| 摘要 |
A dihydric alcohol such as propylene, diethylene or tetramethylene glycols, an alcohol having three or more hydroxyl groups in the molecule, a dibasic aliphatic acid such as malic, maleic, fumaric, glutaric, adipic, pimelic or suberic acids, a polybasic acid other than a dibasic aliphatic acid such as phthalic, citric or tartaric acids, a vegetable oil such as linseed oil, perilla oil or soya bean oil and a natural resin such as dammar, kauri or copal, or resinic acid derived therefrom are condensed together to give a resinous composition. In examples, (1) phthalic anhydride, glycerine, succinic acid, ethylene glycol, rosin and chinawood oil are condensed together giving a resin soluble in acetone, ethyl acetate, furfural, toluol, alcohol or mixtures thereof and which is suitable for coating cloth, paper or cambric. (2) Dammar gum may replace rosin in example (1). (4) Phthalic anhydride, ethylene glycol, rosin and glycerol are heated together and chinawood oil added. To this product is added ethylene glycol and succinic acid and finally glycerine and succinic acid. Specifications 330,895, [Class 2 (iii), Dyes &c.], and 343,624 are referred to. The Specification as open to inspection under Sect. 91 includes an example using linseed oil fatty acids. This subject-matter does not appear in the Specification as accepted. |
