromide (PBBBr) and a carrier, for use as a flame retardant for application on a substrate, and processes for their preparation are disclosed. Further disclosed are articles-of-manufacture having these formulations applied thereon, and the use of PBBBr as a flame retardant for application on a substrate. These novel formulations are particularly effective as flame retardants for textiles, and are characterized by a low add-on and a high washing fastness.
摘要:
A fire retarded polymer composition is disclosed, which comprises a polymer component, at least one halogen-containing fire retardant and a heat expandable graphite. The polymer component is selected from among polystyrenes, polyesters and polyolefins. The halogen of the fire retardant is bromine or chlorine, and the total amount of the fire retardant and the heat expandable graphite is from about 6.5 to about 40% by weight. The composition may also contain a metal oxide fire retardant, such as antimony trioxide, but if so, it contains it in amounts much lower than those required in prior art compositions to achieve the same degree of fire retardancy. It is preferred that the heat expandable graphite be such as to expand 50 times or more on shock heating from room temperature to 900° C. The process by which the expandable graphite is produced is not critical, and it is known, for example, to produce it by oxidation of natural or artificial graphite.
摘要:
Isolated polynucleotide sequences exhibiting endothelial cell specific promoter activity, novel cis regulatory elements and methods of use thereof enabling treatment of diseases characterized by aberrant neovascularization or cell growth are disclosed.
摘要:
A flame retardant composition for flammable plastic materials and a method for producing the same are disclosed. The flame retardant composition comprises 2,4,6-tris(2,4,6-tribromophenoxy)-1,3,5-triazine that contains 1 to 1000 ppm of a metal species of a water-insoluble polyvalent metal compound selected from the group consisting of oxide, hydroxide, carbonate, phosphate, sulfate and silicate present in the particles of 2,4,6-tris(2,4,6-tribromophenoxy)-1,3,5-triazine. The flame retardant composition is produced by reacting an alkali metal salt of 2,4,6-tribromophenol and cyanuric chloride in the presence of said water-insoluble polyvalent metal compound.
摘要:
A process for preparing halogen-substituted aryl phosphonates represented by formula (I): wherein each Hal independently represents halogen; k is 1 or 2; n is an integer between 1 and 5, inclusive; m is an integer between 1 and 3, inclusive; and R is a straight or branched C1-C5 alkyl group which may be optionally substituted with one or more halogen atoms, which process comprises reacting under heating a compound represented by the following formula: wherein X is a leaving group, with trialkyl phosphite of the formula (RO)3P, wherein the product of Formula I is produced and maintained in a liquid form and functions as an indigenous reaction liquid medium for suspending or dissolving the reactants, wherein the temperature of the reaction mixture is not less than the melting temperature of said compound of Formula I during at least a portion of the reaction time, and recovering the product of Formula I in a liquid form.