Orica Australia Pty Ltd

Thamala C Weerasinghe

Bruce Leary

Patrick William Houlihan

Michelle Carey

Lisa Madigan

Chantel Marise

Karen Elsbury

Susan George

Christopher Henry Such

Matthew William Carr

Aqueous coating compositions are described where the binder includes an anionically stabilized polymeric dispersion. The monomers used to prepare the dispersion are acrylic acid and methacrylic acid as a carboxylic monomer and styrene, alpha methyl styrene or vinyl toluene as a hydrophobic high Tg aromatic monomer and an alkyl acrylate ester as a low Tg monomer. The relative weight proportions of the monomers are required to satisfy a formula. Blends of high and low Tg dispersions are also described. Paints formulated with the binders exhibit an excellent balance of stain resistance, tint strength and viscosity stability.

Stain resistant water-borne coating composition

This invention relates to a process for preparing an aqueous dispersion of water insoluble polymer particles comprising: a) preparing by polymerisation an aqueous dispersion of water insoluble particles of a heteropolymer including monomeric units of a reactive amphiphile having a cloud point and monomeric units of a hydrophilic monomer, said polymerisation being conducted in the presence of a stabilising agent and the reactive amphiphile and at a temperature above the cloud point of said amphiphile, and b) cooling said aqueous dispersion to a temperature below the cloud point of the reactive amphiphile such that the viscosity of the aqueous dispersion increases. The invention also relates to aqueous dispersions of water insoluble heteropolymer particles which incorporate units of reactive amphiphile.

Aqueous polymer dispersion

Aqueous coating composition are described wherein the binder includes an anionically stabilized addition polymerized dispersion of a polymer. The monomers used to prepare the dispersion are acrylic cid and methyacrylic acid, as carboxylic monomers and styrene, alpha-methyl styrene or vinyl toluene as a hydrophobic high T aromatic monomer. Acrylate ester is used as a low T monomer. The relative weight proportions of the monomers are required to satisfy the designated formula. Blends of high and low T dispersions are also provided. Pains formulated with the binders of present invention exhibit excellent balance of stain resistance, tint strength and viscosity stability.

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Narre Warren, Australia

Thamala C Weerasinghe