Akzo Nobel Coatings International B.v.

Imperial Chemical Industries Limited

Stephen Arthur Wheeler

Susan M Horley

Neal St John Williams

Robert David Bradley

Anthony David Woods

Simon Nicholas Emmett

Javier Perez-Amoros

Richard Barcock

Colin Pearce

Gary Jefferson

Julie Anne Horny

Katherine Mary Ledingham

Javier Peres-Amoros

An aqueous dispersion of pigmented opacifying polymer particles, the particles comprising: i. an inorganic core comprising dispersed inorganic pigment particle and a dispersant ii. a first layer of base-swellable polymer comprising acid groups encapsulating the core iii. a second layer of non-base-swellable polymer encapsulating the first layer wherein the dispersant comprises or consists of hydroxyl moieties; and carboxyl groups derived from itaconic acid.

Opacifying polymer particles

A method of preparing an aqueous dispersion of opacifying polymer particles containing inorganic pigment particles therein is disclosed. The method yields hollow polymer particles containing pigment particles therein using a non-RAFT emulsion polymerization process by free radical polymerization. The technique is much faster and simpler than known RAFT methods.

Method of making opacifying polymer particles

An aqueous coating composition having a PVC of from 78 to 88% comprising, based on the total volume solids of the dry coating unless otherwise stated: a) opacifying pigment particles comprising 

Low titianium dioxide coatings

Aqueous coating composition having a PVC from 78 to 85% and free of non-fugitive coalescing solvent, comprising, based on the total volume solids of the dry coating unless otherwise stated,

Low titanium dioxide coatings

An environmentally friendly stable aqueous optionally structured water-resistant architectural coating composition (especially a paint) containing a film-forming binder polymer composed of a starch modified by the presence of carboxylic acid or inorganic carboxylate groups and bonded (probably grafted) to chains of copolymerized mono-ethylenically unsaturated monomers (e.g. &ldquo;acrylic&rdquo;, &ldquo;vinyl&rdquo; or &ldquo;styrenic&rdquo; copolymers) permitting a stable aqueous dispersion of the binder polymer to be made which retains good water-resistance in the dried paint. The modified starch allows paints to be made with less dependence on materials obtained from non-renewable resources whilst retaining a low water-sensitivity.

Environmentally friendly aqueous architectural coating compositions

An environmentally friendly stable aqueous optionally structured water-resistant architectural coating composition (especially a paint) containing a film-forming binder polymer composed of a starch modified by the presence of carboxylic acid or inorganic carboxylate groups and bonded (probably grafted) to chains of copolymerized mono-ethylenically unsaturated monomers (e.g. &ldquo;acrylic&rdquo;, &ldquo;vinyl&rdquo; or &ldquo;styrenic&rdquo; copolymers) permitting a stable aqueous dispersion of the binder polymer to be made which retains good water-resistance in the dried paint. The modified starch allows paints to be made with less dependence on materials obtained from non-renewable resources while retaining a low water-sensitivity.

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Slough, United Kingdom

Stephen Arthur Wheeler