Dulux Australia Ltd.

Orica Australia Pty Ltd

Ici Australia Operations Proprietary Limited

Bruce Leary

David Vincent Gibson

Patrick William Houlihan

Thamala C Weerasinghe

Michelle Carey

Christopher Henry Such

Frederick J Lubbock

Iain B Cook

Geoffrey B Anderson

Karen Elsbury

Lisa Madigan

Chantel Marise

Christopher J Lyons

Susan George

David S Bignell

Algirdas Kazimieras Serelis

Elizabeth Ann Salter

Craig D Meekings

Matthew William Carr

Malcolm Leslie Dean

Clive W Graetz

Antony J Irvine

Philip John Allan Ritchie

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

The invention relates to the use of a diacyl peroxide in combination with an aromatic amine of formula (I) where R is C -C alkyl having at least one hydroxy substituent or &mdash;(CH&prime;CHR&prime;&mdash;O) H where n is 1 to 10 and each R&prime; is independently selected from H and C -C alkyl; R is C -C alkyl optionally substituted with one or more hydroxy groups, or &mdash;(CHR&prime;CHR&prime;&mdash;O) H where n&equals;1 to 10; and each R is independently selected from H and C -C alkyl; and Ar is an optionally substituted aryl group; as a redox initiating system in a process for the manufacture of polyester granules by suspension polymerisation. This invention also relates to a process for preparing solid polyester granules using such a redox initiating system.

Initiating system for solid polyester granule manufacture

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.

Water-borne soil resistant coatings

Very small (100 nanometres maximum) non-ionically-stabilised core-sheath addition polymer particles, wherein the core is addition polymer and the sheath polyoxyalkylene chains, at least a portion of which chains are bonded to the core, there being present on each core sufficient chains such that the mass ratio of core to sheath is from 98:2 to 60:40. The particles are prepared by polymerisation in aqueous media initiated at under 40.degree. C. In a preferred embodiment, a seed-feed process is used. The dispersions exhibit excellent rheological characteristics and are useful, for example, as film-formers in coating compositions.

Addition polymer particles

Very small (100 nanometers maximum) non-ionically-stabilized core-sheath addition polymer particles, wherein the core is addition polymer and the sheath polyoxylkylene chains, at least a portion of which chains are bonded to the core, there being present on each core sufficient chains such that the mass ratio of core to sheath is from 98:2 to 60:40. The particles are prepared by polymerization in aqueous media initiated at under 40.degree. C. In a preferred embodiment, a seed-feed process is used. The dispersions exhibit excellent rheological characteristics and are useful, for example, as film-formers in coating compositions.

This invention relates to stable aqueous dispersions of film-forming addition polymer. Novel aqueous dispersions comprise polymer which is a copolymer of amphipathic and non-amphipathic monomer. The amphipathic monomer has an HLB value of at least 8, the hydrophilic component thereof is non-ionic, and the lipophilic component has a molecular weight of at least 100, comprises at least one ethylenic double bond but has no acrylyl or methacrylyl structure. The polymer comprises up to 80% by weight of amphipathic monomer. The dispersions are useful as components of such compositions as surface coatings and adhesives.

Aqueous dispersions

A process of modifying the levelling characteristics of a film of a polar liquid coating composition by incorporating therein 0.5-60% by weight of an amphipathic random copolymer which comprises 5-50% of a monomer which has a chain-like structure at least 80 covalent bonds long and which is soluble in poly(ethylene oxide) of molecular weight 400, and 25-95% of a (meth)acrylate monomer which comprises a chain-like moiety of at least 10 covalent atoms long and which is not soluble in poly(ethylene oxide) of molecular weight 400. The resulting copolymer may be added to polar liquid coating compositions to give useful improvements in flow and levelling characteristics.

Levelling control of polar liquids

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 novel derivative which is an ester of trimellitic anhydride or pyromellitic dianhydride, the derivative containing carboxyl and hydroxyl groups and comprising two mono-esters per derivative molecule of diols selected from alkylene glycols and dihydroxy esters of such glycols with dicarboxylic acids. These derivatives have a minimum acid value of 40 mgm KOH per gm and when blended with a suitable cross-linking agent are useful as film-forming constituents of high-solids coating compositions.

Anhydride derivatives

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.

Polymeric thickeners

Novel derivatives of maleinized fatty acids are disclosed. The derivatives comprise mono-esters of both a selected type of diol and an alkylene oxide, they contain free carboxyl and hydroxyl groups and have acid values of 40-100 mg KOH per g. They are useful film-forming components of high-solids coating compositions.

Growing community of inventors

Red Hill, Australia

Bruce Leary