摘要:
A process for photocatalytic polymerisation of a cyclic olefin or of at least two different cyclic olefins in the presence of a metal compound as catalyst, which process comprises carrying out a photochemically induced ring-opening metathesis polymerisation in the presence of a catalytic amount of at least one thermostable molybdenum (VI) or tungsten (VI) compound which contains at least two methyl groups or two monosubstituted methyl groups lacking .beta.-hydrogen atoms in the substituent and which are bonded to the metal atom. The process may be carried out by first irradiating and terminating the polymerisation by heating. The process is suitable for fabricating moulded articles, coatings and relief images.
摘要:
A mixture of at least one thermal carbene-free ruthenium catalyst A and at least one thermal ruthenium carbene catalyst B, both of which initiate the ring-opening metathesis polymerization on their own, said catalysts being present in a weight ratio of A to B from 10:1 to 1:10. By adding this mixture even in small amounts, the ring-opening metathesis polymerization of strained cycloolefins can be effectively catalyzed.
摘要:
Process for the photocatalytic polymerization of a cyclical olefin or at least two different cyclical olefins in the presence of a metal compound as the catalyst, which is characterized in that a photochemical ring-opening metathesis polymerization is carried out in the presence of a catalytic amount of at least one carbene-free, bivalent-cationic ruthenium or osmium compound which contains at least one phosphine group, at least one photolabile ligand, and optionally neutral ligands bonded to the metal atom, a total of 2 or 3 ligands being bonded, and which contains acid ions for balancing the charge. The process can also be carried out by first carrying out the irradiation and ending the polymerization by heating. The process is suitable, for example, for the preparation of thermoplastics shaping compounds and the production of coatings and images in relief.
摘要:
Composition of (a) at least one strained cycloolefin and (b) a catalytic quantity of at least one divalent-cationic compound of ruthenium or osmium with a metal atom, to which are bound 1 to 3 tertiary phosphine ligands with, in the case of the ruthenium compounds, sterically exacting substituents, optionally non-photolabile neutral ligands and anions for charge balancing, with the proviso that in ruthenium (trisphenylphosphine)dihalides or hydride-halides the phenyl groups are substituted by C.sub.1 -C.sub.18 alkyl, C.sub.1 -C.sub.18 haloalkyl or C.sub.1 -C.sub.18 alkoxy. The composition is suitable for the production of molded parts of all kinds and of coatings.
摘要:
Process for the photocatalytic polymerization of a cyclical olefin or at least two different cyclical olefins in the presence of a metal compound as the catalyst, in which a photochemical ring-opening metathesis polymerization is carried out in the presence of a catalytic amount of at least one heat-stable titanium(IV), niobium(V), tantalum(V), molybdenum(VI) or tungsten(VI) compound in which a silylmethyl group and at least one halogen are bonded to the metal. The process can also be carried out by first performing the irradiation and ending the polymerization by heating. The process is suitable, for example, for the production of thermoplastic shaping compounds, coatings and images in relief.
摘要:
Hexacoordinated ruthenium and osmium catalysts of the formulae ##STR1## in which M and M' independently of one another are ruthenium or osmium;X, X', Y and Y' independently of one another are anionic ligands, or X and Y and X' and Y' in each case together are bis-anionic ligandsL.sup.1 and L.sup.1' independently of one another are tertiary phosphine;L.sup.2 and L.sup.3 independently of one another are a monodentate ligand, or L.sup.2 and L.sup.3 together are bidentate, neutral electron donor ligands;L.sup.4 is tetradentate, neutral electron donor ligand;L.sup.5 is a bidentate, neutral electron donor ligand; andT and T' indepedently of one another are H or organic substituents, are useful for the synthesis of custom-tailored polymers and for the ring-closing metathesis of olefins.
摘要:
Compositions comprising at least one nonvolatile acetylene alone or together with a strained cycloolefin and catalytic amounts of a catalyst for metathesis polymerization, which comprise at least one one-component catalyst from the group molybdenum compounds, tungsten compounds, niobium compounds and tantalum compounds which comprise (a) either at least two methyl groups or two monosubstituted methyl groups without .alpha. hydrogen atoms in the substituent or (b) at least one halogen and only one silylmethyl group attached to the metal. The storage-stable compositions can be polymerized by the action of actinic radiation or by short-term irradiation and subsequent thermal curing. The polymers can be used to prepare shaped articles, films, coatings and relief images.
摘要:
A catalyst system for the ring-opening matathesis polymerization, which consists of at least two components (a) and (b), wherein(a) is a ruthenium compound of formula I or IIRuX.sub.2 (L.sub.1).sub.m (L.sub.2).sub.n (L.sub.3).sub.o (L.sub.4).sub.p (I),ARuX.sub.2 (L.sub.1).sub.r L.sub.2).sub.3 (II),wherein L.sub.1,L.sub.2, L.sub.3 and L.sub.4 are each independently of the other C.sub.1 -C.sub.18 alkylcyanide, C.sub.6 -C.sub.24 - aralkylcyanide, tertiary amine, tertiary phosphine which does not contain any secondary alkyl or cycloalkyl radicals bound to the phosphorus atom, or phosphite, X is halogen, A is arene, m, n, o and p are integers from 0 to 4, where 2.ltoreq.m+n+o+p.ltoreq.4, r and s are integers from 0 to 2, where 1.ltoreq.r+s.ltoreq.2, and(b) is a tertiary phosphine containing at least one secondary alkyl radical or cycloalkyl radical bound to the phosphorus atom,is particularly suitable for the polymerisation of strained cycloolefins by the RIM process.
摘要翻译:一种用于开环易位聚合的催化剂体系,其由至少两种组分(a)和(b)组成,其中(a)是式I或IIRuX 2(L1)m(L2)n(L3)的钌化合物, 其中L 1,L 2,L 3和L 4各自独立地为C 1 -C 18烷基氰化物,C 6 -C 24 - 芳烷基氰化物,叔胺,叔膦,其中,(L)p(I),ARuX2(L1) 不包含与磷原子结合的任何仲烷基或环烷基,或亚磷酸酯,X是卤素,A是芳烃,m,n,o和p是0至4的整数,其中2≤m+ n + o + p = 4,r和s是0至2的整数,其中1 r + s 2,(b)是含有至少一个仲烷基或环烷基的叔膦, 磷原子特别适用于通过RIM工艺聚合应变的环烯烃。
摘要:
Compounds of the formula I(A).sub.n --B (I)in which A is the radical of a strained cycloolefin, B is a direct bond or an n-valent bridging group and n is an integer from 2 to 8, with the exception of 1,2-bisnorbornenyl-ethane and norbornenecarboxylic acid norbornenemethyl ester. The compounds of the formula I can be polymerized with one-component catalysts (ring-opening metathesis polymerization).
摘要:
A process for the preparation of a metal carbene, in which a metal salt is first reacted in the presence of a base and a secondary or tertiary alcohol with a tertiary phosphine or phosphite or a ditertiary diphosphine or diphosphite and then reacted in the presence of an acid with an alkyne and, if desired, an alkene.