摘要:
The inventions disclosed herein are catalyst systems comprising a complex having one of the formulas LMX1X2 and LML′ and an activating cocatalyst, and use of the catalyst system in polymerizing olefinic monomers. In either of the foregoing formulas, L is a chelating ligand containing sulfur donors; M is a transition metal selected from either copper, silver, gold, manganese, iron, cobalt, palladium or nickel; X1 and X2 are independently selected from either halides, hydride, triflate, acetate, borate, alkyl, alkoxyl, cycloalkyl, cycloalkoxyl, aryl, thiolate, carbon monoxide, cyanate or olefins; and L′ is a bidentate ligand selected from either dithiolene, dithiolate, diphosphine, bisimine, bispyridine, phenanthroline, oxolate, catecholate, thiolatoamide, thiolatoimine or thiolatophosphine.
摘要翻译:本文公开的发明是包含具有式LMX1X2和LML'之一的络合物和活化助催化剂的催化剂体系,以及催化剂体系在烯烃单体聚合中的用途。 在上述任一式中,L是含硫供体的螯合配体; M是选自铜,银,金,锰,铁,钴,钯或镍的过渡金属; X 1和X 2独立地选自卤化物,氢化物,三氟甲磺酸酯,乙酸酯,硼酸酯,烷基,烷氧基,环烷基,环烷氧基,芳基,硫醇酯,一氧化碳,氰酸酯或烯烃; L'是选自二硫醇,二硫醇盐,二膦,双亚胺,双吡啶,菲咯啉,草酸盐,儿茶酚酸盐,硫醇酰胺,硫醇胺或硫醇化膦的双齿配体。
摘要:
The present invention provides for microporous ceramic materials having a surface area in excess of 70 m.sup.2 /gm and an open microporous cell structure wherein the micropores have a mean width of less than 20 Angstroms and wherein said microporous structure comprises a volume of greater than about 0.03 cm.sup.3 /gm of the ceramic. The invention also provides for a preceramic composite intermediate composition comprising a mixture of a ceramic precursor and nanoscale size metallic particles, whose pyrolysis product in inert atmosphere or in an ammonia atmosphere at temperatures of up to less than about 1100.degree. C. gives rise to the microporous ceramics of the invention. Also provided is a process for the preparation of the microporous ceramics of the invention involving pyrolysis of the composite intermediate under controlled conditions of heating up to temperatures of less than about 1100.degree. C. to form a microporous ceramic product.