Coating composition comprising a vinyl modified alkyd resin

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 167/08 (2006.01) C08F 283/01 (2006.01) C08F 299/04 (2006.01) C08G 63/48 (2006.01) C09D 151/08 (2006.01)

Patent

CA 2567723

Solvent borne coating composition comprising an alkyd having at least 20 % by weight of vinylic building blocks and having an oil length below 65 %. The weight ratio non-vinylic : vinylic groups is between 1 : 1 and 4 : 1, preferably between 1.5 : 1 and 3 : 1. The vinylic groups include styrene and (meth)acrylate groups. The ratio of styrene : (meth)acrylate groups is between 0.5 : 1 and 4 : 1, preferably between 1.5 : 1 and 3: 1. The vinylic groups show low polarity. The Mw is below 10,000. The oil length is above 45 %. The alkyd according to the invention allows formulation of solvent borne coatings a volatile organic content below 300 g / I.

L'invention porte sur un composition de revêtement en suspension dans un solvant contenant un alkyde possédant au moins 20 % en poids d'éléments constitutifs vinyliques et présentant un rapport huile/résine inférieur à 65 %. Le rapport en poids groupes non vinyliques : vinyliques est compris entre 1: 1 et 4: 1, de préférence entre 1,5: 1 et 3: 1. Les groupes vinyliques contiennent des groupes de styrène et de (méth)acrylate. Le rapport des groupes styrène: (méth)acrylate est compris entre 0,5: 1 et 4: 1, de préférence entre 1,5: 1 et 3: 1. Les groupes vinyliques présentent une faible polarité. La masse moléculaire relative est inférieure à 10000. Le rapport huile/résine est supérieur à 45 %. L'alkyde de l'invention permet à la formulation de revêtements en suspension dans un solvant de présenter une teneur organique volatile inférieure à 300 g / I.

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