Albright & Wilson Limited

Gary Woodward

Keith Philip Davis

Martin P Greenhall

Peter A Hoye

Michael John Williams

Christopher John Harris

Mohsen Zakikhani

Alan Craig Smith

David Robert Walker

Adrian Charles Archer

Michael Bamber

Andrew John Taylor

Jasvir Singh Manku

The reaction of compounds of the formula:

Phosphino derivatives

Halogen-free, oligomeric or polymeric, alkylene-bridged alkyl phosphonates having the general formula ##STR1## where n is a whole number of from 1 to 20;

Alkylene-bridged alkyl phosphonates

A method for producing alkyl derivatives of phosphonic acids together with hexyl-bis�5-ethyl-2-hexyl-1,3,2-dioxaphosphorinan-5-yl)methyl!ester, P,P'dioxide as a novel product and the use of such a product as, or in connection with, a flame retardant.

Flame retardant product and process

A method for the production of azacycloalkane-2,2-diphosphonic acids of general formula; ##STR1## where n is a whole number of from 2 to 16, Y is H, an alkyl or alkenyl, a substituted alkyl, or an aryl, such that the group 'Y' remains unchanged during the reaction, by reaction of a lactam with a phosphorus trihalide in the presence of phosphorous acid and/or water, in which the reaction mixture also includes an organic amine and/or or an organic amine salt, said reaction being followed by hydrolysis of the reaction mixture and purification of the reaction product to obtain the diphosphonic acid. The method is exemplified by the preparation of azacycloheptane-2,2-diphosphonic acid, and azacyclononane-2,2-diphosphonic acid.

Substituted phosphonic acids

Unsaturated compounds which can be dissolved in aqueous based solvents, such as ethylenic or acetylenic carboxylate or alcohols with less than 10 carbon atoms, especially maleic and/or acrylic acid or propargyl alcohol, are reacted with alkali metal phosphite in aqueous solution at neutral or alkaline pH in the presence of free radical initiators such as persulphate to form threshold scale and corrosion inhibitors.

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Gary Woodward