| 摘要 |
1,249,567. Paper. SUMITOMO CHEMICAL CO. Ltd. 10 Feb., 1969 [10 Feb., 1968], No. 7130/69. Heading D2B. [Also in Division C3] Water-soluble block copolyamides are obtained by reacting 1 mol. of a C 3-12 aliphatic dicarboxylic acid with 0.8 to 1.2 mols. of a polyalkylene polyamine to form a polyamide which is then reacted with 0.1 to 0.5 mols. of a C 4-19 lactam. The block copolymer may then be reacted with epichlorohydrin, e.g. 1.5 to 2.0 mols. per secondary amine group, to give a cationic thermo-setting resin. Specified reactants are succinic, adipic, azelaic, maleic, fumaric and itaconic acids; di-, tri- or tetra-ethylene tri-, tetra- or penta-amine and dipropylene triamine; pyrrolidone and caprolactam. In Examples block copolyamides are made from diethylene triamine, adipic or itaconic acid, and caprolactam or pyrrolidone and reacted with epichlorohydrin to give aqueous solutions of cationic thermosetting resins of Gardner viscosity A-1 or A-2 and pH 7.5 to 7.8. The cationic resins may be used in paper-making to improve wet-strength and pigment retention and as a drainage aid; they are also stated to be useful as flocculants in treating aqueous waste and for shrink-proofing wool. In Ex. 5 1% of various resins of the invention and comparative cationic resins are included in pulp from which paper is made on a handsheet machine. |
