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US 4,404,361 AGranted
Flame retardant for polymeric compositions
AssigneeSaytech, Inc.
InventorHenry J. Barda
Life of this patent
Estimating the term…
Abstract
An additive flame retardant bisimide containing halogen atoms and ammonium acid tetrahalophthalate, e.g. N,N'-bis(2-ethylene tetrabromophthalimide) ammonium acid tetrabromophthalate. These compounds are useful in a variety of polymeric compositions and demonstrate increased thermal stability. They also foam on decomposition with the evolution of gas thus readily lending themselves to the preparation of flame retardant coatings.
Claims13
An additive flame retardant halogen-containing bisimide having the formula:
- ##STR5## wherein Z is a hydrocarbon group having the valence n+2 and is selected from the group consisting of benzene groups, naphthalene groups and alicyclic hydrocarbon groups containing 5-10 carbon atoms, X is selected from the group consisting of bromine and chlorine, n is an integer from 1-6, R, R' and R" are divalent hydrocarbon groups independently selected from the group consisting of aliphatic hydrocarbon groups and alicyclic hydrocarbon groups containing 2-12 carbon atoms, y is an integer from 1-50 and t is an integer from 0-49.
Dependencies are inferred from the claim text.