Alkyd for pigment paste
AssigneeAkzo Nobel Coatings International B.V.
InventorsKarel Hindrik Van Streun, Eric Harry Jacobus Rijlaarsdam
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Abstract
The embodiments herein provide a solvent borne pigment paste comprising an alkyd, where the alkyd is obtainable by a process including the steps of a. producing an OH-functional alkyd from a non-drying oil or fatty acid, one or more polyols, and a first anhydride; where the non-drying oil or fatty acid has an iodine number ≥115; b. esterification of the OH-functional alkyd with trimellitic anhydride (TMA), where at least 80% of the esterified TMA residues has two free carboxylic groups. In some embodiments, at least 85%, at least 90%, or at least 98% of the esterified TMA residues has two free carboxylic groups.
Claims19
A solvent borne pigment paste comprising an alkyd and one or more iron oxide pigments
- wherein the alkyd is obtainable by a process comprising the steps of
- a. producing an OH-functional alkyd from a non-drying oil or a fatty acid, one or more polyols, and a first anhydride;
- wherein the non-drying oil or fatty acid has an iodine number ≤100 and >15 I2/100 g;
- b. esterification of the OH-functional alkyd with trimellitic anhydride (TMA) at a temperature ≤220° C. to obtain an alkyd with esterified TMA residues, wherein at least 80% of the esterified TMA residues has two free carboxylic groups,
- wherein an acid value of the alkyd is between 15 and 30 mg KOH/g, and wherein the iodine number is determined according to ISO 3961 and the acid value is determined according to ISO 2114.
Dependencies are inferred from the claim text.