Polymer non-aqueous dispersion, process for preparing the...

C - Chemistry – Metallurgy – 08 – F

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C08F 6/14 (2006.01) C08F 8/44 (2006.01) C08F 291/00 (2006.01) C08J 3/09 (2006.01) C09D 133/06 (2006.01) C09D 167/00 (2006.01) C08L 61/20 (2006.01)

Patent

CA 1299792

62-200,061 comb. POLYMER NON-AQUEOUS DISPERSION, PROCESS FOR PREPARING THE SAME AND COATING COMPOSITION FORMULATED THEREWITH Abstract of the Disclosure A process for preparing polymer non-aqueous dispersions to be formulated together with a binder component in coating compositions, which comprises the steps of: (1) emulsion polymerizing a hydroxy group containing .alpha.,.beta.-ethylenically unsaturated monomer, a polyfunctional .alpha.,.beta.-ethylenically unsaturated monomer and an .alpha.,.beta.-ethylenically unsaturated monomer different therefrom by using a water-soluble polymerization initiator, preferably a persulphate, in a soap free system or in the presence of an ester group containing anionic or cationic surfactant; adding an organic solvent, preferably comprising an amphipathic organic solvent, to a resultant polymer aqueous dispersion; and then adding a basic compound catalyst when the anionic surfactant is used or an acidic compound catalyst when the cationic surfactant is used, to thereby hydrolyze completely said surfactant and water-soluble polymerization initiator at a temperature not exceeding 95°C as in the condition of suspension; (2) adding an acidic or basic compound to said suspension to neutralize said basic or acidic compound catalyst: then after adding dispersion stabilizing resin, further adding an amine salt of organic acid, followed by leaving said suspension to stand to separate into organic and water layers; and isolating the organic layer from the water layer; and (3) removing residual water in the organic layer. The resultant polymer non- aqueous dispersion comprises polymer particles having a total ionic group concentration (I) less than 2x10-5 mol/g particle, a hexane tolerance (HT) from 5 to 40 exclusive and a degree of swelling in acetone (S) less than 10, and used with a binder component comprising a polyol resin and a curing agent for preparing coating compositions.

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