Albright & Wilson Limited

Keith Philip Davis

Gary Woodward

Robert E Talbot

Martin P Greenhall

Peter A Hoye

Michael John Williams

Alan Craig Smith

David Robert Walker

Mohsen Zakikhani

Kenneth G Cooper

Peter David Hasling

Mark A Saunders

The reaction of compounds of the formula:

Phosphino derivatives

Phosphonic acid polymers are prepared from di- or polyphosphonic acids having one or more unsaturated C.dbd.C bonds (e.g. vinylidene-1,1-diphosphonic acid), either as homopolymers or as higher polymers with at least one further compound having unsaturated C.dbd.C bonds (e.g. acrylic acid). The polymers can be used as, or in connection with, flame-retardants, corrosion inhibitors, coatings, cements and ion exchange resins.

Phosphonic acid polymers

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.

Water treatment agent

Solutions of organophosphorus biocides which also contain dissolved oxygen are deactivated by adding a catalytic amount of activated carbon.

Deactivation of phosphonium biocides

The growth of microbiological contaminants in industrial cooling and process waters and in aqueous based products, susceptible to microbiological spoilage on storage, is inhibited by the presence of a phosphorus compound having a hydroxy alkyl group directly attached to the phosphorus atom, such as tetrakis hydroxy methyl phosphonium sulphate.

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Keith Philip Davis