| 摘要 |
A fatty acid ester resin containing free carboxyl groups is obtained by reacting at most 65% of the carboxyl groups of a poly-carboxylic acid or intramolecular anhydride thereof with a hydroxy-containing fatty acid ester of an aromatic compound having a plurality of hydroxyl functions, either as hydroxy groups or as epoxy groups, and no polyester group. Preferred hydroxy-containing fatty acid esters are partial fatty acid esters of styrene-allyl alcohol copolymers, and partial fatty acid esters of epoxy resins, e.g. partial fatty acid esters of polyglycidyl-polyhydroxy - ethers of polyhydric phenols. The polyhydric phenol may be bisphenol A which may be reacted with epichlorohydrin to form the epoxy resin. In the examples, linseed oil fatty acid and coconut oil fatty acid are the fatty acids employed and the polycarboxylic acids or anhydrides employed are phthalic, maleic and trimellitic anhydrides and itaconic and succinic acids. A binding agent, dilutable with water, may be prepared by neutralizing at least 60% of the free carboxyl groups of the fatty acid ester resin, for instance with aqueous solutions of sodium hydroxide, ammonia, 2-amino-1 butanol, tri-ethylamine, triethanol amine or morpholine. To increase the solubility a lyotropically active agent, e.g. butanol, pentanol or butoxyethanol, may be added. The binding compositions may be used as such or mixed with other known binder compositions. |
