Powder thermosetting compositions for preparing coatings...

C - Chemistry – Metallurgy – 09 – D

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C09D 167/00 (2006.01) C09D 5/03 (2006.01)

Patent

CA 2315331

The invention concerns powder thermosetting coating compositions comprising (a) an amorphous polyester containing carboxyl groups, rich in isophthalic acid and neopentylglycol, optionally branched with a polycarboxylic acid or a polyol containing at least three functional groups; (b) a semicrystalline polyester containing carboxyl groups prepared from one or several saturated aliphatic dicarboxylic acids with linear chain, and from a saturated aliphatic diol with linear or cyclic chain optionally branched with a polycarboxylic acid or with a polyol containing at least three functional groups, and having a melting point (Tm) of at least 40 ·C and an acid value of 5 to 50 mg of KOH/g, and (c) a cross-linking agent. Said compositions are useful for preparing powder paints and varnishes providing excellent quality coatings whereof the brilliance, measured at an angle of 60·, according to the ASTM D 523 standard is always less than 50 %, that is half-gloss or matt coatings.

Compositions de revêtement thermodurcissables en poudre comprenant (a) un polyester amorphe contenant des groupes carboxyle, riche en acide isophtalique et en néopentylglycol, éventuellement ramifié par un acide polycarboxylique ou par un polyol contenant au moins 3 groupes fonctionnels; (b) un polyester semi- cristallin contenant des groupes carboxyle préparé à partir d'un ou plusieurs acides dicarboxyliques aliphatiques saturés à chaîne linéaire, et d'un diol aliphatique saturé à chaîne linéaire ou cyclique éventuellement ramifié par un acide polycarboxylique ou par un polyol contenant au moins 3 groupes fonctionnels, et ayant un point de fusion (Tm) d'au moins 40 ~C et un indice d'acide de 5 à 50 mg de KOH/g, et (c) un agent de réticulation. Ces compositions sont utiles pour la préparation de peintures et vernis en poudre fournissant des revêtements d'excellente qualité dont la brillance, mesurée sous un angle de 60~, selon la norme ASTM D 523 est toujours inférieure à 50 %, c'est-à-dire des revêtements satinés ou mats.

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