| 摘要 |
The hardness of a polymer drying oil is improved by first reacting the oil at between 50 DEG and 250 DEG C. with a reagent selected from maleic, fumaric, thioglycolic, thiosalicylic, mercaptophthalic, itaconic, mesaconic, citraconic and acrylic acids and esters and anhydrides thereof, and then reacting the product with an organic compound containing a hydroxyl group and either a primary or secondary amino group. Specified polymers are those of butadiene, isoprene, dimethyl butadiene, piperylene, methyl pentadiene and their copolymers with each other or with minor amounts, e.g. 5-40 per cent of styrene, para-methyl styrene, dimethyl or diethyl styrene, acrylonitrile, methacrylonitrile, methyl acrylate or methacrylate, vinyl isobutyl ether, methyl vinyl ketone, and isopropenyl methyl ketone. The polymerization may take place in the presence of either a peroxide catalyst, e.g. benzoyl peroxide or cumene hydroperoxide, or metallic sodium while ether modifiers, aliphatic alcohols, and mineral spirit diluents may be present. The second reagent may be ethanolamine; diethanolamine; 2-amino - 2 - methylpropane - diol - 1,3; 2-amino- 2 - (hydroxymethyl) - propane diol - 1 - 3; aminobenzyl alcohol; aminoxylyl alcohol or amino-diethylene glycol, and may also contain sulphur. The final product may be further treated with mono-, di- or tri-chloroacetic acid or trifluoroacetic acid, glacial acetic acid or oilsoluble sulphonic acids. The products form hard alms.
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