Abstract: Corrosion inhibiting compositions for ferrous and non-ferrous metal surfaces comprise one or more crystalline polyphosphates, e.g. a strontium tripolyphosphate. The compositions have particular application in the preparation of corrosion inhibiting paint compositions. A method of preparation of the polyphosphate materials is described.

Abstract: An aqueous water-dilutable composition for use as a cathodic coating material is prepared by partially epoxidizing a liquid polydiene, all or a major proportion of which is derived from a 1,4-conjugated diene, such as butediene, aminating the epoxidized polydiene at a temperature of at least 120.degree. C. and, optionally in the presence of an organic hydroxy-group-containing catalyst, with at least polyamine reactant which contains not more than one primary amino group and/or at least one secondary amine group with the or any remaining amine group(s) being selected from secondary and tertiary amine groups and thereafter partially neutralizing the aminated polymeric material with acid to yield a water-dilutable material containing residual unsaturation.