Arkema France

Jerome Mazajczyk

Alain F Riondel

Alain Boone

Gregory A Delmas

Patricia Beurdeley

Michael Kurczak

Claire Chambat

Cecile Chaineau

Emile Harlay

The present invention relates to aqueous alkyd resin dispersions comprising a) a short oil alkyd resin comprising, in its fatty acid component a1), at least one polyunsaturated fatty monoacid a11) having at least two unsaturations per molecule and comprising at least 35% by weight of a monoacid a111) having conjugated unsaturations, the content by weight of said fatty monoacid a111), with respect to said alkyd resin, being at least 5%, preferably from 5% to 40% and more preferably from 5% to 35%, and b) at least one anionic phosphate surfactant. The invention also covers a preparation process and its use in decorative coatings. The coatings based on these aqueous dispersions exhibit improved performance qualities in resistance to blocking and yellowing, in development of hardness and in gloss.

Aqueous alkyd dispersions with improved application performances in terms of resistance to blocking and yellowing, hardness development and shine

The invention relates to aqueous coating compositions based on an aqueous polymer dispersion as binder, having high performance levels of resistance to stains and dirt without specialist functional monomers. Said aqueous polymer dispersion having an MFFT between 0 and 50&#xb0; C. comprises polymer particles obtained by emulsion polymerization in at least two steps with at least two polymer phases P1 and P2, P1 representing from 75 to 90% by weight of P1+P2 having a Fox Tg1 from 0 to 40&#xb0; C. and P2 having a Fox Tg2 from 0 to 40&#xb0; C., said polymer P2 representing from 10 to 25% by weight of the sum of polymers P1 and P2 and having a calculated Hansch parameter &#x3c;2.0 and at least one ethylenically unsaturated monomer bearing an acetoacetoxy and/or amine or ureido functional group, said acetoacetoxy and/or amine or ureido functional group being borne by the external surface of P2 phase.

Coatings having improved resistance to stains and dirt

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La Croix Saint Ouen, France

Jerome Mazajczyk