Lanxess Solutions US Inc.

Lanxess Corporation

Zachary D Stockdale

Larry D Timberlake

Mark V Hanson

William Ray Fielding

Subramaniam Narayan

William R Fielding

Matthew S Burge

Subramanian Narayan

Flame retardant polymer compositions comprising certain thermally stable salts of pyrophosphonic acid as flame retardant materials, which flame retardant materials comprise one or more than one metals, are prepared and have excellent flame retardant activity.

Salts of pyrophosphonic acid as flame retardants

Flame retardants produced by heating certain phosphonic acid salts at temperatures over 200&#xb0; C. are readily compounded into high temperature polyamides that are processed at temperatures above 270&#xb0; C. to provide flame retardant, high temperature polyamide compositions.

Halogen free high temperature polyamide compositions comprising phosphorus containing flame retardants

Flame retardant polymer compositions comprising certain polymers, a flame retardant material obtained by heating certain phosphonic acid salts at temperatures over 200&#xb0; 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&#xb0; 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.

Process stabilization of polymer compositions comprising phosphorous containing flame retardants

Flame retardant polymer compositions with excellent processing stability and flame retardant activity are obtained by incorporating into the polymer a flame retardant obtained by heating certain phosphonic acid salts at temperatures of 200&#xb0; C. or higher and as flame retardant synergist melam or a melam derivative, which compositions are more readily processed under certain harsh conditions than similar compositions comprising similar synergists such as melem, melon and the like.

Flame retardant polymer compositions comprising heat treated phosphorus compounds and melam

Certain phosphonic acid salts heated at temperatures over 200&#xb0; C. generate thermally stable, highly efficient flame retardant materials well suited for use as flame retardant additives in polymers. Various methods for preparing flame retardant materials from more than one phosphonic acid salts are provided, wherein each method can generate different flame retardant materials from the same mixture of starting phosphonic acids. The flame retardants of the invention can be used as the sole flame retardant in a composition or in combination with other flame retardants, synergists or adjuvants.

Phosphorus containing flame retardants

Certain phosphonic acid salts heated at temperatures over 200&#xb0; C. generate thermally stable, highly efficient flame retardant materials well suited for use as flame retardant additives in polymers. The flame retardants of the invention can be used as the sole flame retardant in a composition or in combination with other flame retardants, synergists or adjuvants.

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West Lafayette, IN, United States of America

Zachary D Stockdale