Pigment paste

C - Chemistry – Metallurgy – 09 – D

Patent

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Details

C09D 17/00 (2006.01) C09B 67/00 (2006.01) C09B 67/20 (2006.01) C09D 167/08 (2006.01)

Patent

CA 2448922

Pigment paste for tinting a coating composition, the pigment paste comprising at least one branched alkyd having a viscosity below5 Pa.s, preferably below 3.5 Pa.s, at 23~C at a shear rate of 100s-1, pigments, and 2 - 25% of an aromate-free solvent. The number average molecular weight Mn of the alkyd is between 2,000 and 2,400 g/mole. The degree of branching of the alkyd is at least 0.35 and preferably below 0.42. The oil length is between 76 and 84. The VOC is below 250 g/l.

La présente invention se rapporte à une pâte pigmentaire destinée à colorer une composition de revêtement. Cette pâte pigmentaire comprend au moins un alkyde ramifié ayant une viscosité inférieure à 5 Pa.s, de préférence inférieure à 3,5 Pa.s, à 23 ·C et pour un taux de cisaillement de 100 s ?-1¿, des pigments et 2 à 25 % d'un solvant ne contenant pas d'arôme. Le poids moléculaire moyen en nombre Mn de cet alkyde est compris entre 2000 et 2400 g/mole. Le degré de ramification de cet alkyde est d'au moins 0,35 et de préférence inférieur à 0,42. Le rapport huile/résine est compris entre 76 et 84. Le contenu en composés organiques volatils (VOC) est inférieur à 250 g/l.

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