| 摘要 |
PURPOSE:To produce a highly hydrogenated polymer in high yield, by hydrogenating a hydroxyl group-containing diene polymer, treating a solution of the reaction product with an alcohol and hydrogenating the prepared dark solution. CONSTITUTION:A diene polymer [e.g., butadiene polymer, chloroprene polymer, etc., shown by the formula (R is H, Cl or CH3; n is 5-300), etc.,] containing hydroxyl groups preferably at both molecular ends is catalytically hydrolyzed in a solvent such as pentane, cyclohexane, etc., usually by the use of a catalyst of Ni, Pd, etc., supported on a carrier such as silica, alumina, etc., preferably at 100-200 deg.C at 30-100kg/cm<2>G for 5-10hr and a solution of the hydrogenation product is treated with an alcohol such as isopropyl alcohol to give two layers. A dark solution containing a low hydrogenated polymer, an unhydrogenated polymer and the catalyst, a lower layer of the separated two layers, is hydrogenated again and added to a bright solution, a highly hydrogenated polymer solution at the upper layer.
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