Brominated diphenylalkane products and processes
AssigneeGreat Lakes Chemical Corporation
InventorsArthur G. Mack, Rastko I. Mamuzic, David C. Sanders, Richard S. Rose, Mary G. Harscher
Life of this patent
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Abstract
Described are processes for preparing brominated diphenylalkane products which are far whiter than prior known brominated diphenylalkane products. The resultant white brominated diphenylalkane products also form a part of the present invention, as do formulations incorporating the white brominated diphenylalkane products, and articles prepared therefrom.
Claims39
A process for improving the color of a solid, brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge and an average bromine number of about 6 or more, comprising:
- contacting the brominated diphenylalkane product with an aromatic solvent at a temperature above about 175.degree. C. to achieve dissolution of the brominated diphenylalkane product in the aromatic solvent;
- cooling the resulting solution to precipitate the brominated diphenylalkane product having an improved color;
- and
- recovering the brominated diphenylalkane product having a Yellowness Index (ASTM D 1925-70) less than 10.
A solid, particulate flame retardant brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge, having an average bromine number of at least about 6 and a Yellowness Index (ASTM D 1925-70) of about 0 to less than 5.
A solid, particulate flame retardant brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge, prepared by the bromination of a corresponding diphenylalkane in the presence of an iron catalyst to obtain an average bromine number of at least about 6 and being essentially free from alkylene-bridge brominated diphenylalkane.
A flame retarded formulation, comprising:
- a flammable macromolecular material;
- and
- a flame retarding amount of a solid, particulate flame retardant brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge, having an average bromine number of at least about 6 and a Yellowness Index (ASTM D 1925-70) of about 0 to less than 5.
A flame retarded formulation, comprising:
- a flammable macromolecular material;
- and
- a flame retarding amount of a solid, particulate flame retardant brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge, prepared by the bromination of a corresponding diphenylalkane in the presence of an iron catalyst to obtain an average bromine number of at least about 6 and being essentially free from alkylene-bridge brominated diphenylalkane.
A solid, particulate flame retardant brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge, having an average bromine number of at least about 9 and exhibiting substantially no decomposition upon melting.
A solid, particulate flame retardant brominated diphenylalkane product having 1 to about 10 carbon atoms in its alkylene bridge, having an average bromine number of at least about 9 and exhibiting substantially no evolution of HBr when heated to a temperature of 330.degree. C.
A process for preparing a flame retardant brominated diphenylalkane product being essentially free from bromination on its alkylene bridge, comprising:
- brominating a diphenylalkane having 1 to about 10 carbon atoms in its alkylene bridge in the presence of an iron bromination catalyst so as to produce a brominated diphenylalkane product having an average bromine number of at least about 6 and which is essentially free from alkylene-bridge bromination.
Dependencies are inferred from the claim text.