公开(公告)号：US5198518A

公开(公告)日：1993-03-30

申请号：US791673

申请日：1991-11-14

申请人： Kenji Yamamoto ,  Ken-Ichi Isobe

发明人： Kenji Yamamoto ,  Ken-Ichi Isobe

IPC分类号： C08G77/06 ,  C08G77/22 ,  C08G77/34 ,  C08G77/38

CPC分类号： C08G77/06

摘要： Polyorganosiloxane resins are prepared through the hydrolytic condensation of organoalkoxysilanes and/or oligomers thereof. By adding a low volatile, weakly acidic compound to the reaction mixture for adjusting the reaction mixture to pH 2-5, the alcohol by-product can be distilled off from the reaction mixture without altering the polyorganosiloxane resins.

摘要翻译： 聚有机硅氧烷树脂通过有机烷氧基硅烷和/或其低聚物的水解缩合制备。 通过向反应混合物中加入低挥发性弱酸性化合物以将反应混合物调节至pH 2-5，可以从反应混合物中蒸馏出醇副产物，而不改变聚有机硅氧烷树脂。

公开(公告)号：US5070175A

公开(公告)日：1991-12-03

申请号：US706148

申请日：1991-05-28

申请人： Hiroshi Tsumura ,  Kiyoyuki Mutoh ,  Kazushi Satoh ,  Ken-ichi Isobe

发明人： Hiroshi Tsumura ,  Kiyoyuki Mutoh ,  Kazushi Satoh ,  Ken-ichi Isobe

IPC分类号： C08G77/02 ,  C08G77/06 ,  C08G77/08

CPC分类号： C08G77/08 ,  C08G77/06

摘要： An efficient and economically advantageous method is proposed for the preparation of an organopolysiloxane comprising tetrafunctional siloxane units, i.e. Q units, and, typically, monofunctional siloxy units, i.e. M units, and useful as a reinforcing agent in silicone rubbers. The method comprises the steps of: mixing the reactants for providing the Q and M units, such as ethyl orthosilicate and trimethyl methoxy silane, in a desired molar ratio; and heating the mixture at a temperature higher by at least 10.degree. C. than the boiling point of the mixture under normal pressure in a closed vessel in the presence of water and a catalyst such as a sulfonic acid group-containing compound. In addition to the greatly shortened reaction time and remarkably decreased contents of residual alkoxy groups and gelled matter in the product, the method is advantageous also in respect of the absence of the problems caused by the disposal of the waste water as well as the corrosiveness of hydrogen chloride unavoidably produced in the conventional prior art methods.

摘要翻译： 提出了一种有效和经济上有利的方法，用于制备包含四官能硅氧烷单元即Q单元的有机聚硅氧烷，通常为单官能甲硅烷氧基单元，即M单元，并且可用作硅橡胶中的增强剂。 该方法包括以下步骤：以所需的摩尔比混合反应物以提供Q和M单元，如原硅酸乙酯和三甲基甲氧基硅烷; 并且在水和催化剂如含磺酸基化合物的存在下，在密闭容器中，在常压下，比混合物的沸点高至少10℃的温度加热该混合物。 除了反应时间大大缩短，产物中残留的烷氧基和凝胶物含量显着降低之外，该方法在废水处理不存在的问题以及废水处理的腐蚀性方面也是有利的 在常规现有技术方法中不可避免地产生氯化氢。

公开(公告)号：US5241033A

公开(公告)日：1993-08-31

申请号：US805522

申请日：1991-12-13

申请人： Hiroshi Tsumura ,  Kiyoyuki Mutoh ,  Kazushi Satoh ,  Ken-ichi Isobe

发明人： Hiroshi Tsumura ,  Kiyoyuki Mutoh ,  Kazushi Satoh ,  Ken-ichi Isobe

IPC分类号： C08G77/06 ,  C08G77/08 ,  C08G77/22 ,  C08G77/32

CPC分类号： C08G77/08

摘要： A novel and efficient method is disclosed for decreasing the content of residual alkoxy groups in an organopolysiloxane such as so-called MQ resins, usually and unavoidably, having a considerable amount of residual alkoxy groups bonded to the silicon atoms to be very detrimental against practical application of the organopolysiloxane. The method comprises admixing the alkoxy-containing organopolysiloxane with a strongly alkaline compound such as alkali metal hydroxides as a catalyst, an aprotic polar solvent such as N,N-dimethyl formamide, dimethyl sulfoxide and the like and water each in a specified amount and heating the mixture, for example, under reflux so that the alkoxy groups are rapidly hydrolyzed and can be removed in the form of an alcohol.

摘要翻译： 公开了一种用于降低有机聚硅氧烷（例如所谓的MQ树脂）中残留的烷氧基的含量的新型和有效的方法，所述MQ树脂通常并且不可避免地具有与硅原子键合的相当量的残余烷氧基对实际应用非常有害 的有机聚硅氧烷。 该方法包括将含烷氧基的有机聚硅氧烷与强碱性化合物如碱金属氢氧化物作为催化剂，非质子极性溶剂如N，N-二甲基甲酰胺，二甲基亚砜等和各自以规定量加热并加热 混合物例如在回流下使得烷氧基被快速水解并且可以以醇的形式除去。