摘要:
Catalyst systems for the copolymerization of carbon monoxide and null-olefinically unsaturated compounds contain, as essential components, a) a metal complex of the formula (I) 1 nullwhere R1 to R4 are each linear or branched C2- to C28-alkyl, C3- to C14-cycloalkyl or alkylaryl where the alkyl moiety is of 1 to 28 carbon atoms and the aryl moiety is of 6 to 15 carbon atoms, each of which is substituted by at least one polar protic or ionic functional group based on elements of groups IVA to VIA of the Periodic Table of Elements, and b) if required, one or more Lewis or protic acids or a mixture of Lewis and protic acids.
摘要:
The invention relates to a method of producing aqueous copolymer dispersions from copolymers that comprise carbon monoxide and at least one olefinically unsaturated compound.
摘要:
Water-soluble transition metal complexes of the formula (I) where R1 to R4 are linear or branched C2- to C28-alkyl, C3- to C14-cycloalkyl or alkylaryl where the alkyl moiety is of 1 to 28 carbon atoms and the aryl moiety is of 6 to 15 carbon atoms, each of which is substituted by at least one polar protic or ionic functional group based on nonmetallic elements of groups IVA to VIA of the Periodic Table of Elements.
摘要:
The present invention is based upon the discovery that nontitanyl oxalates can enhance the catalytic functionality of titanyl oxalate catalysts. This invention provides a novel catalytic composition containing a titanyl oxalate catalyst and a metallic oxalate catalyst enhancer and optionally containing a metallic cocatalyst such as an antimony based catalyst. A synergistic relationship has been discovered between titanyl oxalate catalyst and the catalyst enhancer. A synergistic relationship has also been discovered between the titanyl oxalate catalyst, catalyst enhancer and a metallic cocatalyst such as antimony oxide or antimony triacetate. Also provided is an improved process of producing polyester by the polycondensation of polyester forming reactants in the presence of a catalytically effective amount of a polycondensation catalyst, wherein the improvement comprises utilizing, as the polycondensation catalyst, the novel catalyst composition containing a titanyl oxalate such as lithium titanyl oxalate and a catalyst enhancer such as a nontitanyl metallic oxalate like lithium oxalate and optionally containing a metallic catalyst such as antimony oxide or antimony triacetate. The improved process produces an improved polyester having lower acetaldehyde numbers and good color. The titanyl oxalate/catalyst enhancer composition can be used as a polycondensation catalyst in combination with other catalysts to achieve synergistic catalytic activity. Preferred is a combination of lithium or potassium titanyl oxalate, Li2 or K2TiO(C2O4)2, lithium or potassium oxalate, Li2 or K2(C2O4)2 with antimony oxide or antimony triacetate or antimony trisglycoxide.
摘要翻译:本发明基于以下发现,即草酸钛酸酯可以增强草酸氧钛催化剂的催化功能。 本发明提供一种含有草酸氧钛催化剂和金属草酸盐催化剂增强剂并任选地含有金属助催化剂如锑基催化剂的新型催化组合物。 在草酸氧钛催化剂和催化剂增强剂之间已经发现协同关系。 在草酸氧钛催化剂,催化剂增强剂和金属助催化剂如氧化锑或三乙酸锑之间也发现了协同关系。 还提供了通过在催化有效量的缩聚催化剂存在下,通过聚酯形成反应物的缩聚来生产聚酯的改进方法,其中改进包括利用含有草酸氧钛的新型催化剂组合物作为缩聚催化剂, 草酸氧钛酸锂和催化剂增强剂如非钛酸金属草酸盐如草酸锂,并任选地含有金属催化剂如氧化锑或三乙酸锑。 改进的方法产生具有较低乙醛数和良好颜色的改进的聚酯。 草酸氧钛/催化剂增强剂组合物可以与其它催化剂组合用作缩聚催化剂以实现协同催化活性。 优选的是草酸锂或钾钛酸盐,Li 2或K 2 TiO(C 2 O 4)2,草酸锂或钾,Li 2或K 2(C 2 O 4)2与氧化锑或三乙酸锑或三羟基氧化锑的组合。
摘要:
The present invention relates to a process for preparing a catalyst by activating a catalytic composition which comprises a) at least one metal of group IB or IIB or a compound thereof, b) where appropriate a carrier which comprises treating the composition with an alkyne of the general formula I R1—C≡C—R2 (I) in which R1 is alkyl, cycloalkyl, aryl, hydroxyalkyl, haloalkyl, alkoxy or alkoxyalkyl, R2 is a hydrogen atom, alkyl, cycloalkyl or aryl, and a carbonyl compound of the general formula II in which R3 and R4 are, independently of one another, a hydrogen atom, alkyl, haloalkyl, cycloalkyl or aryl, to catalysts obtainable by this process, and to alkynylations and aminoalkylations employing these catalysts.
摘要:
Nickel acetyl acetonate catalysts used in the manufacture of polyurethanes and particularly polyurathane foam, is replaced with a more environmentally friendly organo-metallic catalyst, specifically other metal acetyl acetonates such as iron or copper. In accordance with an important feature of this invention, in addition to the metal acetyl acetonate, the catalyst system also includes acetyl acetone. The acetyl acetone acts as a delay mechanism to delay the catalytic action of the metal acetyl acetonate which is normally highly catalytic at relatively low temperatures. It will be appreciated that high catalytic activity at relatively low temperature will lead to deleterious premature cure. By adding acetyl acetone into the catalyst system, the acetyl acetone acts to delay and/or slow the catalytic action of the metal acetyl acetonate until the polyurethane is heated at which point the acetyl acetone is driven off and the metal acetyl acetonate then provides a relatively fast cure at the elevated temperature.
摘要:
A process for the preparation of methyl formate by reacting methanol and carbon monoxide in the presence of an alkali metal alcoholate or alkaline earth metal alcoholate at from 30.degree. to 150.degree. C. and from 50 to 300 bar, wherein a nonionic complexing agent is used to bind the alkali metal cations or alkaline earth metal cations.
摘要:
A process for oligomerizing ethylene using a bicomponent catalyst comprising a nickel ylide substituted with a sulfonato group and an alkyl aluminum alkoxide.
摘要:
A multi-component catalyst system that is latent at a first elevated temperature but is rapidly activated at a second temperature only slightly elevated over the first temperature comprises 1) metal salts of fluoroalkane sulfonic acids or bis(fluoroalkylsulfonyl)methanes, and 2) a thermally decomposable ester reaction product of a tertiary alkyl alcohol and an acid that forms a chelation complex with the metal ion of the metal salt. In some embodiments the catalyst system further includes a buffering compound that retards activity of the catalyst system.
摘要:
Provided is an efficient technology for synthesizing diamino acids (diamino acid derivatives). Disclosed is a manufacturing method for diamino acid derivatives wherein the fluorenyl groups of the diamino acid derivative starting materials represented by General Formula [II] or [IV] are removed.