| 摘要 |
<p>1521248 Modified air-drying alkyd resins HOECHST AG 25 April 1977 [28 April 1976] 17011/77 Heading C3P Modified air-drying alkyd resins are prepared by reacting an alkyd derived from (1) a polycarboxylic acid, (2) a polyhydric alcohol and (3) a monocarboxylic acid having at least 7 C atoms with (4) a copolymer of dicyclopentadiene or alkyl derivative thereof with an unsaturated carboxylic acid or derivative thereof or an unsaturated monohydric alcohol, in one step or by reacting (4) with a preformed alkyd of (1)-(3). The copolymer may contain minor proportions of other monomers, and the alkyd may also incorporate colophony and/or a phenolic resin. Examples describe alkyd resins derived from (1) phthalic acid and/or maleic anhydride, (2) glycerol or pentaerythritol, (3) tall oil fatty acid, linoleic acid, linseed oil, wood oil or soya fatty acid, optionally with benzoic acid, and (4) copolymers of dicyclopentadiene with maleic anhydride, fumaric acid or allyl alcohol. The products may be used in paints.</p> |
