Albright & Wilson Limited

Peter A Hoye

Gary Woodward

Keith Philip Davis

Martin P Greenhall

Michael John Williams

Harold Coates

James W Ellis

Anthony James Wilkins

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

Olefins can be induced to react with phosphines at ambient temperature and pressure to produce organophosphines by free-radical addition. Suitable olefins include C.sub.1 to C.sub.4 alpha-olefins, cyclic olefins, polycycloalkenyl species, allyl alcohol and esters of vinyl phosphonic acid.

Process for preparing organophosphines

Halogenated vinyl resins such as poly(vinyl chloride) (P.V.C.) are stabilized against degradation by the addition of stabilizers comprising specified monoorganotin sulfur-containing compounds, for example the reaction product of a mono-organotin tris mercapto carboxylic acid ester and a di-organotin sulfide in combination with an alkyl, aryl or mixed alkyl-aryl ester of phosphorous acid. Preferably the stabilizers also include a hindered phenol.

Stabilization of polymeric compositions

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Stourbridge, United Kingdom

Peter A Hoye