Organic polymer containing reactive silicon group
View Patent ↗The present invention provides a solution to a problem that a composition including a reactive silicon group-containing polyether undergoes red coloration. More specifically, in a reactive silicon group-containing organic polymer which contains Co, the problem concerned is solved by limiting the Co content to 0.5 ppm or less. As the reactive silicon group-containing organic polymer, for example, a reactive silicon group-containing polyether (A) or a mixture of the reactive silicon group-containing polyether (A) and a vinyl polymer (B) may be cited. The reactive silicon group-containing polyether (A) is obtained, for example, by reacting a polyether or a derivative thereof which contains Co in a content of 0.5 ppm or less with a silane compound which has a group capable of reacting with the polyether or the derivative thereof and has a hydrolyzable group.
1. A process for producing an organic polymer composition which comprises Co in a content of 0.05 to 0.5 ppm, and comprised of a mixture of a reactive silicon group-containing polyether (A) and a vinyl polymer (B) which is obtained by polymerizing a vinyl monomer in the presence of a mercapto group-containing compound as a chain transfer agent, wherein in the preparation of the recited silicon group-containing polyether, the Co is present as a residue of a cobalt polymerization catalyst employed during the producing of component (A) and a purification step comprised of the following (a) is employed,
wherein (a) comprises adding, to a reaction mixture containing an allyl-terminated polymer, hexane and water to extract ionic impurities into a water layer, then separating and removing the water layer, and then concentrating and subjecting the hexane layer to a volatilization under reduced pressure to yield a purified allyl-terminated polyether.
2. A process for producing an organic polymer composition, which comprises Co in a content of 0.05 to 0.5 ppm, and comprised of a mixture of a reactive silicon group-containing polyether (A) and a vinyl polymer (B) which is obtained by polymerizing a vinyl monomer in the presence of a mercapto group-containing compound as a chain transfer agent, wherein in the preparation of the recited silicon group-containing polyether, a purification step comprises treating a reaction mixture containing a hydroxyl group-terminated polyether and a catalyst with a strong alkali, then neutralizing the reaction mixture, and then purifying the reaction mixture by filtration.