coordinated anionic polymerization using nickel or other transition metals a telomerization using radical initiators and a thermal polymerization most preferred amongst the above conjugated diolefin polymers is a butadiene polymer containing more than 50 percent of 1 2 double bonds certain derivatives of the polymers are also eligible for the purpose of the invention such derivatives have in their polymers an acid group an epoxy group a hydroxyl group an amino group and a mercapto group specific examples are polymers added with acrylic groups and maleic acid anhydride or polymers which are epoxidized or which are epoxidized and then reacted with an amine or a mercaptan the conjugated diolefin polymers or their derivatives used in the invention may vary widely in the number average molecular weight between 300 and 50 000 but preferably between 500 and 5 000 lower molecular weights would result in reduced deposit strength of the polymer with respect to the solid carrier and hence in reduced service life of the resulting adsorbent higher molecular weights would make the polymer difficult to be dissolved in solvents and would lead to considerable difficulty in its deposit operation due to too viscous solution the term porous solid carrier as used herein includes porous materials having a specific surface area of greater than 10 m 2 per gram normally above 50 m 2 per gram and preferably greater than 100 m 2 per gram examples of such porous solid material include inorganic compounds such as alumina silica gel silicic acid alumina silicate crystalline aluminosilicate clay.