摘要:
The invention relates to an initiator composition and method for anionic polymerisation, comprising at least one alkali metal hydride, selected from LiH, NaH and KH and at least one organoaluminium compound. The invention further relates to a method for anionic polymerisation of styrol or dienyl monomers using said initiator composition.
摘要:
The invention relates to a method for homopolymerization of vinyl-aromatic monomers or copolymerization of vinyl-aromatic monomers or dienes in the presence of at least one alkali metal organyl, at least one magnesium organyl and at least one aluminum organyl. The invention also relates to an initiator composition for implementing the inventive method.
摘要:
A continuous anionic polymerisation or copolymerisation process of styrene or diene monomers with alkali metal alkyl as polymerisation initiator is carried out in the presence of a metal alkyl or aryl of an at least bivalent element as reaction speed regulator, preferably in non-isotherm conditions and without a back admixture in a pipe or pipe bundle reactor. A metal alkyl or aryl A of formula R1M1 and a metal alkyl or aryl B of formula R2nM2 in a molar ratio between B and A from 0.1:1 to 500:1 are used. In the formulas, M1 is Li, Na or K; R1 is hydrogen, C¿1?-C20-alkyl or C6-C20-aryl or C7-C20-alkyl-substituted aryl; M?2¿ is an n-valent element of groups 2a, 2b or 3a of the periodic table of elements; and R2 is hydrogen, halogen, C¿1?-C20-alkyl or C6-C20-alkyl. Also disclosed is a special initiator for the anionic polymerisation which does not contain any Lewis bases.
摘要:
The invention relates to a method for producing homopolymers from oxiranes or copolymers from oxiranes and comonomers, by anionic polymerisation in the presence of an alkali metal compound and an aluminium organyl. The method is characterised in that no crown ether or cryptand is used during the polymerisation process.
摘要:
The invention relates to a method for the production of homopolymers made of α-methylstyrene, or copolymers made of α-methylstyrene and comonomers, by anionic polymerisation in the presence of an initiator composition. The invention is characterised in that the initiator composition contains potassium hydride and at least one aluminium organyl.
摘要:
The invention relates to a method for homopolymerization of vinyl-aromatic monomers or copolymerization of vinyl-aromatic monomers and dienes in the presence of at least one alkali metal compound and at least one compound of an element from Group 3a of the periodic table, wherein the compounds contain, in relation to the sum of molar equivalence of the alkali metal and the elements from Group 3a: a) 0.1 to 3.9 molar equivalents of oxygen, sulfur, nitrogen or phosphorus and b) 0.1 to 3.9 molar equivalents of an organyl ligand.
摘要:
The invention relates to a method for producing homopolymers from oxirans, or copolymers from oxirans and comonomers by anionic polymerisation. Said method is characterised in that the polymerisation takes place in the presence of a quaternary ammonium and/or phosphonium compound and a mononuclear aluminium organyl.
摘要:
The invention relates to a method for the production of homopolymers made of α-methylstyrene, or copolymers made of α-methylstyrene and comonomers, by anionic polymerisation in the presence of an initiator composition. The invention is characterised in that the initiator composition contains potassium hydride and at least one aluminium organyl.
摘要:
The invention relates to a method for producing homopolymers from oxiranes or copolymers from oxiranes and comonomers, by anionic polymerisation in the presence of an alkali metal compound and an aluminium organyl. The method is characterised in that no crown ether or cryptand is used during the polymerisation process.