Method for preparing polyorganosiloxanes (pos) by polycondensation/redistribution of oligosiloxanes in the presence of a strong base and strong bases used
申请人:Baceiredo Antoire
公开号:US20050080215A1
公开(公告)日:2005-04-14
The invention concerns the synthesis of silicone by anionic polymerisation of cyclic organosiloxane oligomers in the presence of a slightly nucleophilic strong base. The invention aims at providing novel strong base catalysts, more efficient in terms of solubility in the silicones, with hydrolysis stability strength and polymerising capacity. To achieve this, the invention provides for the use of ylides derived from aminophosphonium such as for example that of formula: [Me3N)3P—CHMe2]+, MeO or derived from phosphoranylidenes such as that of formula: [Me3P—HC=Pme3]+, t-BuO. The invention also concerns strong base catalysts as novel products.
本发明涉及在微弱亲核强碱的存在下通过环状有机硅氧烷低聚物的阴离子聚合来合成硅。该发明旨在提供新型的强碱催化剂,其在硅烷中的溶解度更高、具有水解稳定性和聚合能力更强。为达到此目的,本发明提供了从氨基膦盐衍生的叶立德,例如式[Me3N)3P—CHMe2]+,MeO或从膦烯衍生的叶立德,例如式[Me3P—HC=Pme3]+,t-BuO的使用。本发明还涉及作为新型产品的强碱催化剂。