Dulux Australia Ltd.

Other

David Vincent Gibson

Bruce Leary

Susan M Fox

Garry M McKay

John E Swalwell

A process of preparing aqueous dispersions of multi-component film-forming polymer particles, suitable for use in a cathodic electrodeposition process. The disperse particles, which may be thermoplastic or thermosetting, are derived from mixtures of pre-formed polymer and addition polymer formed in situ. The process is carried out at a pH below 10 and in the presence of a selected cationic surface active agent which stabilizes the dispersion below pH 10 but renders it unstable at a pH of 10-11.

Dispersion process and product

An aqueous dispersion of polymer particles wherein the polymer comprises both (a) polar groups selected from amine, ureido and thioureido groups, and (b) poly (alkylene oxide) chains covalently bonded to the polymer, the polymer comprising at least 0.1% by weight of (a), at least 0.2% of (b) and from 0.4-9.0% of (a)+(b). Dispersions according to the invention are useful in latex paint compositions, and these compositions exhibit very good moisture resistance properties.

Aqueous polymer dispersion

This invention relates to aqueous dispersions of synthetic polymer particles, particularly those used as film-forming media in surface coating compositions. The problem of maintaining under moist conditions the adhesion to a substrate of a film formed from a surface coating composition having such an aqueous dispersion as a film former can be substantially overcome by using a dispersion wherein the film-forming polymer comprises (a) polar groups selected from amine, ureido and thioureido groups (b) a proportion of monomer units derived from acrylamide and methacrylamide, and (c) a proportion of poly(alkylene oxide). The proportions of these components present by weight of the film-forming polymer are at least 0.3% of (a), at least 0.3% of (b), at least 0.5% of (c) and from 1.4-9.0% of (a)+(b)+(c). These aqueous polymer dispersions may be used in interior or exterior surface coatings.

Aqueous dispersion of polymers containing polar groups and amide groups

Aqueous coating compositions comprising ionizable salts of specific epoxy-amine adducts and acids of pK.sub.a value 1.5 - 6.0 are disclosed. The coatings are particularly useful in a cathodic electrodeposition process.

Process for electrocoating aqueous coating composition comprising

A convertible coating composition comprising a film-forming constituent which is a blend of (1) a low molecular weight mono or diepoxide, (b) a low molecular weight compound containing at least two reactive groups at least one of which is carboxyl and the other or others carboxyl or hydroxyl groups (c) a cross-linking agent and optionally (d) an autoxidisable fatty acid or alcohol. These coating compositions are low polluting as they may be applied by the use of only small amounts of solvents.

Autoxidisable composition

Aqueous coating composition of epoxy-amine adduct and an acid with

A liquid thermosetting coating composition wherein the film-forming component is a blend of

Liquid thermosetting coating compositions

A group of novel amphipathic copolymers of poly(ethylene glycol) acrylate or methacrylate and methyl acrylate or methacrylate is disclosed. The copolymers are especially useful as thickeners for aqueous latex paints in which the disperse particles of film-forming polymer have a diameter below 0.5 micron.

Growing community of inventors

North Bayswater, Australia

David Vincent Gibson