Abstract:
Flame retardant polymer compositions comprising certain polymers, a flame retardant material obtained by heating certain phosphonic acid sate at temperatures over 200°C and certain clays or metal compounds such as select metal borates, oxides, hydroxides, oxide hydroxides etc., are readily processed at elevated temperatures and under high stress conditions whereas similar compositions without the clays or metal compounds of the invention are prone to decomposition. For example, polyamide compositions comprising the flame retardant material obtained by heating certain phosphonic acid salts at temperatures over 200°C, hydrotalcite clays, and/or borates, oxides, hydroxides, oxide hydroxides of zinc or calcium, are highly stable to thermal processing under strenuous conditions such as high temperature extrusion.
Abstract:
A halogenated phenyl ether flame retardant is described having the general formula (I): wherein each X is independently C1 or Br, n is an integer of from 0 to 12, and each p is independently an integer of 1 to 4, provided that, when each X is C1, the total amount halogen in the ether is from about 50 to about 65 wt% and when each X is Br, the total amount halogen in the ether is from at least 70 wt % to about 79 wt% and wherein from about 30% to about 80%, for example from about 35% to about 75% of the halogenated ethers are fully halogenated the remainder being partially halogenated. In many embodiments, mixtures of compounds of formula I with different values of n are present. The present flame retardant provides superior mechanical properties when incorporated into a polymer than similar flame retardants which contain a higher amount of fully halogenated species.
Abstract:
Resin compositions, e.g., epoxy resin compositions, comprising flame retardant materials obtained by heating phosphonic acid salts at temperatures above 200° C., have excellent properties and exhibit manageable curing behavior. Laminates, composites, molded articles and the like, which have excellent flame retardant properties and physical characteristics, are readily prepared from the resin compositions of the invention.