Ciba Specialty Chemicals Corporation

Rangarajan Srinivasan

Douglas Wayne Horsey

Ramanathan Ravichandran

Stephen Mark Andrews

Anunay Gupta

Joseph Stephen Puglisi

Leonard Harris Davis

Paul Shields

Robert Leo Gray

Darrell David Dyas, Jr

Bruce Vincent Hein

James Peter Galbo

Peter Solera

Henry C Grace

Polyolefins, especially polypropylene, can be made flame retardant by the incorporation therein of a synergistic mixture of a selected hindered amine substituted by an alkoxy, cycloalkoxy or hydroxyalkoxy moiety and a selected organic or inorganic brominated and/or phosphorus containing flame retardant, such as ammonium polyphosphate or decabromodiphenyl oxide wherein the amount of organic or inorganic flame retardant required to achieve an acceptable level of flame retardancy is significantly reduced compared to that needed when the hindered amine is not present.

Flame retardant compositions

Polyolefins, especially polypropylene, can be made flame retardant by the incorporation therein of a synergistic mixture of a selected hindered amine substituted by an alkoxy, cydoalkoxy or hydroxyalkoxy moiety and a selected organic or inorganic brominated and/or phosphorus containing flame retardant, such as ammonium polyphosphate or decabromodiphenyl oxide wherein the amount of organic or inorganic flame retardant required to achieve an acceptable level of flame retardancy is significantly reduced compared to that needed when the hindered amine is not present.

A mixture of the compounds identified in the title, their pure isomers and alkane-bridged derivatives are particularly effective in stabilizing polymer compositions, particularly polyolefin compositions.

N,N',N''-tris{2,4-bis�Hydrocarbyloxy-2,2,6,6-tetra-

Growing community of inventors

Tarrytown, NY, United States of America

Rangarajan Srinivasan