| 摘要 |
A process for preparing a water-soluble alkyd resin, which comprises (1) reacting (i) at least one of (a) a 1,2-epoxyalkane containing 6 to 28 carbon atoms, (b) a straight-chain internal epoxyalkane containing 6 to 20 carbon atoms, (c) a mixture of one or more of the 1,2-epoxyalkane (a) and/or the internal epoxyalkane (b), or (d) a mixture of one or more of the 1,2-epoxyalkane (a) and/or the internal epoxyalkane (b) and an unsaturated fatty acid containing 12 to 18 carbon atoms in a molar ratio of about 4:1 to about 2:1 of the 1,2-epoxyalkane (a) and/or the internal epoxyalkane (b) to the unsaturated fatty acid; with (ii) at least one of (a') an aromatic carboxyl compound selected from the group consisting essentially of phthalic anhydride, isophthalic acid, terephthalic acid, an ester of isophthalic acid and an ester of terephthalic acid, (b') a mixture of two or more of the aromatic carboxyl compounds (a'), or (c') a mixture of one or more of the aromatic carboxylic compounds (a') and an aliphatic dicarboxylic acid having 3 or more carbon atoms or an anhydride thereof; and (iii) a polyhydric alcohol containing 2 to 10 carbon atoms to form a polyester containing hydroxyl groups and having an acid value of about 5 or less, a hydroxyl value of about 40 to about 200 and an average molecular weight of about 600 to about 2,500; (2) reacting the hydroxyl groups of the polyester with an aromatic polycarboxylic acid anhydride to adjust the acid value of the polyester to about 25 to about 80 and form a carboxyl group-containing alkyd resin; and (3) neutralizing the carboxyl group-containing alkyd resin with a base.
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