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公开(公告)号：DE502006003088D1
公开(公告)日：2009-04-23
申请号：DE502006003088
申请日：2006-01-31
Applicant: BASF SE
Inventor： SCHOLZ GUENTER , MOURS MARIAN , LAWRENZ SVEN , PAPENFUSS HORST , BAHR CHRISTOPH , KRECH RUEDIGER
Abstract: The present invention relates to a process for the continuous production of thermoplastically processable polyurethane elastomers, by metering a polyisocyanate (A), a proportion of 1-80 equivalent%, based on the isocyanate group content of the polyisocyanate (A), of a compound (B) having an average of at 1.8-3.0 hydrogen atoms having Zerewitinoff activity, with an average molar mass of 450-5000 g/mol, and a proportion of 12-99 equivalent%, based on the isocyanate group content of the polyisocyanate (A), of a chain extender (C), into a self-cleaning twin-screw extruder whose diameter is 32-62 mm, which is operated at shear rates above 6000 s−1 and residence times of 1-20 seconds, and then bringing the mixture from the self-cleaning twin-screw extruder into a second apparatus in order to complete the reaction.
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公开(公告)号：AT425197T
公开(公告)日：2009-03-15
申请号：AT06707920
申请日：2006-01-31
Applicant: BASF SE
Inventor： SCHOLZ GUENTER , MOURS MARIAN , LAWRENZ SVEN , PAPENFUSS HORST , BAHR CHRISTOPH , KRECH RUEDIGER
Abstract: The present invention relates to a process for the continuous production of thermoplastically processable polyurethane elastomers, by metering a polyisocyanate (A), a proportion of 1-80 equivalent%, based on the isocyanate group content of the polyisocyanate (A), of a compound (B) having an average of at 1.8-3.0 hydrogen atoms having Zerewitinoff activity, with an average molar mass of 450-5000 g/mol, and a proportion of 12-99 equivalent%, based on the isocyanate group content of the polyisocyanate (A), of a chain extender (C), into a self-cleaning twin-screw extruder whose diameter is 32-62 mm, which is operated at shear rates above 6000 s−1 and residence times of 1-20 seconds, and then bringing the mixture from the self-cleaning twin-screw extruder into a second apparatus in order to complete the reaction.
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公开(公告)号：BRPI0618534A2
公开(公告)日：2012-05-08
申请号：BRPI0618534
申请日：2006-11-08
Applicant: BASF SE
Inventor： GUNTHERBERG NORBERT , HOFMANN JUERGEN , WABMER KARL-HEINZ , LOTH WOLFGANG , SCHIERHOLZ JEANS-UWE , SCHMAUS PAULUS , MOURS MARIAN , SCHADE CHRISTIAN , ITTEMANN PETER , HEINEN HARTMUT , CZAUDERNA BERNHARD , SAUER MICHAEL , BARDON RAINER , KRUEGER MARCO
Abstract: The invention relates to a tube bundle heat exchanger (R) for removing dissolved substances from a polymer solution (P) by degassing, having a bundle of tubes (R) which are arranged parallel to one another and vertically and are fastened at both ends in each case in one tube plate (B), and having a degassing region below the lower tube plate (B), having an insert (1) in each tube (R), which insert (1) narrows the free throughflow cross section through the tube (R), and wherein the polymer solution (P) is supplied into the tubes (R) in a single-phase liquid state, and having a casing space around the tubes (R) which is traversed by a heat carrier, wherein the degassing takes place by means of a pressure drop between the inlet pressure of the polymer solution (P) in the tube bundle heat exchanger (R) and the degassing region, characterized in that each insert (1) is designed in such a way as to generate a pressure step between the inlet pressure and the pressure in the degassing region, by means of which pressure step a predefined low residual content of dissolved substances is obtained in the degassed polymer, and an additional heat input which is necessary for this purpose takes place via the heat carrier into the single-phase liquid polymer solution (P).
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公开(公告)号：ES2322194T3
公开(公告)日：2009-06-17
申请号：ES06707920
申请日：2006-01-31
Applicant: BASF SE
Inventor： SCHOLZ GUNTER , MOURS MARIAN , LAWRENZ SVEN , PAPENFUSS HORST , BAHR CHRISTOPH , KRECH RUDIGER
Abstract: Procedimiento para la obtención en continuo de elastómeros de poliuretano, que pueden ser transformados en estado termoplástico, según el cual se dosifican en una extrusora de dos árboles, autolimpiadora - un poliisocianato (A), - un compuesto (B) con, en promedio, al menos 1,8 y, como máximo, 3,0 átomos de hidrógeno con actividad de Zerewitinoff, con un peso molecular medio comprendido entre 450 g/mol y 5.000 g/mol, en una proporción comprendida entre 1 y 80% equivalente, referido al contenido en grupos isocianato del poliisocianato (A), - un prolongador de cadenas (C) con, en promedio, al menos 1,8 y, como máximo, 3,0 átomos de hidrógeno con actividad de Zerewitinoff por molécula, con un peso molecular promedio en número comprendido entre 60 g/mol y 400 g/mol, en una proporción comprendida entre un 12 y un 99% equivalente, referido al contenido en grupos isocianato del poliisocianato (A), - desde 0 hasta un 30% en peso de catalizadores, referido a la cantidad total del elastómero de poliuretano así como con otros productos auxiliares y aditivos (D), en una relación molar NCO:OH comprendida entre 0,9:1 y 1,2:1 del poliisocianato (A) con respecto a la suma formada por el compuesto (B), el prolongador de cadenas (C) y los otros productos auxiliares y aditivos (D), cuya extrusora se hace trabajar a elevadas velocidades de cizallamiento y la mezcla se transfiere a continuación desde la extrusora con dos árboles, autolimpiadora, hasta otro aparato para concluir la reacción, caracterizado porque se ajustan en la extrusora de dos árboles, autolimpiadora, velocidades de cizallamiento situadas por encima de los 6.000 s-1 y tiempos de residencia situados en el intervalo comprendido entre 1 y 20 segundos.
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