Compositions are provided which contain (a) one or more polysiloxanes comprising at least one reactive functional group; a plurality of particles; and, optionally, one or more curing agents comprising at least one functional group that is reactive with any reactive functional group of polysiloxane (a). Additionally, a process for applying the multi-component composite coatings described above to a substrate and coated substrates are provided. A process for preparing the coating compositions also is provided. The multi-component composite coating compositions of the invention provide highly scratch resistant color-plus-clearcoatings capable of retaining scratch resistance after weathering.

Coating compositions having improved scratch resistance, coated substrates and methods related thereto

A powder coating composition of the invention comprises a film-forming polymeric component having a d(v,50) in the range of from 25 to 50 microns or a d(v,70) in the range of from 25 to 70 microns, which composition incorporates by dry-blending at least one appearance-modifying additive component and a further component comprising wax-coated silica or consisting of alumina together with aluminium hydroxide. The appearance-modifying additive may be a gloss-reducing component, a texturing component, a metallic or mica component, a colouring pigment, or a further film-forming polymeric material compatible with the first film-forming polymeric material and differing in colouration therefrom, and the further additive may be alumina together with aluminium hydroxide or wax-coated silica together with alumina and/or with aluminium hydroxide or wax-coated silica. Preferably, no more than 70 % by volume of the particles in the film-forming polymeric material are less than 50 microns. A kit of the invention comprises the individual additive components prior to mixing. The kit allows for the flexibl production of a variety of finishes from a gloss powder coating composition, for example a matt or textured or metallic or sparkle finish or a matt textured finish, a matt metallic finish, an antique finish or a contrast texture or metallic sparkle finish.

Powder coating compositions

Method of making a stable aqueous dispersion of polymeric material comprising: (A) producing an NCO-terminated polyurethane prepolymer in the presence of inert liquid polymerizable ethylenically unsaturated monomer material, (B) dispersing the product from A in water, (C) chain-extending the prepolymer in the resulting aqueous dispersion, and (D) subjecting the aqueous dispersion from C to vinyl addition polymerization conditions to polymerize said monomer material in situ, the weight ratio of chain extended polyurethane to said monomer material being about 9:1 to about 1:9., the resulting aqueous dispersions, and their use for making films, sheets and other products.

Aqueous polyurethane - polyolefin compositions

Cured coatings having particles at a surface region of the cured coating are provided. Also provided are multi-component composite coatings which include a cured basecoat deposited from a pigmented coating composition and a cured topcoat deposited from a topcoating composition. The multi-component composite coatings of the invention provide highly scratch resistant color-plus-clearcoatings capable of retaining scratch resistance after weathering.

Cured coatings having improved scratch resistance, coated substrates and methods thereto

The present invention relates to a stable, aqueous dispersion of polyurethane-ureas wherein said polyurethane-ureas contain (i) about 10 to 120 milliequivalents per 100 grams of polyurethane-urea of chemically incorporated anionic groups, and (ii) up to about 10% by weight, based on the weight of the polyurethane-urea, of lateral and/or terminal hydrophilic chains containing ethylene oxide units, wherein the counterions of the anionic groups are a mixture of volatile and non-volatile cations in an equivalent ratio of about 1:4 to 4:1. The present invention is also directed to the coatings and films prepared from these dispersions.

Stable, aqueous dispersions of polyurethane-ureas

A water-diluted, ungelled, non-sedimenting polyurethane and a process for preparing such a polyurethane in an aqueous medium is disclosed. High molecular weight thermoplastic products are obtained by chain extending in aqueous medium an NCO polymer having a salt group equivalent weight of 6000 or less and substantially free of reactive hydrogen. The average functionality and equivalent ratio of the polyisocyanate and active hydrogen-containing materials used in making the NCO polymer, as well as the functionality of the chain extender, are carefully controlled so as to get high molecular weight ungelled products. Thermosetting compositions can be made by adding curing agent to the chain extended material. Curing agents can also be incorporated into the polymer molecule either in the making of the partially reacted NCO-containing prepolymer or by further reaction with the partially reacted NCO-containing prepolymer. The water-dispersed polyurethanes of the present invention are excellent film formers, capable of making coatings with a wide spectrum of desirable properties. In addition, they can be added to other water-compatible compositions to improve flexibility, hardness, drying and other coating properties.

Water-reduced urethane coating compositions

The potlife of an ambient temperature, moisture-curable coating composition comprising an acrylic-silane interpolymer and a cure-accelerating catalyst is increased by the addition to the composition of from about 0.5 percent to about 15 percent by weight of interpolymer solids of a monomeric hydrolytically reactive organo-silicon compound represented by the structural formula: X.sub.n Si(OR).sub.4-n wherein X is an organic radical having from 1 to 12 carbon atoms, R is methyl, ethyl, 2-methoxyethyl, 2-ethoxyethyl, or an acyl group containing 5 or less carbon atoms and n is 0, 1 or 2.

Ambient temperature, moisture-curable acrylic-silane coating compositions having improved potlife

A method of cationic electrodeposition, electrocoated articles and novel electrocoating compositions are disclosed. The compositions comprise a cationic resin containing blocked isocyanate functionality and are capable of being electrodeposited over rough steel and producing extremely smooth films upon curing.

Cationic coating compositions for electrodeposition over rough steel

Cationic electrocoating compositions comprising a cationic electrodepositable resin and particular hydroxyl-free, alkylated polyethers dispersed in an aqueous medium are disclosed. Due to the presence of the polyethers, the compositions electrodeposit at high film builds with good smoothness. However, the polyethers do not result in detrimental effects with regard to the properties of the compositions such as rupture voltage and corrosion resistance of the resultant electrodeposited film. Also, the particular polyethers readily incorporate in the electrodeposition bath, are non-volatile and do not significantly build up in the electrodeposition bath during the electrodeposition process.

Cationic electrocoating compositions

Compositions useful as sealing primers for elastomeric coatings comprise (A) the reaction product of a polyurethane polyol and a polycarboxylic acid or acid anhydride, and (B) an aminoplast resin. When used as primers, the compositions of the instant invention increase the durability, gloss retention and adhesion of elastomeric coatings. Such primers are particularly useful on resilient and rubbery substrates such as EPDM rubber, foam rubber, polyurethane foam and vinyl foam.

Roger Louis Scriven

Papers

Water-reduced urethane coating compositions

Ambient temperature, moisture-curable acrylic-silane coating compositions having improved potlife

Cationic coating compositions for electrodeposition over rough steel

Cationic electrocoating compositions

Sealer-primer for elastomeric coatings