发明名称 |
Process for the purification of a polycarbodiimide |
摘要 |
A process for purifying a polycarbodiimide comprising (a) providing a mixture comprising a polycarbodiimide and a carbodiimidization catalyst; (b) separating carbodiimidization catalyst from the polycarbodiimide by subjecting the mixture according to (a) to a first distillation, (c) adding an entrainer to the first bottom product obtained from (b) to obtain a mixture; (d) further separating carbodiimidization catalyst from the polycarbodiimide by subjecting the mixture obtained from (c) to a second distillation. |
申请公布号 |
US9481641(B2) |
申请公布日期 |
2016.11.01 |
申请号 |
US201314429151 |
申请日期 |
2013.09.19 |
申请人 |
BASF SE |
发明人 |
Haeberle Karl;Hechavarria Fonseca Maria Teresa;Rehling Lars;Schaefer Frank;Ahmadnian Fatemeh;Bollmann Heinrich;Bubolz Markus;Buschmann Carsten;Scholz Guenter;Thomas Maria |
分类号 |
C07C267/00;C08G73/00;C08G69/00;C08G18/48;C08G18/65;C08G18/67;C08G18/32 |
主分类号 |
C07C267/00 |
代理机构 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
代理人 |
Oblon, McClelland, Maier & Neustadt, L.L.P. |
主权项 |
1. A process for purifying a polycarbodiimide, comprising:
(a) separating a carbodiimidization catalyst from an initial mixture comprising a polycarbodiimide and the carbodiimidization catalyst by subjecting the initial mixture to a first distillation, wherein a first bottom product and a first top product are obtained, wherein the first bottom product comprises the polycarbodiimide and carbodiimidization catalyst, a weight ratio of carbodiimidization catalyst relative to polycarbodiimide in the first bottom product is lower than a weight ratio of carbodiimidization catalyst relative to polycarbodiimide in the initial mixture and wherein the first top product comprises carbodiimidization catalyst; (b) adding an entrainer to the first bottom product obtained from (a) to obtain an intermediate mixture, wherein the entrainer has a boiling point which is lower than the boiling point of the polycarbodiimide; (c) further separating carbodiimidization catalyst from the polycarbodiimide by subjecting the intermediate mixture obtained from the adding (b) to a second distillation, wherein a second bottom product and a second top product are obtained, wherein the second bottom product comprises the polycarbodiimide and carbodiimidization catalyst, a weight ratio of carbodiimidization catalyst relative to polycarbodiimide in the second bottom product is lower than a weight ratio of carbodiimidization catalyst relative to polycarbodiimide in the first bottom product obtained from the separating (a), and wherein the second top product comprises carbodiimidization catalyst and entrainer. |
地址 |
Ludwigshafen DE |